Watermarking algorithm based on DCT domain of video frame

Abstract

The invention discloses a watermarking algorithm based on a DCT domain of a video frame, and comprises a video watermark embedding method and a video watermark extraction method. The watermarking algorithm has the characteristic of adaptive embedding intensity, and videos of different sizes can have appropriate intensities, thus video quality and robustness can be compromised, especially when video scale is changed, the effect is especially good, and a step of judging whether the frame is suitable for hiding watermark improves the visual quality of a video including a watermark; only suitable key frames are extracted, so that the robustness of a system is improved, and the extraction speed is accelerated; besides, the brightness, saturation adjustment, fuzzy and other attacks also have a good robustness; under the circumstance of not reducing the accuracy, a digital segmented embedding method greatly improves a watermarking capacity, and as long as the number of times that a certain number appears satisfies a certain preset condition, the number can be taken as a final result without extracting all key frames of the video, so that the operation time can be reduced.

Description

technical field [0001] The invention relates to a watermark algorithm based on video frame DCT domain. Background technique [0002] In recent years, it has become more convenient for people to distribute multimedia works such as videos through the Internet. However, pirates can also obtain other people's original works easily and without distortion through the Internet. The pirates make any profit by duplicating and distributing the original work, which will bring huge economic losses to the copyright owner of the work. For copyright owners with massive video resources such as TV stations and video websites, the loss will be even greater. [0003] In the field of information security, digital watermarking technology can embed the copyright owner's information into the video, and the owner's information can still be extracted or detected under certain artificial or necessary attacks. Therefore, digital watermarking can be used for copyright authentication and piracy track...

AI Technical Summary

Problems solved by technology

There are also methods to decode each frame of the video stream and then embed a watermark in it. This type of method lacks the ability to adaptively adjust the embedding strength for videos of different sizes, which often results in a decrease in video quality or robustness.