JPEG Image Quantization Method with Variable Thresholds 


Vol. 6,  No. 11, pp. 3150-3156, Nov.  1999
10.3745/KIPSTE.1999.6.11.3150


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  Abstract

In this paper, VTQM(Variable Threshold Quantization Method) is proposed, which enhances PSNR by composing the advantages of round off and truncation quantization methods. From vast experiments. PSNR's of JPEG image with the method are compared with that of standard JPEG methods. At the boundary which affects the compression ratio. VTQM quantizes with a new threshold to reduce the length of compressed data; otherwise, VTQM employs the round off quantization method to preserve the original image information. As a result, VTQM reduces bit rate while preserving the image quality. The experimental results show that VTQM enhances PSNR by 0.2~0.3%u33C8. 0.4~0.5%u33C8 with the same bit rate those of the traditional truncation and round-off quantization methods, respectively.

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[IEEE Style]

H. R. Oh, S. H. Yoon, Y. R. Seong, "JPEG Image Quantization Method with Variable Thresholds," The Transactions of the Korea Information Processing Society (1994 ~ 2000), vol. 6, no. 11, pp. 3150-3156, 1999. DOI: 10.3745/KIPSTE.1999.6.11.3150.

[ACM Style]

Ha Ryoung Oh, Seok Hyun Yoon, and Yeong Rak Seong. 1999. JPEG Image Quantization Method with Variable Thresholds. The Transactions of the Korea Information Processing Society (1994 ~ 2000), 6, 11, (1999), 3150-3156. DOI: 10.3745/KIPSTE.1999.6.11.3150.

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