For digital images described by 8-bit gray level, background prediction can be applied as the correction algorithm to detect and correct the defective pixels existing in the image, the correction can be completed based on FPGA and d imaging devices such as DVI and VGA. In this paper, we applied an improved background prediction that employs median filter as defective pixels prediction, with the median filter results to correct point defective pixels, while square root analysis is employed to correct block ones with improvements of background reset and iteration. Results show that the proposed background prediction can correct the defective pixels of captured images effectively.
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