Lossless drift compensation method for invertible video watermark

Abstract

A reversible video watermarking non-destructive drift compensation method includes the following steps: (1) obtaining the I-frame DCT coefficient embedded with watermark after performing DCT transform and quantization to the I-frame in the image group; (2) obtaining I-frame pixel value embedded with watermark after performing inverse quantization and inverse DCT transform to the I-frame DCT coefficient embedded with watermark, subtracting with the original pixel value in the original frame to form a drift compensation value, and outputting to the drift compensation unit for performing the drift compensation to the next video frame; (3) obtaining the movement residual DCT coefficient by performing DCT transform and quantization to the P-frame in the image group after movement estimation and movement compensation, wherein, the P-frame is compensated according to the drift compensation of the former frame, and then forming a compressed video stream embedded with watermark after entropy coding; (4) the P-frame movement residual DCT coefficient after drift compensation and the movement compensation value forming an integrated P-frame pixel value embedded with watermark, subtracting with the P-frame original pixel value in the original frame to form a drift compensation value of the nest P-frame, wherein, the non-destructive drift compensation removal is the corresponding inverse operation. This invention improves the visual quality of video with embedded watermark in the normal decoding, and can restore the video information accurately.

Description

technical field [0001] The invention relates to an improved method of multimedia digital watermark, in particular to a lossless drift compensation method of reversible video watermark. Background technique [0002] The digital information revolution has brought profound changes to human society and life, as well as new challenges and opportunities. Today, graphics workstations, digital cameras, digital video recorders, scanners and other equipment and powerful software have been used by users around the world to create, process and share digital multimedia content and works such as images, audio and video. At the same time, with the vigorous development of network communication technology, the release and exchange of multimedia data is unprecedentedly popular, resulting in a large number of information such as digital video publishing (Digital Video Publications), video-on-demand (Video-On-Demand, VOD) and video conferencing (Videoconferences) video multimedia applications....

AI Technical Summary

Problems solved by technology

This error distorts the subsequent inter-frame coded frame using it as a reference frame, and the distortion has diffusion and cumulative effects, resulting in the video embedded with watermark often cannot obtain satisfactory visual effects. even more so when

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