17-12 Reduction of Blocking Artifact in JPEG Coded Images using Pinned Sine Transform

Abstract

In this paper, we propose the reduction method of blocking artifact in the JPEG coded image using Pinned Sine Transform (PST). As a block noise reduction method, the Zero-Masking method which is adjusting some speci c DCT coefficients to 0 was proposed in the past. It has a problem that the block boundary fails by this noise reduction method. Our proposed method maintains information on the block boundary by PST, and prevents the block boundary from failing by its noise reduction. By using PST, the blocking artifact can be reduced without generating some new boundary between processed blocks even if the coefficient of the frequency domain is changed. As a reduction effect of blocking artifact, the score of SSIM of the proposed method has improved compared with the conventional Zero-Masking method and the subjectively image quality has also improved well.