What does a watermark look like?

The text copyright or website address in the picture are watermarks, which are divided into the original picture and the pseudo original watermark. The original watermark is the copyright made by the model himself or the photographer and the website management in the original image. Pseudo original collected these pictures for other websites and forums, and added watermark information such as the LOGO website of his own website.

The embedded watermark information is hidden in the host file, which does not affect the visibility and integrity of the original file. Watermark can provide complete and reliable evidence for the ownership of information products protected by copyright.

Classification of watermark

1, divided by characteristics

Digital watermarking can be divided into robust digital watermarking and fragile digital watermarking. Robust digital watermarking is mainly used to identify copyright information in digital works, such as author and serial number of works. It requires that the embedded watermark can withstand various common editing processes; Fragile digital watermarking is mainly used for integrity protection. Contrary to the requirement of robust watermarking, fragile watermarking must be sensitive to signal changes, and people can judge whether the data has been tampered with according to the state of fragile watermarking.

2. According to the media attached to the watermark.

Digital watermarking is divided into image watermarking, audio watermarking, video watermarking, text watermarking and grid watermarking of three-dimensional grid model.

3, according to the detection process.

Digital watermarking can be divided into plaintext watermarking and blind watermarking. The plaintext watermark needs the original data in the detection process, while the blind watermark detection only needs the key, not the original data. Generally speaking, plaintext watermarking is robust, but its application is limited by storage cost.

The embedded watermark information is hidden in the host file, which does not affect the visibility and integrity of the original file. Watermark can provide complete and reliable evidence for the ownership of information products protected by copyright.