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A nonlinear image enhancement method with dual control function

An image enhancement and non-linear technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as loss and over-enhancement of details, and achieve the effect of over-enhancement and loss of details

Active Publication Date: 2022-07-01
HUAQIAO UNIVERSITY
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Problems solved by technology

Both the dual nonlinear image enhancement method with dual control functions and histogram equalization are algorithms based on space domain, but histogram equalization often has the problems of over-enhancement and loss of details, and many histogram improvement algorithms that have appeared so far, they only alleviate The degree of over-enhancement has been increased, but these two problems have not been fundamentally solved

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  • A nonlinear image enhancement method with dual control function
  • A nonlinear image enhancement method with dual control function
  • A nonlinear image enhancement method with dual control function

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Embodiment Construction

[0025] The present invention will be further described below through specific embodiments.

[0026] refer to figure 1 The flow chart of the nonlinear image enhancement method with dual control function provided by the present invention includes the following steps:

[0027] 1) The input bit is B and the number of series is L=2^B. If it is a multi-channel image, its brightness channel is taken as the brightness image, and if it is a single-channel image, it is directly used as the brightness image; the histogram of the statistical brightness image figure, get the array h 1 ; The histogram data is scaled to make the mean value 1. The specific operation is: the array h 1 All elements in are multiplied by L, and the resulting product is divided by Num to get the array h 2 , Num is the total number of pixels of the brightness image, which can be obtained by multiplying the length of the brightness image by the width;

[0028] 2) put the array h 2 Perform bidirectional clamping...

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Abstract

The present invention provides a nonlinear image enhancement method with dual control functions. First, the brightness image of the input image is obtained; the histogram of the brightness image is counted to obtain an array h. 1 ; The histogram data is scaled so that the mean is 1, and the array h is obtained 2 ; Perform bidirectional clamping to obtain array h 3 ; Perform nonlinear processing to get array h 4 ; Perform normalization to get the array h 5 ; Calculate the cumulative distribution array cdf; The nonlinear image enhancement method provided by the present invention provides control capability for the detail part and the prominent part of the image respectively, is suitable for various types of images, has low computational complexity and has remarkable enhancement effect.

Description

technical field [0001] The invention relates to the field of image enhancement, in particular to a nonlinear image enhancement method with dual control functions. 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: spatial domain-based algorithms and frequency domain-based algorithms according to the different spaces in which the enhancement processing process is located. The dual nonlinear image enhancement method with dual control function and histogram equalization belong to the algorithm based on the space domain, but the histogram equalization often has the problems of excessive enhancement and loss of details. The degree of over-enhancement has not been solved fundamentally. SUMMARY OF THE INVENTION [0004] The main purp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T5/73
Inventor 戴声奎钟峥黄正暐高剑萍
Owner HUAQIAO UNIVERSITY