An interpolation method based on two-step approach model for bad point in Bayer color image

For the charge coupled device camera that adopts Bayer color filter array can only record single channel information of gray value from red, green or blue; it has to estimate the others by using the method of interpolation to achieve the process of color reduction. In order to improve the quality of images, it needs to modify the bad pixels before color reduction. In this article, it proposed an interpolation method based on two-step approach model for bad pixels in Bayer color image. It firstly modified the four neighboring pixels which in the same channel with the bad pixel, and then calculate the gray value of bad pixel by using bilinear interpolation method. Through this method, it made a better use of the information of pixels near the bad pixel, and effectively improved the accuracy of estimation for bad pixels.