Self-adaptive reversible digital watermarking method based on integer transformation

Abstract

The invention discloses a self-adaptive reversible digital watermarking method based on integer transformation. The method comprises the steps of watermark embedding and watermark extraction. The step of watermark embedding is double-layer self-adaptive watermark embedding through image block division and block selection. The method comprises the following steps that original images are divided into blocks, the sub-blocks are divided into two parts of a shadow collection and a blank collection, and the shadow collection is embedded firstly; the pixel X of each shadow block is regarded as an embedding unit, the local variance of each shadow block is calculated, the shadow blocks are classified and the smoothness of the shadow blocks is judged; after completion of embedding of the shadow collection, the pixels of the blank collection are predicted by using the embedded pixels so as to complete watermark embedding of a blank spot layer; and embedding of the shadow collection and the blank collection is completed and then the images are merged so that a gray scale image IW after watermark embedding is obtained and the process of watermark embedding is completed. Distortion of the images can be avoided, and the PSNR of the images can be enhanced on the basis of guaranteeing the embedding capacity so that less image distortion under the same embedding capacity can be realized.

Description

technical field

[0001] The invention belongs to the technical field of digital watermarking, in particular to an adaptive reversible digital watermarking method based on integer transformation. Background technique

[0002] In recent years, in the fields of military, medical, remote sensing image processing, etc., scholars have analyzed and studied the original image, and proposed a reversible watermarking technology by adjusting the information of the human eye for the insensitive area in the image; after extracting the watermark, the original Images can be restored without error.

[0003] The reversible digital watermark of traditional integer transformation cannot flexibly choose the size and embedding method of the embedded block according to the specific situation of the image. Contents of the invention

[0004] The purpose of the present invention is to provide an adaptive reversible digital watermark method based on integer transformation, aiming at solving the pro...

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