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A linear image enhancement method with dual control functions

A linear image and functional technology, applied in image enhancement, image analysis, image data processing, etc., can solve problems such as loss and over-enhancement details, and achieve the effect of avoiding over-enhancement and natural processing results

Active Publication Date: 2022-05-03
HUAQIAO UNIVERSITY
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Problems solved by technology

[0005] The invention provides a linear image enhancement method with dual control functions, which controls the prominent and detailed parts of the image separately, solves the problems of excessive enhancement and loss of details in the existing histogram equalization method, and the enhancement effect is natural

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  • A linear image enhancement method with dual control functions
  • A linear image enhancement method with dual control functions
  • A linear image enhancement method with dual control functions

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Embodiment Construction

[0023] The present invention will be further described below through specific embodiments.

[0024] figure 1 The flow chart of the linear image enhancement method with dual control function provided by the present invention includes the following steps:

[0025] Step a) Input a digital image, if it is a multi-channel image, its brightness channel is taken as a grayscale image, if it is a single-channel image, it is directly used as a grayscale image; the histogram of the grayscale image is counted to obtain the array h 1 ;The histogram data is scaled to make its mean value 1, the specific operation is: the array h 1 All elements in are multiplied by the gray scale range of the image, and the product obtained is divided by the total number of pixels of the image to obtain the array h 2 , the total number of pixels in the grayscale image can be obtained by multiplying the length of the grayscale image by its width.

[0026] Step b) the array h 2 Perform bidirectional thresho...

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Abstract

A linear image enhancement method with dual control functions provided by the present invention firstly obtains the grayscale image of the input image; counts the histogram of the grayscale image to obtain the array h 1 ; Scale the histogram data so that the mean gray value is 1, and get the array h 2 ; Perform bidirectional threshold truncation processing to get the array h 3 ; Perform linear scaling to get the array h 4 ; Perform normalization processing to get the array h 5 ; Calculate the cumulative distribution array cdf; Calculate the mapping table; Perform table lookup operation on the gray image to obtain the gray enhanced image. The linear image enhancement method provided by the present invention can separately control the detail part and the prominent part of the image, is applicable to various types of images, has low computational complexity and remarkable enhancement effect.

Description

technical field [0001] The present invention relates to, in particular, a linear image enhancement method with dual control functions, which can be used in technical fields such as various types of image and video enhancement. Background technique [0002] In real life, due to the influence of scene conditions, the visual effects of captured images and videos are not good, which requires image enhancement technology to improve human visual effects. [0003] Image enhancement technology can be divided into two categories: algorithms based on space domain and algorithms based on frequency domain according to the different spaces of the enhancement process. Both the linear image enhancement method and the histogram equalization with dual control functions belong to the algorithm based on the space domain, but the histogram equalization often has the problems of over-enhancement and loss of details, and many histogram improvement algorithms that have appeared so far only allevia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T5/40
CPCG06T5/009G06T5/40G06T2207/20208
Inventor 戴声奎钟峥黄正暐高剑萍
Owner HUAQIAO UNIVERSITY
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