Blemish Compensation - JAI Elite EL-2800M-GE2 User Manual

Adjustable range
Less 30%
Color shading correction (For EL-2800C only):
In this case, R channel and B channel are adjusted to match with G channel characteristics.
The block grid for compensation is 15(H) x 12(V) blocks and the complementary process is
applied to produce the compensation data with less error.
Before adjustment
Note: Under the following conditions, the shading correction circuit may not work properly.
If there is some area in the image with a video level less than 70%

 If part of the image or the entire image is saturated
If the highest video level in the image is less than 300LSB (at 10-bit output)

8.6.

Blemish compensation

The EL-2800M-GE2 and EL-2800C-GE2 have a blemish compensation circuit. This function
compensates blemishes on the CCD sensor (typically pixels with extremely high response or
extremely low response). This applies to both monochrome and color versions. Pixels that fulfill the
blemish criteria can be compensated by adjacent pixels in both columns and, in the case of the
EL-2800C-GE2, the defective pixels can be compensated by the same Bayer color pixels in both
adjacent columns. The number of pixels that can be compensated is up to 300 pixels.
EL-2800M-GE2 / EL-2800C-GE2
Fig. 47 Flat shading correction concept drawing
Fig.48 Color shading correction concept drawing
After adjustment
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