Binary (Dither Screen Method); Controlling The Image Memory; Compression/Expansion, Rotation, And Enlargement/Reduction; Sdram - Canon iR105 Service Manual

CHAPTER 3 MAIN CONTROLLER

2.2.7 Binary (dither screen method)

The dither screen method is used to control the texture, subjecting the data to binary pro-
cessing. Specifically, the 8-bit image density signals in film photo mode are converted into
1-bit image density signals (binary).
Although binary, images are produced in 144 gradations owing to the 12 × 12 dither
screen processing.

2.3 Controlling the Image Memory

The binary image data is controlled in image memory as follows:

2.3.1 Compression/Expansion, Rotation, and Enlargement/Reduction

Binary images are processed for compression/expansion (for electronic sorting), rotation,
or resolution conversion.

2.3.2 SDRAM

The image data is temporarily stored as part of image memory control.
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