복호화된 H.236 영상의 화질 향성 기법 = Image Enhancement Technique for Decoded H.263 Image

다국어 초록 (Multilingual Abstract)

In this paper, we proposed a technique for minimizing blocking effects and mosquito noises which are major causes of image degradation in H.263-based transmitted images. Since the blocking effects occur in the uniform region like background and the mosquito noises occur in the non-uniform rigion like edge neighborhood, we proposed an algorithm to divide image into uniform and non-uniform regions and a filtering algorithm that is adequate for each noise. To reduce the blocking effects, 4-pixel non-linear filter is proposed to get the better performance in both subjetive and objective respect. 5-pixel median filter is used for reducing mosquito noises. In simulation result, the proposed method shows higher PSNR of 0.02~1.01dB and better subjective test, results in comparison with existing methods.