A Reversible Data Hiding Scheme Based on Neighboring DCT Coefficient Difference

• Main Authors: Tsai, Jia-Jin, 蔡嘉晉
• Other Authors: Lin, Yih-Kai
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/87986491161243211994

碩士 === 國立屏東教育大學 === 資訊科學系碩士班 === 102 === In this thesis, we propose a method based on the histogram of differences between each coefficient of discrete cosine transformation and its corresponding coefficient in its neighboring blocks.First, we use the integer DCT coefficients to convert the pixel values of the spatial domain into the coefficients of the frequency domain.Next,we embed secret messages into the DCT coefficients difference of adjacent blocks.Then,we use the method of LSB to embed the informations of overflow into the edge of block. Finally, the image of frequency domain reverse the cover image of spatail domain.We can use the method of adjacent blocks of pixels difference to extract the secret message, and the original image can be restored without distortion. Experimental results show that our method can reduce the overflow.