8.Features
© China Daheng Group, Inc. Beijing Image Vision Technology Branch 140
Camera models that support this feature:
Model
ME2P-560-21GC-P
ME2P-900-13GC-P
ME2P-2621-4GM/C-P
The following will describe: FFC coefficient calculation and preview, FFC coefficient reading and saving,
file loading and saving.
8.4.6.1. FFC Coefficient Calculation and Preview
Before the FFC coefficient is obtained, it is recommended to determine the aperture of the lens and the
gain of the camera. In the following cases, the coefficient needs to be re-calculated.
Lens is replaced
If the requirement for FFC accuracy is high (if the purpose is to correct the inconsistency of the pixels),
it is recommended to recalculate the FFC coefficient after modifying the gain of the camera
According to the FFC plugin, the process of obtaining FFC coefficient is shown in the figure below, and the
yellow part are optional steps. For details of the FFC plugin, please see section 9.4.
1. Acquisition Frame Count
2. Acquisition of Bright
Field Images
4. Preview
3. Execute FFC
Figure 8-67 The process of obtaining FFC coefficient
1. Acquisition frame count: frame count of acquisition frames of bright field image.
It is not a necessary step, generally the default value is used
If the image noise is high, it is recommended to increase the acquisition frame count
2. Acquisition of bright field images: perform this function to complete the bright field image
acquisition.
It is recommended to aim at the white paper or the flat fluorescent lamp (to ensure the same
amount of light in different areas of the sensor), and adjust the distance between the camera
and the white paper/flat fluorescent lamp to fill the entire field of view
Do not overexpose the image. The gray value of the brightest area of the brightfield is
recommended to be less than 250
