전자공학회논문지S (Journal of the Korean Institute of Telematics and Electronics S)
- 제35S권2호
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- Pages.106-113
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- 1998
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- 1226-5837(pISSN)
동영상 부호화기에서의 적응적 양자화 매트릭스 생성
An adaptive quantization martrix generation in moving image encoder
초록
Quantizer with bit rate control performs lossy compressionin moving image coding. Efficient quantizer can improve subjective quality of reconstructed image at the same bit rate because most of errors are occured at this stage. Although quantization matix of current compression stantards reflects human visual system, the performance of their quantization matrixes is not always optimal because they are not considering each image characteristics. We proposed a new adaptive optimal quantization matrix obtained by considering complexity of each image subblocks. It resulted in improvments of image quality about 0.05-0.82 dB and good subject quality at edge regions when we simulated the quantization method in various coding statndards.
키워드