Blemish Compensation - IAI SP-20000C-USB User Manual

Color shading correction (For SP-20000C-USB only):
In this case, R channel and B channel are adjusted to match with G channel characteristics.
block grid for compensation is 20 blocks (H) x 15 blocks (V) and each block contains 256 x 256
pixels. 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)
Table – 50 Associated GenICam register information
GenICam Name
Shading Mode
(Only Color Model)
Perform Shading Correct
Shading Mode
8.6

Blemish compensation

The SP-20000-USB has a blemish compensation circuit. This function compensates blemishes on the CMOS
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 averaging
the data from pixels in both adjacent columns and, in the case of the SP-20000C-USB, the defective
pixels can be compensated by averaging the data from the same Bayer color pixels in adjacent columns.
The number of pixels that can be compensated is up to 1000 pixels.
SP-20000M-USB / SP-20000C-USB
Fig. 44 Concept drawing of Color shadingcorrection
Access
R/W
R/W
Blemish Compensation Principle
B/W
Color
Fig. 45 Blemish compensation
After adjustment
Values
Flat Shading
Color Shading
WO True
Off
User1
User2
User3
Defective Pixel
- 90 -
The
Category
JAI-Custom
JAI-Custom
JAI-Custom