Plane area measuring method based on digital image technology

Abstract

The invention discloses a plane area measuring method based on a digital image technology, which comprises the following steps: (1) carrying out parameter calibration to a pick-up device of a measuring system to obtain an internal parameter of the pick-up device; (2) utilizing the pick-up device to obtain an original image of background, and carrying out image correction and / or distortion correction and gray processing to the image to obtain a gray image of the background; (3) putting a plane primary standard substance with knew area in the background, imaging the plane primary standard substance by the pick-up device, carrying out the image correction and / or distortion correction, gray processing, difference operation and binarization processing to obtain a nonzero pixel of a binary image of the plane primary standard substance; (4) putting an object to be measured in the background, and obtaining a nonzero pixel of a binary image of the object to be measured according to the method of step (3) ; and (5) obtaining area of the object to be measured according to pixel equivalent of the measuring system and the nonzero pixel of the object to be measured.

Description

technical field [0001] The invention relates to the field of digital image processing, in particular to a method for measuring the area of ​​an irregular plane using digital image processing technology. Background technique [0002] In the field of industrial production and field survey, it is necessary to measure the area of ​​irregular plane objects, such as the area of ​​leather or leaves. These irregular areas are difficult to measure quickly and accurately with traditional geometric measurement methods. The irregular area measuring instrument (skin measuring machine or loose leaf instrument) widely used at present is all made up of photoelectric conversion system and integrated computing system. Its measurement principle is to differentiate the target area and then accumulate and sum. The accuracy of this type of system is determined by the size of the unit area. The finer the unit area integral is, the higher the measurement accuracy is. Therefore, to achieve a suita...

AI Technical Summary

Problems solved by technology

But it has the following disadvantages: (1) It is impossible to correct the errors caused by the defects of the digital camera itself (2) It has high requirements for the shooting background and requires a single color (3) It is difficult to extract the edge of the measured object, the amount of calculation is large, and it is anti-interference Weak ability

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