Reversible data hiding method and recovering method
A data hiding and recovery method technology, applied in the field of data hiding, can solve the problems of pixel redundancy, small embedding capacity, and insufficient utilization of multi-extreme value blocks.
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[0079] The invention relates to the technical field of data hiding, in particular to a reversible data hiding method. Reversible data hiding technology means that in the process of digital image processing, watermark information is embedded in the carrier image, and authorized users can extract the watermark information from the image after the watermark is embedded, and at the same time restore it to the original carrier image.
[0080] The inventive idea of the present invention is that after the image is divided into blocks, the pixel grayscale in each block has a maximum value and a minimum value, and for the entire original image, there may be many extreme values, including maximum values and minimum values. When embedding using the first embedding method, only single extreme value pixels in the block are utilized. In order to better utilize the divided pixels with equal extreme values to carry information bits, the present invention proposes a second embedding meth...
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