Defective Pixel Correction; Correction Method - GigE VA Series User Manual

9.12 Defective Pixel Correction

The CCD may have Defective Pixels which cannot properly react to the light. Correction is required since it may
deteriorate the quality of output image. Defective Pixel information of CCD used for each camera is entered into
the camera during the manufacturing process in the factory. If you want to add Defective Pixel information, it is
required to enter coordinate of new Defective Pixel into the camera.
9.12.1

Correction Method

Correction value for a defective pixel is calculated based on valid pixel value adjacent in the same line.
If current pixel is a defective pixel as shown in the above figure, correction value for this pixel is obtained as
shown in the following table depending on whether surrounding pixel is defective pixel or not.
Adjacent Defective Pixel(s)
None
L1
R1
L1, R1
L1, R1, R2
L2, L1, R1
L2, L1, R1, R2
L2, L1, R1, R2, R3
L3, L2, L1, R1, R2
L3 L2
Figure 9.22 Location of Defective Pixel to be corrected
Table 9.14 Calculation of Defective Pixel Correction Value
70 of 94
L1 R1 R2
<Current Pixel>
Correction value of Current Pixel
(L1 + R1) / 2
R1
L1
(L2 + R2 ) / 2
L2
R2
(L3 + R3) / 2
L3
R3
VA GigE series
R3
RA14-131-003