High-dynamic-range image information hiding method

Abstract

The invention discloses a high-dynamic-range image information hiding method. The method is characterized by, in secret information embedding, obtaining three channel values of each pixel point in anoriginal high-dynamic-range image; then, according to each channel value of each pixel point and corresponding 5 index bits, determining an embedding significance bit of information to be embedded ineach channel value of each pixel point; embedding the information in each channel value of each pixel point to obtain a high-dynamic-range image embedded with secret information; in secret informationextraction, obtaining three channel values of each pixel point in the high-dynamic-range image embedded with the secret information; then, obtaining embedding position of information in each channelvalue embedded with the information of each pixel point; and extracting the information from each channel value embedded with the information of each pixel point to obtain a secret information sequence. The advantages are that the method can embed the secret information into the high-dynamic-range image in an OpenEXR format; and when the embedding rate is 30 bits per pixel, the image embedded withthe secret information can still keep high fidelity.

Description

technical field [0001] The invention relates to an image information hiding technology, in particular to a high dynamic range image information hiding method. Background technique [0002] In the field of image processing, dynamic range refers to the logarithm of the ratio of the maximum and minimum luminosity in a digital image. The dynamic range of the real scene is up to 9 orders of magnitude, but the existing low dynamic range (Low dynamic range, LDR) image uses 8bits / color / pixel to store data, and part of the scene information is lost. High dynamic range (High dynamic range, HDR) imaging technology makes up for this deficiency. It uses floating-point data to accurately display the brightness range of real scenes. Imaging and other aspects are increasingly concerned and used. [0003] Information hiding is the use of digital media to hide important information. In recent years, the information hiding technology of low dynamic range images has developed rapidly, but th...

AI Technical Summary

Problems solved by technology

The existing high dynamic range image information hiding algorithms can be divided into two categories. The first category sacrifices image quality for a higher embedding rate. The embedding rate of the existing top algorithms is only higher than 5 bits per pixel (5bpps). ; The second type can achieve lossless embedding of information, but the embedding rate is lower than 0.2 bits per pixel (0.2bpp)

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