Edge Adaptive Prediction for Lossless Image Coding
DCC '99 Proceedings of the Conference on Data Compression
BIBE '04 Proceedings of the 4th IEEE Symposium on Bioinformatics and Bioengineering
Lossless Image Compression Based on DPCM-IWPT
CCCM '08 Proceedings of the 2008 ISECS International Colloquium on Computing, Communication, Control, and Management - Volume 01
An improved SPIHT algorithm for lossless image coding
Digital Signal Processing
A fast VQ codebook generation algorithm via pattern reduction
Pattern Recognition Letters
A Hybrid Lossless Compression Scheme for Efficient Delivery of Medical Image Data over the Internet
ICCMS '10 Proceedings of the 2010 Second International Conference on Computer Modeling and Simulation - Volume 01
Image Lossless Compression and Secure Transmission System Based on Integer Wavelet Transform
MMIT '10 Proceedings of the 2010 Second International Conference on MultiMedia and Information Technology - Volume 01
The LOCO-I lossless image compression algorithm: principles and standardization into JPEG-LS
IEEE Transactions on Image Processing
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In this paper, a low bit-rate lossless image coding scheme based on Classified Vector Quantization with Orthogonal Polynomials Transform (OPT) has been proposed. In this work, two vector quantization codebooks VQ1 and VQ2 are used to encode the smooth and edge blocks separately. The proposed scheme divides each input image to be encoded into small blocks and classifies them in spatial domain since it reduces the classification complexity. The smooth blocks are encoded using VQ1 codebook and Adaptive Differential Pulse Code Modulation (ADPCM), so as to provide good response to the non-stationarity of the input data. The edge blocks are vector quantized using VQ2, the OPT is applied on the code vector of edge blocks to obtain transformed coefficient matrix and are encoded with code vector index. The Orthogonal Polynomials Transform maximizes the Energy Packing Efficiency (EPE) which is equivalent to minimizing the Mean Square Error (MSE) in terms of step response. The proposed lossless coding scheme gives better results when compared with existing lossless encoders.