Flat-field-correction method for image taken by a fiber optic taper coupled CCD camera
Image taken by a fiber optic taper coupled CCD camera system characterizes the great difference among its pixels responsivity. This difference will obviously degrades image quality and makes it difficulty to get a clear image. The flat field correction method especially for the system mentioned above is a very useful method to get a better clear image. The flat field correction method includes three steps:1.A black background image is firstly obtained from such a system under the certain temperature and integration time; 2.The image which will be treated as a reference image for flat field correction should be taken under uniformity irradiation as possible and the same temperature and integration time;3.Subtracting the black background image from the reference image will obtain an important lookup table image and can calibrate each pixels responsivity to get a clear image. In our works, some images with very big PRNU problem are processed by the flat field correction method and the good result can be obtained.