DocumentCode :
3489441
Title :
Identification of DCT signs for sub-block coding
Author :
Kondo, Hiroshi ; Yamahara, Keiko ; Liao, Jun
Author_Institution :
Kyushu Inst. of Technol., Kitakyushu, Japan
Volume :
2
fYear :
2001
fDate :
2001
Firstpage :
569
Abstract :
Identification of DCT signs for image coding is presented. In the JPEG DCT coding method the sign of the DCT coefficient is included in the coded signal. Usually 0.1~0.2 bit/pixel for the average bit rate is taken for coding these signs. This paper shows these DCT signs can be estimated at the receiver side almost perfectly on the basis of the smoothness cost function, so it is not needed to send this information. The smoothness cost function is the measure of a smooth connection of the sub-block borders. Here as a cost function the absolute squared Laplacian sum is used. And the technique to determine the signs is a genetic algorithm. It gives us an effective solution quickly. The simulation results show that the reconstructed images have adequate picture quality
Keywords :
discrete cosine transforms; genetic algorithms; image coding; image reconstruction; transform coding; DCT sign identification; absolute squared Laplacian sum; genetic algorithm; image coding; picture quality; reconstructed images; smoothness cost function; sub-block coding; Bit rate; Cost function; Discrete cosine transforms; Genetic algorithms; Image coding; Image reconstruction; Information technology; Laplace equations; Signal processing; Transform coding;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal Processing and its Applications, Sixth International, Symposium on. 2001
Conference_Location :
Kuala Lumpur
Print_ISBN :
0-7803-6703-0
Type :
conf
DOI :
10.1109/ISSPA.2001.950207
Filename :
950207
Link To Document :
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