A
flat field correction method of an
ultraviolet CCD pattern includes the steps that (1) at least five to ten narrow-band flat field images are acquired; (2) the acquired narrow-band flat field images are processed to remove background signals in the images, and the images are combined into one flat field image; (3) components in the flat field image are separated, and the large-scale components and the small-scale components of the flat field image are separated; (4) according to the determined large-scale components and small-scale components, correction flat field images with different ratios R are synthesized; (5) any real observation image is calibrated through the correction flat field images, and the optimum correction flat field image and the corresponding ratio R are determined according to the observation
image signal obtained after calibration; (6) flat
field calibration is performed on the observation image of an
ultraviolet CCD camera through the determined optimum correction flat field image, and correction of the pattern of the
ultraviolet CCD camera is completed.