Title :
Analysis of predictive schemes in pyramidal image coding
Author :
Sanz, Alberto ; MuÑoz, Carlos ; Garcia, Narciso
Author_Institution :
E.T.S. Ing. Telecommun., Univ. Politecnica, Madrid, Spain
Abstract :
A model of the pyramid encoding generation algorithm is introduced, providing an approximation to the pyramid generation algorithm from which a theoretical expression for the expected prediction error can be derived. An expression for the improvement of the prediction error over standard predictive techniques is also obtained. Experimental results are provided, both to check the derived expressions and to test the method on real images. Quantization errors propagate throughout the pyramid, forcing a layer-dependent quantization mechanism, which is demonstrated. Overall results show good reconstructed images for a bit rate around 0.5 bit/pixel
Keywords :
encoding; filtering and prediction theory; picture processing; image coding; layer-dependent quantization mechanism; prediction error; predictive schemes; pyramid encoding; pyramid generation algorithm; Approximation algorithms; Bit rate; Encoding; Image analysis; Image coding; Image reconstruction; Pixel; Predictive models; Quantization; Testing;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1989. ICASSP-89., 1989 International Conference on
Conference_Location :
Glasgow
DOI :
10.1109/ICASSP.1989.266842
