All-In-One Usb3.0 Interface Camera - Daheng Imaging VENUS USB3 User Manual

The relative position of the ROI and the image is shown in Figure 8-46.
Figure 8-46 An example for the relative position between the ROI and the current image

Auto White Balance Adjustment
Auto White Balance function calculates the white balance coefficient based on the data in ROI, and then
use the coefficient to adjust the components of the image, in order to make the R/G/B component the
same in the ROI. The Auto White Balance feature is only available on color sensors.
The auto white balance can be set to "Once" or "Continuous" mode. When using the "Once" mode, the
camera just adjusts the white balance ratio once, when using the "Continuous" mode, the camera
continuously adjusts the white balance ratio based on the data in AWBROI.
The auto white balance feature can also select the color temperature. When the color temperature of the
selection is "Adaptive", the data in ROI always adjusting the red, green and blue to the same. When
selecting the specific color temperature, the camera adjusts the factor according to the light source, so
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.

8.3.5.2. All-in-one USB3.0 Interface Camera

Auto white balance of cameras is performed by software, so it has a certain impact on the acquisition
performance. It only supports "Once" mode and "Manual" mode (auto white balance off mode)

Auto White Balance ROI
Auto White Balance feature use the image data from AWBROI to calculate the white balance coefficient,
and then each component of the image is processed according to the calculated coefficients.
ROI is defined in the following way:
AWBROIWidth＝640
AWBROIHeight＝480
100
50
ROI
640
AWBROIOffsetX: The offset of the X axis direction.
AWBROIOffsetY: The offset of the Y axis direction.
© China Daheng Group, Inc. Beijing Image Vision Technology Branch
480
ROI
1024
8.Features
1000
104