Loop Filtering and Post Filtering in Low-Bitrates Moving Picture Coding, and Subjective and objective Evaluation of Loop filtering and Post filtering 


Vol. 27,  No. 5, pp. 490-505, May  2002


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  Abstract

SWhen an image is highly compressed by using the current coding standards, the decompressed image hasnoticeable image degradations, such as blocking artifacts near the block boundaries, comer outliers at cross points of blocks, and ringing noise near image edges. These image degradations are caused by quantization process of the 88 DCT coefficients. In order to reduce the image degradations, the evaluation of subjective and objective quality of a loop-filtering algorithm and the post-filtering algorithm which was already developed is performed. The developed methods perform an adaptive filtering on the decompressed image according to blocking and ringing flags, which are defined to reduce computation complexity. Performances of both algorithms are compared with respect to the image quality and the computation complexity. The comparison results show that the post filtering is slightly better than or similar to the loop filtering with respect to peak signal to noise ratio (PSNR), whereas the subjective image qualities of both methods are quite similar. However, the computation complexity of the loop filtering is much less than that of the post filtering.

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  Cite this article

[IEEE Style]

Y. Lee and H. Park, "Loop Filtering and Post Filtering in Low-Bitrates Moving Picture Coding, and Subjective and objective Evaluation of Loop filtering and Post filtering," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 5, pp. 490-505, 2002. DOI: .

[ACM Style]

Yung-Lyul Lee and Hyun-Wook Park. 2002. Loop Filtering and Post Filtering in Low-Bitrates Moving Picture Coding, and Subjective and objective Evaluation of Loop filtering and Post filtering. The Journal of Korean Institute of Communications and Information Sciences, 27, 5, (2002), 490-505. DOI: .

[KICS Style]

Yung-Lyul Lee and Hyun-Wook Park, "Loop Filtering and Post Filtering in Low-Bitrates Moving Picture Coding, and Subjective and objective Evaluation of Loop filtering and Post filtering," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 5, pp. 490-505, 5. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880