A non-contact area measurement method based on image analysis

Abstract

The invention relates to an image-analysis-based non-contact area measurement method. Camera calibration, target image collection, target image pixel point extraction, angular point coordination recovery of a pixel point, calculation of a sum of practical areas of pixel points are carried out to obtain a practical area of a target object. According to the invention, continuous high-precision measurement is realized and the precision can reach a pixel level. A camera is not in contact with a measured object directly; no angle requirement is needed during image obtaining; shooting can be carried out at any angle; the freedom is high; and the method is suitable for a high-temperature or high voltage environment or an environment in which short-distance measurement can not be realized. In addition, the method can be operated simply; the consumption is low; and data processing can be completed automatically. The method is suitable for industrial popularization and application and especially has the positive significance in measurement of different plant leaf areas in agriculture, measurement of lesion areas in medical treatment, and territorial water division at boundaries and the like.

Description

technical field [0001] The invention belongs to the technical field of measurement, in particular to a non-contact area measurement method based on image analysis. Background technique [0002] At present, the commonly used methods for area measurement are: graph paper method, measurement method based on digital image analysis, and contact area measurement method based on image measurement technology. Although the graph paper method is cheap and fast, its shortcomings are also very obvious. To measure a more accurate area value and must be in contact with the measured object, and the measurement error is relatively large; the measurement method based on digital image analysis can obtain very accurate results, but the measurement system needs to be debugged in advance, the camera and the measurement plane There are strict parameter requirements, and once the construction is successful, they cannot move freely; in addition, the contact area measurement method based on image me...

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Problems solved by technology

[0002] At present, the commonly used methods for area measurement are: graph paper method, measurement method based on digital image analysis, and contact area measurement method based on image measurement technology. Although the graph paper method is cheap and fast, its shortcomings are also very obvious. To measure a more accurate area value and must be in contact with the measured object, and the measurement error is relatively large; the measurement method based on digital image analysis can obtain very accurate results, but the measurement system needs to be debugged in advance, the camera and the measurement plane There are strict parameter requirements, and once the construction is successful, they cannot move freely; in addition, the contact area measurement method based on image measurement technology can meet the measurement of target images in different environments, and the required equipment is cheap, but using this method It is necessary to make contact with the target to be measured, and the measurement work in some environments does not allow direct contact with the target to be measured

[0003] From this point of view, the existing area measurement methods have high requirements for the measurement environment or cannot obtain accurate measurement results. For the measurement of some irregular shapes or space areas and the area measurement of special environments that cannot be directly contacted under high temperature or high pressure conditions It cannot be realized and cannot meet the area measurement and calculation requirements of the non-contact environment

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