Chromasens CD40127_R02 allPIXA_pro_User Manual.docx
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4.5.2 Supported Camera Link modes
allPIXA pro - color camera with color output:
CL-Base 1Tx24b (1X1)
CL-Medium 2Tx24b (2XE)
CL-Medium 2Tx24b (1X2) Default
CL-Full64 8Tx8b (1X8 raw, RGB with 8 color planes per camera link clock)
CL-Full80 8Tx10b (1X8 raw, RGB with 8 color planes per camera link clock)
CL-Full80 10Tx8b (1X10 raw, RGB with 10 color planes per camera link clock)
allPIXA pro - color camera with mono output:
CL-Base 2Tx8b (2XE)
CL-Base 2Tx10b (2XE)
CL-Base 2Tx12b (2XE)
CL-Base 3Tx8b (1X3)
For more information about the Camera Link interface specification, refer to the GenICam
standard.
For minimum integration time for different camera types at different Camera Link modes and
output pixel clocks, see section 9.11.4.
4.6 Black-level correction and shading (flat-field) correction
The allPIXA pro camera supports black-level (offset) and shading correction.
The following points are important for understanding these kinds of operation:
Both operations are based on pixel-by-pixel calculation, and the effects on behavior of
single pixels such as PRNU (photo response non uniformity) is eliminated.
Both operations are carried out separately for every line (red, green, blue).
The allPIXA pro camera offers four data sets for black-level correction and four data sets
for shading correction Therefore, you could deal with, for example, four different lighting
systems by selecting the necessary data sets without transferring or generating new
shading data.
Calculation of the correction data sets can be done offline on scanned images.
Often, shading data have been calculated internally with a static white reference in front
of the camera. In this case, spots of dust on the white reference lead to vertical lines in
the image. This effect can be eliminated by slightly defocusing the lens during the
generation of the references. The lighting distribution is then seen by the sensor and the
lens. Another possibility to avoid this problem is to move the target slightly at the
balancing process. In this way, distortions, for example by dust, may also be eliminated.
The allPIXA pro provides offline calculation of the references. You can select a scanned
image and define a region of the image, in which shading correction data should be
calculated. By averaging over a higher number of lines, distortions, for example by dust
on the target, are eliminated. Therefore, it is possible to use an image with a moving
white object.
The allPIXA pro camera also permits to generate shading and offset data internally.
Generated data sets may be stored to the hard disk of the PC. The stored data can be
transferred to the camera later on.
