JPH05173700A - Position detection system device - Google Patents

Abstract

PURPOSE:To improve the detection precision and reduce the facility cost by calculating the position of a person image on a graphic screen as graphic coordinates and converting the coordinates into real coordinates. CONSTITUTION:An image processor 2 converts the video signal of a photographed body (person) from a camera 1 into a digital signal and projects its image on a display 3. A graphic coordinate arithmetic means 4 finds the position of the photographed body image on the graphic screen. A coordinate transforming means 5 transforms the graphic coordinates obtained by the arithmetic means 5 into real coordinates to detect the position of the photographed body on the real coordinates from equations YT-YC=HtanOY and Yr=HtanOY+ YC (1) and Xr-Xc=(Yr-Yc)/tanQx=HtanOY/tanOX and Xr=HtanOY/tanOX+XC (2). Here, the fitting height H of the camera 1 and the X coordinate Xc and y coordinate Yc are known. The functions for finding the actual positions OY and OX are only found by calibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detecting system device using a computer.

[0002]

2. Description of the Related Art Generally, a person is mainly detected by using a sensor or a combination of a transmitter and a receiver.

According to this method, the detection accuracy can be obtained only at the intervals of installation of the sensor or the receiver, and in the latter case, a person who does not have a transmitter cannot be detected. Further, if the installation interval of the sensors or receivers is narrowed in order to improve the detection accuracy, malfunctions such as a plurality of sensors or receivers once detecting and an increase in the equipment cost of the sensors or receivers cannot be avoided.

[0004]

SUMMARY OF THE INVENTION According to the present invention, the position of a person image in graphics coordinates is calculated in a system for projecting a video signal of a camera for photographing a person on a graphics screen of a computer by using an image processing device. It is an object of the present invention to provide a position detection system device that realizes an improvement in detection accuracy and a reduction in equipment cost by equipping the function for converting and the function for converting graphics coordinates into real coordinates.

[0005]

The present invention relates to a camera for photographing an object to be photographed, an image processing apparatus for converting a video signal photographed by the camera into a digital signal and displaying it on a graphics screen of a computer, and A display for displaying the output of the image processing device on a CRT screen, a graphics coordinate calculating means for obtaining the position of the image projected on the graphics screen, and a graphics coordinate outputted by the graphics coordinate calculating means for real coordinates. And a coordinate conversion means for converting into a position detection system device.

[0006]

In the position detecting system device of the present invention, the object to be photographed is photographed by the camera, the video signal photographed by the camera is converted into a digital signal, and the digital signal is displayed on the graphics screen of the computer. The image is displayed on the CRT screen, the position of the image projected on the graphics screen is obtained, and the graphics coordinates output by the graphics coordinate calculating means are converted into real coordinates.

[0007]

EXAMPLE An example of the present invention will be described below. Figure 1
A camera 1 for photographing a subject, an image processing device 2 for converting a video signal photographed by the camera 1 into a digital signal and displaying it on a graphics screen of a computer, and an output of the image processing device 2 are displayed on a CRT screen. Display 3
And a graphics coordinate calculation means 4 for obtaining the position of the image projected on the graphics screen, and a coordinate conversion means 5 for converting the graphics coordinates output by the graphics coordinate calculation means 4 into real coordinates. This embodiment is a position detecting system device, and in the present embodiment, a person on a graphics screen equipped with a system for projecting a video signal of a camera for photographing a person on the graphics screen of a computer using the image processing device 2 A position detection system comprising a graphics coordinate calculating means 4 for obtaining a position of an image and a coordinate converting means 5 for converting graphics coordinates into real coordinates, wherein the position of a human image calculated by the graphics coordinate calculating function is converted by the coordinate converting function. Convert to real coordinates and detect the position.

That is, FIG. 1 is equipped with a system for projecting a video signal of a camera 1 for photographing a person on a graphics screen of a computer by using an image processing device 2, and a camera 1 for photographing a person and a digital image signal are taken. An image processing device 2 for converting into a signal, a display 3 for displaying an output of the image processing device 2 on a screen, and a graphics coordinate calculating means 4 for obtaining a position of a person image on a graphics screen.
And a coordinate detection means 5 for converting graphics coordinates into real coordinates.

In the position detection system thus constructed, the camera 1 inputs the image signal of a person to the image processing device 2, the image processing device 2 outputs the digitally processed image signal to the display 3, and the graphics coordinates are displayed. The calculation means 4 acts on the calculation of the position of the person on the graphic screen of the display 3, and the coordinate conversion means 5 detects the position of the person on the real coordinates.

3 to 6 show the method, which is calculated by the following equation.

[0011] _{Y T -Y C = Htan O Y} Y T = Htan O Y + Y C ... (1) X T -X C = (Y T -Y C) / tan Q X = Htan O Y / tan O X X _T = Htan O _Y / tan O _X + X _C (2) In equations (1) and (2), the mounting height H of the camera and x
The coordinate X _C and the y coordinate Y _C are known. Therefore, O _Y and O
Function to obtain _X from graphics coordinates O _y = f (y)
, O _X = g (x) may be determined by calibration.

[0012]

According to the present invention, it is possible to improve the detection accuracy of the position detection system and reduce the equipment cost.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a position detection system device showing an embodiment of the present invention.

FIG. 2 is a flow explanatory diagram showing a processing procedure of position detection.

FIG. 3 is an explanatory diagram showing the principle of position detection.

FIG. 4 is an explanatory diagram of position detection.

FIG. 5 is an explanatory diagram of position detection.

FIG. 6 is an explanatory diagram of position detection.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Camera 2 ... Image processing apparatus 3 ... Display 4 ... Graphics coordinate calculation means 5 ... Coordinate conversion means

Claims (1)

[Claims] 1. A camera for photographing a subject, an image processing device for converting a video signal photographed by the camera into a digital signal and displaying it on a graphics screen of a computer, and an output of the image processing device for a CRT screen. A display for displaying, a graphics coordinate calculating means for obtaining the position of the image projected on the graphics screen,
Coordinate conversion means for converting the graphics coordinates output by the graphics coordinate calculation means into real coordinates,
A position detection system device comprising: