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Glossary
Appendix D
Pixel
Pixels are the points that make up images. The monitor screen is 512 pixels high and
484 pixels wide which means that the screen contains approximately 250,000 pixels.
Adjust the field of vision so that the number of pixels per cell is at least 5. The number of
pixels per cell can be measured in 2. Image Analysis/Measure Length.
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Maximum Data Capacity
The maximum amount of data that can be stored in a code varies with the code size. In
other words, if there is a large amount of data to be stored, then the code size must also
be large. The maximum data capacity will also vary with the type of characters used.
With QR Codes and Data Matrix codes, the numeric capacity (numbers only) is larger
than the alpha numeric capacity (numbers and letters).
Right and Left Reversal
This is the term used to describe reading 2-dimensional codes marked on a transparent
material from the reverse side.
Black and White Reversal
Usually, in images of 2-dimensional codes, the code itself is black and the background is
white. Sometimes, however, due to the material of the reading object and the kind of
lighting used, the code will appear white in the image obtained. This phenomenon is
called “black and white reversal.”
484
pixels
512 pixels
1 pixel
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