Piecewise Periodized Wavelet Transform and Its Realization, Properties and Applications
WAA '01 Proceedings of the Second International Conference on Wavelet Analysis and Its Applications
Region adaptive spectral transformation for wavelet based color image compression
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
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A new multispectral image compression technique based on the Karhunen-Loeve transform (KLT) and the discrete cosine transform (DCT) is proposed. The quadtree for determining the transform block size and the quantizer for encoding the transform coefficients are jointly optimized in a rate-distortion sense. The problem is solved by a Lagrange multiplier approach. After a quadtree is determined by this approach, a one-dimensional (1-D) KLT is applied to the spectral axis for each block before the DCT is applied on the spatial domain. The eigenvectors of the autocovariance matrix, the quantization scale, and the quantized transform coefficients for each block are the output of the encoder. The overhead information required in this scheme is the bits for the quadtree, KLT, and quantizer representation