A high capacity video steganography based on intra luma and chroma modes.

With the High Efficiency Video Coding (HEVC) becoming a popular video coding standard in the world, combing the HEVC standard with data hiding methods is a complex task. In this paper, we propose a video steganography method based on intra luma and chroma prediction modes for HEVC. Concerning the characteristics of the quadtree partition and the correlation between the intra luma and chroma prediction modes, we modify the intra chroma prediction modes to embed secret messages. In order to improve the security and embedding efficiency of the method, we use the Logistic chaotic sequence to preprocess the secret messages, and then use matrix coding to select appropriate parameters to embed the messages. The experimental results demonstrate that the proposed method maintains a significant embedding capacity across various encoding structures. Furthermore, it achieves an average ΔPSNR of 0.02 dB, indicating excellent concealment performance while ensuring minimal impact on image quality. [ABSTRACT FROM AUTHOR]