Detection method for secondary compression of JPEG image
A technology of secondary compression and detection methods, which is applied in image coding, image data processing, instruments, etc., and can solve problems such as inapplicability, inaccurate estimation, and large amount of calculation.
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[0045] figure 1 Is the general flow chart of the detection process.
[0046] (1) Select the directory to be detected, then read the JPEG images to be detected sequentially from it, judge the image format, skip if it is not in JPEG format, and continue to read the next image.
[0047] (2) Fit the distribution function of the AC coefficient of a JPEG compression by the AC coefficient of the JPEG image to be detected, and obtain an estimate of the distribution function of the AC coefficient of a JPEG compression, denoted as F 1 (x), where x represents the value of the AC coefficient (the value range of x is an integer from -128 to 128).
[0048] (3) Normalize the histogram of the AC coefficient of the JPEG image to be detected, with f 2 (x) represents the normalized histogram of the AC coefficient of the image to be detected. The so-called normalization is to convert the frequency of occurrence corresponding to x to the percentage of the frequency of occurrence, and the normali...
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