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Mitsubishi Electric KD Series User Manual page 26

Contact image sensor, web surface inspection
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2-3 Definition
【Dark correction】
Original data at illumination(LED)-OFF
Original data at illumination(LED)-OFF
th
DVd0(n) : n
pixel dark output
Pixel
DVEp(n) = DVp(n) –Dvd0(n)
Corrected data at illumination(LED)-off
Corrected data at illumination(LED)-off
Pixel
TM-XJ959A
【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 and the sensitivity variation of each pixel of the
CMOS sensor, the lens, and the illuminations, and enable
this product to provide good images.
1. Dark correction
This is a function that corrects DC-offset on each pixel into
zero. 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 this product to
provide the only dynamic range responding the incoming
light.
26
© Mitsubishi Electric Corporation

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