Mitsubishi Electric KD Series User Manual page 27

2-3 Definition
【 Dark correction 】
Original data at LED-OFF Original data at LED-OFF
DVd0(n) : n th pixel dark output
Pixel
DVp(n) = DVp(n) –Dvd0(n)
Corrected data at LED-off Corrected data at LED-off
Pixel
TM-XG537C
【 CIS output and signal processing function 】
This product is equipped with correction functions of the
pixel unit. These functions correct the variations due to DC
offset, the sensitivity variation and the lens and the
illuminations, for each pixel of the CMOS sensor and
provide good images.
1. Dark correction
This is a function that corrects DC-offset on each pixel into
zero as the dark output. This function subtracts the pixel
dark-correction data (Dvd0 (n)) from the original pixel dark
output data (Dvp (n)) pixel by pixel.
Dark-correction data (Dvd0 (n)) is generated by averaging
32 lines of the data to minimize the effect of noise on each
pixel in the condition of turning off the illumination. Using
Dark correction on CIS output allows us to get the only
dynamic range responding the incoming light.
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