High-safety JPEG image steganography method
A high-security, image technology, applied in the field of high-security JPEG image steganography, can solve the problems of no model or solution, different degrees of importance, unreasonable distortion functions, etc., to achieve good image quality and ensure security , to ensure the effect of image quality
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[0020] Example one
[0021] figure 1 This is a flowchart of a high-security JPEG image steganography method provided in the first embodiment of the present invention. Such as figure 1 As shown, the method mainly includes the following steps:
[0022] Step 11. Obtain the quantization rounding error of each quantized discrete cosine transform DCT coefficient in the transform domain in the JPEG image compression process, and the quantized DCT coefficient x before and after rounding i With X i ;.
[0023] The DCT coefficient includes a direct current coefficient and an alternating current coefficient. After the DCT transformation is performed according to the 8×8 block, the coefficient at the upper left corner of the 8×8 block is the DCT direct current coefficient, and the remaining 63 coefficients are all DCT alternating current coefficients.
[0024] In addition, the quantized DCT coefficient x before and after rounding i With X i The relationship between can be expressed as: X i =roun...
Example Embodiment
[0038] Example two
[0039] In order to facilitate the understanding of the present invention, the following is attached figure 2 The present invention is further introduced. Such as figure 2 As shown, the method mainly includes the following steps:
[0040] Step 21: Obtain the quantized rounding error of each quantized discrete cosine transform DCT coefficient in the transform domain in the JPEG image compression process, and the quantized DCT coefficient x before and after the rounding i With X i ;.
[0041] The DCT coefficients include DC coefficients and AC coefficients. After DCT transformation is performed according to 8×8 blocks, the upper-left coefficient of the 8×8 block is the DCT DC coefficient, and the remaining 63 coefficients are all DCT AC coefficients.
[0042] In addition, the quantized DCT coefficient x before and after rounding i With X i The relationship between can be expressed as: X i =round(x i ), which means X i To get the closest x i Integer.
[0043] Step 22...
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