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In this paper, we propose an efficient spatial domain deringing algorithm using quadtree (QT) decomposition and block-shift filtering (BSF). The ringing artifacts are located through the QT decomposition of an image down to the 4times4 block size. The blocks with suspicious ringing are then replaced with the weighted average of itself and pixel-by-pixel shifted neighboring blocks. The block shifting...
We propose a computationally simple yet effective image/video deblocking algorithm based on block level postfiltering. Each image block is shifted in the range of half of the block dimension to find the candidate blocks for smoothing. The Mean Absolute Error (MAE) between the central image block and the block indicated by a shifted window is used as a criterion to determine if the corresponding shifted...
We propose a perceptually-adaptive motion compensated temporal filtering (MCTF) method to enhance the visual quality of 3D wavelet video coding schemes with spatial-domain MCTF. In our scheme, a spatio-temporal masking model in image domain is incorporated into the lifting structure of MCTF. The model is used to guide the motion search and the prediction step in MCTF so as to remove the visual redundancy...
In this paper, we did research on the relationship between rate and distortion for mpeg-4 FGS enhancement layer. During the course of research on the relationship between rate and distortion of meg-4 FGS enhancement layer, we found that there are big discrepancy between the real data and the RD model based on Laplacian distribution. And what's more, the higher the rate is, the larger the error is...
Laplacian distribution has been widely used to characterize the distribution of DCT coefficients. But in our research, we found that there are big discrepancy between the real data and the distortion model based on Laplacian distribution. And what's more, the higher the rate is, the larger the distortion is. In this paper, we proposed a new distortion model based on mixed Laplacian and uniform distributions...
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