Basler L800k, User Manual, Page: 77 / 168

Operation and Features
BASLER L800
k
3-37
Draft
3.10.3 Test Image One (Fixed Gradient)
Test image one is formed with an odd/even gray scale gradient that ranges from 0 to 255 and re-
peats every 512 pixels as shown in Figure 3-16. The odd pixel gradient starts at 0 and steps up,
that is, the gray value of pixel 1 is 0, the gray value of pixel 3 is 1, the gray value of pixel 5 is 2,
and so forth. The even gradient starts at 255 and steps down, that is, the gray value of pixel 2 is
255, the gray value of pixel 4 is 254, the gray value of pixel 6 is 253, and so forth.
At pixels 256 and 257, the gray value for both pixels is 128. At pixels 511 and 512, a white odd
pixel is next to a black even pixel. At pixels 513 and 514, a black odd pixel is next to a white even
pixel. To the human eye, the gradient appears to be a varying gray field with a white vertical line
every 512 pixels.
Test image one is useful for checking the integrity of the data transmitted by the camera. If you
capture lines and examine the pixel values in the captured lines, the values should be exactly as
described above.
Figure 3-16: Formation of Test Image One
Figure 3-17: Test Image One
L
The description above of the pixel values in test image one 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.