| Functionality | 37
Figure 32: LFSR (linear feedback shift register) test image
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. If your frame grabber application does not provide a real-time
histogram, store the image and use a graphic software tool to display the histogram.
In the LFSR (linear feedback shift register) mode the camera generates a constant pseudo-random test pattern
containing all grey levels. If the data transmission is error free, the histogram of the received LFSR test pattern will
be flat. On the other hand, a non-flat histogram indicates problems, that may be caused either by the cable, by the
connectors or by the frame grabber.
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