8.Features
© 2023 China Daheng Group, Inc. Beijing Image Vision Technology Branch 93
Sum: The values of the affected pixels are summed and then output as one pixel. This improves the signal-
to-noise ratio, but also increases the camera’s response to light.
Average: The values of the affected pixels are averaged. This greatly improves the signal-to-noise ratio
without affecting the camera’s response to light.
Considerations When Using Binning
1)
Effect on ROI settings
When Binning is used, the value of the current ROI of the image, the maximum ROI of the image, the auto
function ROI, and the auto white balance ROI will change. The changed value is the original value (the
value before the setting) divided by the Binning factor.
For example, assume that you are using a camera with a 1200 x 960 sensor. Horizontal Binning by 2 and
vertical Binning by 2 are enabled. In this case, the maximum ROI width is 600 and the maximum ROI
height is 480.
2)
Increased response to light
Using Binning with the Binning mode set to Sum can significantly increase the camera’s response to light.
When pixel values are summed, the acquired images may look overexposed. If this is the case, you can
reduce the lens aperture, the intensity of your illumination, the camera’s exposure time setting, or the
camera’s gain setting.
3)
Possible image distortion
Objects will only appear undistorted in the image if the numbers of binned rows and columns are equal.
With all other combinations, objects will appear distorted. For example, if you combine vertical Binning by
2 with horizontal Binning by 4, the target objects will appear squashed.
4)
Mutually exclusive with Decimation
Binning and Decimation cannot be used simultaneously in the same direction. When the horizontal Binning
value is set to a value other than 1, the horizontal Decimation feature cannot be used. When the vertical
Binning value is set to a value other than 1, the vertical Decimation feature cannot be used.
Vertical binning is not available for models associated with MARS-2621/2622.
8.3.12.
Decimation
The Decimation can reduce the number of sensor pixel columns or rows that are transmitted by the camera,
reducing the amount of data that needs to be transferred, reducing bandwidth usage, and increasing the
frame rate.
How Vertical Decimation Works
On mono cameras, if you specify a vertical Decimation factor of n, the camera transmits only every n
th
row.
For example, when you specify a vertical Decimation factor of 2, the camera skips row 1, transmits row 2,
skips row 3, and so on.
