基于位置直方图的单次JPEG 压缩质量因子检测

doi:10.3969/j.issn.1007-2861.2013.02.003

Journal of Shanghai University（Natural Science Edition） ›› 2013, Vol. 19 ›› Issue (2): 120-125.doi: 10.3969/j.issn.1007-2861.2013.02.003

• Communication and Information Engineering • Previous Articles Next Articles

Quality Factor Estimation for Single JPEG Compression Based on Position Histogram

ZHANG Jun-hua, L¨U Dong-hui

School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China

Received:2012-07-10 Online:2013-04-30 Published:2013-04-30

Abstract

Abstract: This paper proposes a new method for estimation of JPEG (joint photographic experts group) quality factor for images once compressed but saved in the bmp or tiff format. By calculating a gray histogram of the test image, the gray value was set at the maximum of the gray histogram occurs. The test image is split into 8×8 blocks, and a position histogram of the specified gray value g in each 8×8 block is obtained. The position histograms of all blocks are combined to produce a position histogram of the entire image, from which the quality factor of the test image is estimated. Experiments show that the method has a high correct rate. In addition, derivative characteristics of similarity curves of images having undergone single JPEG compression with high quality are analyzed at some high quality factors, and an improved version of a previous method is proposed, and verified in experiments.

Key words: grayscale, JPEG (joint photographic experts group) compression, position histogram, quality factor

CLC Number:

TN 911.73

ZHANG Jun-hua, L¨U Dong-hui. Quality Factor Estimation for Single JPEG Compression Based on Position Histogram[J]. Journal of Shanghai University（Natural Science Edition）, 2013, 19(2): 120-125.

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Quality Factor Estimation for Single JPEG Compression Based on Position Histogram

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