An Efficient Codec of 2D Adaptive Directional Lifting based SPL5/3 with Improved SPIHT Algorithm for Lossless Image Coding

Lifting is an efficient algorithm to implement the discrete wavelet transform in order to overcome the drawbacks of the conventional wavelet transform that does not provide a compact representation of edges which are not in horizontal and vertical directions. The lifting scheme provides a general and flexible tool for the construction of wavelet decompositions and perfect reconstruction filter banks. It has been adopted in JPEG 2000. The paper follows this research line, novel 2 D Adaptive Directional Lifting based on SPL 5/3 has analyzed, structured and tuned with improved SPIHT based on adaptive coding for lossless JPEG 2000 image coding. The proposed 2D-ADL scheme incorporates the directionally spatial prediction into the conventional lifting based on 5/3 wavelet transform and forms a novel, efficient and flexible lifting structure with proposed scaling coefficients. In order to obtain better compression on image edge, an improved Set Partitioning In Hierarchical Trees (ASPIHT) algorithm based on prior scanning the coefficients around which there were more significant coefficients was replaced with conventional SPIHT. Although, the proposed 2DADL based on SPL5/3 scheme followed by ASPIHT codec significantly reduce edge artifacts and ringing and outperforms the conventional 1D lifting scheme followed by SPIHT upto 8.4 dB as reported. Keywords— Adaptive Directional Lifting, SPL 5/3, JPEG 2000, Image Coding, ASPIHT, SPIHT, Compression, PSNR, MSE.