Title :
Non-linear scale-selection for image compression improvement obtained by perceptual distortion criteria
Author :
Kopilovic, Iván ; Szirányi, Tamás
Author_Institution :
Dept. of Image Process. & Neurocomput., Veszprem Univ., Hungary
Abstract :
The effect of linear and nonlinear diffusions prior to the Joint Photographic Experts Group (JPEG) standard baseline compression is analysed and compared. We shall show that anisotropic diffusion acts as an adaptive filtering that extracts and preserves the important visual information, and it will be shown how it can be used as a preprocessing method for compression artefact reduction. The selection of the appropriate preprocessing parameters at a specified bit-rate greatly reduces the compression artefacts. The selection criteria were determined using a perceptual error metric based on a model of the human visual system
Keywords :
adaptive filters; data compression; feature extraction; filtering theory; image coding; image resolution; nonlinear filters; JPEG standard; Joint Photographic Experts Group; adaptive filtering; anisotropic diffusion; baseline compression; compression artefact reduction; human visual system; image compression; nonlinear scale selection; perceptual distortion criteria; perceptual error metric; preprocessing method; visual information extraction; Adaptive filters; Data mining; Filtering; Image coding; Image processing; Noise shaping; Nonlinear distortion; Nonlinear equations; Smoothing methods; Transform coding;
Conference_Titel :
Image Analysis and Processing, 1999. Proceedings. International Conference on
Conference_Location :
Venice
Print_ISBN :
0-7695-0040-4
DOI :
10.1109/ICIAP.1999.797594
