OCRADNACED TECH, HOW TO USE OCR AND ALL NECESSEARY THINGS

OCR TECH

1. 1
OCR Reading

2. 2
Class Summary
•Description
–Overview of how to use the OCR softsensor
–Advanced Settings
•Class Level
–Intermediate
•Prerequisites
–Basic FrameWork Training

3. 3
OCR SoftSensors
•Optical Character Recognition (OCR)
–Recognizing and reading characters by
comparing to list of previously trained ones.
Reading any code containing these characters
•Optical Character Verification (OCV)
–Matching a particular pattern of predetermined
characters. Verifying a specific string of characters

4. 4
OCR SoftSensors
•Sample application industries
–Pharmaceutical
–Automotive
–Electronics/Semiconductors
–Packaging
–General manufacturing

5. 5
OCR SoftSensors
•Variety of special threshold options
–Computed, linear and non-linear
•Train your own characters
•Ability to read dot matrix, segmented and stroke (e.g.
Japanese) characters
•Capability of handling rotation and reading curved text
•Control of spacing and character size

6. 6
OCR SoftSensors: For Best
Results
•Characters must be able to be extracted by
thresholding
•Characters must be repeatable from one image to the
next
•Avoid images with textured or printed backgrounds
•OCR “friendly” fonts
–OCR A, OCR B, Semi
–Undecorated, non-serif fonts
•Character height between 20 and 30 pixels

7. 7
Advanced OCR Features.
Thresholding changes:
• Dominant Color
• AutoBimodal ~ Automatically calculates a
single threshold value to use based on the entire
histogram. Reduces the effects of noise and
specular reflections.
• Adaptive ~ Calculates a specific threshold
value for different areas of the image depending
on the contrast found in those areas. Makes the
overall threshold more robust when lighting and
contrast are not uniform.
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Advanced OCR Features.
Dialog boxes changed to make set-up
easier.
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Advanced OCR Features.
New font list with images.
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10. 10
Advanced OCR Features.
New Character Info with images.
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Advanced OCR Features.
Orphan Removal ~ Disregard pixels that are
not part of the character but are of the same
intensity value as the character.
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Advanced OCR Features.
Fill Characters ~ will fill in the holes in a
character which helps with the matching process.
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Advanced OCR Features.
Minimum edge width ~ This parameter can
be used to filter out noise by requiring a
minimum number of character pixels in order
to start forming a character box.
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Advanced OCR Features.
Advanced Maximum Character Width
~ When this parameter is used, the system
will start at the maximum character width location
and search backwards 20% of the maximum
character width looking for the vertical line
which has the fewest character pixels.
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Advanced OCR Features.
Aspect Ratio Dependence ~ When
enabled the tolerated variance is user definable.
When disabled, objects must be within ±200%
of the object in the font list or no comparison is
made.
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Advanced OCR Features.
Resolution selection.
Features matched per character:
200 800 1600
LOW MEDIUM HIGH
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Rotated, Skewed and
Italicized Characters
Use the Parallelogram OCR Softsensor
•Take care drawing the sensor, it is sensitive to
angles.
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Conclusion
•Characters must be repeatable from one image to
the next
•Avoid images with textured or printed
backgrounds
•OCR “friendly” fonts
–OCR A, OCR B, Semi
–Undecorated, non-serif fonts
•Character height between 20 and 30 pixels
•Use OCV whenever possible to eliminate misreads

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Questions?