A Lossless Image Compression Using Integer Wavelet Transform With a Simplified Median-edge Detector Algorithm

In this paper, we propose a lossless (LS) image compression technique integrating a the integer wavelet transform with a prediction step that is a simplified version of the median edge detector algorithm used with JPEG-LS. First, the image is transformed using the prediction step and a difference image is obtained. The difference image goes through an integer wavelet transform and the transform coefficients are used in the lossless codeword assignment. The algorithm is simple and test results show that it yields higher compression ratios than competing techniques. Computational cost is also kept close to competing techniques. Index Term— Lossless image compression, integer wavelet transform, median edge detector, Joint Photographic Experts