CYIL1SE3000AA-GZDC Cypress Semiconductor Corp, CYIL1SE3000AA-GZDC Datasheet - Page 48

• Manufacturer Part Number: CYIL1SE3000AA-GZDC
• Description: IC IMAGE SENSOR 3MP 369-PGA
• Manufacturer: Cypress Semiconductor Corp

Specifications of CYIL1SE3000AA-GZDC

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The fpn lines in the darker regions are no longer present.
However at an angle, fpn lines can be seen in the brighter region
as marked in the image. These lines in the brighter regions can
be eliminated by applying PRNU correction as explained here.
Note that PRNU correction should be applied along with FPN
correction, it cannot be applied individually.
Off Chip PRNU Correction
Pixel Response Non-uniformity (PRNU) is also a kind of spatial
noise and it refers to the slight variations in response to the same
input that each pixel has due to the slight active response varia-
tions 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.
This is corrected with the help of a grey image and the correction
is done by equalization of gain.
Document Number: 001-44335 Rev. *C
Figure 38. Image with FPN Correction
PRELIMINARY
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
The image with both FPN and PRNU correction is shown in
Figure
in saturated regions.
1. Capture the grey image under the same condition as the dark
2. Open the aperture of the lens to allow light and then capture
image.
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.
39. Note that no FPN lines are present in this image even
CYIL1SN3000AA
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