Enhanced display method for color high dynamic range image

A high dynamic range, enhanced display technology, applied in the fields of computer vision and image processing, to achieve uniform and natural brightness changes, good chroma fidelity, and ensure independence.

Active Publication Date: 2015-05-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fourth problem is that when dealing with color high dynamic range images, it is necessary to consider selecting an appropriate color model or color correction method to reduce image color distortion

Method used

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  • Enhanced display method for color high dynamic range image

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Embodiment Construction

[0021] The following is a specific description through an embodiment.

[0022] Now take an image commonly used in the field of high dynamic range image enhancement (treeUnil.hdr) as an example. The image is a high dynamic range image in hdr format, and the pixel values ​​of 63% of the pixels in this image are all below 0.1. About 2% of the area has a pixel value above 0.9, so the direct display effect is that there are a few bright areas in the overall darkness, and the image information display effect is extremely poor ( figure 2 a). The schematic flow chart of the detailed steps of the present invention is as figure 1 As shown, the specific process is as follows:

[0023] S1. Perform nonlinear correction on the RGB image: first obtain the original color high dynamic range image (treeUnil.hdr), which is a color digital image expressed in RGB space. According to the saturation state of the image, select the nonlinear correction parameter γ and make a nonlinear transformati...

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Abstract

The invention discloses an enhanced display method for color high dynamic range image. The enhanced display method for color high dynamic range image comprises the following steps: executing the nonlinearity correction for the RGB image, building the color image brightness model and extracting the brightness information, building color image chroma model and extracting the chroma information, executing the Retinex filtering operation to the brightness, combining the new brightness with the chroma information and reducing into the RGB image. The method selects the suitable brightness and color model for improving the gray level distribution of the result image and effectively reducing the color distortion problem in the result image, the information included in the high dynamic range image is well recovered by the Retinex filtering operation. The enhanced display method for color high dynamic range image is used for the image enhanced processing unit of the digital camera with HDR function, field surveillance camera and other image collecting device and for the transform processing process for displaying high dynamic range image on the low dynamic range device. The brightness and chroma model of the method is simple and practical, the image is displayed in enhanced mode and the color is kept without distortion.

Description

technical field [0001] The invention belongs to the technical field of computer vision and image processing, and in particular relates to the enhanced display of color high dynamic range images. Background technique [0002] The dynamic range of an image refers to the brightness range of the image. The brightness range can be measured in various ways, for example, it can be represented by the ratio of the brightness of the brightest part to the darkest part in the image. Real-world scenes have a high dynamic range, many exceeding 100,000:1. In the process of sampling and quantizing digital images, a finite number of discrete values ​​(such as 0 to 255) are usually used to represent the brightness at the corresponding pixel, and its dynamic range is limited by the number of all possible discrete pixel values, which etc. Image Depth - The number of bits used to store each pixel in a digital image (typically 8 bits with 256 brightness levels) limits the dynamic range of a dig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/64H04N9/77H04N9/78
Inventor 李永杰高绍兵韩旺旺任燕泽李朝义
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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