ABSTRACT
This chapter discusses a post-filtering technique which reduces the color bleeding artifacts commonly encountered in block-based transform coded pictures and enhances visual quality performance of picture coding systems. It describes a post-processing algorithm that removes the color bleeding distortion in discrete cosine transform-coded color images. The chapter presents an overview of existing digital color video formats, and the psycho visual properties related to color image compression. It examines a thorough analysis of the color bleeding phenomenon, as a result of both quantization and decimation of chrominance data. The chapter explains an adaptive post-filtering algorithm is developed, based on the previous analysis. It provides a thorough analysis of the color bleeding artifacts caused by standard digital image and video coding algorithms. The chapter considers how both decimation and quantization operations are involved in the manifestation of the color bleeding distortion. A new post-filtering algorithm for the reduction of color bleeding artifacts is then proposed, that efficiently improves color fidelity.
