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recommend level is half of maximum), and the average across the line is calculated. Based
on this average, coefficients are then generated for each individual pixel. The coefficient
has the function of multiplying the pixel output with a factor greater or less than 1. These
coefficients are stored in a non-volatile memory, and are therefore maintained after
power down.
7.26. Command PGS -
Request Status After Pixel Gain Correction
This command returns the status of the pixel gain correction, with the following
parameters:
0=Not completed yet
1=Succeeded
2=Error1: Image too bright
3=Error2: Image too dark
4=Error3: Timeout occurred
7.27. Command SDC – Select Shading Correction Mode
This function enables (or disables) shading correction.
Settings:
0 = off (Bypass)
1 = Factory setting (default)
2 = User area
Associated functions:
Commands PGR, SDR and SDS
7.28. Command SDR – Run Shading Correction
This function initiates automatic shading correction, and stores the result to the user area.
This function should be used together with the flat-field correction (commands PGC and
PGR). There are two types of shading correction: Individual R, G and B channel correction
and chromatic shading correction.
(
A) Flat shading correction (SDR=0)
Shading is calculated and individually compensated for R, G ,B and NIR channels
respectively. The calculation is based on the average value of 8 consecutive pixels. The
maximum deviation that can be compensated is -30% of the highest signal level
(brightness) of the line.
Note:
•
Depending on the
Individual shading correction
per channel
After correction: flat response from pixel to
pixel
Average
