A High Dynamic Range Image Compression Method Based on Hybrid Tone Mapping Algorithm

A high dynamic range, high dynamic image technology, applied in video processing and image fields, can solve problems such as poor image contrast, unnatural image brightness, and incomplete image detail preservation, and achieve the effect of enhancing information quality.

Inactive Publication Date: 2017-07-04
XIDIAN UNIV
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Problems solved by technology

However, this method has some shortcomings in the preservation of image color information and image naturalness.
Finally, through research, it is found that most of the compression methods exist, the preservation of image details is not complete, the overall contrast of the image is not good, the brightness of the image is unnatural, and a series of problems such as color distortion of the reconstructed low dynamic image

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  • A High Dynamic Range Image Compression Method Based on Hybrid Tone Mapping Algorithm
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  • A High Dynamic Range Image Compression Method Based on Hybrid Tone Mapping Algorithm

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Embodiment Construction

[0057] refer to figure 1 , the implementation steps of the present invention are as follows:

[0058] Step 1: Input Image

[0059] Input an image in .hdr format (HDR) that cannot be displayed clearly on a common low dynamic display device.

[0060] Step 2: Generation of image brightness information:

[0061] In order to maintain the integrity of image color information reconstruction, here we only compress the brightness information of the image, first we get its brightness information from the original high dynamic color image,

[0062] Lworld=0.27·R+0.67·G+0.06·B

[0063] Among them, Lworld is the brightness information of the high dynamic image, and R, G and B are the pixel values ​​of the R, G, and B color channels of the input high dynamic image.

[0064] Step 3: Global linear mapping algorithm based on image content:

[0065] The global tone mapping algorithm can very well reconstruct the overall effect of the image. Among them, the linear mapping algorithm has rece...

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Abstract

The invention belongs to the technical field of image and video processing, and particularly discloses a high dynamic range image compression method based on a mixed tone mapping algorithm. According to the high dynamic range image compression method, the problem about image distorsion when a high dynamic image displays on general display equipment is mainly solved. The high dynamic range image compression method comprises the following steps: firstly, using global linear compression based on image types to save the integral effect of the image; secondly, further enhancing the naturalness of the image by using an adaptive avoiding and value burning technology; finally, improving the visibility of image detailed information by using a local tone mapping algorithm based on a dual-side filter. According to the high dynamic range image compression method disclosed by the invention, a natural distinct low dynamic image result can be obtained; the high dynamic range image compression method can be widely applied to relevant fields of image and video processing.

Description

technical field [0001] The method belongs to the technical field of image and video processing, and particularly relates to a compression method of a high dynamic range image (HDR-high dynamic range image), which can be used for displaying a high dynamic range image on an ordinary low dynamic display range device, specifically a method based on mixed tone High Dynamic Range Image Compression Method for Mapping Algorithms. Background technique [0002] High dynamic images are very rich in layers, and can obtain light and shadow effects that are closer to reality than ordinary images. Therefore, high dynamic images have great application value in satellite meteorology, medical treatment, military and other fields. Therefore, in recent years, high dynamic range Images are getting more and more attention. The dynamic range of an image refers to the ratio between the brightness value of the brightest pixel and the brightness value of the darkest pixel in an image. There are oft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T9/00G06T5/00
Inventor 郑喆坤焦李成王晓珂房莹崔玉孙天
Owner XIDIAN UNIV
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