NOIL1SN3000A-GDC ON Semiconductor, NOIL1SN3000A-GDC Datasheet - Page 43

• Manufacturer Part Number: NOIL1SN3000A-GDC
• Manufacturer: ON Semiconductor

Specifications of NOIL1SN3000A-GDC

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Software FPN Correction
Off-Chip PRNU Correction
spatial noise. It refers to the slight variations in response to
the same input that each pixel has due to the slight active
response variations between the amplifiers within different
pixels. Even though every pixel is carefully designed to
match one another, slight variations in processing, noise,
and other areas can cause these amplifiers to behave
differently.
The procedure is as follows:
Pixel response non-uniformity (PRNU) is also a kind of
1. Adjust the black level with the help of histogram
2. Store a dark image by closing the lens aperture,
3. Subtract the dark reference image from all the
by modifying DAC offset.
but make sure no value is absolute zero.
captured images.
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correction is done by equalization of gain.
This is corrected with the help of a grey image; the
The procedure is as follows:
FPN and PRNU correction formula:
Vn = (Avg(Wn) / [Wn - Bn + 1]) x (Gn - Bn)
Vn - data of a pixel after a calibration
Gn - data of a pixel before carrying out a calibration
Bn - black calibration data of the pixel
Wn - white (gray) calibration data of the pixel
1. Capture the grey image under the same condition
2. Open the aperture of the lens to allow light and
as the dark image.
then capture the grey frame. All the pixels in the
grey image should have a grey value of
approximately 70% white (histogram should peak
at 70% white and the distribution should be
uniform around the peak as much as possible).
This grey image is stored.