8.Features
© 2023 China Daheng Group, Inc. Beijing Image Vision Technology Branch 119
ME2L-204-76U3M/C(-L)-F02
BayerRG8/Mono8: 368, BayerRG10/Mono10: 737
ME2L-505-36U3M/C
BayerRG8/Mono8: 27254, BayerRG10/Mono10: 27567
ME2L-830-22U3M/C
BayerRG8/Mono8: 32483, BayerRG10/Mono10: 32729
Table 8-2 Camera exposure delay range
8.3.
Basic Features
8.3.1.
Gain
The MERCURY2 USB3 Vision camera can adjust the analog gain, and the range of analog gain as shown
in section 4 General Specification. When the analog gain changes, the response curve of the camera
changes, as shown in Figure 8-35. The horizontal axis represents the output signal of the sensor in the
camera, and the vertical axis represents the gray value of the output image. When the amplitude of the
sensor output signal remains constant, increasing the gain makes the response curve steeper, and that
makes the image brighter. For every 6dB increases of the gain, the gray value of the image will double.
For example, when the camera has a gain of 0dB, the image gray value is 126, and if the gain is increased
to 6dB, the image gray will increase to 252. Thus, increasing gain can be used to increase image
brightness. When the environment brightness and exposure time keep constant, another way to increase
the image brightness is to change the camera's digital gain by modifying the lookup table, for more details
please see section 8.4.5. Note that increasing the analog gain or digital gain will amplify the image noise.
Figure 8-35 The cameras response curve
8.3.2.
Sensor Bit Depth
By setting the "Sensor Bit Depth", the user can change the bit depth of the sensor output data. Reducing
the sensor bit depth improves the camera frame rate, and increasing the sensor bit depth improves the
image quality.
The sensor bit depth function is associated with the pixel format. When the pixel format is 8bit, the sensor
bit depth can be selected as BPP8 or BPP10. When the pixel format is 10bit, the sensor bit depth only
supports BPP10. When the pixel format is 12bit, the sensor bit depth only supports BPP12. The sensor bit
depth depend on the monochrome or color camera model. The following table shows the sensor bit depth
supported by the camera.