기술사 (Journal of the Korean Professional Engineers Association)
- 제22권2호
- /
- Pages.19-25
- /
- 1989
시각 하중 이산여현변환 영상부호화
Image Coding of Visually Weighted t Discrete Cosine Transform
초록
Utilizing a cosine transform in image compression has several recognized performance benefits, resulting in the ability to attain large compression ratio with small quality loss. Also, various models incorporating Human Visual System (HVS) to Discrete Cosine Trans-form (DCT) scheme are considered. Using the exact frequency components of DCT basis function, the optimum modulation transfer function (MTF) is obtained analytically. The errors at a block boundary which is important factor in transform coder are criteria for error measurement. The HVS weight coding results in perceptually higher quality images compared with the unweighted scheme.
키워드