Research And Implementation Of Histogram Based Secure Digital Watermarking Algorithm

Nowadays,with the growth of digital information,digital watermarking technology has already become an important technology of digital copyright authentication and integrity protection.However,the traditional digital image watermarking technology cannot recover the original carrier image after the watermark is embedded,which is not applicable to the special field requiring high-quality image.Reversible watermarking technology is to solve the problem,can achieve the carrier image lossless recovery,at the same time,can ensure the complete extraction of watermark information,therefore,reversible watermarking technology is a hot topic of current research.In this paper,the research on histogram based digital watermarking algorithm is as follows:1.A new algorithm for large capacity histogram digital watermarking is proposed.Two bin of histogram are used to embed the watermark information composed of "-1,0" to improve the capacity of embedded watermark.In the process of watermark embedding,the following embedding rules should be followed.When the first bin is higher than the second bin,the embedded information is 1;When the difference between two bin is less than or equal to 1,the embedded information is 0;When the first bin is lower than the second bin,the embedded information is-1.Experimental results show that the embedded watermark information capacity of the algorithm increases by 60%,which verifies the effectiveness of the algorithm,and the algorithm has a high robustness.2.A reversible digital image watermarking algorithm based on histogram modification is designed.In the process of watermarking the original carrier image,the height before and after the change of histogram bin and the position of pixel point changes are recorded in the table.After the original image is embedded and extracted by watermarking,the image can still be recovered and the original carrier image can be obtained.Experimental results show that the algorithm can restore the embedded watermark image to the original image,which verifies the effectiveness of the algorithm.3.An image watermarking algorithm based on histogram security is proposed.Before watermark embedding,watermark information is encrypted by SM4 encryption algorithm,and then embedded.The extracted watermark information also needs to be decrypted first,and finally we can get the watermark information,ensuring the security of the watermark information.Experimental results show that the security of image and watermark information is guaranteed and the algorithm is secure.