Myoungjin Kim, Beomsu Kim, Mincheol Hong
(School of Electronic Engineering, Soongsil University, Seoul156-743, Korea)
Abstract：This research paper recommends the point spread function (PSF) forecasting technique based on the projection onto convex set (POCS) and regularization to acquire low resolution images. As the environment for the production of user created contents (UCC) videos (one of the contents on the Internet) becomes widespread, resolution reduction and image distortion occurs, failing to satisfy users who desire high quality images. Accordingly, this research neutralizes the coding artifact through POCS and regularization processes by: 1) factoring the local characteristics of the image when it comes to the noise that results during the discrete cosine transform (DCT) and quantization process; and 2) removing the blocking and ring phenomena which are problems with the existing video compression. Moreover, this research forecasts the point spread function to obtain low resolution images using the above-mentioned methods. Thus, a method is suggested for minimizing the errors found among the forecasting interpolation pixels. Low-resolution image quality obtained through the experiment demonstrates that significant enhancement was made on the visual level compared to the original image.
Key words：discrete cosine transform (DCT); projection onto convex set (POCS); image resolution
CLD number： TN911.73 Document code： A
Article ID： 1674-8042(2013)01-0030-04doi： 10.3969/j.issn.1674-8042.2013.01.007
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