Method for acquiring number of spray droplets in spray image based on standard deviation

An acquisition method and standard deviation technology, applied in the field of image processing, can solve problems such as roughness, and achieve the effect of reducing target loss

Active Publication Date: 2018-05-01
JILIN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings of this "rough" processing method, to propose a more precise processing method, and to obtain as accurate droplet quantity information as possible

Method used

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  • Method for acquiring number of spray droplets in spray image based on standard deviation

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Embodiment Construction

[0024] [1] Preprocess the entire image: read the image to be processed, use the imfinfo function to obtain the pixel values ​​of the Width and Height of the image; convert the image to a grayscale image, and use the morphological opening operation to obtain the background image of the image; Subtract the background image image from the original image to obtain the image after subtracting the background; use the adjust function to enhance the contrast of the image, and use the strtechlim automatic contrast expansion for contrast expansion; threshhold automatic threshold acquisition; convert the image type to form a binary image; use 4 Connected areas to calculate the number of target areas; use the gra function to obtain the basic information of the target in the image, such as the average area of ​​the image target;

[0025] [2] Determine the physical segmentation score of the image, use the factor ratio to carry out in the field of Q1=1000~1200 or wider, let F be the number of...

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Abstract

The invention relates to a method for acquiring the number of spray droplets in a spray image based on the standard deviation, which aims to improve the accuracy of calculation for the number of spraydroplets. The method mainly solves problems that the brightness differentiation between a background image and the droplets is unapparent and that the calculation for the number of the droplets is inaccurate due to great variations in brightness of the background image and realizes accurate calculation for the number of the droplets. The method is implemented according to the steps that (1) a morphological opening operation is performed on the whole image to obtain a background image, the average area of the droplets is acquired, the number of segmentation parts of the whole image is determined according to the information such as the average area of the droplets, the background of each part of the image is acquired by using the morphological opening operation, and the standard deviationof the brightness of each part of background image and the standard deviation of the brightness of the original image are acquired; (2) a background image acquisition method is determined according tothe standard deviation of the brightness of the background image and the standard deviation of the brightness of the original image; and (3) the number of droplets of each corresponding image is obtained, and the numbers are added together to obtain the number of spray droplets of the whole image.

Description

technical field [0001] The invention relates to an image information extraction technology, which belongs to the field of image processing, in particular to a method for extracting droplet quantity information based on MATLAB processing spray images. Background technique [0002] As emissions regulations and fuel consumption regulations become more stringent, and more and more internal combustion engines use higher and higher fuel injection pressures, the acquisition of engine fuel spray information is becoming more and more important. Using a high-resolution camera to photograph the spray to obtain information is a more direct and rapid method. Due to the small diameter of the droplet itself, and the image is affected by various properties during the process of shooting and transmission, it will eventually affect the acquisition of the information on the number of droplets in the image. There are various reasons that affect the acquisition of droplet number information in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/136
CPCG06T5/001G06T2207/20104G06T2207/30242G06T7/136
Inventor 董伟张振东蒲超杰孙昊天宋柏达周广
Owner JILIN UNIV
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