한국정보처리학회논문지 (The Transactions of the Korea Information Processing Society)
- 제6권11호
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- Pages.3150-3156
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- 1999
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- 1226-9190(pISSN)
가변 임계값을 갖는 JPEG 영상의 양자화 방법
JPEG Image Quantization Method with Variable Thresholds
- O, Ha-Ryeong ;
- Yun, Seok-Hyeon ;
- Seong, Yeong-Rak (Dept. of Electronic Eng., Kookmin University)
- 발행 : 1999.11.01
초록
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 images 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 quanity. The experimental results show that VTQM enhances PSNR by 0.2-0.3dB., 0.4-0.5dB, with the same bit rate than those of the traditional truncation and round-off quantization methods, respectively.
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