CN2539957Y

CN2539957Y - Measuring mark for traffic accident scene

Info

Publication number: CN2539957Y
Application number: CN 01248792
Authority: CN
Inventors: 许洪国; 鲁光泉; 任有; 马海琳
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2001-07-19
Filing date: 2001-07-19
Publication date: 2003-03-12
Anticipated expiration: 2011-07-19

Abstract

The utility model relates to a scene measurement apparatus for traffic accidents and comprises 2 to 3 rectangular demarcating boards which are assembled, the same planes which are vertical mutually form after the assembly, and each plane has uniformly distributed deep color grids which contrast the fundamental color of the planes obviously. The quantity of the uniformly distributed deep color grids on each plane is m multiplied n (m = 2, 3, 4; n = 2, 3, 4). After the assembly at the accident scene, the placement scene of the demarcating object together with the accident scene is taken photo, and in accordance with the positions of demarcating points in the photographic photo and the actual coordinates, the photographic photos of the accident scene are demarcated and the spatial position of the accident scene is measured with 2 to 3 pieces of photographic photos demarcated.

Description

The scene of a traffic accident is measured and is demarcated thing

Technical field

The utility model relates to scene of a traffic accident measuring appliance.

Background technology

When the scene of a traffic accident is taken pictures, all need utilize the demarcation thing to carry out the space and demarcate,, utilize two width of cloth or the above scene of the accident of two width of cloth photographs that scenery such as the scene of a traffic accident and vehicle are carried out space measurement according to principle of stereoscopic vision.Because being carried out the space demarcation, photographs needs known actual locus reference point more than six, if utilizing the overcasting staff that generally adopts at present demarcates, need to use several mark posts, for the real space position coordinates that obtains putting on the mark post, position between overcasting staff concerns at the scene, the scene of the accident exploration time is increased, and may influence the measurement result of the scene of the accident because of errors in position measurement between the mark post.Utilize demarcating thing, increases to demarcate with reference to counting and can improve the space measurement precision in actual use when photogrammetric the scene of a traffic accident, and the quantity of reference point is always limited.Experimental result shows, the reference point quantity that increases certain plane can improve with this plane parallel plane on the computational accuracy of distance between two points.

Technology contents

The purpose of this utility model is to overcome existing utilizes the shortcoming that mark post is time-consuming to scene of a traffic accident space measurement, measuring accuracy is low, provides a kind of scene of a traffic accident convenient, fast, that accurately demarcate space, the scene of the accident to measure and demarcates thing.

The purpose of this utility model is achieved in that

The scene of a traffic accident is measured and demarcated thing is to be made of the combinable rectangle scaling board of 2-3 piece, and the assembling back forms orthogonal same level, and the dark colour uniform grid big with the planar primary contrast all arranged on each plane.

The uniform grid quantity of dark colour is m * n (m=2,3,4 in each plane; N=2,3,4).

The design's novel traffic scene of the accident three-dimensional measurement is demarcated thing and is proved through experiment measuring, because several square angle points of known spatial coordinate are all arranged in two or three mutually perpendicular planes of this three-dimensional demarcation thing, use this demarcation thing to measure the scene of a traffic accident, can realize scene of the accident photographs is demarcated fast, can guarantee the measuring accuracy of scene of a traffic accident three-dimensional data again.

Description of drawings

Further specify particular content of the present utility model and operating process thereof below in conjunction with the accompanying drawing illustrated embodiment.

Three-dimensional two plates of Fig. 1 are demarcated a kind of arrangement of thing;

Three-dimensional three plates of Fig. 2 are demarcated a kind of arrangement of thing.

Embodiment

Embodiment shown in Figure 1 is that two combinable rectangle scaling boards constitute, and the assembling back forms orthogonal two same levels, all has on each plane and the big uniform grid of dark colour (as black) of planar primary (as white) contrast.The intersection that forms with two planes and form three rectangular axes with a limit that this line intersects on two planes, common intersection with three lines is that true origin is set up actual coordinates, obtain the coordinate position of each grid angle point in this coordinate system on two planes respectively, these angle points become the spatial reference point of measuring the scene of a traffic accident.

In the actual application of being photographed in the scene of the accident, this demarcation thing be positioned over carry out in the scene of a traffic accident photogrammetric.In analytic process, according to demarcating the position of each angle point on photographs and the actual coordinate of this point on the thing, go out the transformation relation (inside and outside parameter of photographs) of photographs by computed in software, utilize the photographs of two known its transformation relations to calculate the three-dimensional coordinate of the scene of a traffic accident, thereby measure the mutual relationship of scene of a traffic accident spatial location through special software.

Embodiment shown in Figure 2 is that three combinable rectangle scaling boards constitute, and the assembling back forms orthogonal three same levels, and the dark colour uniform grid big with the planar primary contrast all arranged on each plane.Three intersections that form with three planes are three mutually perpendicular coordinate axis, common intersection with three planes is that true origin is set up actual coordinates, obtain the coordinate position of each grid angle point in this coordinate system respectively, these angle points become the reference point of measuring scene of a traffic accident three-dimensional data.This embodiment with the advantage that embodiment 1 compares is: owing to utilize two scaling boards that scene of a traffic accident photographed image is demarcated, reference point is all concentrated on two planes, be unfavorable for improving measuring accuracy distance between two points on the plane vertical with these two planes.Therefore, can further improve the side accuracy of measurement.

Claims

1. the scene of a traffic accident is measured and is demarcated thing, it is characterized in that it being to be made of the combinable rectangle scaling board of 2-3 piece, and the assembling back forms orthogonal same level, and the dark colour uniform grid big with the planar primary contrast all arranged on each plane.

2. the scene of a traffic accident according to claim 1 is measured and is demarcated thing, it is characterized in that the uniform grid quantity of dark colour is m * n (m=2,3,4 in said each plane; N=2,3,4).