A method for reconstructing an artificial forest model by using a smart phone to obtain single-tree parameters
A smart phone and forest model technology, applied in 3D modeling, image data processing, instruments, etc., can solve problems such as low efficiency and low precision, achieve simple data processing process, rapid data acquisition, and avoid the influence of measurement results Effect
Pending Publication Date: 2019-05-28
BEIJING FORESTRY UNIVERSITY
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[0007] In order to solve the problems of low precision and low efficiency in manual measurement of traditional plantation forest resources, the purpose of the present invention is to provide a method of using a smart phone to reconstruct a plantation forest model to obtain single tree parameters
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[0021] The present invention: a method for obtaining single tree parameters by using a smart phone to rebuild a plantation forest model, said method comprising the following steps:
[0022] Step 1: Use a smartphone with a fixed-focus lens to take multi-angle shots of the standard checkerboard calibration board to obtain the internal parameters of the camera;
[0023] Step 2: Use the calibrated smartphone to take pictures clockwise around the target area with a fixed step, check the quality of the pictures in time, and require the subject to be clear;
[0024] Step 3: according to different light intensities, stand densities and tree species types, the series of photographs are sequentially enhanced through adaptive median filter, saturation enhancement and high-pass filter operations;
[0025] Step 4: Load the enhanced image into the self-developed plantation forest model reconstruction software system, use the Harris corner detection operator to perform multi-scale detection ...
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The invention discloses a method for reconstructing an artificial forest model by using a smart phone to obtain a single tree parameter, which is suitable for obtaining the artificial forest model andinvestigating forest resources, and belongs to the technical field of computer vision in forestry application. The key technical keypoints comprise 1, obtaining the forest image information by usingthe smart phone; 2, obtaining an artificial forest model by using a three-dimensional reconstruction algorithm aiming at forestry improvement; and 3, measuring single tree parameters on the artificialforest model. The key problem to be solved comprises 1, only using a smart phone to obtain a picture of a target forest land during ground survey, reducing the workload of the ground survey, and greatly improving the survey efficiency; 2, obtaining the visual artificial forest model for measurement, so that the precision is higher, and the influence of human factors is avoided. The method is suitable for the accessible artificial forest with a good visual environment under the forest, is a method for acquiring the forest model of the artificial forest and measuring the single tree parametersby using the smart phone for the first time, and can provide the basic data basis for the rapid and accurate investigation work of artificial forest resources.
Description
1. Technical field [0001] The present invention relates to a plantation forest model reconstruction method in the intersecting field of computer vision and forest resource investigation, especially a method for reconstructing plantation forest model using a smart phone, which is suitable for plantation forest model acquisition and forest resource survey, It belongs to the technical field of computer vision in forestry application. 2. Technical Background [0002] Tree height, diameter at breast height and crown width are important single tree parameters when conducting forest resource surveys. They are respectively calculated by calculating the difference between the apex and the bottom point of a single tree, the trunk width at a distance of 1.3 meters from the bottom point, and the north-south and The average value of the width in the east-west direction is used to reflect the growth status of trees, so as to complete the tree survey and formulate reasonable management mea...
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Inventor 张晓丽郭正齐瞿帅郑宇风朱若柠
Owner BEIJING FORESTRY UNIVERSITY