Photogrammetry system and photogrammetry method

Patent metadata

Field	Value
Publication number	US-10397491-B2
Application number	US-201514981947-A
Country	US
Kind code	B2
Filing date	Dec 29, 2015
Priority date	Dec 29, 2014
Publication date	Aug 27, 2019
Grant date	Aug 27, 2019

Abstract

The present invention relates to a photogrammetry system and method. The photogrammetry system comprises: photographing devices capable of photographing an object at a predetermined time interval; and, a data processing device capable of calculating an actual length of the object or a certain portion on the object according to a length of the object or a certain portion on the object in the images obtained by the photographing devices and a distance of the object in the two images, wherein the object moves at a speed V; the photographing devices photograph the object for two times at a time interval t; the distance of the object in the two images obtained by the two times of photographing is Dp; the length of the object or a certain portion on the object in the images is Lp; and, the actual length L of the object or a certain portion on the object may be obtained by the following formula:

L
=

Lp
×

Vt
Dp

.

First claim

The invention claimed is:

1. A photogrammetry method, comprising the following steps:
(a) in a direction perpendicular to a direction of movement of an object to be measured with respect to photographing devices, photographing, by the photographing devices, the object to be measured two times at a predetermined time interval to obtain two images, respectively; and
(b) according to a length Lp of the object to be measured or at least one portion of the object to be measured in the two images obtained by the photographing devices, a transverse movement distance Dp of the object to be measured or the least one portion of the object to be measured in the two images, and a speed of the object to be measured, calculating an actual length L of the object to be measured or the at least one portion of the object to be measured;
the object to be measured moves at a speed V, and, in step (a), the photographing devices photograph the object to be measured two times at a time interval t, or the object to be measured is stationary, and, in step (a), the photographing devices move at a speed V in a direction perpendicular to a photographing direction and photograph the object to be measured for two times at a time interval t; and
in step (b), the transverse movement distance Dp of the object to be measured or the at least one portion of the object to be measured in the two images obtained by the two times of photographing and the length Lp of the object to be measured or the at least one portion of the object to be measured in the images are obtained, and then the actual length L of the object to be measured or the at least one portion of the object to be measured is obtained by the following formula:

L
=

Lp
×

Vt
Dp

;

wherein Dp is a non-zero, real number.

2. A photogrammetry method, comprising the following steps:
(a) in a direction perpendicular to a direction of movement of an object to be measured with respect to photographing devices, photographing, by the photographing devices, the object to be measured two times at a predetermined time interval to obtain two images, respectively; and
(b) according to a length Lp of the object to be measured or at least one portion of the object to be measured in the two images obtained by the photographing devices, a transverse movement distance Dp of the object to be measured or the least one portion of the object to be measured in the two images, and a speed of the object to be measured, calculating an actual length L of the object to be measured or the at least one portion of the object to be measured;
the object to be measured is stationary, and, in step (a), the photographing devices photograph the object to be measured at two positions having a distance S therebetween to obtain two images, respectively; and
in step (b), the transverse movement distance Dp of the object to be measured or the at least one portion of the object to be measured in the two images and the length Lp of the object to be measured or the at least one portion of the object to be measured in the two images are obtained, and then the actual length L of the object to be measured or the at least one portion of the object to be measured is obtained by the following formula:

L
=

Lp
×

S
Dp

;

wherein Dp is a non-zero, real number.

3. A photogrammetry method, comprising the following steps:
(a) in a direction perpendicular to a direction of movement of an object to be measured with respect to photographing devices, photographing, by the photographing devices, the object to be measured two times at a predetermined time interval to obtain two images, respectively; and
(b) according to a length of the object Lp to be measured or at least one portion of the object to be measured in the two images obtained by the photographing devices, a transverse movement distance Dp of the object to be measured or the least one portion of the object to be measured in the two images, and a speed of the object to be measured, calculating an actual length L of the object to be measured or the at least one portion of the object to be measured;
in the photogrammetry method, a first photographing device and a second photographing device successively arranged at a predetermined distance in a direction parallel to the direction of movement of the object to be measured are used; and
in step (a), the first photographing device photographs a picture of the object to be measured, and the second photographing device shoots a video of the object to be measured;
in step (b), frames of the video obtained by the second photographing device are retrieved to obtain a frame image most approximate to the picture obtained by the first photographing device, and a difference between the time of taking the picture and the time of taking the frame image is calculated to obtain a movement speed V of the object to be measured;
in step (b), two frames are extracted from the frames of the video obtained by the second photographing device, a time interval t between the two frames is calculated, the transverse movement distance Dp of the object to be measured or the least one portion of the object to be measured in the two frames and the length Lp of the object to be measured or at least one portion of the object to be measured in the frame image are measured, and the actual length L of the object to be measured or the at least one portion of the object to be measured is obtained by the following formula in combination with the obtained movement speed V of the object to be measured:

L
=

Lp
×

Vt
Dp

;

wherein Dp is a non-zero, real number.

Assignees

• Nuctech Co Ltd

Inventors

• Li Mingliang
• Li Yuanjing
• Li Jianmin
• Li Ying
• Chen Zhiqiang
• Kang Kejun

Classifications

• H04N23/90 Primary

  Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums · CPC title

• G01P3/68

  using optical means, i.e. using infrared, visible, or ultraviolet light (G01P3/80 takes precedence {; by reflection of waves G01S17/58}) · CPC title

• G06T7/60

  Analysis of geometric attributes · CPC title

• G01C11/06 Primary

  by comparison of two or more pictures of the same area · CPC title

• G01B11/04

  specially adapted for measuring length or width of objects while moving · CPC title