Color Image Reversible Digital Watermarking Method Based on 3D Prediction Error Histogram

Abstract

The invention discloses a color image reversible digital watermarking method based on a three-dimensional prediction error histogram. The method comprises steps: a watermark is embedded and extracted; through changing a prediction error group mapping relationship in the three-dimensional prediction error histogram, mapping with large embedding distortion is abandoned, mapping is divided into mapping whose embedding distortion is no more than 2 and mapping whose embedding distortion is no more than 1, and a reversible watermark is embedded in a new mapping relationship rebuilding method. Distortion of the image can be avoided to a certain degree, and the PSNR of the image is improved. The method can be used for hiding of secret information; and through applying a double-layer embedding scheme based on a diamond prediction model and building the prediction error group mapping relationship different from the previous one, 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 a color image reversible digital watermarking method based on a three-dimensional prediction error histogram. Background technique [0002] In recent years, in the fields of military, medical, remote sensing image processing and other fields, scholars have analyzed and studied the original image, and proposed a reversible watermarking technology by adjusting the information of the human eye to the insensitive area in the image. After extracting the watermark, the original image can be restored without error. The current research on reversible digital watermarking mainly focuses on grayscale images, and only a few research results are related to color images. [0003] However, in real life, more color images are encountered, and the traditional three-dimensional prediction error histogram reversible digital watermarking algorithm does not make full use of the redunda...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a color image reversible digital watermarking method based on a three-dimensional prediction error histogram, aiming at solving the problem that the traditional three-dimensional prediction error histogram reversible digital watermarking algorithm fails to make full use of the redundancy between the color channels of the color image to obtain better algorithmic performance

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