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Secondary histogram equalization image enhancement method and system of histogram correction

A histogram equalization and image enhancement technology, applied in the field of image processing, can solve problems such as hard visual effects, loss, and loss of image details

Active Publication Date: 2016-05-25
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the histogram equalization algorithm has the advantages of fast calculation speed and obvious enhancement effect, there are also gray levels that are merged, resulting in the reduction and loss of the gray level of the image, the phenomenon of gray level faults, and the loss of valuable details of the image. , the disadvantage of blunt visual effect

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  • Secondary histogram equalization image enhancement method and system of histogram correction
  • Secondary histogram equalization image enhancement method and system of histogram correction
  • Secondary histogram equalization image enhancement method and system of histogram correction

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Embodiment 1

[0043] like figure 1 Shown, a kind of secondary histogram equalization image enhancement method of the present invention comprises the following steps:

[0044] Step S1, in the grayscale histogram array H of the original image I (being the lena image) I (k) based on the construction of the histogram array H J (k')(k=I(i, j), i, j are respectively the number of rows and the number of columns of the original image I, 0≤k≤255);

[0045] Step S2, the histogram array H J (k') and histogram array H I Each gray level in (k) is replaced one by one according to the order of gray levels from large to small to construct a new histogram array H' I (k);

[0046] Step S3, for the new histogram array H' I (k) Carry out cumulative summation to form a new enhanced image W through the new gray level k".

[0047] Specifically, the histogram array H of the gray level of the original image I in the step S1 I (k) based on the construction of the histogram array H J The method of (k') compr...

Embodiment 2

[0083] like Figure 4 As shown, on the basis of Embodiment 1, Embodiment 2 provides a secondary histogram equalized image enhancement system, including:

[0084] A first histogram array construction unit, a second histogram array construction unit connected to the first histogram array construction unit; and the second histogram array construction unit connected to the enhanced image construction unit. The first histogram array construction unit is suitable for the histogram array H of the gray level of the original image I I Build a histogram array based on (k).

[0085] The histogram array construction unit is suitable for the histogram array H J (k') and histogram array H I Each gray level in (k) is replaced one by one according to the order of gray levels from large to small to construct a new histogram array H' I (k).

[0086] The enhanced image construction unit is adapted to the new histogram array H' I (k) Carry out cumulative summation to form a new enhanced ima...

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Abstract

The invention relates to a secondary histogram equalization image enhancement method and system of histogram correction. The secondary histogram equalization image enhancement method comprises the following steps that S1) a histogram array HJ(k ') is established on the basis of a histogram array HI(k) of the gray level of an original image I; S2) replacement in one to one correspondence is carried out on the gray levels in the HJ(k ') and the histogram array HI(k) from high to low gray levels to establish a new histogram array H'I (K); and S3) cumulative summation is carried out on the new histogram array H'I (K) so that a new enhanced image W is established via the new gray level k''. According to the invention, under the condition that the entropy of the image is kept unchanged as possible, the gray level of the image is prevented from being swallowed, the image is effectively enhanced, the gray level, detail information and brightness of the image are effectively maintained, and the image looks soft.

Description

technical field [0001] The invention relates to an image enhancement technology, which belongs to the field of image processing, and in particular to a histogram correction secondary histogram equalization image enhancement method and system. Background technique [0002] Histogram equalization method has become a common method of image enhancement because of its effectiveness and ease of use. The basic idea is to determine the corresponding grayscale output value of the image according to the grayscale probability distribution of the input image, and improve the visual effect of the image by expanding the dynamic range of the grayscale distribution of the image, so as to achieve the purpose of improving the contrast of the image. Although the histogram equalization algorithm has the advantages of fast calculation speed and obvious enhancement effect, there are also gray levels that are merged, resulting in the reduction and loss of the gray level of the image, the phenomeno...

Claims

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Application Information

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IPC IPC(8): G06T5/40
Inventor 章怡王海峰彭建业薛勇
Owner JIANGSU UNIV OF TECH