Imperx IPX-VGA120-L User Manual page 78

Example 5 – Digital Shift
The "Digital Shift" feature allows the user to change the group of bits sent
to the camera output and therefore manipulate the camera brightness and
contrast. The internal camera processing of the data is 12 bits. If the camera
is set to output 10 bits of data then the two least significant bits are
truncated. In some cases the user may need to convert from 12 to 10 bit by
preserving the 2 least significant bits and truncating the 2 most significant
ones. In other occasions the user may need to increase the image brightness
2x, 4x, 8x, etc.
Example A. Increasing the image brightness 2x:
D0
0
Example B. Increasing the image brightness 4x:
D0
0
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The original camera data is D0 (LSB) to D11 (MSB)
Input Data - 12 bit
D1 D2 D3 D4
Create a LUT in which the bits are shifted by one to the right.
Modified 12 bit Output Data - (11 bit data + 1 bits shifted right)
D0 D1 D2 D3
The original camera data is D0 (LSB) to D11 (MSB)
Input Data - 12 bit
D1 D2 D3 D4
Create a LUT in which the bits are shifted with two to the right.
Modified 12 bit Output Data - (10 bit data + 2 bits shifted right)
0 D0 D1 D2
of
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D5 D6 D7 D8
D4 D5 D6 D7
D5 D6 D7 D8
D3 D4 D5 D6
LYNX Manual RA02
D9 D10 D11
D8 D9 D10
D9 D10 D11
D7 D8 D9
5/6/2005