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Image dehazing method and device and mobile terminal

An image and image input technology, applied in the field of image processing, can solve problems such as color distortion, and achieve the effect of avoiding color distortion

Inactive Publication Date: 2014-11-26
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide an image defogging method, device, and mobile terminal, aiming to solve the problem that the gray areas of the image are prone to color distortion when the mobile terminal provided by the prior art processes images containing a large number of gray areas

Method used

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  • Image dehazing method and device and mobile terminal
  • Image dehazing method and device and mobile terminal

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Embodiment 1

[0052] figure 1 The implementation flow of the image defogging method provided by Embodiment 1 of the present invention is shown, and the details are as follows:

[0053] In step S101, the atmospheric light value of the input image is estimated.

[0054] The prior law of the dark channel is obtained by He Kaiming through statistical induction of a large number of images, which can be simply described as: in a haze-free image that does not contain the sky, for any pixel in the image, the appropriate local window range around it Within , at least one color channel has a low and close to zero brightness value, the formula is:

[0055] J dark = min c ∈ ( r , g , b ) ( min ...

Embodiment 2

[0093] image 3 It shows the implementation process of the image defogging method provided by Embodiment 2 of the present invention, and the details are as follows:

[0094] In step S301, it is judged whether the proportion of pixels whose luminance value is lower than the preset luminance threshold in the dark channel of the input image is smaller than the preset proportion value, if yes, execute step S302, otherwise store the input image.

[0095] In the embodiment of the present invention, the proportion of pixels whose luminance values ​​are lower than the preset luminance threshold in the dark channel of the input image is calculated, if the proportion of pixels whose luminance values ​​are lower than the preset luminance threshold in the dark channel of the input image is If the ratio is less than the preset ratio value, step S302 is executed; otherwise, the input image is considered to be a clear image, and the input image is directly stored in the database.

[0096] S...

Embodiment 3

[0112] Figure 4 A specific structural block diagram of an image defogging device provided by Embodiment 3 of the present invention is shown. For convenience of description, only parts related to the embodiment of the present invention are shown. The image defogging device 4 may be a software unit, a hardware unit, or a combination of software and hardware built in the mobile terminal. The device 4 includes: an atmospheric light value estimation unit 41, a transmittance estimation unit 42, a transmittance optimization unit 43 , transmittance correction unit 44 and image defogging unit 45 .

[0113] Wherein, the atmospheric light value estimation unit 41 is used to estimate the atmospheric light value of the input image;

[0114] The transmittance estimation unit 42 is used to estimate the transmittance of the input image according to the fog imaging model and the dark channel prior law;

[0115] A transmittance optimization unit 43, configured to optimize the transmittance t...

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Abstract

The invention is suitable for the technical field of image processing, and provides an image dehazing method and device and a mobile terminal. The method includes the steps that an atmospheric light value of an input image is estimated; transmittance of the input image is estimated according to a foggy weather imaging module and a dark channel prior rule; the transmittance is optimized to obtain optimized transmittance; the optimized transmittance is modified through a guide filter to obtain a transmission propagation graph; the input image is restored to be a fogless image according to the foggy weather imaging module, the atmospheric light value and the transmission propagation graph. According to the method, when dehazing is carried out on the input image, a transmittance optimization mechanism is introduced, and accordingly the estimated transmittance can be optimized to obtain the optimized transmittance. The dehazing method in which the optimized transmittance is introduced can be suitable for images with a large number of grey areas; when the images are processed, color distortion of the grey areas can be avoided, and the requirement of outdoor photographing of users can be completely met.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an image defogging method, device and mobile terminal. Background technique [0002] Nowadays, due to the impact of the environment, haze weather is becoming more and more common. Under the influence of common bad weather such as fog, the outdoor visual system will usually cause whitening of the image captured by the mobile terminal due to the influence of water droplets in the atmosphere, making the image degraded or even blurred. Processing and information extraction bring greater difficulties. [0003] At present, although the shooting function of the mobile terminal already has a lot of image enhancement processing capabilities, it has not yet specifically integrated the processing capabilities for image clarity in foggy days. Traditional image enhancement algorithms cannot efficiently process images captured in foggy days. Especially when processing im...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 熊胤琪潘腾蛟
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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