TRANSMISSION AND WATERMARKING OF VIDEO AND IMAGES

摘要

Methods for embedding and recovering a secure watermark in an encoded video sequence. The video sequence includes intra-coded frames interspersed by predicted frames, wherein the video sequence uses at least one intermittent forced intra refresh block within a sequence of predicted frames. The method includes the step of assigning a meaning (150, 180) to said at least one intermittent forced intra refresh macro block suh that said forced intra refresh macro block meaning acts as a watermark. This provides a means of embedding tamper evident information in a compressed video bit-stream in a way that does not alter the image data ina any way. Thus, no loss of subjective or objective quality is incurred when this method is used. The method is compliant with H.263 standard video compression.