Experiments with a Lossless JPEG Codec

Experiments with a Lossless Jpeg Codec

Comparative investigation of a non-linear predictive codec versus JPEG lossless compression

A non-linear predictive coding based algorithm is proposed in the paper for lossless image compression. The algorithm uses two neighbouring pixels, one left and the other top, as a pioneering block to search for the best matched blocks inside a pre-defined window. The corresponding pixels associated with the best matched blocks are then taken to produce the predictive value, together with the t...

Fast Codec Design and Implementation using WHT and R-D Optimization in Wireless Handset

An image compression codec based on WHT is proposed and implemented in wireless handset. Considering the low processing power of wireless handset, fast decoding codec is proposed and implemented. The proposed codec consists of RCT, WHT transform, quantization using R-D optimization and lossless coding. The test results for wireless handsets show that the proposed codec has a better performance ...

Benchmarking and hardware implementation of JPEG-LS

The JPEG-LS algorithm is one of the recently designated standards for lossless compression of grayscale and color images. In this paper, simulation results for lossless and near lossless compression of various image types are presented in order to explore the algorithm’s effectiveness for a number of applications. A hardware implementation using VHDL is proposed and the schematic of a JPEG-LS c...

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 ...