Title :
Block-adaptive subband coding of images
Author :
Diab, Chaouki ; Prost, Rémy ; Goutte, Robert
Author_Institution :
Inst. Nat. des Sci. Appl. de Lyon, Villeurbanne, France
Abstract :
An error-free image decomposition/reconstruction method for subband coding is introduced. This method is used for blockwise subband coding. A partitioning algorithm is presented. The image is partitioned into blocks of identical size and then adjacent blocks of similar variances are merged. For each block, an adaptation of the subband number and bit allocation is made. The bit allocation algorithm uniformly distributes the quantization error into subbands and blocks. Examples clearly show that the peak-to-peak signal-to-noise ratio of the reconstructed images is better using the block-adaptive partitioning method than for subband coding of the entire image
Keywords :
encoding; picture processing; bit allocation algorithm; block-adaptive partitioning method; blockwise subband coding; error free method; image decomposition; image reconstruction; peak-to-peak signal-to-noise ratio; picture processing; quantization error; Bit rate; Discrete Fourier transforms; Filtering; Filters; Frequency; Image coding; Image decomposition; Image reconstruction; Partitioning algorithms; Quantization; Reconstruction algorithms; Signal to noise ratio;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on
Conference_Location :
Albuquerque, NM
DOI :
10.1109/ICASSP.1990.115944
