Plane area measuring method based on digital image analysis

Abstract

The invention discloses a plane area measuring method based on digital image analysis, which comprises the steps of establishing a photographing system and setting a photographing background plane; placing a measured object on the photographing background plane and enabling the measured object to be parallel to the photographing background plane; carrying out imaging by using the photographing system to acquire a measured digital image; processing the measured digital image and calculating the reference area and a reference pixel value of a reference image; calculating a target pixel value of the measured plane; calculating the target measurement area of the measured plane; calculating an area correction coefficient; and carrying out correction on the target measurement area according to the area correction coefficient so as to acquire the actual area of the measured plane. The plane area measuring method disclosed by the invention is based on digital image analysis technique, enables plane area measurement to be realized conveniently, and has the advantages of high accuracy and wide application range.

Description

technical field [0001] The invention relates to the technical field of plane area measurement, in particular to a plane area measurement method based on digital image analysis. Background technique [0002] In many occasions, it is necessary to measure the surface area of ​​irregularly shaped objects, such as the calculation of map area in monitoring and survey activities, the calculation of plant leaf area in botanical research, the calculation of lesion area in medical plastic surgery, and the release of nickel from simulation ornaments. The calculation of the contact area in the test, the calculation of the contact area in the detection of the migration of harmful substances in food contact materials, etc. [0003] At present, there are many methods for measuring the plane area, which can be roughly divided into manual measurement method and electronic technology measurement method. The manual measurement method has simple equipment and easy operation, but it is time-con...

AI Technical Summary

Problems solved by technology

[0004] However, these studies and applications in the prior art are all based on the fact that the measured object and the reference background are in or approximately on the same plane, that is, they do not consider that when the measured object and the reference background are in different planes, different shooting Effect of object distance on measurement results

For example, in the calculation of the contact area for the detection of nickel release in simulated jewelry, since the target object is a three-dimensional structure with a certain thickness, the measured plane and the reference plane of the measured object cannot be approximated to the same plane usually. The closer the lens is to the plane, the greater the magnification. If the above-mentioned area measurement method is applied, the calculation result will be larger than the actual value.

Therefore, the current technical solution affects the accuracy and scope of application of the plane area measurement method

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