Reversible data hiding method for high dynamic range image

A high dynamic range, data hiding technology, applied in image data processing, image data processing, instruments, etc., can solve the problem of small embedding amount

Active Publication Date: 2014-09-03
SHANDONG UNIV
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  • Reversible data hiding method for high dynamic range image
  • Reversible data hiding method for high dynamic range image
  • Reversible data hiding method for high dynamic range image

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Embodiment Construction

[0117] The present invention is described in detail below in conjunction with accompanying drawing:

[0118] Each pixel of the LDR image is represented by a 24-bit integer. In RGB mode, the three channels of R, G, and B are represented by 8 bits respectively. In other words, LDR images can only represent a small dynamic range. For an HDR image, each pixel needs to be represented by a 96-bit floating point number, and each channel of the corresponding RGB needs to be represented by a 32-bit number. In order to reduce the storage space of HDR images, scholars such as Greg Ward proposed the brilliant RGBE format. By replacing the mantissa of the exponent, each pixel occupies a 32-bit integer format, in which the color channels R, G, B and the common index channel E each occupy 32 bits. 8 bits.

[0119] Without loss of generality, it is assumed that P(r,g,b) represents a 96-bit HDR image in floating point form, and (R,G,B,E) represents a 32-bit RGBE image. The conversion relatio...

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Abstract

The invention discloses a reversible data hiding method for a high dynamic range image. The reversible data hiding method comprises a data embedding process and a data extracting process, wherein the data extracting process is inverse operation of the data embedding process, and the data embedding process comprises the following steps of converting a rgb image into an RGBE image, and dividing to-be-embedded data into three parts in sequence for embedding the three parts into rgb three channels corresponding to the RGBE image; dividing all pixels of a certain embedding channel of the rgb three channels into two types: S1 and S2, dividing the corresponding embedded data into two types corresponding to S1 and S2, wherein in an embedding process, one type of data is embedded to S1, and then the same process is repeated for embedding the other type of data to S2. The reversible data hiding method disclosed by the invention achieves a purpose of embedding more data by sacrificing least image quality. Compared with the existing reversible HDR (high dynamic range) image hiding algorithm, the hiding algorithm disclosed by the invention improves hiding capacity simultaneously when guaranteeing reversible hiding, and guarantees a better visual effect.

Description

technical field [0001] The invention relates to a reversible data hiding method for high dynamic range images, in particular to a high dynamic image as a data hiding carrier, which is transmitted through an open channel (such as a network) to achieve concealed transmission of embedded information. Background technique [0002] Many users send messages easily and quickly over the Internet. However, malicious attackers will illegally obtain and transmit information through the network, which leads users to seek better information security transmission methods. Like cryptography, information hiding also achieves the purpose of securely transmitting information. Information hiding embeds key information into inconspicuous media files (such as images, texts, audio, and videos), making it difficult for attackers to determine the existence of embedded information. Usually, we refer to media files without embedded information as original carrier files, and files embedded with key ...

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Application Information

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IPC IPC(8): G06T1/00
Inventor 张伟张海峰田天刘侃宫世杰瞿晨非樊承柱
Owner SHANDONG UNIV
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