How to work watermarks?

Often heard of watermarks in the video they also added, but they can defend if they are easy to remove or replace your sign?
June 10th 19 at 16:24
2 answers
June 10th 19 at 16:26
There are different types marking images which is referred to as watermark, but who between them have nothing in common.
Just to take and remove, for example, even a translucent inscription on the picture - it is impossible, because when overlay is loss of information that can be recovered, but only Dodoma missing parts.

But there are other methods that are based on different mathematical operations with the image data. Such modifications cannot be seen with the eye, but if you know that they were made, they can be easily detected. Some of them are detected even if to analyze only a portion of the image or if the image is reduced/enlarged or repainted. Because these algorithms most often associated with the frequency decomposition of the image, for the understanding of their principles need a bit of understanding of this area of mathematics.
June 10th 19 at 16:28
possible without the same characters pictures find

protect on the other - the courts and compensation

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