A High Efficient Coding Method for Bayer Image
We propose a visual lossless compression scheme of mosaic image based on wavelet sub-band substitute.The encoder is designed to separate green components from red and blue components.Firstly,full resolution green image demosiced from raw mosaic image is produced and green mosaic image is near-losslessly coded by LOCO-I scheme designed by Weinberger.After a wavelet transform,the red and blue points are compressed only on compression low frequency sub-band.In the decoder,the high frequency sub-bands of red and blue mosaic component are taken from the high frequency sub-bands of full resolution green image which locate at the same position as raw red or blue mosaic image,so we can reconstruct raw red or blue mosaic image based on decoded low frequency sub-bands of red and blue mosaic component.Compared with JPEG2000,the performance of proposed method is apparently better for low complexity level and high compression ratio.