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5.11
Test Images
Test images are generated in the camera FPGA, independent of the image sensor. They can be
used to check the transmission path from the camera to the acquisition software. Independent
from the configured grey level resolution, every possible grey level appears the same number
of times in a test image. Therefore, the histogram of the received image must be flat.
A test image is a useful tool to find data transmission errors or errors in the access
of the image buffers by the acquisition software.
The analysis of the test images with a histogram tool gives gives a flat histogram
only if the image width is a multiple of 1024 (in 10 bit mode) or 256 (in 8 bit
mode).
5.11.1
Ramp
Depending on the configured grey level resolution, the ramp test image outputs a constant
pattern with increasing grey level from the left to the right side (see Fig. 5.41).
Figure 5.41: Ramp test images: 8 bit output (left), 10 bit output (right)
5.11.2
LFSR
The LFSR (Linear Feedback Shift Register) test image outputs a constant pattern with a
pseudo-random grey level sequence containing every possible grey level that is repeated for
every row. The LFSR test pattern was chosen because it leads to a very high data toggling rate,
which stresses the interface electronic and the cable connection.
In the histogram you can see that the number of pixels of all grey values are the same.
Please refer to application note [AN026] for the calculation and the values of the LFSR test
image.
5.11.3
Troubleshooting using the LFSR
To control the quality of your complete imaging system enable the LFSR mode, set the camera
window to 1024 x 1024 pixels (x=0 and y=0) and check the histogram. The camera window can
also be set to a multiple of this resolution (e.g. 2048 x 2048 or 4096 x 3072) if the camera
model supports this resolution. If your image acquisition application does not provide a
real-time histogram, store the image and use an image viewing tool (e.g. ImageJ) to display
the histogram.
5.11 Test Images
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Содержание DR1-D3360-192-G2-8
Страница 1: ...MAN071 03 2015 V1 0 Photonfocus MV1 D3360 G2 Camera Series CMOS camera with GigE interface...
Страница 10: ...3 How to get started GigE G2 Figure 3 3 PFInstaller components choice 10...
Страница 22: ...4 Product Speci cation Figure 4 1 Photonfocus D3360 GigE camera series with C mount lens 22...
Страница 76: ...5 Functionality 76...
Страница 92: ...6 Hardware Interface 92...
Страница 112: ...9 Warranty 112...
Страница 114: ...10 References 114...
Страница 117: ...B Camera Revisions B 1 General Remarks This chapter lists differences between the revisions of the camera models 117...
Страница 119: ...C Document Revision History Revision Date Changes 1 0 March 2016 First version 119...