Operation and Features
BASLER L304
kc 3-55
Draft
3.11.5 Test Image Three (Vertical / Horizontal Gray Gradient)
Test image three consists of two parts. The left 2048 pixels of the image are formed with a vertical
gray scale gradient ranging from 0 to 255 that repeats every 256 pixels as shown in Figure 3-32.
The first pixel in each line has a red value of 0, a green value of 0 and a blue value of 0. The
second pixel has a red value of 1, a green value of 1, and a blue value of 1, and so on.
The right 2032 pixels of the image are formed with a horizontal gray scale gradient ranging from
0 to 255 that repeats every 256 lines. The pixels in the first line in each gradient have a red value
of 0, a green value of 0 and a blue value of 0. The pixels in the second line have a red value of 1,
a green value of 1, and a blue value of 1, and so on.
The starting value of the pixels in the horizontal gradient decreases by one each time an ExSync
or the camera’s internal control signal cycles. When you view the output of a camera that is set
for test image three, the right side of the test pattern appears to be moving down the screen.
Test image three is useful for checking the performance of your frame grabber. First, capture an
image of the test pattern. Next, examine the captured image and find the break point between the
vertical gradient and the horizontal gradient. In each row, there should be 2048 pixels to the left
of the break point and 2032 pixels to the right of the break point. If you find that this is not the case,
your frame grabber settings could be incorrect or the frame grabber could be dropping pixels.
Figure 3-32: Test Image Three
L
The description of the pixel values in test image three is only valid when the camera
is set for 8 bit output. If the camera is set for 10 bit output, the gradients range from
0 to 1023 and repeat every 1024 pixels
To Next Page
Loading...
Need help?
General
