Removal of blocking artifacts in JPEG compressed images using Dual Tree Complex Wavelet Filters for Multimedia on the Web

摘要

The popular international standard for compression, the Joint Photographers Expert Group (JPEG) quite often leads to noticeable discontinuities along the boundaries called the ‘blocking artifacts’. When the image is JPEG compressed the high frequency details of the coded image are mainly contaminated by quantization noise. An estimation of the actual pixel is obtained from the decoded image. The estimated image is denoised using Dual Tree complex wavelet transform (DTCWT), which is a variant of discrete wavelet transform. This transformation ensures approximate shift invariance and directional selectivity properties that are lacking in the traditional wavelet transform.