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Image enhancement method and device, storage medium and terminal

An image enhancement and image technology, applied in the field of image processing, can solve the problems of overall image brightness and color loss, image quality reduction, image brightness loss, etc.

Active Publication Date: 2020-07-07
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing dark channel method has a loss in image brightness, and there is a loss in the overall brightness and color of the processed image, resulting in a decrease in image quality after defogging processing.

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  • Image enhancement method and device, storage medium and terminal
  • Image enhancement method and device, storage medium and terminal
  • Image enhancement method and device, storage medium and terminal

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Embodiment Construction

[0022] As mentioned in the background art, the existing dark channel method has a loss in image brightness, and a loss in the overall dynamic range and color of the processed image, resulting in a decrease in image quality after defogging processing.

[0023] In the technical solution of the present invention, logarithmic transformation is performed on the brightness value of each pixel of the image to be processed, which is beneficial to subsequent mathematical calculations and reduces computational complexity. By performing at least two scales of Gaussian filtering on the brightness logarithm of each pixel, the pixel brightness information of different frequencies in the image to be processed can be retained, and the reflectance at least two scales is weighted and summed, that is, combined with the logarithm Transformation and the processing results of Gaussian filtering at multiple scales can more accurately retain the reflectance information, thereby maximizing the restorat...

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Abstract

The invention discloses an image enhancement method and device, a storage medium and a terminal. The image enhancement method comprises: obtaining a to-be-processed image; determining a brightness value of each pixel in the to-be-processed image, and performing logarithm transformation on the brightness value of each pixel to obtain a brightness logarithm value of each pixel; carrying out Gaussianfiltering of at least two scales on the brightness logarithm value of each pixel to obtain filtering results corresponding to the at least two scales; for each pixel, respectively calculating the difference between the brightness logarithm value and the brightness filtering values of at least two corresponding scales to obtain the reflectivity of the corresponding object position of each pixel under at least two scales; for each pixel, performing weighted summation on the reflectivity under at least two scales to obtain the final reflectivity of the object position corresponding to each pixel; and performing inverse logarithm transformation at least according to the final reflectivity of the object position corresponding to each pixel. According to the technical scheme, the defogging effect can be improved, and the image quality is improved.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an image enhancement method and device, a storage medium, and a terminal. Background technique [0002] For images in harsh scenes such as fog and haze, dehazing processing is required. [0003] In the prior art, a dark channel defogging algorithm is commonly used. A dark channel means that some pixels will always have at least one color channel with a very low value. By processing the dark channel, the effect of defogging can be achieved. [0004] However, the existing dark channel method has a loss in image brightness, and there is a loss in the overall brightness and color of the processed image, resulting in a decrease in image quality after defogging processing. Contents of the invention [0005] The technical problem solved by the invention is how to improve the defogging effect and image quality. [0006] In order to solve the above-mentioned technic...

Claims

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T2207/10024G06T5/73
Inventor 蒋彬
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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