Signal adaptive postprocessing for reducing blocking effects in JPEG imageJPEG 영상에서의 블럭화 현상제거를 위한 신호적응 후처리 기법

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In this thesis, an algorithm is introduced to reduce the blocking artifacts of JPEG (Joint Photographic Experts Group) images. Reconstructed images from JPEG compression produce highly noticeable degradation near the block boundaries, called discontinuity adjacent blocks, because each block is transformed and quantized independently. Therefore, the reduction of blocking effects is a central issue in the post processing for better image quality. In order to reduce the blocking effects, we propose an algorithm consists of two stage enhancement procedures. At the first stage, an image is classified into two areas, i.e., an edge area and a relatively monotone area, according to the image intensity gradient by using a local adaptive threshold scheme. At the second stage, the staircase noise along the edge is smoothed by 1-D directional filter according to four directions of the edge, and the grid noise in the monotone area is smoothed by a signal adaptive lowpass filter. The comparison study between the proposed algorithm and other algorithms is performed computer simulation with several JPEG images. We represent some examples of processed images, PSNR (Peak Signal to Noise Ratio) figures, and histogram characteristics to demonstrate the significant improvement on the subjective and objective views.
Advisors
Park, Hyun-Wookresearcher박현욱researcher
Description
한국과학기술원 : 정보및통신공학과,
Publisher
한국과학기술원
Issue Date
1996
Identifier
107066/325007 / 000937024
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 정보및통신공학과, 1996.2, [ v, 49 p. ]

Keywords

Corner Detect; Signal Adaptive Filter; 영상; 블럭화현상; Outlier; Block effect; JPEG; Image; Postprocessing; 신호적응; 정지영상; 후처리; 영상압축

URI
http://hdl.handle.net/10203/39956
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=107066&flag=dissertation
Appears in Collection
ICE-Theses_Master(석사논문)
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