Test Image Two (Moving Gradient) - Basler L800k User Manual

Operation and Features

3.10.4 Test Image Two (Moving Gradient)

Test image two is formed with a gray scale gradient that ranges from 0 to 255 and repeats every
256 pixels as shown in Figure 3-18. The gradient starts at 0 and steps up, that is, the gray value
of pixel 1 is 0, the gray value of pixel 2 is 1, the gray value of pixel 3 is 2, and so forth.
The pattern shifts by one pixel each time the ExSync signal or the camera's internal control signal
cycles. On the second cycle, the gray value of pixel 1 is 1, the gray value of pixel 2 is 2, the gray
value of pixel 3 is 3, and so forth. On the third cycle, the gray value of pixel 1 is 2, the gray value
of pixel 2 is 3, the gray value of pixel 3 is 4, and so forth. This shifting of the gradient makes the
pattern appear to be moving as the ExSync signal or the internal control signal cycles.
When you view the output of a camera that is set for test image two, the pattern should appear to
be gradually moving up the screen. This feature is useful for determining if the camera is receiving
an ExSync signal from your frame grabber and if the frame grabber is receiving every line that is
output from your camera.
Figure 3-18: Formation of Test Image Two
Figure 3-19: Test Image Two
The description above of the pixel values in test image two is only valid when the
camera is set for an 8 bit output mode and the gain, gain balance, offset and offset
balance parameters are all set to 0 and shading correction is disabled.
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