Stem DBH (diameter at breast height) measuring method based on machine visual sense and three dimensional reconstruction technology

Abstract

The invention discloses a stem DBH (diameter at breast height) measuring method based on machine visual sense and the three dimensional reconstruction technology; the method is realized by the following specific algorithms and models: 1, an intelligent mobile terminal equipment camera calibration model and algorithm, a camera distortion rectification model and algorithm; 2, a two dimensional imagecoordinate system-three dimensional world coordinate system reconstruction model used for solving the problems that unit pixels under different distances are matched with different physical dimensions in the reality world, thus measuring the stem DBH from different distances; 3, a natural environment stem trunk contour detection and extraction algorithm; 4, a stem trunk contour minimum external connection rectangular detection algorithm; 5, a stem trunk height and DBH measuring algorithm used for measuring the DBH of a single stem in a single image. The method can solve the problems in the forest resource investigation works like complex environments, large laboring intensity, and an existing method overly relies on artificial measurements; the method can reduce laboring intensity and labor cost, thus improving working efficiency.

Description

technical field [0001] The invention relates to the field of forest resource investigation, and relates to a method for measuring the diameter of a standing tree at breast height, in particular to a method for measuring the diameter at breast height of a standing tree based on machine vision and three-dimensional reconstruction technology. Background technique [0002] Forest resource data collection is the basis of forest resource monitoring, and improving the efficiency and quality of data collection is an important content of forest resource informatization. In all kinds of forest resources surveys, the measurement of standing tree diameter at breast height is extremely important, but the existing main survey methods rely on manual field surveys and manual measurement with tape or breasth diameter rulers, which is labor-intensive, high in labor costs, and low in efficiency. [0003] In breast diameter measurement, the traditional measurement method is time-consuming, labo...

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a method to solve the problems existing in the forest resource investigation work with complex environment, high labor intensity and excessive reliance on manual measurement, reduce labor intensity and labor cost, and improve labor efficiency.

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