PixArt Imaging Inc.

PAS005B

CMOS Image Sensor IC

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PixArt Imaging Inc.

**Windowing and sub-sampling can be used independently.

4.3.3

Sub-sampling with average--in color mode

PAS005B supports average data output in sub-sampling mode in color mode. In this mode, the PAS005B

averages the pixel data with surrounding pixels that are with the same color. For example, in VGA-sub-

sampling, in which both vertical and horizontal pixels are sub-sampled at 1/2, the sub-sampled pixel data are

[i,j]′= ( [i,j] + [i,j+2] + [i+2,j] + [i+2,j+2] ) / 4,

while in CIF-sub-sampling, the sub-sampled pixel date are

[i,j]′= ( [i,j] + [i,j+2] + [i,j+4] + [i,j+6] + [i+2,j] + [i+2,j+2] + [i+2,j+4] + [i+2,j+6]) / 8.

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Fig 4.3.3

4.3.4 Sub-sampling with average—in mono mode

PAS005B supports average data output in sub-sampling mode in mono mode. In this mode, the PAS005B

averages the pixel data with surrounding pixels that are with the same color. For example, in VGA-sub-

sampling, in which both vertical and horizontal pixels are sub-sampled at 1/2, the sub-sampled pixel data are