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Low-illumination image enhancement method and device and image processing equipment

An image enhancement and low-illumination technology, applied in the field of digital images, can solve the problem that the low-illumination image enhancement scheme cannot be adaptively adjusted to increase the level, etc.

Active Publication Date: 2019-05-21
CHINA MOBILE COMM LTD RES INST +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-illuminance image enhancement method, device and image processing equipment to solve the problem that the low-illuminance image enhancement scheme in the prior art cannot adaptively adjust the increase level

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  • Low-illumination image enhancement method and device and image processing equipment
  • Low-illumination image enhancement method and device and image processing equipment
  • Low-illumination image enhancement method and device and image processing equipment

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[0077] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0078] The present invention aims at the problem that the low-illuminance image enhancement scheme in the existing technology cannot adaptively adjust the increase level, and provides a low-illuminance image enhancement method, such as figure 1 shown, including:

[0079] Step 11: Obtain the brightness index parameter value of the image to be processed;

[0080] Step 12: When the brightness index parameter value is lower than a first preset threshold, according to the brightness index parameter value, obtain the control parameter value of the brightness enhancement function;

[0081] Step 13: Perform brightness enhancement on the image to be processed according to the control parameter value.

[0082] The low-illuminance image enhancement method provide...

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Abstract

The invention provides a low-illumination image enhancement method and device and image processing equipment, and the method comprises the steps: obtaining a brightness index parameter value of a to-be-processed image; when the brightness index parameter value is lower than a first preset threshold value, obtaining a control parameter value of a brightness enhancement function according to the brightness index parameter value; and performing brightness enhancement on the to-be-processed image according to the control parameter value. According to the scheme, the brightness of the image can beautomatically detected, so that the image enhancement level is adaptively adjusted, that is, the darker the image brightness is, the higher the stretching degree is, and the brightness of the image with normal illuminance is not changed; full-automatic processing of the image enhancement process is achieved, and image brightness enhancement parameters do not depend on manual adjustment any more; moreover, the image enhanced by the scheme is not excessively enhanced and is not locally noisy. The problem that in the prior art, a low-illumination image enhancement scheme cannot be adjusted in a self-adaptive mode to increase the grade is well solved.

Description

technical field [0001] The invention relates to the technical field of digital images, in particular to a low-illuminance image enhancement method, device and image processing equipment. Background technique [0002] At present, the schemes of image enhancement mainly include: (a) method based on Retinex theory (computational theory of color constant perception); (b) method based on RGB equal proportional gain; (c) a method proposed in patent application number 201310590343.3 Low-light image enhancement method. The Retinex theory believes that an image can be decomposed into the product of the illuminance image and the reflection image. The brightness of the image is determined by the illuminance image and the reflection image. The illuminance image is related to the light source. In the application, the illuminance component needs to be removed to obtain the real image color. Based on the theory of RGB proportional gain, any color image can be composed of different proport...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 温建伟
Owner CHINA MOBILE COMM LTD RES INST
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