Method for embedding robust digital watermark in H.264 based on video complexity analysis
A technology of complexity analysis and digital watermarking, which is applied in the direction of digital video signal modification, electrical components, image communication, etc., to achieve the effect of alleviating robustness
Active Publication Date: 2015-03-11
合肥极光科技股份有限公司
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[0006] The purpose of the present invention is to provide a robust digital watermark embedding method based on video complexity analysis in H.264, so as to solve the problem that the robust watermark algorithm in the prior art will forcibly load the watermark in the video part that is not suitable for embedding the watermark
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[0028] (1) Video complexity analysis
[0029] It is assumed that a piece of digital video contains f frames of images, and each frame of images contains m×n pixels. f i is the i-th frame, i∈{0,f-1}. f i During the H.264 encoding operation, it is decomposed into several non-overlapping macroblocks with a size of 16×16, MB i,j is the j-th macroblock in the i-th frame, C i,j,k is the kth pixel of the jth macroblock in the ith frame, k∈{0,p×q-1}. MB per macroblock i,j Subdivided into 16 sub-blocks by 4×4 b i,j,n Perform DCT transformation, b i,j,n Indicates the nth subblock of the jth macroblock in the ith frame. Then zigzag scans the transformed sub-blocks, so that each sub-block produces such Figure 7 DCT coefficients for the 7 subbands shown.
[0030] (a) Image complexity measure
[0031] The present invention defines the image complexity of the pixel macroblock as the comprehensive consideration of background brightness and texture complexity. And set a threshol...
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The invention discloses a method for embedding robust digital watermarks in H.264 based on video complexity analysis. First, based on image complexity analysis, a concept of video complexity analysis is put forward by using that video watermark is characterized by abundant time dimension information, different from image watermark, and image macro blocks having characteristics of high density, complex texture, intense movement, etc. are chosen as characteristic macro blocks. Since a human visual system is not easy to detect changes of characteristic areas in a video frame, watermark information is embedded in the areas and transparency of the algorithm is higher. Based on video complexity analysis, the invention provides a mixed robust watermarking algorithm. In H.264 frame, watermark information is embedded through adjusting residual block layered DCT coefficients, and among the frames, identification information is embedded through adjusting motion vectors of cross-shaped area macro block, thereby effectively alleviating contradiction between video quality and watermark algorithm robustness.
Description
technical field [0001] The invention relates to the field of video watermark methods, in particular to a robust digital watermark embedding method based on video complexity analysis in H.264. Background technique [0002] The research on image watermarking by scholars and research institutions at home and abroad has been perfected, but the research on video digital watermarking is still relatively lagging behind, and a unified evaluation standard has not been established, and it still needs to be mature. However, most of the existing video watermarking algorithms still use image watermarking technology, that is, to load watermarks in the space domain or transform domain, while digital video files not only inherit all the two-dimensional features of digital image files, but also have the third dimension that digital images do not have. Features – time domain features. This also leads to a huge waste of resources for such video watermarking algorithms that directly apply imag...
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IPC IPC(8): H04N19/467H04N19/176H04N19/513
Inventor 蒋建国宜曼齐美彬王慧莉苏京华张国富尤小泉夏娜苏兆品
Owner 合肥极光科技股份有限公司