JPH0865551A - View range display device for TV camera - Google Patents

Abstract

(57) [Summary] [Purpose] When a disaster such as a fire is detected by a high-altitude camera, the address of the point of occurrence is specified, and the relevant departments are contacted or countermeasures are expedited. [Arrangement] In order to achieve the above object, a map is displayed on a display device using a map database. Further, the pan, tilt, and zoom control signals from the high-altitude camera are loaded into the processing device, and the visual field range is processed based on the preset camera installation position (coordinates on the map) and the dimensions of the high-altitude camera imaging surface. Calculated with, and display the visual field range on the map displayed on the display device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for displaying an image of a television camera installed at a high place for surveillance.

[0002]

2. Description of the Related Art In the prior art, a place name is preset in accordance with the control data of a TV camera installed at a high place, and the camera is currently taking an image from the control data such as pan and tilt of the high place camera. This is a method of searching for a place name and displaying the place name on the camera image, without linking to a map. For example, this conventional example is shown in FIG.

[0003]

With the above-mentioned conventional technique, it is difficult to read the address and address of the target building from the image captured by the high-position television camera.

An object of the present invention is to eliminate these drawbacks and provide information on the address and address of a target building.

[0005]

In order to achieve the above object, the present invention displays an area map showing a map on a display device as shown in FIG. 1 and showing a visual field range of a television camera installed at a high place. By overlapping and displaying, the image pickup area of the high-altitude camera can be visually recognized. In order to calculate the visual field range of the television camera, the control signal of the television camera is read and the signal processing shown in FIG. 3 is performed. That is, the display coordinates are obtained by performing interpolation processing for obtaining the focal length from the zoom signal, coordinate rotation processing, and clipping processing for cutting a vector outside the display area. Then, for display on the display device, the coordinates are converted into client coordinates, that is, the coordinates of the display, and displayed.

[0006]

[Function] The portion of the image captured by the television camera is shown on the map.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 denotes a TV camera installed at a high place, for example, a camera installed on a rooftop of a building, which remotely controls pan, tilt, and zoom under the control of a high altitude camera control console 2. Reference numeral 3 denotes a visual field range display processing unit, which includes pan, tilt, and zoom control signals,
Calculate the display range of the high altitude camera image from the high altitude camera installation position. Reference numeral 4 denotes a high-altitude camera image display unit, which sends a signal of the high-altitude camera image to the display control unit 5. 6 is a data base in which a paper map is converted into vector data and stored in an external storage device. Reference numeral 7 denotes a database access unit which controls retrieval of a data base on an external storage device. A map vector display unit 8 displays a map of a specific area. A display device 9 displays an image of the high-altitude camera, a map, and a visual field range of the high-altitude camera.

This operation will be described below. Under the control of the map vector display unit 8, the map vector data (the starting point and the ending point X and Y coordinates of the line segment for displaying the map) of the specific area is searched from the data base 6 and displayed on the display device 9. . The video imaged by the high-altitude camera 1 is displayed on the display device by the camera video display unit 4. Next, the visual field range display processing unit 3 issues a pan / tilt / zoom control value information request for the high altitude camera to the high altitude camera control console 2, and when the control value information is received, the visual field range is calculated ( Then, as shown in FIG. 1, the visual field range is displayed by hatching on the map. The video signal of the high-altitude camera 1 is recorded on the VRAM (not shown) of the display controller 5, and the camera image is also displayed on the display device. As a result, it is possible to visually understand the correspondence between the image of the high-altitude camera and the map.

This concept can be applied not only to the field of view of the camera but also to the case where the directional antenna is rotated to communicate with the wireless station in the intended direction.

In the calculation formula at this time, assuming that pan is 0 °, tilt = α, camera height = Z, camera image pickup surface vertical dimension = KV, and focal length f, the X coordinate of the visual field range, XP ₁ And XP ₂ are calculated by the equations (1) and (2).

[0011]

[Equation 1]

[0012]

[Equation 2]

However, the range of α is 1 / tan (Z / maximum X coordinate) <α ≦ 90. The Y coordinate of the visual field range, YP ₁ and YP ₂ are obtained by the equations (3) and (4).

Next, (1), (2), (3) and (4)
The coordinates when the X and Y coordinates of the visual field range obtained by the expression are rotated by the pan angle θ are obtained (5).

[0015]

(Equation 3)

[0016]

[Equation 4]

[0017]

(Equation 5)

[0018]

By displaying a map on the display device and superimposing the visual field range of the television camera on the map, the image captured by the television camera and the position on the map are associated with each other. By using this function for monitoring a disaster or the like, when a disaster such as a fire occurs, the address of the occurrence point can be specified from the map, so that the response can be speeded up.

[Brief description of drawings]

FIG. 1 is a diagram showing a display example on a display device of the present invention.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is an operation flowchart of the present invention.

FIG. 4 is a diagram showing a display example on a display device of a conventional example.

[Explanation of symbols]

 1 TV camera installed in a high place 2 Control console of a high place camera 3 View range display processing unit 4 High altitude camera image display unit 5 Display control unit 6 Database unit 7 Database access unit 8 Map vector display unit 9 Display device

Claims (1)

[Claims] 1. A map registered in advance in a storage device is displayed on a display device, a visual field range is calculated by a processing device based on a control signal from a television camera control device, and the map is displayed on the display device. A field-of-view display device for a television camera, characterized by displaying an area diagram showing a field-of-view range on a displayed map.