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1993-06-15
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Document Number 2250
Recognition Hints and Tips for Perceive Personal
7/13/92
1. Always scan in line-art or black and white mode.
2. Selecting The Right Resolution
Most magazines and text books should be scanned at 300 dpi. Use 400 dpi if
the text you are scanning is smaller than standard magazine size. For
normal sized text (8 to 15 points), 300 dpi is the best resolution. Use 200
dpi if you are scanning large blocks of headline-style type.
Text Size Scanner Resolution (DPI)
----------------------------------------------
6 to 8 Points 400 DPI gives best results
9 to 15 Points 300 DPI gives best results
16 to 20 Points 200 DPI gives best results
3. Adjusting Contrast
Contrast control (the relative amounts of black and white) is critical
in obtaining a good scan. If the text to be scanned is too faint and the
scanned image shows excessive broken characters, then the recognition will
be poor due to the unrecognized characters. If the scan is too dark, the
letters will run together and cause poor recognition. In any initial
scanning of a new image, you will need to adjust the contrast. Perceive
Personal tends to prefer a darker contrast, so start with the contrast
setting slightly darker than the middle notch on the scanner.
4. Scanning Speed
For the best image quality, experiment with the scanning speed to
determine the best rate for your computer. You should be scanning at an
acceptable rate so the speed indicator light on the scanner head does
not flash. When you scan too fast the characters may look compressed, which
causes character size inconsistencies. Try to scan a bit slower than the
normal rate recommended by the scanner software, perhaps at about 1/2 to
1 inch per second. This way the system can receive and process all of the
incoming scanned data in time.
Make sure your scanning does not get too far ahead of the real-time
display. On slower machines the disk access speed cannot keep up the with
the rate of incoming data passed from the scanner to the machine channel.
Before you hit RETURN to activate Recognition, view the entire image to check
whether all the data is captured to screen. When you have scanned too fast
for the system, you may notice the final image displayed will have loss of
data, i.e., certain chunks of paragraphs are missing. In this case, you will
have to rescan slower. Scanning too slowly will not affect the quality of
the scanned image.
5. Scanning Straight
When the actual scan is slanted, skewed, or jagged, the text will not
be recognized fully. Use a hard edge ruler or the edge of a book to help
scan straight. Or press the left index finger on the left edge of the
scanner window casing as your right hand is holding the scanner to scan.
This will balance the weight of pressure in scanning and help align the scan
direction straight down the material.
6. Practice!
As you become more and more familiar with the way Perceive works -
what it recognizes and what it doesn't - you will find your results increase
dramatically.
7. Full Page Scanning
When attempting to scan a full page, scan the page in two strips with an
overlap of 1/2 to 1 inch. Scan both sides straight, at the same speed,
and make sure both strips begin and end at the same height on the page.
TROUBLESHOOTING
Following are the most common reasons why an OCR program may misread text:
Unrecognizable fonts or characters. Omnifont technology recognizes standard
fonts by comparing text characters to features programmed into the software.
The software will not read characters which don't match programmed features.
It may also misread similar characters, for example 1 and l.
Original document quality directly affects accuracy. Letters which are
faint, touching or otherwise illegible may be read inaccurately. Newspapers,
copies and faxes are often poor originals.
Uneven or fast scanning, or pausing in mid-scan may result in skewed,
stretched or compressed text. Follow the tips above to avoid these causes
for misrecognition.