CN102003942B - Image-based method for detecting tree diameter - Google Patents

Image-based method for detecting tree diameter Download PDF

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Publication number
CN102003942B
CN102003942B CN2010105033060A CN201010503306A CN102003942B CN 102003942 B CN102003942 B CN 102003942B CN 2010105033060 A CN2010105033060 A CN 2010105033060A CN 201010503306 A CN201010503306 A CN 201010503306A CN 102003942 B CN102003942 B CN 102003942B
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China
Prior art keywords
trunk
image
tree
laser
diameter
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CN2010105033060A
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Chinese (zh)
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CN102003942A (en
Inventor
程朋乐
李晓慧
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北京林业大学
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Abstract

The invention discloses an image-based method for detecting tree diameter, belonging to the technical field of non-contact measurement. A laser spot serves as an image measurement scale, a laser beam after collimated beam expansion irradiates a tree trunk the diameter of which is required to be measured to generate a light spot, a digital camera is used to take the image of the tree trunk at the position of the laser spot, and the tree diameter is measured according to the number of pixels of the laser spot in the image. In the measurement method of the invention, the less hardware is required, the calculated amount is small and the detection accuracy and the detection efficiency of tree diameter are improved.

Description

Tree-walk detection method based on image

Technical field

The invention belongs to the image measurement technology field, relate to a kind of digital camera that utilizes tree-walk is carried out detection method, be particularly suitable for the diameter of telemeasurement trunk.

Background technology

In forest inventory investigation, the measurement of tree-walk is a most important content.Traditional metering system is used caliper scale, diameter tape and inspection footpath chi (hook gauge) always and is directly measured, but these instruments all can only be measured the diameter of a cross-section of a tree trunk 1.3 meters above the ground of trees, can't measure the upper diameter of trees, and efficiency of measurement are lower.The non-cpntact measurement that adopts the method for image to carry out tree-walk can remedy the deficiency of traditional measurement method, more and more comes into one's own at present.

Central China University of Science and Technology's Mechanical Academy proposes camera to be demarcated the method for measuring (Song Xiaochun, Kang Yihua etc. with surveyors' staff; Based on the forest automatic measurement system research of Digital Image Processing, computer engineering and design, 2005; 26 (5): 1,187 1189.), the weak point of this method is to place scale at the trunk place that will measure, and efficiency ratio is lower; And by the district some can't near the side of trees and trees eminence do the place and can't place scale, can't measure.When taking a picture, the distance between illuminated object and the camera not simultaneously, enlargement ratio is also different.This method can not guarantee trunk and scale on same plane, and scale and the trunk enlargement factor when camera imaging is different like this, is easy to generate measuring error.

Resource and environment institute of Beijing Forestry University proposes the common scion camera of a kind of close shot tree survey method (Feng Zhongke; Yao Shan, close-range ordinery digital camera tree metering method, Chinese patent: 200610145564.X; 2007-8 22.); This method need be chosen at least 5 distinguishing marks in the camera coverage when each the measurement, measure its center three-dimensional coordinate with extra measuring equipment, sets up the relation between volume coordinate and the image coordinate through interpolation then.The weak point of this method is need be by the three-dimensional coordinate of other survey instrument measurement space point, and data processing amount is big, and efficiency of measurement is low.

Summary of the invention

The present invention has overcome the deficiency of above-mentioned technology, and a kind of method of the measurement trunk diameter based on image is provided, and its purpose is efficiently, the non-cpntact measurement tree-walk.

Tree-walk detection method based on image of the present invention; Laser beam needs to measure on the trunk of tree-walk through shining behind the collimator and extender, with the image of digital camera shooting laser facula position trunk, measures tree-walk according to the pixel count of laser facula in image; This method is carried out according to the following steps

(1) the laser instrument emitted light beams is d through diameter behind the collimator and extender 1The hot spot of mm shines to be needed to measure on the trunk of tree-walk,

(2) take the image of laser facula position trunk with digital camera,

(3) if the trunk diameter of measuring is thinner; Its diameter is less than the diameter of laser beam; Laser beam can not shine on the trunk in the tree-walk direction fully; Have segment beam can pass trunk, for the versatility that guarantees to measure, when calculating, choose laser beam along the diameter of trunk height direction as standard size.Laser spot diameter is n along pixel count shared on the trunk height direction on the captured digital picture 1, trunk is n along diametric(al) shared pixel count on image 2,

(4) the trunk diameter d of the required measurement of calculating

d = d 1 n 1 · n 2 mm .

Described tree-walk detection method based on image; Utilize laser to have very strong directivity; Propagate the characteristics of dispersing hardly along certain orientation; The scale that adopts laser beam irradiation to measure as tree-walk along the diameter of trunk height direction to the hot spot on the trunk, it is identical to shine spot diameter on the tree diameter when launching with laser beam.

The scale that the present invention adopts laser beam irradiation to measure as tree-walk along the diameter of trunk height direction to the hot spot on the trunk; Scale and trunk have been guaranteed at grade; Make the two identical, guaranteed the precision of measuring, saved step simultaneously at tree held scale at magazine enlargement ratio; Improved efficiency of measurement, overcome area such as in mountain area overhanging cliff some can't near trees and the side of trees eminence do the difficulty that scale can't be placed by the place.Measuring method provided by the present invention does not need the three-dimensional coordinate of extra apparatus measures spatial point, has reduced operand, has improved detection efficiency.Hardware required for the present invention is less, and measuring accuracy and reliable measurement property are high, is applicable to the diameter of telemeasurement trees.

Embodiment

Tree-walk detection method based on image; Laser beam needs to measure on the trunk of tree-walk through shining behind the collimator and extender; With the image of digital camera shooting laser facula position trunk, measure tree-walk according to the pixel count of laser facula in image, embodiment is following:

(1) the laser instrument emitted light beams is d through diameter behind the collimator and extender 1The light beam irradiates of mm is measured to needs on the trunk of tree-walk,

(2) with the image of digital camera shooting laser facula position trunk, image is preserved with jpeg format,

(3) captured digital photograph is passed on the computing machine with data line, extract on computers that laser spot diameter is n along pixel count shared on the trunk height direction on the captured digital picture 1, trunk is n along the shared pixel count of diametric(al) 2,

(4) the trunk diameter d of the required measurement of calculating

d = d 1 n 1 · n 2 mm .

Claims (2)

1. based on the tree-walk detection method of image; Laser beam needs to measure on the trunk of tree-walk through shining behind the collimator and extender; With the image of digital camera shooting laser facula position trunk, measure tree-walk according to the pixel count of laser facula in image, it is characterized in that; This method is carried out according to the following steps
(1) the laser instrument emitted light beams is d through diameter behind the collimator and extender 1The hot spot of mm shines to be needed to measure on the trunk of tree-walk,
(2) take the image of laser facula position trunk with digital camera,
(3) laser spot diameter is n along pixel count shared on the trunk height direction on the captured digital picture 1, trunk is n along the shared pixel count of diametric(al) 2,
(4) the trunk diameter d of the required measurement of calculating
d = d 1 n 1 · · n 2 mm .
2. the tree-walk detection method based on image as claimed in claim 1 is characterized in that, the scale of measuring as tree-walk with the spot diameter of laser beam irradiation to the trunk.
CN2010105033060A 2010-10-12 2010-10-12 Image-based method for detecting tree diameter CN102003942B (en)

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CN102269571A (en) * 2011-07-06 2011-12-07 福建农林大学 Method and device for measuring diameter of bamboo tube based on digital image processing technology
CN102538693B (en) * 2012-02-14 2014-09-10 北京林业大学 Vertical wood diameter detection method based on laser and vision technology
CN102589455B (en) * 2012-02-14 2015-04-15 北京林业大学 Standing wood diameter detection device based on laser and visual technology
CN102878934A (en) * 2012-09-24 2013-01-16 北京林业大学 Standing tree comprehensive detection device based on intelligent fusion technology
CN102901454A (en) * 2012-09-24 2013-01-30 北京林业大学 Stumpage comprehensive detecting technique based on information fusion technology
CN102927921B (en) * 2012-11-13 2016-04-27 北京林业大学 Based on the standing tree tree breast diameter survey method of optics similar triangles method
CN103453893A (en) * 2013-10-08 2013-12-18 北京林业大学 Method for acquiring tree branch and trunk factors based on three-dimensional photographical measurement
CN103604380B (en) * 2013-11-28 2016-02-17 东北林业大学 Tree breast-height diameter method and Portable tree tree breast diameter survey system
CN105157586B (en) * 2015-04-24 2017-03-15 北京林业大学 A kind of method that photography telemetry calculates any place trunk diameter
CN106408608A (en) * 2016-09-30 2017-02-15 信阳师范学院 Method for extracting trunk diameter from ground laser radar point cloud data
CN109373897B (en) * 2018-11-16 2020-07-31 广州市九州旗建筑科技有限公司 Measuring method based on laser virtual scale

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