CN105222759A - A kind of binocular camera observation Forests random sample ground method on vertically baseline - Google Patents

Abstract

The invention discloses a kind of binocular camera observation Forests random sample ground method on vertically baseline; Ordinary digital camera is widely used in photogrammetric, but, circumstance complication in forest survey, be difficult to ensure that the stereogram that photo restores is really and accurately, therefore, binocular camera on traditional horizontal base line to be improved on vertical baseline binocular camera observation forest permanent sample plot significant for forest survey for this method.

Description

A kind of binocular camera observation Forests random sample ground method on vertically baseline

One, technical field

The invention belongs to photogrammetric in, a kind of binocular camera observation Forests random sample ground method on vertically baseline.

Two, technical background

Ordinary digital camera is widely used in photogrammetric, but, circumstance complication in forest survey, be difficult to ensure that the stereogram that photo restores is really and accurately, therefore, binocular camera on traditional horizontal base line to be improved on vertical baseline binocular camera observation forest permanent sample plot significant for forest survey for this method.

Three, summary of the invention

First, before permanent sample plot starts shooting, tripod is placed in permanent sample plot center, ensure level according to leveling bubble adjustment tripod, vertical baseline is fixed binocular camera in tripod, shooting obtains cubic phase pair one on the other, therefrom extracts the diameter of a cross-section of a tree trunk 1.3 meters above the ground.The reason of selection level baseline not being placed camera acquisition stereogram, because the left and right edges point of the target ebon stem portion on two sheet photos is not corresponding image points, is difficult to therefrom extract the diameter of a cross-section of a tree trunk 1.3 meters above the ground;

Then, in inceptive direction shooting the 1st group of photograph, according to horizontal scale on tripod, binocular camera is rotated counterclockwise 30 °, take the 2nd group of photograph, the reason of 30 ° is selected to be when obtaining upper and lower cubic phase pair, the left and right fields of vision angle of photograph only has 34 °, and the cubic phase taken up and down is 100% to left and right degree of overlapping, and choosing 30 ° is to ensure that the target ebon of photograph boundary member does integrality;

Finally, repeat previous step, until rotate 11 times, obtain 12 groups of stereograms being used for photograph sample ground and extracting altogether, get back to initial position through the 12nd rotation.

Four, accompanying drawing explanation

Below in conjunction with drawings and Examples, the present invention is further described.

Vertical baseline fixes binocular camera schematic diagram to Fig. 1;

Fig. 2 selection level baseline is not placed schematic diagram (two cameras that L, R-horizontal base line is placed that camera obtains stereogram; L ₁, L ₂the Liang Chu point of contact, trunk edge of-L camera observation; R ₁, R ₂the Liang Chu point of contact, trunk edge of-R camera observation; O-trees central point).

Five, embodiment

First, before permanent sample plot starts shooting, tripod is placed in permanent sample plot center, ensure level according to leveling bubble adjustment tripod, vertical baseline is fixed binocular camera in tripod, shooting obtains cubic phase pair one on the other, therefrom extracts the diameter of a cross-section of a tree trunk 1.3 meters above the ground.The reason of selection level baseline not being placed camera acquisition stereogram, because the left and right edges point of the target ebon stem portion on two sheet photos is not corresponding image points, is difficult to therefrom extract the diameter of a cross-section of a tree trunk 1.3 meters above the ground;

Then, in inceptive direction shooting the 1st group of photograph, according to horizontal scale on tripod, binocular camera is rotated counterclockwise 30 °, take the 2nd group of photograph, the reason of 30 ° is selected to be when obtaining upper and lower cubic phase pair, the left and right fields of vision angle of photograph only has 34 °, and the cubic phase taken up and down is 100% to left and right degree of overlapping, and choosing 30 ° is to ensure that the target ebon of photograph boundary member does integrality;

Finally, repeat previous step, until rotate 11 times, obtain 12 groups of stereograms being used for photograph sample ground and extracting altogether, get back to initial position through the 12nd rotation.

Claims (2)

1. binocular camera observation Forests random sample ground method on a vertical baseline.

2. first, before permanent sample plot starts shooting, tripod is placed in permanent sample plot center, level is ensured according to leveling bubble adjustment tripod, vertical baseline is fixed binocular camera in tripod, shooting obtains cubic phase pair one on the other, therefrom extracts the diameter of a cross-section of a tree trunk 1.3 meters above the ground.The reason of selection level baseline not being placed camera acquisition stereogram, because the left and right edges point of the target ebon stem portion on two sheet photos is not corresponding image points, is difficult to therefrom extract the diameter of a cross-section of a tree trunk 1.3 meters above the ground;

Then, in inceptive direction shooting the 1st group of photograph, according to horizontal scale on tripod, binocular camera is rotated counterclockwise 30 °, take the 2nd group of photograph, the reason of 30 ° is selected to be when obtaining upper and lower cubic phase pair, the left and right fields of vision angle of photograph only has 34 °, and the cubic phase taken up and down is 100% to left and right degree of overlapping, and choosing 30 ° is to ensure that the target ebon of photograph boundary member does integrality;

Finally, repeat previous step, until rotate 11 times, obtain 12 groups of stereograms being used for photograph sample ground and extracting altogether, get back to initial position through the 12nd rotation.