IMAGE PROCESSING
22 December 1998
2-20
Gamma (
γγ
) Correction
The gamma curve corrects the response of the CCD to grayscales in the original.
Grayscale Processing
This process generates up to 256 image density levels for each pixel.
Dithering
Dither processing produces good quality grayscale images of photo originals.
Error Diffusion
The error diffusion process reduces the difference in contrast between light and
dark areas of a halftone image. Each pixel is corrected using the difference
between it and the surrounding pixels. The corrected pixels are then compared with
a matrix table.
Binary Picture Processing
Each video signal level is converted from 8-bit to 1-bit (black and white image data)
in accordance with a threshold value.
White/Black Conversion
Inverts the image (converts from white to black and vice versa).
After video processing, the data goes to the host computer through the memory
and SCSI controllers.
