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Tone mapping method based on edge preservation total variation model

An edge-preserving and tone-mapping technology, applied in the field of image processing, which can solve problems such as increasing smoothness, halo phenomenon in LDRimage, and blurring of image edges.

Active Publication Date: 2013-02-20
SUN YAT SEN UNIV
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Problems solved by technology

However, increasing the smoothness, the edges of the image will be blurred
This makes the LDR image obtained by this method appear halo phenomenon

Method used

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  • Tone mapping method based on edge preservation total variation model
  • Tone mapping method based on edge preservation total variation model
  • Tone mapping method based on edge preservation total variation model

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Embodiment Construction

[0028] 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 creative efforts fall within the protection scope of the present invention.

[0029] The invention overcomes the shortcoming that the tone mapping method based on fast bilateral filtering may produce halo phenomenon, and proposes a tone mapping method based on an edge-preserving full variation model. The Total Variation regularization model was proposed by Rudin, Osher and Fatemi in 1992 to remove noise in images. The model has two fundamental properties: one is that it is able to preserve the edges of the image, and it does so well under ce...

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Abstract

The invention discloses a tone mapping method based on an edge preservation total variation model. The method includes: inputting a high dynamic image; conducting light intensity reconstruction on the input high dynamic image; obtaining a logarithm value of the reconstructed light intensity value; using an edge preservation total variation filter to filter the obtained logarithm value of the light intensity value to obtain an image base layer; enabling the logarithm value of the light intensity value to deduct the image base layer to obtain an image detailed layer; calculating a compression scale factor and image output light intensity; and enabling the compressed light intensity to divide the input image light intensity to obtain a new scale factor M. The scale factor M is acted on a red channel, a green channel and a blue channel respectively to obtain a color-compressed image. The color-compressed image is corrected through gamma to obtain a low-dynamic image. By means of the tone mapping method based on the edge preservation total variation model, the high-quality low-dynamic image can be obtained, and a phenomenon of halo can not occur.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a tone mapping method based on an edge-preserving full-partition model. Background technique [0002] High dynamic range image (HDR image) can support a very large light intensity range, can effectively store light intensity information in the real world, and present super high-quality images to people. However, conventional display devices and printers cannot display these high dynamic images. Because the contrast they can display is much smaller than that of high dynamic images. In order to solve this problem, it is currently possible to compress the dynamic range of high dynamic images to adapt to low dynamic image display devices. The method of converting a high dynamic image into a low dynamic image (LowDynamic Range image, LDR image) like this is the tone mapping method. [0003] Now, a large number of tone mapping methods have been proposed. The simplest contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N11/04
Inventor 周凡苏卓张宗伟
Owner SUN YAT SEN UNIV
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