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Wide dynamic compressing method and device for image

A compression device and wide dynamic technology, applied in the field of image processing, can solve problems such as low contrast, uncontrollable display image contrast, and unsatisfactory

Active Publication Date: 2014-04-02
ZHEJIANG UNIVIEW TECH CO LTD
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Problems solved by technology

This solution cannot control the contrast of the displayed image through parameter adjustment, and sometimes an unsatisfactory low-contrast result is obtained
Moreover, because the algorithm uses a fixed scaling factor for the histogram segment partition, resulting in fixed extremely high and low brightness in the result, the entire image still loses some visibility information

Method used

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  • Wide dynamic compressing method and device for image
  • Wide dynamic compressing method and device for image

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Embodiment Construction

[0031] The invention proposes an image wide dynamic compression scheme based on local contrast preservation. When compressing wide dynamic images, this scheme can effectively improve the visibility of low-brightness and high-brightness details under the premise of maintaining local image contrast, making the image layer richer and approaching the visual effect of human eyes.

[0032] For the image wide dynamic compression device of the embodiment of the present invention, please refer to Figure 5 , logically the device may include: a residual module, a compression module and a fusion module. The residual module is used to obtain the image data of the detail layer; the compression module is used to compress the image data of the base layer and the original image data based on local contrast preservation; the fusion module is used to compress the image data after compression processing and the image data of the detail layer The fusion process obtains wide dynamic compressed im...

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Abstract

The invention provides an image wide dynamic compressing method. The method comprises the following steps: carrying out compression processing on the basis of keeping a local contrast on base layer image data and original image data; carrying out fusing processing on the compressed image data and detail layer image data to obtain image data subjected to wide dynamic compression. In the scheme adopted by the invention, when an image is subjected to wide dynamic compression, on the premise of keeping the local image contrast, visible degrees of details at low-brightness and high-brightness positions can be effectively promoted, the image level is more rich and the visual effect of the image is close to that of human eyes.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an image wide dynamic compression method and device. Background technique [0002] The dynamic range that can be represented by traditional digital images that are widely used at present is very limited, which makes the bright areas in the scene lose details due to overexposure, and the dark areas also lose detail information due to underexposure. The high dynamic range image can represent the brightness information of the high dynamic range in the real world scene. The effect of the human visual system has great application value in the field of video surveillance. However, at present, most conventional display devices only support display output with a low dynamic range, and high dynamic range images are difficult to display on conventional display devices. If they are displayed directly, the image brightness information will be lost, and the human visual expe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/117H04N19/184H04N19/80
Inventor 王智玉李婵朱旭东羊海龙
Owner ZHEJIANG UNIVIEW TECH CO LTD
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