Creation Method of High-Definition Image using DCT Sign Index

概要

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The purpose of this study is to propose a new creation method of high-resolution images using DCT. Images enlarged with image interpolation method blur due to the lack of high-frequency components. Super-resolution method is important in improving the sense of resolution of such images. In the proposed method, high-frequency components of images enlarged with bi-linear interpolation are restored to refine the enlarged images. Restoring high-frequency components is implemented by each focused block on the enlarged image. Since the high-frequency components of the focused blocks are lacked, they are searched from a database by means of DCT sign index. Here, the database is learned from multiple nature description images in advance. In addition, the DCT sign index used for search is generated from signs of DCT coefficient of the low-frequency components of the focused blocks. The proposed method made fast search of the database possible with the use of the DCT sign index. From many simulation results, the proposed method is proved effective.