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============================================================================ OCR V1.3 (August 1994) Optical Character Recognition for the Atari ST/STe/TT and Falcon by: Alexander Clauss Stresemannstra₧e 44 64297 Darmstadt Germany ---------------------------------------------------------------------------- OCR is FREEWARE. It may be copied and used freely. Distribution by BBSs and PD libraries is allowed. However, OCR may NOT under ANY circumstances be included in CD-ROM collections or on magazine cover disks without my prior written permission. OCR and its documentation must always remain together and complete with all its files and documentation. Changes to the program and documentation is forbidden. If you like OCR and use it regularly, you should send the author a (voluntary) donation. 20-30 DM seems reasonable but even if you don't send me any money at least send me a postcard or Email so I know whether any interest in OCR exists... New versions are available directly from the author (please include disk, self addressed envelope and an international reply coupon to cover the return postage or you won't get a reply). Alternatively you download the latest release version from various FTP servers, try: ftp.uni-kl.de (/pub/atari/misc) or ftp.isbiel.ch (atari/diverses)) If you'd like to be informed when a new version is released you can either send me your Email address or a SAE or postcard and I'll let you know by snailmail... OCR UK support and update service ============================================================================ OCR is Freeware. If you like the program and use it regularly you should contribute a voluntary donation. Between £8-12 is reasonable but even a postcard or Email with feedback is better than nothing. Users who would like to make a voluntary contribution in the UK should: a) Make a cheque for payable to J. Connor for any amount b) Be sure to include your name and address. c) Send cheque to UK Address below Joe Connor, 65 Mill Road, Colchester, CO4 5LJ, England Email: jconnor@cix.compulink.co.uk The UK support scheme does NOT make any profit. A small part of your contribution is retained to cover the stationary, media, currency and postage costs incurred running the scheme. Why you should contribute ------------------------- The best reason for contributing is to support and encourage future English versions and support for OCR. You'll also receive a Master disk containing the latest version and access to the free update service. UK users who have contributed to OCR can obtain the latest English Version from Joe Connor at any time, free of charge, by sending a Stamped Addressed Envelope enclosing an unlabelled floppy disk. Important! I'm naturally interested to receive bug reports messages and/or suggestions for improvements. If you want to report a bug please always include the following details: computer type, TOS version, Auto folder programs and Accessories. I'm particularly interested in constructive criticism and suggestions for future versions! Contact ---------------------------------------------------------------------------- Alexander Clauss Stresemannstra₧e 44 D-64297 Darmstadt Germany Email: aclauss@rbg.informatik.th-darmstadt.de (If you don't get a reply from this Email address try the snailmail address). Bank details ---------------------------------------------------------------------------- Sparkasse Darmstadt Sort code: 508 501 50 Account number: 0115032143 Please indicate your address on the transfer and state 'OCR & Version number' as reason for transfer. English translation ----------------------------------------------------------------------------- Stefan Damerau Bergholm 31 D-24857 Fahrdorf Email: Stefan_Damerau@sl.maus.de !!!!!!!!!!!!!!!!!!!!!!IMPORTANT: MESSAGE LIMIT: 16kB!!!!!!!!!!!!!!!!!!!!!! Edited by Joe Connor. Email at: jconnor@cix.compulink.co.uk ============================================================================ System requirements ---------------------------------------------------------------------------- This program runs on all Atari ST/STe/TT and Falcon computers. OCR functions at any resolution above 496x200. 500 Kb RAM storage is sufficent but working with scanned images needs a lot of memory, the more RAM the better as usual! Naturally you'll also need a scanner. Brief Overview -------------- The program can recognise text in scanned images and save the text in ASCII, which can be further processed using your favourite text editor. Correction arrangements can be defined to assist with difficult to recognise characters etc. Individual databases can be created for each font. There's a seperate mode to handle images from drawing packages where the texts were written using the system and/or GDOS fonts which takes much less computer time. ============================================================================ OCR functions ---------------------------------------------------------------------------- Most menu options can also be selected using keyboard shortcuts. The corresponding shortcuts are indicated in brackets. Starting OCR ============ When starting OCR from the command line using filenames these files will be automatically loaded. The following extensions are supported: - *.IMG (Images) - *.LIB (Character set databases) - *.KOR (Correction setups) More than one filename can be entered, but only one of each type will be loaded. If there's more than one of a type the one with the latest time/date stamp will be loaded. MultiTOS Drag & drop -------------------- Under MultiTOS any *.IMG, *.LIB or *.KOR files can be dragged from any desktop window to an OCR window and they will be loaded. Dialogs ------- All the dialogs can optionally be displayed in windows to avoid blocking other processes when multitasking. Single tasking users should continue to use normal dialogs as they are slightly faster. All buttons are selectable using keyboard shortcuts. [Return] or [Enter] selects 'OK', [Undo] selects 'Cancel'. All other buttons can be selected by holding down the [Alternate] key and pressing the underscored character. Pressing the [Insert] key inside any editable field invokes a dialog box containing the entire Atari character set. Any desired character can be selected using the mouse. This provides an easy method of accessing characters not normally avaialalble from the keyboard. To move any non-windowed dialog click and drag (anywhere on the dialog background) using the mouse. Hold down the [Shift] key at the same time and the dialog turns invisible (apart from its border) which is handy if you need to read the contents of the screen underneath the dialog. Windows ------- The following keyboard entries are available: [Control]+U Close top window [Control]+* Toggle between full screen and original window size [Control]+W Cycle through the open windows Cursor keys; the contents of the topmost window is scrolled a line at a time in the corresponding direction. [Shift] + Cursor keys; the contents of the topmost window is scrolled a screen at a time in the corresponding direction. When positioning the mouse above the upper window, this window can be scrolled by holding down the RIGHT Mouse button and moving the mouse. Holding down either [Shift] key increases the scrolling speed. Image windows ------------- The scanned image is displayed in an image window. Because scanned images are often very large it's possible to display the image at a reduced size, 50%, 25%, 12.5% etc. Refer to 'Image size' for more details. Marking block; using a click and drag action the mouse can be used to mark a block inside an Image window. If the block was not perfectly defined fist time round it can easily be repositioned by dragging one of the eight grab handles. Deleting blocks (Cut block) [Control]+X; use this option to remove unwanted lines or other distractions which cannot be recognized as text. Multi-column text can be processed by individually marking each column for recognition. Text windows ------------ After recognition text is output to this window. Marking block; using a click and drag action the mouse can be used to mark a block consisting of complete lines inside the text window which are displayed in inverse video. The start/end line of the block can be adjusted by holding down either [Shift] key and clicking to mark the new block start/end line. Cut block [Control]+X; the marked block is moved to the clipboard and removed from the text window. Copy block [Control]+C; the marked block is copied to the clipboard for use by another application which supports the Atari Clipboard. Paste block [Control]+V; pastes an IMG format file into the Image window. ============================================================================ The OCR drop down menus ---------------------------------------------------------------------------- ^ = [Control] key A = [Alternate] key S = [Shift] key OCR | File | Edit | Options | ---------------------------------------------------------------------------| About OCR.. | Load image... ^Q | Mark all ^A | Help HELP | ------------| Save image... S^S | Remove block mark S^A |------------------| Accessories | Scan image... ^R |-----------------------| Recognition.. AO | (and other |-------------------| Cut ^X | Font... AF | Tasks) | Save ASCII... AS | Copy ^C | Edit font... AE | ------------| Delete ASCII... | Paste ^V | Corrections.. AC | |-------------------|-----------------------|------------------| | Load font... AR | Image size... > | General... AA | | Save font... AW | Align picture... > |------------------| | Delete font... |-----------------------| Save Options | |-------------------| Open text window ^T |------------------| | Quit ^Q |-----------------------| |-------------------| Start recognition F1 | | Resume recognition F2 | | Break recognition ESC | |-----------------------| Submenus (Falcon & MTOS only!) * Image size + Align Picture |---------| |----------------| | 100% ^0 | |Rotate +90° AM| | 50% ^1 | |Rotate -90° AN| | 25% ^2 | |Mirror horiz. AH| |12.5% ^3 | |Mirror vert. AV| |6.25% ^4 | |----------------| |---------| Desk ---------------------------------------------------------------------------- Important information about OCR and the author and programmer. File drop down menu ---------------------------------------------------------------------------- Load image [Control]+O ---------------------- Loads an image in monochrome GEM .IMG format. If an image is already loaded a dialog appears offering the following options: Save; before the new image is loaded, the old image is saved. Load; the new image is loaded. Any changes made to the old image are lost. Cancel; the command is cancelled. Save image [Shift][Control]+S ----------------------------- Saves the image in monochrome GEM .IMG format. Scan picture [Control]+R ------------------------ Selecting this to scan some text. In order to do this a GDPS-Scanner driver must be installed. If more than one driver is available select the desired driver. Remember OCR currently only handles monochrome images. Set the scanner (and the driver) to sensible settings! If you work with MultiTOS with memory protection switched on, the MP-Flags in the header of the GDPS driver should be set to GLOBAL, because OCR and the GDPS driver need to have access to each others memory. OCR allows its memory to be accessed by the driver if it's installed as an desktop accessory, you don't need to change anything! Save ASCII [Alternate]+S ------------------------ Saves the recognised text in ASCII format. If an existing filename is selected the text in the original file will be overwritten or the text is appended to the selected file. Delete ASCII ------------ The recognised text is deleted. If the text has not yet been saved, a dialog appears offering the following options: Save; the text is saved before it's deleted. Delete; the text is deleted. Cancel; the command is cancelled. Load font [Alternate]+R ----------------------- A font database is loaded. If the font database is already loaded in memory and it has not yet been saved, a dialog appears offering the following options: Save; the current font database is saved before the new one is loaded. Load; the font database is loaded. Cancel; the command is cancelled. Save font [Alternate]+W ----------------------- The font database is saved. Delete font ----------- The font database is deleted. If the font database has not been saved a dialog appears offering the following options: Save; the current font database is saved then removed from memory. Cancel; the command is cancelled. If you wish to create a new database the old one must first be removed from memory. Quit program [Control]+Q ------------------------ Exit the program using this option. If any data has not yet been saved, a dialog appears offering the following options: Save; a last chance to save your data. Cancel; a last chance to remain in OCR. End; quit OCR and return to the desktop. Process drop down menu ---------------------------------------------------------------------------- Mark all [Control]+A -------------------- If the Image Window is topped; the entire image is marked as a block If the Text Window is topped; the entire text is marked as a block Remove block marks [Shift][Control]+A ------------------------------------- Removes the block markers from the topped window (either Image or Text). Cut block [Control]+X --------------------- This option is only available if the GEM Clipboard is available (although the block will be removed anyway!) The clipboard must also be active in the 'General' dialog from the 'Options' drop down menu. The marked block in either the Text or Image windows is moved to the clipboard and removed from the text window. Copy block [Control]+C ---------------------- This option is only available if the GEM Clipboard is available. The clipboard must also be active in the 'General' dialog from the 'Options' drop down menu. The marked block in either the Image or Text windows is copied to the Clipboard for use by another application which supports the Atari Clipboard protocol. Atari Clipboard support ----------------------- OCR supports the Atari Clipboard which normally uses a folder on your boot partition/disk, for example C:\CLIPBRD. Any Atari application which supports the Clipboard can easily exchange data. The Cut and Copy options export data to the clipboard and the Paste option imports Image data into OCR. Here's how it might be used in practice; After scanning in an article from a magazine using an application eg 'SCAN.PRG' we call the Copy option in SCAN.PRG to copy the scanned image to the Clipboard in IMG format. Next we switch to OCR, either directly in a multitasking environment or by leaving SCAN.PRG, and running OCR. In OCR we top the Image window and select 'Paste' to copy the image into OCR. After the text recognition is complete the text window is topped and using the 'Copy' option the ASCII format text is exported to the Clipboard. Now we switch to a word processor to edit/spell check the text before printing out the final result. The clear advantage of the Clipboard is that no filenames were needed to get from scanned image to the printed text, everything took place inside the Clipboard folder automatically, a powerful tool! Paste block [Control]+V ------------------------------- This option is only available if the Atari Clipboard is available. The clipboard must also be active in the 'General' dialog from the 'Options' drop down menu. This option is only available if the 'Image window' is topped. If the Clipboard contains a valid IMG file it will be pasted into the 'Image window'. Delete Block (Delete) --------------------- (No Menu item for this) The 'Delete' key removes a marked block. It won't be copied to the clipboard. Image size [Control]+0 to 4 --------------------------- Using this menu option the image can be displayed at various sizes (this doesn't affect the 'Recognise text' function. Under MultiTOS or on the Falcon the image size is also adjustable through a submenu otherwise a Dialog box appears: 100% [Control]+0 1:1 Original size 50% [Control]+1 1:2 Width and height of the image are both halved 25% [Control]+2 1:4 One quarter full size 12.5% [Control]+3 1:8 One eighth full size 6.25% [Control]+4 1:16 One sixteenth full size Align picture (Alternate M,N,V,H) --------------------------------- Use this option to align text which has been scanned at 90 degrees (a very useful option for hand scanner users) MTOS or Falcon users can use the submenu. Rotate +90° (Alt M) : Rotates the picture 90 degrees anti clockwise Rotate -90° (Alt N) : Rotates the picture 90 degrees clockwise Mirror horiz. (Alt H): If the scanner is moved in the 'wrong' direction the picture is mirrored in memory. Mirror vert. (Alt V): See 'Mirror horiz.' Open text Window [Control]+T ---------------------------- Opens the text Window where the recognised text is displayed. Start recognition [F1] ---------------------- Begins the Optical Character Recognition. If a block is marked only the contents of the block is analysed by the text recognition function. If no block is marked the entire image is analysed. It's important to remove extraneous lines (including underlines in some cases) and other details before starting so the individual characters can be recognised. Important! Please ensure the correct font database is loaded. If no font database is available, use the 'Delete font' option, if available, to remove any font currently in memory. Select the 'Font' option from the 'Options; drop down menu and enter any relevant scanner settings into the dialog and set the width setting for the 'Space' character (see 'Font'). The program searches for the first line. A line must have at least one empty (white) pixel above and below the characters which must at least 5 pixels high (I'm assuming nobody expects to be able to recognise letters smaller than 5 pixels high). Using these rules OCR can ignore underlined words automatically although in some case the descenders will cause problems. If this proves to be the case you'll have to remove the underlining manually using either the 'Block delete' or a suitable Art package. After OCR indentifies a line, the individual characters are isolated and compared with the characters in the font database. The character from the database which best fits the character being analysed is inserted in the text Window. If there isn't a sufficiently similar character in the database to the character being analysed, within the preset degree of saftey, one of two alternatives occurs, dependent one the setting of 'Learn mode' option in the 'Text recognition' dialog from the 'Options' drop down menu: a) If 'Learn mode' is active the mystery character(s) is displayed in a dialog box and marked in the image Window. Enter the appropriate ASCII character into the dialog box. Up to five ASCII characters can be entered because during scanning several characters can be merged together and in some cases OCR cannot separate them. Joined characters (Ligatures) can also be handled using this method. The following options are also available: Include in database (default active); the character is included in the database for future use. Bear in mind that a bad scan may throw up character definitions you'll never need again, so use your judgement to decide whether to save the character for future use. Import into text (default active); decide whether the ASCII characters should be inserted into the text. Exit via 'OK' button; text recognition continues. Exit via 'Cancel' aborts text recognition. b) If 'Learn mode' is not active; a '?' is placed in the text. Both the method used to compare characters and the degree of agreement needed to consider a character as 'recognised' can be adjusted (Refer to 'Options'). Resume recognition [F2] ----------------------- By pressing the [Esc] during recognition it's possible to break off recognition to adjust settings and resume recognition from the last position using the new settings, without starting from the beginning again. Resume recognition is only possible if the image remains unchanged so be careful not to re-size, cut or delete the marked block, use the rotate or mirror options or load another image. You can, however, change your view of the image using the 'Image size' option if desired. Break recognition [Esc] ----------------------- Pressing the [Esc] key aborts text recognition at the end of the current line, so it may take some time before recognition stops. Options Drop down menu ---------------------------------------------------------------------------- Text recognition [Alternate]+O ------------------------------ A dialog appears in which the following settings influence text recognition: Learn mode; if a character is not recognised using the preset levels of certainty, this option decides the next action which can either: a) If Learn mode is active; a further dialog box appears to teach OCR about the unrecognised character. Refer to 'Recognise text' for more details. b) If 'Learn mode' is not active; a '?' is placed in the text. Agreement; this option sets the degree of agreement neccessary before a character is considered recognised. Sound bell on query; selecting this option sounds a ping when the end of the text or an unrecognised character is reached. If the font database is fairly complete, you'll hardly ever hear the ping. Deselect this option or use the Control panel to disable the ping if it annoys you. Display training dialog: If this option is selected (checkbox crossed) every time an unrecognisable character is encountered the 'Indentify character' training dialog appears ready for you to identify the character and add it to the database, if the character comprised more than one character (eg ligatures) these can also be entered. Recognition can be speeded up by de-selecting this option (checkbox empty) in which case OCR highlights the unrecognised character and you can enter the ASCII character directly using the keyboard. If you need to enter more than a single character (eg ligatures) press the [spacebar] to display the 'Indentify character' training dialog. Insert in database/text: Sets the default action when a character isn't recognised. Using a large database OCR is only likely to inquire when scanning errors are encountered. Normally you wouldn't want to include these characters in the font database and using this option you can switch it off permanently. Important! When you're in the process of creating a new database remember to switch this option on again! Filter out single pixels: If this option is set, single pixels within characters are filtered out. Select this option (checkbox crossed) when scanning at a resolution greater than 200dpi to improve the recogition rate. If your scans are Because this takes longer you may prefer to de-select (checkbox empty) this option if your scans are clean. Character comparison; OCR attempts to recognise characters by placing the electronic equivalent of a 'stencil' over each character. Three levels of analysis are available: Exact; This takes a longer processing time than medium or fast due to different priorities for the differences when checking the characters but yields the highest level of accuracy. Medium; This option does not assign different priorities to differences. It's quicker but may incorrectly recognised when scanned at a low scanning resolution. At 300dpi this shouldn't be a problem and is worth a try before resorting to 'Exact'. Fast; Similar ro 'Medium' but a bit faster and probably a slightly higher level of wrongly recognised characters. Image quality; if the image originates from a scanner you should always select 'Scanner'. Small differences between the characters, which occur during scanning, are filtered using this setting. Using the Scanner setting ALL differences between characters are considered. As the size of the characters approaches the lower limit (5 pixels high is the absolute minimum) the filters remove so much of the original character that recognition becomes unreliable and very time consuming. If the image file originates from a drawing or DTP application and includes GDOS or system fonts these characters are likely to be precise so select the 'Precise' setting. Image slope This option determines whether OCR will accept angled images. You can usually leave this option on unless the text consists of short lines with lots of preceding spaces. For example, envelopes with sender in the upper left hand corner and the address in the lower right hand corner. Font [Alternate]+F ------------------ This option displays the options for the currently loaded database: Minimum character size: Width, Height: These set the minimum size a character can occupy. Any part of the image smaller than the values set are ignored. Small dots caused during scanning are simply ignored. Measure...: A crosshair shaped cursor appears, using a click and drag action, over the text image, draw a box to define the width and/or height of the minimum character size then release the mouse button. On exiting the dialog OCR checks these settings against all the characters in the database to make sure no characters smaller than the entered settings (otherwise they would not be checked). If any character(s) smaller than the selected settings are found the settings are changed to the size of the smallest character. An alert box informs you if this has taken place. Minimum space width: Width: Sets the minimum width occupied by a space character. Variable: If the font is monospaced (i.e. each space character is the same width) deselect this option, otherwise leave it active. Measure: A crosshair shaped cursor appears, using a click and drag action, over the text image, draw a box to define the width of the space between words and release the mouse button. If you change the image viewing size the space width is automatically resized i.e The size of the box relates to the image size) Important! This setting determines the MINIMUM width for spaces. Comments; use these fields to enter any desired text describing the database, for example: font origin (magazine/book/typed) scanner settings (dpi/contrast/brightness). This text is stored with a .LIB extension along with the font database for easy future reference. Edit font [Alternate]+E ----------------------- Select this option to display the 'Edit font' dialog. Using the options in this dialog you can undertake changes to fine tune the font database. Font overview; using this option you can scroll through the characters. A character can be selected by clicking on it and it appears in the 'Selected character' area. Selected character; this area is used to assign or change the ASCII character (or string of up to 5 ASCII characters) associated with the selected character. Using the 'Delete' button you can delete the selected character from the font database. Search (for character); this option is used to move to the desired area of the ASCII table. 'Search' begins searching from the beginning, 'Again' continues searching from the current position. If the search is successful, the character found will be displayed in the 'Selected character' area. Sort; the font database is sorted. Statistics; an overview of the font database is displayed. From this display it's easy to see at a glance which characters have not yet been defined (or duplicated) along with other useful information. Only the main ASCII characters are displayed. Correction [Alternate]+C ------------------------ Selection this option to display the 'Correction' dialog. Text recognition is not an exact science and is rarely perfect. There are characters which even the human eye has difficulty recognising except by context, eg '1'and 'l'. OCR is intelligent enough to consider the surrounding characters and will for example return '1' if the character being analysed is surrounded by numerals. Some characters are recognised as two or more individual signs, <"> for example is recognised as two <'> characters. Using the options in the dialog these problems can be minimised. Substitutions; enter a character string combination which should be replaced by another. You may like to define the previous example which converts <'><'> to <">. Corrections; selecting this option enables the auto correction of very similar characters such as 1/l, l/I or 0/O. Important! Bear in mind auto-correction is not foolproof and can in individual cases return the wrong result! Text format: Original format; a line of text in the image becomes a line of ASCII text, preceding space characters can be ignored. New format; the text format of the image is ignored and a completely new format is imposed according to the 'Line length' setting. This is particularly useful when converting narrow columns of text which often contain a liberal sprinkling of hypenated words. Remove hyphens; this option attempts to reconstruct whole words. If you're converting German text which follows the 'k-kck' convention the additional option to convert these characters should be activated. For all non-German texts this option should be turned OFF. Important! Generating a new format is not a good idea for program listings, source code, tables etc!) Number of empty lines; set the number of lines in the ASCII text between seperate OCR runs. Unknown character; defines the character used to replace unrecognised characters if 'Learn mode'. General [Alternate]+A --------------------- Dialogs: Dialog boxes can be set to appear centred on the screen or under the mouse pointer. The 'In windows' option (unsurprisingly) puts the dialogs into windows. In a multitasking environment the 'In windows' option allows other processes to continue whilst waiting for user input whereas non-windowed (modal) dialogs freeze all other processes. If you're NOT multitasking the normal (modal) dialogs are slightly faster. Paths & Files; click on any box and use the file selector to set the corresponding path. On starting OCR these paths are automatically set so that loading/saving takes place to the desired directory. Text Window; if this option is active the text window is opened automatically after starting OCR. Clipboard; sets up which actions the clipboard will handle. This works with both the 'Image' and 'Text windows. This is handy to 'Cut/Copy' recognised text to the clipboard and NOT 'Cut/Copy' parts of the graphic (maybe images apart from the scanned text) over the text in the SCRAP.TXT (There's only ever one SCRAP.* in the clipboard). AND: Not copying images to the clipboard saves time. Files; click on these boxes and using the file selector select any files you would like automatically loaded by OCR. You could use this option to load a default set of font database and/or set of correction rules. Save ---- Saves OCR's settings. The following settings are saved: * All settings in the 'Recognition', 'Image size' and 'General' dialogs. * Window layout and size for both the image and text windows. ============================================================================ Hints & tips ---------------------------------------------------------------------------- When creating a font database always be sure to record the scanner settings. When you want to reuse the font database remember to set the scanner to the settings used when the database was created. If you don't do this the characters can easily appear thicker or thinner and can make the font database virtually useless. Ideally keep a seperate database for each different font and point size you scan regularly. This keeps the databases small and considerably speeds up text recognition. It's probably not practical to stick rigidly to this rule as you may want to convert text containing both normal and italicised versions of the same font within a body of text... Fill out the 'Comments' field including the scanner settings, font details and source conscientiously. Make the best possible scan by adjusting the scanner settings. Adjust the brightness and contrast so that characters neither 'grow' together or start to break up ans show gaps. If you can't get a perfect scan it's preferable to accept characters which grow together rather than single characters which are starting to break up, try using a higher contrast. The lower the scanner resolution the smaller the memory requirements for the database and the faster text recognition takes place. However, if you scan at too low a resolution characters will start to grow together. There's no substitute for experimentation to find the best combination of settings for each task. If your scanner only supports low resolutions (e.g. 200dpi or less) it takes more effort and time to get good results. Whilst building the database we strongly suggest you set the agreement to 90%. You'll find some characters (eg 'e', 'c', 'b' and 'h') may well be entered into the database more than once. After all important letters are in the database you can lower the agreement to around 85%-75% and get acceptable results without OCR asking too often. By adjusting the 'Agreement' setting it's possible to get good results even at low scanner resolutions. If characters are repeatedly being incorrectly recognised increase the degree of agreement, although OCR is likely to display it's manual recognition dialog more often. You can enter characters which are not available on the keyboard into dialogs in several different ways: a) Using TOS versions later than 2.06/3.06 or MultiTOS hold down the [Alternate] key and enter the ASCII code for the desired character into the numeric keypad. b) Install 'Let'em Fly' and press [Shift]+[Insert] and a further dialog appears from which you can select the desired character. c) Use 'COMPOSE' by Pascal Fellerich Switch off Clipboard support if you don't have a harddisk (Refer to the 'General' dialog in the 'Options' drop down menu). ============================================================================ Technical ---------------------------------------------------------------------------- OCR supports: - The expanded WM_ARROWED and WM_BOTTOMED calls in Winx 2.2. - The VSCR Cookie, this means that dialogs will always be displayed in the visible portion of a virtual screen. - On the Falcon (>=TOS 4.02) and under MultiTOS the 3D effects are supported in dialog boxes. - Sub menus (for Image size) - MultiTOS Drag&Drop (ARGS) RAM usage: Most RAM is used scanning the images. This RAM is needed twice, once in standard format (the ocr accesses the data from this part) and again in the format relevant to the display device used. Here's a guide: A DIN A4 page (8*11 inches), scanned at 400 dpi uses around 1.7Mb. OCR needs 2 x 1.7Mb = 3.4 Mb. ============================================================================ Known bugs and limitations ---------------------------------------------------------------------------- In rare cases OCR cannot separate two characters where OCR believes they are only one character. For example where characters consist of several unconnected parts and all letters followed by a punctuation mark [i, j, ä etc.] or [ñ, å etc]. OCR does not try to seperate these letters into several parts, however OCR does attempt to seperate several overlapping letters although the degree of success is variable! At high scanner resolutions the size of the database and computer time needed becomes unmanageable, especially on a standard ST. The size of the characters is currently limited to a mazimum of 96x96 pixels, which is enough to handle characters at 400 dpi with most scanners. (2-3 character ligatures still fit into 96*96 pixels). An error in operating systems <=TOS 2.06 can cause OCR to display pixel garbage instead of a large picture. An error in the 'vr_trnfm()' function causes this. There's a patch by Laurenz Pruessner, S. and W. Behne that fixes this (Released in the German ST-Magazin 9/91). If you have a TT/Falcon or use an NVDI/VDI driver with a graphics card you don't need this fix. Important! From OCR V1.2a this bug won't appear even without one of the above fixes -a little trick makes this possible :-) ============================================================================ The future ---------------------------------------------------------------------------- The following enhancements are planned (suggestions are always gratefully received): * Analysis of unrecognised characters after the complete image (block) has been processed. OCR could attempt to automatically complete partial databases asking the occasional question before reaching a final conclusion. * Batch mode: the ability to automatically handle different texts one using a batch file (requires the first ToDo topic) * Allows pixel level editing of the characters in the data base. * Handle several font databases simultaneously. This would make it much easier to handle multi font/point size text layouts. ============================================================================ Other ---------------------------------------------------------------------------- I recommend the installation of 'Let'emFly' by Oliver Scheel as this adds many enhanced features such as keyboard shortcuts, flying dialogs and character selection to dialog boxes. Winx by Martin Osieka. With the help of this program up to 40 windows can be open simultaneously. Many other window enhancements are built-in. All these programs are available on BBSs and FTP Servers or direct from the authors. ============================================================================ Credits ======= Many thanks to: Jean-Jacques Ardoino: French RSC Joe Connor: English RSC, English DOCs editor, UK Support Stefan Damerau: English DOCs, all the hard work before Joe edits it! Henk van der Griendt: Dutch RSC, LEESMIJ Many thanks to all the people who made suggestions, sent bug reports or a donation And (last but not least) to all Beta testers. ============================================================================ History ---------------------------------------------------------------------------- Version Date Changes ---------------------------------------------------------------------------- V1.3 10.08.1994 - Keyboard shortcuts in dialogs. - Bugfix: Bug in Searching for keyboard shortcuts in the menu fixed. - OCR now reacts faster to events during recognition. - Windowed dialogs ([Undo] same action as 'Cancel') - ST-Guide AND 1st-Guide format on-line Help provided. - Bugfix: Problems with 'I/l Correction' resolved - GDPS scanner driver support - Two buttons moved from 'General' to a better position in 'Recognition'. - Characters can be indentified without displaying the 'Indentify character' dialog which is much faster as [Return] after each character is no longer needed - Minimum character measurements can be set which results in better separation of characters and pixels in bad scans) - Filter can be switched ON/OFF - Checkboxes and radio buttons can be selected by clicking the text beside them. - Problems with some IMG's (those which contain more scanlines than defined in the header) fixed - New file format for *.LIB and *.KOR files. Naturally the old format is still supported V1.25b 30.05.1994 - Bugfix: Bug in character separation fixed - Bugfix: Bug in 'Reformat' (Correction dialog) fixed V1.25a 20.05.1994 - Bugfix: German RSC-file: Text of an Alert button shortened :-( 10 characters per button is the limit and I hadn't noticed this because MultiDial and Let'em fly both support more. - Bugfix: Error handling 'Save ASCII' fixed - Bugfix: MTOS Problems when scrolling (apparently MTOS sends MU_BUTTON-events too)... - Info line in the graphics window. The image and block (if marked) sizes are displayed. During recognition progress is reported. When running under in a multitasking environment the busy bee is no longer displayed and control is enabled. - When running under in a multitasking environment the some menu items can now be selected during recognition. V1.25 05.05.1994 - 'Resume recognition' now possible - Better recognition of <'> or <'> characters - 'k-kck' correction (hyphen removal option) can be switched off (important for all non-German texts) - Filenames: Missing extensions automatically added - Filenames (IMG, LIB, KOR) can be loaded automatically by passing them as parameters from a command line - Line seperation bug removed (caused some crashes) - Newer, faster algorithm for comparison using the 'medium/fast' setting in the 'Recognition' dialog - AP_TERM (MTOS) support - Recognition speed dramatically increased - Image alignment (mirror/rotate) built-in (ready for direct OCR scanner support) - Moveable window contents using right mouse button - MultiTOS Drag&Drop support (ARGS) - English DOCs included. (Many thanks to Stefan Damerau and Joe Connor) V1.2a 29.03.1994 - Character seperation bug removed (only caused problems with 'thin' GDOS fonts; This bug was built in with V1.2 first time :-/ - VDI font size calculation bug removed V1.2 08.03.1994 - Moveable dialogs can be move transparently (by holding down the [Shift] key) - Faster recognition - Better character separation - Wildcard for unknown letters now user defined - IMG load error fixed - Oblique scans can now be recognised - Several minor new features added - First release with English manual/Resource and French resource V1.1a 06.02.1994 - Unneccessary 'redraws' removed - Text block deleting error fixed - Error in character comparison removed V1.1 04.02.1994 - Clipboard support added - Redraw error in scrolling fixed V1.0a 01.02.1994 - Redraw error in the graphics window fixed - OCR doesn't try to install a submenu under Mag!X 2.0 V1.0 30.01.1994 - First release ---------------------------------------------------------------------------- EOF