JPH08194809A - 360× monitoring system - Google Patents

Abstract

PURPOSE: To monitor the whole periphery of 360 deg. only by one camera. CONSTITUTION: A mirror 2 is arranged so as to reflect light from a target to be monitored and make the reflected light incident upon a camera 1. A rotation controller 3 rotates the mirror 2 while maintaining a state for making the reflected light from the mirror 2 incident upon the camera 1 and outputs a position signal indicating its rotating position. A picture processor 4 rotates an output picture from the camera 1 at an angle based upon the position signal so that the inclination of the target is set up on a normal position and then extracts a picture of fixed size as a final output picture. Consequently a picture correctly displaying the target is obtained, so that the whole periphery of 360 deg. can be monitored only by one camera.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a single camera with a full circumference of 3
The present invention relates to a 360-degree monitoring system capable of realizing 60-degree monitoring.

[0002]

2. Description of the Related Art Conventionally, there is a 360-degree monitoring system for monitoring the entire circumference of 360 degrees for the purpose of, for example, fire monitoring. FIG. 3 is a block diagram of such a conventional 360-degree monitoring system. 11 is an infrared camera, 12 is an electric pan for rotating the infrared camera 11, and 13 is a camera 11.
It is a cable that transmits the image signal output from the. In this 360-degree monitoring system, when the camera 11 is rotated using the electric pan head 12, the cable 1 is rotated along with the rotation.
Twist occurs in 3. Therefore, in order to suppress such kinking, at least two sets of the camera 11 and the platform 12 are used.
By setting the range in which the two cameras 11 rotate to 180 degrees and sharing the monitoring range with the two cameras 11, 360
I was monitoring the degree.

[0003]

As described above, the conventional 3
The 60-degree monitoring system has a problem that at least two sets of cameras and tripod heads must be used in order to realize 360-degree monitoring around the entire circumference. The present invention has been made in order to solve the above-mentioned problems, and a single camera is used for 360-degree circumference.
It is an object of the present invention to provide a 360 degree monitoring system capable of realizing degree monitoring.

[0004]

SUMMARY OF THE INVENTION The present invention includes a camera for converting light information into an image signal, and a mirror provided so as to reflect light from a monitoring target and allow the reflected light to enter the camera. Rotate the mirror around the optical axis of the reflected light and output a position signal indicating the rotational position of the mirror, a rotation control device for detecting the light from the monitored object over the entire circumference of the optical axis, and an output image of the camera. The image processing apparatus rotates the monitored object at an angle based on the position signal so that the monitored object has a normal inclination, and extracts an image of a predetermined size from the rotated image and outputs the image as an output image.

[0005]

According to the present invention, the mirror reflects the light from the object to be monitored and makes it enter the camera, and the rotation control device rotates the mirror while maintaining this state. Then, the image processing apparatus rotates the output image of the camera so that the monitoring target has a normal inclination, and extracts an image of a predetermined size.

[0006]

1 is a block diagram of a 360-degree monitoring system showing an embodiment of the present invention. Reference numeral 1 is an infrared camera, 2 is a mirror provided so as to reflect light from a monitoring target (not shown) and the reflected light is incident on the camera 1, and 3 is a mirror 2 which rotates the mirror 2 about the optical axis of the reflected light. And a rotation control device that outputs a position signal indicating the rotation position thereof, 4
Is an image processing apparatus that rotates the output image of the camera 1 at an angle based on the position signal so that the monitoring target has a normal inclination, and extracts an image of a predetermined size as an output image.

Next, the operation of such a 360-degree monitoring system will be described. First, the infrared camera 1 is installed facing upward or downward as shown in FIG. Mirror 2
It is inclined at an angle of 45 degrees with respect to the monitoring target and the camera 1, and is arranged so that light from the monitoring target is reflected and reflected light is incident on the camera 1.

The rotation control device 3 including a motor (not shown) and a sensor for detecting a rotational position keeps the above-mentioned state in which the reflected light of the mirror 2 is incident on the camera 1, while the reflected light of the mirror 2 is reflected. Rotate around the optical axis. Thereby, the light from the monitoring target can be detected over the entire circumference of 360 degrees of the optical axis. Next, the image processing device 4 performs image processing on the image signal output from the camera 1 to obtain a final output image.

Since the output image of the camera 1 is obtained from the reflected light of the rotating mirror 2, the monitoring target appearing in the output image is normal due to the change in the relative positional relationship between the camera 1 and the mirror 2. This means that it is inclined by 0 to 360 degrees with respect to the position. Therefore, the image processing device 4 uses the camera 1
The output image of is rotated and image processing is performed so that the inclination of the monitoring target becomes a normal position. Then, the rotation angle at this time is determined based on the position signal output from the sensor of the rotation control device 3.

The position signal indicating the rotational position of the mirror 2 is a signal for outputting a pulse when the mirror 2 reaches a specific position, for example. As a result, since one rotation of the mirror 2 occurs from the output of one pulse to the output of the next pulse, the current position during one rotation can be obtained from this position signal. When the position of the mirror 2 is obtained, the angle necessary for correcting the monitored object to have a normal inclination can be obtained, and therefore the image processing device 4 rotates the output image of the camera 1 by the thus obtained angle.

Then, the image processing device 4 extracts an image of a predetermined size from the rotated image and sets it as a final output image. FIG. 2 is a diagram showing an image processing process of the image processing apparatus 4 as described above.
As shown in FIG. 2C, the output image of the camera 1 in which the thermal pattern for imaging the monitoring target is tilted as shown in FIG. 2A is rotated to have a normal tilt as shown in FIG. The output image is obtained by extracting the image. In this way, one camera can monitor 360 degrees around the entire circumference.

Since the mirror 2 is used, the image obtained by the camera 1 is horizontally reversed. However, the left and right may be reversed for purposes such as fire monitoring, so this is ignored. ing. When this reversal becomes a problem, it can be easily solved by reversing the right and left in the image processing device 4. Further, in the present embodiment, the infrared camera is used as the image pickup device for obtaining the image signal, but it goes without saying that another camera may be used.

[0013]

According to the present invention, the rotation control device rotates the mirror, and the image processing device rotates the output image of the camera at an angle based on the position signal to extract the image, so that the monitored object is correctly detected. Since the reflected image is obtained, it is possible to monitor the entire circumference of 360 degrees with one camera. Further, the cost can be reduced as compared with the conventional case where two cameras are used.

[Brief description of drawings]

FIG. 1 is a block diagram of a 360-degree monitoring system showing an embodiment of the present invention.

FIG. 2 is a diagram showing an image processing process of the image processing apparatus.

FIG. 3 is an external view of a conventional 360-degree monitoring system.

[Explanation of symbols]

1 ... Infrared camera, 2 ... Mirror, 3 ... Rotation control device, 4
... Image processing device.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location // G02B 26/08 E

Claims (1)

[Claims] 1. A camera for converting light information into an image signal, a mirror provided so as to reflect light from an object to be monitored and allow the reflected light to enter the camera, and an optical axis of the reflected light as a center. As a rotation control device for rotating the mirror and outputting a position signal indicating its rotation position, for detecting the light from the monitoring target over the entire circumference of the optical axis, and for the monitoring target output of the camera to have a normal tilt. And an image processing device that rotates the image at an angle based on the position signal so as to extract an image of a predetermined size from the rotated image as an output image.