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Image threshold determination method based on pixel gradient distribution

A gradient distribution and determination method technology, applied in image enhancement, image analysis, image data processing, etc., can solve the problems of large segmentation errors, low authenticity and reliability of segmentation results, etc., achieve simple algorithm, fast calculation speed, and calculation Small amount of effect

Inactive Publication Date: 2019-07-19
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Practice shows that the existing algorithm has a large error in the segmentation of the gray distribution histogram of the unimodal distribution image, and the authenticity and reliability of the segmentation results are low.

Method used

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  • Image threshold determination method based on pixel gradient distribution
  • Image threshold determination method based on pixel gradient distribution
  • Image threshold determination method based on pixel gradient distribution

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Embodiment Construction

[0026] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] For the image whose gray distribution histogram shows a unimodal distribution, a certain property of the pixel neighborhood is introduced to determine the threshold. The present invention selects the gradient of the pixel point as the research object, and the research shows that the size of the pixel gradient reflects the difference between different regions. By calculating the gradient of each pixel in the original image, and statistically analyzing the obtained gradient value, the pixel gradient distribution histogram of the image is drawn, and the optimal segmentation threshold is determined based on the shape of the pixel gradient distribution histogram. Such as figure 1 As shown, the specific steps are as follows:

[0028] Step 1: Selection of gradient operator template

[0029] The Sobel operator assigns different weight val...

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Abstract

The invention discloses an image threshold determination method based on pixel gradient distribution. The method comprises the steps of for an image with the gray level distribution histogram in unimodal distribution, calculating the gradient of each pixel point in the image, carrying out statistical analysis on the obtained gradient value, drawing a pixel gradient distribution histogram of the image, and determining an optimal segmentation threshold value based on the form of the pixel gradient distribution histogram. According to the method, the segmentation threshold of the image with the gray level distribution histogram in unimodal distribution can be accurately and rapidly determined, and the segmentation effect of the image is improved.

Description

technical field [0001] The invention belongs to the field of digital image information extraction, and in particular relates to an image threshold determination method based on pixel gradient distribution. Background technique [0002] Thanks to the rapidly developing digital imaging technology (CT, SEM, FIB / SEM), the microscopic pore structure inside the sample can be visualized. For an image with obvious contrast between the target and the background, that is, its gray distribution histogram presents obvious bimodal or multimodal distribution, the existing algorithm selects the valley point between the two peaks as the optimal threshold to distinguish the target and background in the image. perform accurate and efficient segmentation. In addition, there are still some images because the target area is smaller than the background area or the grayscale transition between the target and the background is relatively gentle, that is, its grayscale distribution histogram presen...

Claims

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Application Information

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IPC IPC(8): G06T7/11G06T7/136G06T7/194
CPCG06T2207/10081G06T7/11G06T7/136G06T7/194
Inventor 刘江峰宋帅兵马丹倪宏阳杨典森陈亮
Owner CHINA UNIV OF MINING & TECH
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