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Text File | 1994-10-10 | 3.8 KB | 144 lines | [TEXT/MPS ] |
- README.Unistrokes
- -----------------
-
- This file describes a development version of a Unistrokes recognizer for
- the Newton computer.
-
-
- Description
- -----------
-
- This program was written to test the feasibility of Unistroke recognition
- on the current generation of Newton PDAs and to collect data on the
- perfomance of the Newton in stroke collection and recognition. It
- has no other intended utility. Read the Caveats section.
-
- Information on Unistrokes
- -------------------------
- FTP: ftp.parc.Xerox.COM
- Directory: /pub/unistrokes
- Purpose: Public documentation for the unistrokes stylus system.
- Maintainer: David Goldberg <goldberg@parc.xerox.com>
-
-
- Screen Layout
- -------------
-
- The screen layout of this program from top to bottom has the following
- elements:
-
- ++ Title:
- -- The name of the application "Unistrokes Testbed".
-
- ++ Recognized text:
- -- A line of text beginning with a ">" character which accumulates characters
- recognized within the "Recognition rectangle". If a stroke is detected
- but not recognized either a '*' or '#' will be placed (which depends on
- internal details of recognizer).
-
- ++ Recognition rectangle:
- -- The area in which to make a unistroke for recognition. The unistroke
- needs to be made entirely within this rectangle.
-
- ++ Shift button:
- -- A check box button, which when tapped will cause the next character
- recognized to be capitalized.
-
- ++ Statistics area:
- -- Two lines of text. When the program starts, the first line has a
- version number followed by build date and time, while the second line
- has a copyright notice. These are cleared when the first stroke is
- detected in the "Recognition rectangle", unless the "Show Statistics"
- button is checked.
-
- An example of statistics display:
- 37 177 79 203,ink:8,pnts:30,ticks:15
- (r)
-
- 37 177 79 203
- -> first and last X, first and last Y coordinates.
-
- ink:8
- -> the stroke took about 8 twentieths of a second to write.
-
- pnts:30
- -> a total of 30 points returned by the Newton
- for the stroke.
-
- ticks:15
- -> the recognition algorithm took 15/60 seconds.
-
- (r)
- -> an 'r' was recognized.
-
- ++ Erase button:
- -- Resets the "Recognized text" line to ">".
-
- ++ Show Statistics button
- -- Causes statistics to show up in "Statistics area".
-
-
- Caveats:
- --------
-
- * Not well tested.
-
- * Truncates strokes taking longer than 1.5 seconds. Sometimes will recognize
- them, but unlikely for complex strokes.
-
- * Sometimes misses on quick strokes, especially small ones. Try an 'X'
- with a small, quickly drawn loop - it sometimes sees a 'V'.
-
- * Only the author's strokes have been seen.
-
- * Only tested on Newton MP 100, not MP 110.
-
- * No doubt other problems exist.
-
-
- Comments on findings:
- ---------------------
-
- The Newton with interpreted NewtonScript is too slow to do a
- point by point feature extraction on the collected points, so the
- strokes were sampled about every 50 ms., leading to a lack of
- robustness on quick, complex stokes. On most strokes it did OK.
- Your mileage may vary.
-
- Apple is promising a faster code generator for NewtonScript and
- perhaps a C compiler, but with no time frame. At that time I may
- try again.
-
-
- Legal stuff
- -----------
-
- This program is Copyright © 1994 by James Thiele. It may be distributed
- freely as long as the program is unmodified and is accompanied by this
- README file.
-
- Because there are too many lawyers in the world, I add the following
- statement:
-
- This program is made available without any claim that it is suitable for
- any use. The author's liability is limited to what was charged for it
- which was nothing. It works OK on my MessagePad 100,
- but I am not making any other statements of other systems it could or
- should run on.
-
-
- Author
- ------
-
- You can let the author know what you think of this prgram by contacting him
- at:
-
- James Thiele
- jet@eskimo.com
- 73537,1460 on Compuserve (checked rarely)
- JET1 on AOL (checked rarely)
-
- 8217 5th Ave NE, #303
- Seattle, WA 98115
-
- (Addresses valid as of October 1994)