Method and apparatus for embedding and erasing video watermark as well as system for processing watermark

Abstract

The embodiment of the invention relates to a method and a device for embedding and erasing a video watermark, and a system for processing the watermark, wherein, the method for embedding the video watermark comprises the following steps: the watermark information is embedded in a macroblock of a frame I, the recovery information is embedded in a skipped macroblock and the recovery information includes the macroblock position information of the watermark embedded in the frame I. The method for erasing the video watermark comprises the following steps: the embedded watermark information is extracted from the frame I, the recovery information is extracted from the skipped macroblock and the recovery information includes the macroblock position information of the watermark embedded in the frame I. The watermark information is embedded or erased in the frame I according to the watermark information and the recovery information. The method, the device and the system effectively guarantee the authentication effect on preventing the intraframe information from being tampered, and realize the erasure of the watermark embedded in the frame I.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a video watermark embedding and erasing method and device, and a watermark processing system. Background technique [0002] Using information hiding technology (such as: digital watermarking technology) to protect and authenticate multimedia information (such as: video, audio or image, etc.) is a hot spot in current research. In order to protect or authenticate multimedia information, a watermark can be embedded in the multimedia information. By detecting the watermark information embedded in the multimedia information, it can be known whether the multimedia information has been tampered with by an unauthorized party. Embedding watermarks essentially modifies the original information, and for some special application environments (such as: medical applications, military applications, or applications as evidence in court), it is necessary to restore the original information...

AI Technical Summary

Problems solved by technology

[0004] The inventor found in the process of implementing the present invention that at least the defects of the prior art are: the prior art only embeds the watermark in the SKIP macroblock of the P frame of the video image, The I frame is not protected. Since the number of SKIP macroblocks that meet the conditions in the P frame is limited, there is no watermark embedded in most areas of the frame, and the authentication effect of preventing tampering in the frame is difficult to guarantee; in addition, the existing technology is changing the SKIP macroblock. When using luminance coefficients, although the macroblocks with the smallest luminance coefficients are selected through statistical macroblock counting to modify the luminance coefficients; however, the modification of the luminance coefficients of these macroblocks will still affect subsequent frames, and the watermark in the multimedia information is not real. erasure

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