lm9627 National Semiconductor Corporation, lm9627 Datasheet - Page 12

• Manufacturer Part Number: lm9627
• Description: Color Cmos Image Sensor Vga 30 Fps
• Manufacturer: National Semiconductor Corporation

Functional Description
4.0
4.1
The timing and control circuit can be programmed to sub-sam-
ple pixels in the display window vertically, horizontally or both,
with an aspect ratio of 2:1 as illustrated in Figure16.
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SUBSAMPLING MODES
2:1 Sub-Sampling
a b c d e f g h i j k l m n o p
a b c d e f g h i j k l l n o p q r
a b c d e f g h i j k l m n o p q r
Green Pixel
Not Read Out
Figure 16: Example of 2:1 Sub-sampling
c) Horizontal & Vertical Sub-Sampling
a) Horizontal Sub-Sampling
Column/Horizontal
b) Vertical Sub-Sampling
Column/Horizontal
Column/Horizontal
Red Pixel
(continued)
Blue Pixel
q r
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4.2
The timing and control circuit can be programmed to sub-sam-
ple pixels in the display window vertically, horizontally or both,
with an aspect ratio of 4:2 as illustrated in Figure17
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a b c d e f g h i j k l m n o p q r
a
a b c d e f g h i j k l m n o p q r
4:2 Sub-Sampling
Green Pixel
Not Read Out
b
Figure 17: Example 4:2 Sub-sampling
c d e f g h i j k l m n o p q r
c) Horizontal & Vertical Sub-sampling
a) Horizontal Sub-sampling
Column/Horizontal
b) Vertical Sub-sampling
Column/Horizontal
Column/Horizontal
Red Pixel
Blue Pixel
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