With the rapid development of agricultural information technology, the security of agricultural information data has become a hot issue. The safety of ensuring the transmission of important agricultural information on the Internet in agricultural informatization was studied in this paper. By hiding the content and existence of information, the purpose of secure transmission of information can be achieved. HEVC (High-Efficiency Video Coding), the latest video coding standard jointly developed for ISO/IEC and ITU-T. An optimized differential expansion information hiding method based on HEVC video is proposed. In order to enable the algorithm achieving large-capacity steganography and restoring the original video without distortion, the motion vector coefficient pair is taken as the carrier, the information hiding is performed by reducing the difference expansion coefficient. And the least significant bit of the motion vector after steganography is replaced by the secret information to achieve double embedding. On the extraction side, after the complete extraction of information, the original video can be restored without distortion. Experimental results show that this method is compared with the difference expansion method, the PSNR of the video after steganography is increased by 4db, and the bit rate is reduced by 0.7. It can be seen that this method has good visual imperceptibility. It is important that the embedded capacity has been increased by nearly 35% than DE method. The purpose of large capacity steganography is achieved. In the extraction end, the embedded secret information can be accurately extracted and the original video can be recovered without distortion. This is of great significance for the secure transmission of important agricultural information.
展开▼
