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5.12 Test Images
T r i g g e r
I m a g e W r i t e
I m a g e R e a d
1 2 3
. . .
n
1
. . .
n
1 2 3
. . .
1
. . .
S t a r t R e a d M e m o r y S t a r t R e a d M e m o r y
Figure 5.40: Image Burst
5.12 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).
5.12.1 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)
5.12.2 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.
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