Low Bandwidth JPEG-XR Transform Design and its System Verification

• Main Authors: Sheng-Wei Fan, 范勝崴
• Other Authors: Jiun-In Guo, Ph. D
• Format: Others
• Language: en_US
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/57886076491834641648

碩士 === 國立中正大學 === 資訊工程研究所 === 99 === As a new generation image compression standard, there are many advantages in JPEG-XR, including high compression ratio twice than JPEG, lower complexity than JPEG-2000 with slight degradation of image quality, higher support, and etc. Since all block-based algorithms will have the blocking effect problem which is sensitive to human eyes, JPEG-XR proposed an algorithm named Photo Overlap Transform (Pre-filter) to solve this problem. There are three modes in pre-filter, and each of them has different corresponding reduction effects. If we process the macroblocks by the raster scan order and one MB in each pipeline stage, the huge memory access for doing the POT-2 mode which has the best reduction will lead to high memory bandwidth problem so as to reduce the throughout. Therefore, in this thesis we propose three low bandwidth techniques to decrease the data access in the overlapping area between MBs. Our proposed design can reduce 72% memory bandwidth when compared to the conventional method. At operating frequency of 117MHz, the proposed design could support the real-time processing for videos with resolution up to Full-HD@30fps.