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August 2nd, 1995
5. OR processing
•
When the user selects Standard or Detail resolution, the DIP will either
do OR processing and/or skip alternate lines of data to convert the
scanned resolution into the resolution required for transmission. (See
"Sub Scan Resolution Conversion in section 2.1.1".)
If Halftone was selected
1. Gamma correction
•
Gamma correction corrects the response of the image sensor to the vari-
ous shades in the gray scale from black to white.
2. Edge detection
•
Each pixel is tested in relation to its neighbours to determine whether it
is on a edge of a image pattern.
3. Halftone process
•
Each pixel is converted to six-bit (0 - 63) using either the dither or the er-
ror diffusion formula. At the same time, if the pixel is on a edge of a im-
age pattern, it is enhanced to to get a sharp outline.
•
Then, each pixel is thresholded with the corresponding threshold in a
dither matrix or error diffusion matrix.
3. Video Processing Parameters
Some of the parameters used for digital image processing can be changed
by RAM addresses.
1. Contrast
RAM addresses 800042 to 800047. See section 4-5 for details.
2. Image processing parameters
RAM addresses 8003FD to 800404. See section 4-5 for details.
DETAILED SECTION DESCRIPTIONS
2-11
SCANNER
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