| Summary: | 碩士 === 國立東華大學 === 資訊工程學系 === 93 === Abstract
Error concealment is an effective mechanism to reconstruct the missing blocks in an image. In general, missing blocks can be reconstructed by utilizing correct neighboring blocks. If neighboring blocks are also damaged, the reconstructed quality is not satisfactory. In this thesis, we propose an error concealment technique based on ROI (region of interest) embedding. The ROI of image contains the human-interested information and is the most important area. As we know, the JPEG-2000 and MPEG -4 standards support the ROI coding. In our proposed technique, several copies of ROI are embedded into ROB (region of background) for reconstructing ROI in corrupted image. Even if all ROI are damaged, the ROI still can be reconstructed by extracting information embedded in ROB.
Although JPEG-2000 stream of ROI is embedded into ROB, it is invisible to the human eyes. Simulation results show the original image only has a little bit distortion after embedding JPEG-2000 stream of ROI. The reconstructed image also has high visual quality and PSNR value. Compared with traditional techniques, the proposed technique outperforms the existing techniques especially in the performance of ROI.
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