Research On Reversible Hiding Algorithm Of JPEG Image Based On Sorting Selection Of DCT Coefficients

With the rapid development of the Internet and its open state,many new Internet technologies have emerged to improve the quality of human life.Faced with the emergence of various new Internet technologies,effective methods are also needed to solve the security problems of Internet information transmission.Information hiding technology to protect users' own safety has become one of the security problems that researchers urgently need to study and solve.Information hiding technology is to secretly embed important information into multimedia digital information such as audio,video,and images in an invisible way.Currently,most researches on information hiding technology are based on the analysis and design of reversible information hiding algorithms for JPEG images.However,information hiding methods based on JPEG images usually need to compress image files,which makes the compressed image files have less redundant information for researchers to embed secret information.While it is difficult to embed high-capacity secret information,the size of image files will increase after the secret information is embedded.To solve the above problems,this paper proposes a feasible and effective method for reversible information hiding of JPEG images.In this scenario:1.Perform Discrete Cosine Transform on all 8×8 sub-blocks in JPEG images,and quantize the coefficients obtained after transformation to generate DCT(Discrete Cosine Transform)coefficients that are convenient for research and design of information hiding algorithms.This paper rearranges the DCT coefficients into a new matrix for algorithm design and realization.The design proposed in this paper simulates the AC coefficients in the quantized DCT coefficients at the same frequency and embeds the secret information bits.Through the experimental comparison of the original carrier image and the camouflage image,the preferred choice is to produce a smaller distortion frequency for the test carrier image file The AC coefficients are embedded in secret information generated randomly.2.When embedding secret information,select appropriate AC coefficients for tembedding,and reduce the invalid bitstream extension based on the decoding matrix generated by the rearranged new matrix.The experimental results show that the hiding method designed in this paper can get better JPEG image visual quality and less image file bitstream extension under the same quality factor and the same bitstream embedded in the carrier image.