8.Features
© China Daheng Group, Inc. Beijing Image Vision Technology Branch 129
that the hue of the ROI is the same as the hue of the light source. That is: high temperature is cold, low
color temperature is warm.
The auto white balance feature is only available on color sensors.
8.3.6. Test Pattern
The MER-U3 series camera supports three test images: gray gradient test image, static diagonal gray
gradient test image, and moving diagonal gray gradient test image. When the camera captures in RAW10
mode, the gray value of test image is: the pixel gray value in RAW8 mode multiplies by 4, as the output of
pixel gray value in RAW10 mode.
The following three test images are illustrated in the RAW8 mode.
GrayFrameRampMoving
In the gray gradient test image, all the pixels' gray values are the same in the frame. In the adjacent frame,
the gray value of the next frame increases by 1 compared to the previous frame, until to 255, and then the
next frame gray value returns to 0, and so on. A printscreen of a single frame is shown in Figure 8-28.
Figure 8-28 Gray gradient test image
SlantLineMoving
In the moving diagonal gray gradient test image, the first pixel value of adjacent row in each frame
increases by 1, until the last row. When the pixel gray value increases to 255, the next pixel gray value
returns to 0. The first pixel gray value of adjacent column increases by 1, until the last column. When the
pixel gray value increases to 255, the next pixel gray value returns to 0.
In the moving diagonal gray gradient test image, in the adjacent frame, the first pixel gray value of the next
frame increases by 1 compared to the previous frame. So, in the dynamic image, the image is scrolling to
the left. A printscreen of the moving diagonal gray gradient test image is shown in Figure 8-29:
