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Coding method for high dynamic range (HDR) image compatible with low dynamic range (LDR) and decoding method thereof

A technology of image encoding and decoding methods, which is applied in image communication, television, electrical components, etc., and can solve problems such as large loss of brightness components

Inactive Publication Date: 2013-11-13
GUANGDONG UNIV OF TECH
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Problems solved by technology

A drawback of Ward's method is the large loss of brightness components

Method used

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  • Coding method for high dynamic range (HDR) image compatible with low dynamic range (LDR) and decoding method thereof
  • Coding method for high dynamic range (HDR) image compatible with low dynamic range (LDR) and decoding method thereof
  • Coding method for high dynamic range (HDR) image compatible with low dynamic range (LDR) and decoding method thereof

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Embodiment Construction

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] refer to figure 1 , the present invention provides a kind of HDR image coding method compatible with LDR, comprises the following steps:

[0024] Step S001: converting the original HDR image into an LDR image through tone mapping;

[0025] Step S002: re-read the LDR image converted by tone mapping and perform inverse tone mapping to obtain a processed HDR image;

[0026] Step S003: converting the original HDR image and the processed HDR image from RGB...

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Abstract

The invention discloses a coding method for a high dynamic range (HDR) image compatible with a low dynamic range (LDR). The method includes 1 converting an original HDR image into an LDR image through tone mapping conversion; 2 re-reading the LDR image obtained through the tone mapping conversion and conducting reverse tone mapping to obtain a processed HDR image; 3 converting the original HDR image and the processed HDR image from the RGB (red, green and blue) format into the YCbCr format respectively; 4 calculating the YCbCr component difference between the original HDR image converted into the YCbCr format and the processed HDR image to obtain redundancy information and conducting image compression on the redundancy information; 5 utilizing the compressed redundancy information as an application mark and storing the information into the LDR image obtained through the tone mapping conversion. By means of the method, the redundancy information is utilized as the application mark of the LDR image obtained through the tone mapping conversion and is stored, the information of the original HDR image is reflected truly, the HDR image can be normally displayed on an LDR display, and the effect that the HDR is compatible with the LDR can be achieved. A decoding method for the image is further disclosed.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an LDR-compatible HDR image coding method and a decoding method thereof. Background technique [0002] The full name of HDR (High-Dynamic Range) image is a high dynamic range image, which is different from the format of ordinary image storage. Ordinary JPEG and BMP images use 8-bit integer data to save a single channel component, such as RGB, each component uses 8-bit data to save, and a single pixel has a total of 24 bits. Compared with JPEG, the advantage of HDR images is that each channel is represented by a floating point number, and each channel is stored in 32 bits, so that the dynamic range of the picture can be preserved to the greatest extent. [0003] Due to its superior characteristics such as high contrast ratio, HDR images have high expectations from all walks of life as a direction for the development of next-generation images. However, there are some difficulties ...

Claims

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Application Information

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IPC IPC(8): H04N7/26
Inventor 蔡述庭尹明王钦若张小波
Owner GUANGDONG UNIV OF TECH
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