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In accordance with the recent improvement in the quality of image displays for consumer electronics, digital image compression artifacts are visible than ever. Noise removable methods are key issues not only in research areas such as image sensing and satellite imaging but also in consumer electronics such as television signal conversion, DVD and Blu-ray encodings. Among various compression artifact...
Recently, the opportunity to treat still images has increased, and a lot of devices such as laptop displays and digital cameras have been developed, therefore, a large amount of data is stored and is transmitted after a compression. One of the most famous international standards for still image compression is JPEG, in which the DCT (Discrete Cosine Transform) is processed and the DCT coefficients...
In Japanese mobile broadcasting, the H.264 compression standard is used. In spite of the high compression efficiency of H.264, the mobile broadcast channel is very narrow for sending high quality pictures. In the H.264 system, the deblocking filter is adopted in order to reduce blocky noise. However, when the channel is narrow, the deblocking filter degrades the picture sharpness enormously. In this...
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