Edge-preserving ADPCM and ECVQ coding of image sub-bands using subjective criteria

Author

Jourdan, Marcelo Mollica ; Alcaim, Abraham

Author_Institution

Centro dfe Estudos em Telecomunicacoes, Pontificia Univ. Catolica do Rio de Janeiro, Brazil

Volume

3

fYear

1996

fDate

16-19 Sep 1996

Firstpage

411

Abstract

We propose an adaptive sub-band image coder designed according to subjective criteria. A pre-processing technique is applied to the high subbands and discards local information irrelevant to the overall subjective quality. Pixels not removed by this technique are classified as edges and non-edges by means of a specific algorithm designed for each sub-band. The two classes in each high-frequency sub-band are quantized with entropy constrained vector quantizers (ECVQ). The low sub-band is encoded with an edge-preserving ADPCM. Both in terms of PSNR and visual quality the proposed codec offers meaningful improvements compared to the JPEG algorithm

Keywords

adaptive signal processing; differential pulse code modulation; edge detection; entropy codes; image classification; image coding; vector quantisation; ECVQ coding; JPEG algorithm; PSNR; adaptive subband image coder; edge preserving ADPCM coding; edges; entropy constrained vector quantizers; high frequency subband; high subbands; image subbands; nonedges; pixels classification; preprocessing technique; subjective criteria; subjective quality; visual quality; Algorithm design and analysis; Bit rate; Codecs; Entropy; Image coding; PSNR; Quantization; Redundancy; Telecommunications; Transform coding;

fLanguage

English

Publisher

ieee

Conference_Titel

Image Processing, 1996. Proceedings., International Conference on

Conference_Location

Lausanne

Print_ISBN

0-7803-3259-8

Type

conf

DOI

10.1109/ICIP.1996.560518

Filename

560518