A scalable MPEG-4 wavelet-based visual texture compression system with optimized memory organization

Low memory implementation of generic hierarchical transforms for parent–children tree (PCT) production and its application in image compression

“…The great memory consumption by the GHTs or the GHTbased codecs has become a major bottleneck for the popularity of GHT-based image coding systems, especially if they are to be implanted to low capacity platforms, such as the chips of cell phones and digital cameras. Although these years have witnessed the transition of research focus from higher reconstructed image quality for a given bit-rate to efficient implementations of coding systems on specific platforms [8,10,[20][21][22], the exploration is by no means enough.…”

“…There is a vast amount of literature on low-memory implementation of DWT, which falls loosely into three categories by the sample feeding modes, namely, the linebased (or scan-based) approaches [8,[23][24][25][26][27][28], the blockbased approaches [10,21,22,[29][30][31] and the novel scan order approaches [32,33]. Since data acquisition devices usually utilize sequential sensors, the line-based feeding is the most common one and has been implemented in hardware [27,28,34].…”

“…No reloading of samples is needed. Our work essentially generalizes Parisot's scan-based approach [24,26], Lafruit's block-based approaches [21,22,29] and Xu's memory-constrained wavelet transform (MCWT) [25] from the DWT to the GHT. By analyzing the dataflow in different decomposition levels of the GHT, we also provide a precise closed-form temporal relationship between the input samples and the subband coefficients, by which the correctness of the proposed approach is strictly proved.…”

Characterization of Wavelet-Based Image Coding Systems for Algorithmic Fault Detection

“…In this paper, one of the first implementations of a wavelet-based image coding system, proposed by IMEC, has been used. Although more optimized implementations have been developed [13] [14], the chosen one is still valid to characterize the faulty behaviour of a practical transform, as it includes all the basic functionality, while keeping complexity within reasonable limits. The block diagram of the system is shown in Fig.…”