Color Image and Video Compression Based on Direction Adaptive Partitioned Discrete Wavelet Transform

摘要

The main objective of this study is to use the Direction-Adaptive Partitioned Block Transform (DA-PBT) for compressing the color images and videos. It is same as the direction-adaptive block transform but it also have an additional direction-adaptive block partitioning to improve energy concentration. The selection of a directional mode determines the transform direction that provides directional basis functions. It reduces complexity and more efficient coefficient ordering for entropy coding. For image coding, the DA-PBT significantly outperforms the directional DCT. As a block transform, the DA-PBT can be directly incorporated into the prediction-based video coding standards to work with the block-based intra prediction as well as the block-based motion-compensated interframe prediction. The performance of the DA-PBT is compared with the 2D-DCT by using the Peak-Signal-to- Noise Ratio (PSNR) and Compression Ratio (CR). The experimental results shows that the DA-PBT performs well than the 2D-DCT.