Similar images compression based on DCT pyramid multi-level low frequency template
Medical imaging applications produce a huge amount of similar images. Instead of compressing each image individually, set redundancy compression (SRC) methods remove the inter image redundancy and reduce storage. However, in the previous SRC methods - MMD, MMP and Centroid methods, the prediction templates for extracting set redundancy are not very efficient, especially when image sets are very large with several clusters. In this paper, inspired by face recognition techniques, a novel lossless SRC method is derived based onDCT pyramid multi-level low frequency template. The approximation subband is used as a prediction template for each image to calculate the residue. Intra prediction is also used to reduce the entropy of the residues. Experiments with 3 sets of MR brain images demonstrate the efficiency of our proposed algorithm in respect to bits/pixel (bpp).