CN105389816A - Improved image-based three-dimensional measurement system marking point design method - Google Patents
Improved image-based three-dimensional measurement system marking point design method Download PDFInfo
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- CN105389816A CN105389816A CN201510740615.2A CN201510740615A CN105389816A CN 105389816 A CN105389816 A CN 105389816A CN 201510740615 A CN201510740615 A CN 201510740615A CN 105389816 A CN105389816 A CN 105389816A
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- height
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- people
- measurement
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30232—Surveillance
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30244—Camera pose
Abstract
The invention discloses an improved image-based three-dimensional measurement system marking point design method. The method comprises a first step of inputting in which a measurement aid needs to be used when a height of a person in a certain monitoring picture is measured, a second step of calculation in which a Tsai two-step calibration method is used for determining inner and outer parameters of a camera, and two groups of principal point coordinates Cx and Cy are selected for calculation, and a third step of correction in which a person abnormal image height is recorded as Hp', a lens correction rod abnormal image height is recorded as Ht', an actual person height is recorded as Hp, an actual lens correction rod height is recorded as Ht, and according to Hp':Ht'=Hp:Ht, the actual person height is calculated according to a formula Hp=(Ht*Hp')/Ht'.
Description
Technical field
The invention belongs to the special measurement technique field of criminal investigation, be specifically related to a kind of method for designing based on monumented point in the three-dimension measuring system of image of improvement.
Background technology
In recent years, some important cases have been cracked by video or image document, therefore, in monitor data, the analysis of picture is more and more subject to the attention of criminal investigation department, and the monitoring probe of increasing common monitoring (as traffic " electronic eyes ") and market, personal settings, also provide the foundation for the enforcement of this technology in criminal investigation.
Since national public security organ carries out video image investigation, in video image, the height Research on measuring technique of people roughly experienced by three phases: experience method, site test method and software measurement method.Experience method is larger by the experience influence of criminal investigation technician; In Situ is lost time, man power and material, and accuracy is not high; It is short that software measurement method has the activity duration, saves the advantage such as human and material resources, and comparatively the above two accuracy increase, but are subject to the factor impact such as len distortion, fuzzy, the on-the-spot disappearance object of reference of monitored picture.
Software is utilized to be a kind of method for three-dimensional measurement based on image to suspect's height measurement in monitoring, three-dimensional measurement based on image is most important and the identification of to be the gordian technique of difficult point be monumented point with mate, and the design of monumented point is most important for the accuracy of last measurement result.And in len distortion, fuzzy pictures, lack in object of reference, the inaccurate measuring result error that makes of monumented point is larger.
Based on above-mentioned factor, the invention provides a kind of method for designing based on monumented point in the three-dimension measuring system of image of improvement, measuring process is simple, can improve the accuracy that in video image, suspect's height is measured.
Summary of the invention
The factor impact such as len distortion, fuzzy, the on-the-spot disappearance object of reference of monitored picture is subject to for solving in background technology in the video image investigation process mentioned, make monumented point inaccurate, and then affect the problem of accuracy of suspect's height measurement result, the invention provides a kind of method for designing based on monumented point in the three-dimension measuring system of image of improvement, the accuracy that in video, suspect's height is measured can be improved.
The technical matters that the present invention solves is achieved through the following technical solutions:
The method for designing based on monumented point in the three-dimension measuring system of image of improvement, comprises the steps:
The first step: demarcate
To camera calibration, determine the video camera internal and external parameter of software for calculation.When measuring the people's height in certain monitored picture, by on-the-spot for the visual field that measurement assistor is arranged to this video camera, two people coordinate, one people at the scene traverse measurement frame 1, people watches video monitoring picture in the wings, coordinates front-end person who to move tester, until this subsidiary device is in original painting middle ideal position, capture present frame, at the world coordinates on adjoint software typing 8 measurement bay summits of this method, as monumented point.
Second step: calculate
Utilize the two-stage calibration method determination video camera internal and external parameter of Tsai: first obtain orthogonal transformation battle array R and translation vector matrix T; Obtain distortion factor k, focal distance f, aspect ratio s and principal point coordinate C again
xand C
y, calculate the distance in world coordinates between these 2 according to the value of two in the image chosen group (U, V).
3rd step: correct
To measure assistor as object of reference, human body deformity image height is designated as Hp ', and the lopsided image height of lens correction bar 2 is designated as Ht ', and human body true altitude is designated as Hp, and the true altitude of lens correction bar 2 is designated as Ht.According to Hp ': Ht '=Hp:Ht, then Hp=(Ht × Hp ')/Ht '.
Beneficial effect
Beneficial effect of the present invention is:
A kind of method for designing based on monumented point in the three-dimension measuring system of image of improvement, adopt and measure assistor as auxiliary object of reference, contribute to precisely determining of monumented point, solve the problem that punctuate is inaccurate, and then the problem solving lens distortion, fuzzy pictures and lack object of reference and make measuring result error large.
Accompanying drawing explanation
Fig. 1 is the structural representation of measurement assistor of the present invention.
1-measurement bay, 2-lens correction bar.
Specific embodiments
Measure the height of suspect in video image, below the present invention be described further:
The first step: demarcate
To camera calibration, determine the video camera internal and external parameter of software for calculation.When measuring the people's height in certain monitored picture, by on-the-spot for the visual field that measurement assistor is arranged to this video camera, two people coordinate, one people is traverse measurement frame at the scene, and a people watches video monitoring picture in the wings, coordinates front-end person who to move tester, until this subsidiary device is in original painting middle ideal position, capture present frame, at the world coordinates on adjoint software typing 8 measurement bay summits of this method, as monumented point.
Second step: calculate
Utilize the two-stage calibration method determination video camera internal and external parameter of Tsai: first obtain orthogonal transformation battle array R and translation vector matrix T; Obtain distortion factor k, focal distance f, aspect ratio s and principal point coordinate C again
xand C
y, calculate the distance in world coordinates between these 2 according to the value of two in the image chosen group (U, V).
3rd step: correct
To measure assistor as object of reference, human body deformity image height is designated as Hp '=1.68m, and lens correction bar deformity image height is designated as Ht '=1.95m, and human body true altitude is designated as Hp, and the true altitude of lens correction bar is designated as Ht=2.0m.According to Hp ': Ht '=Hp:Ht, then Hp=(Ht × Hp ')/Ht '=(2.0 × 1.68)/1.95=1.723m.
Claims (1)
1. the method for designing based on monumented point in the three-dimension measuring system of image improved, is characterized in that, comprise the steps:
The first step: typing
To camera calibration, determine the video camera internal and external parameter of software for calculation, when measuring the people's height in certain monitored picture, by on-the-spot for the visual field that measurement assistor is arranged to this video camera, two people coordinate, one people is traverse measurement frame at the scene, one people watches video monitoring picture in the wings, front-end person who is coordinated to move tester, until this subsidiary device is in original painting middle ideal position, capture present frame, at the world coordinates on adjoint software typing 8 measurement bay summits of this method, as monumented point;
Second step: calculate
Utilize the two-stage calibration method determination video camera internal and external parameter of Tsai: first obtain orthogonal transformation battle array R and translation vector matrix T; Obtain distortion factor k, focal distance f, aspect ratio s and principal point coordinate C again
xand C
y, calculate the distance in world coordinates between these 2 according to the value of two in the image chosen group (U, V);
3rd step: correct
Human body deformity image height is designated as Hp ', and lens correction bar deformity image height is designated as Ht ', and human body true altitude is designated as Hp, and the true altitude of lens correction bar is designated as Ht, according to Hp ': Ht '=Hp:Ht, then and Hp=(Ht × Hp ')/Ht '.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510740615.2A CN105389816A (en) | 2015-11-03 | 2015-11-03 | Improved image-based three-dimensional measurement system marking point design method |
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| CN201510740615.2A CN105389816A (en) | 2015-11-03 | 2015-11-03 | Improved image-based three-dimensional measurement system marking point design method |
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| CN105389816A true CN105389816A (en) | 2016-03-09 |
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| CN201510740615.2A Pending CN105389816A (en) | 2015-11-03 | 2015-11-03 | Improved image-based three-dimensional measurement system marking point design method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101033966A (en) * | 2007-04-12 | 2007-09-12 | 上海交通大学 | Photography measurement method of scene of a traffic accident |
| CN102364299A (en) * | 2011-08-30 | 2012-02-29 | 刘桂华 | Calibration technology for multiple structured light projected three-dimensional profile measuring heads |
| WO2015052476A1 (en) * | 2013-10-07 | 2015-04-16 | Isizeme Ltd. | Method for generating body measurement data of a user and system for selecting a set of articles of clothing for a user |
-
2015
- 2015-11-03 CN CN201510740615.2A patent/CN105389816A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101033966A (en) * | 2007-04-12 | 2007-09-12 | 上海交通大学 | Photography measurement method of scene of a traffic accident |
| CN102364299A (en) * | 2011-08-30 | 2012-02-29 | 刘桂华 | Calibration technology for multiple structured light projected three-dimensional profile measuring heads |
| WO2015052476A1 (en) * | 2013-10-07 | 2015-04-16 | Isizeme Ltd. | Method for generating body measurement data of a user and system for selecting a set of articles of clothing for a user |
Non-Patent Citations (2)
| Title |
|---|
| 吴状志 等: "基于图像的人体参数测量系统的设计与实现", 《湖南大学学报（自然科学版）》 * |
| 张彩霞 等: "视频下的动态人体身高测量", 《北方工业大学学报》 * |
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Application publication date: 20160309 |
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