JPH0969966A - Monitor camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To switch images fast by composing the monitor camera of a mechanism part which rotates reciprocally on an axis perpendicular to the optical axis of the camera and an arithmetic part which performs conversion and output corresponding to a video signal. SOLUTION: The main body of a vertical rotary motor 4 is fixed in space and the camera 2 is fitted to its output shaft so that the optical axis of the camera 2 is perpendicular to the output shaft. A horizontal rotary motor 3 is fixed in space and a mirror 1 is fitted to its output shaft. The camera 2 photographs a mirror image reflected by the mirror 1. When the mirror 1 is rotated by the horizontal rotary motor 3, photographing is performed as if the camera were looking around in a horizontal direction 13. Further, when the camera 2 is moved by placing the vertical rotary motor 4 in operation, photographing is carried out as it the camera were looking around in a vertical direction 14. Further, the arithmetic part 5 stores the inputted video signal 5 in an image memory and changes the order of read addresses to rotate the image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance camera.

[0002]

2. Description of the Related Art Recently, a large number of surveillance cameras have been installed to prevent crimes, detect crimes in large stores, and prevent crimes. In addition, early detection of abnormalities at the time of disaster with surveillance cameras,
The range of use is expanding to monitor the condition of patients in hospitals.

There are two types of surveillance cameras, one for fixedly photographing only a specific portion and the other for photographing a wide area by rotating or moving the camera. The latter is often used for surveillance cameras used to detect and deter crime. If you look at a wide area with a surveillance camera and feel any abnormality, fix the field of view and record. Or, by a report from the site, quickly point the surveillance camera at the target point and start shooting. It is used in such a way.

Also, in large stores, pachinko parlors, etc., since there are many points to be monitored, many surveillance cameras are also installed.

A conventional surveillance camera will be described with reference to FIG. FIG. 4 is a perspective view of a typical configuration of a conventional surveillance camera.

The camera 41 displays an image in the vertical direction (arrow 2) 4
Vertical rotation motor 43 to move to 9 for shooting
It is attached to the output shaft of. The main body of the vertical rotation motor 43 is fixed to the bracket 47,
Reference numeral 7 indicates the image captured by the camera 41 in the horizontal direction (arrow 1) 4
It is mounted on the output shaft of a horizontal rotary motor 42 for moving to 8.

[0007] The horizontal rotation continues to rotate in the same direction. The cable 2 (44) such as the power cable of the camera body, the signal cable, the power cable of the vertical rotation motor, and the signal cable is connected to the outside by the cable 1 (45) via the slip ring 46 so as not to be twisted by the horizontal rotation. ing.

Since the conventional surveillance camera is constructed as described above, it has the following problems. Since it rotates including the camera body and the vertical rotation motor, it is large and heavy and cannot operate at high speed. Since a slip ring is used, the signal is noisy and the durability is poor. A high output motor is required for high speed operation, and a slip ring is used, which makes the motor expensive. The side where the camera is not facing is a blind spot.

[0009]

Since the horizontal rotation of the camera body, the vertical rotation motor, and the bracket causes a problem, the camera body, the vertical rotation motor, and the bracket may be fixed in a space. An object of the present invention is to provide a surveillance camera capable of moving an image of a camera in a horizontal direction while fixing a camera body, a vertical rotation motor and a bracket.

[0010]

[Means for Solving the Problems] A mirror, a mechanism for rotating the mirror, a camera for capturing an image reflected on the mirror, and a reciprocating rotary camera about an axis perpendicular to the optical axis of the camera. The surveillance camera is composed of a mechanical unit for moving and a calculation unit for converting and outputting according to a video signal from the camera. A mechanism unit for rotating a mirror or a mirror is provided with a detection unit 1 for detecting a rotation angle of the mirror, and a mechanism unit for rotating and reciprocating the camera around an axis in a direction perpendicular to the optical axis of the camera or the camera. A detection unit 2 for detecting a rotation angle of the camera is provided, and a detection unit 1 and a calculation unit for converting and outputting a video signal from the camera according to the angle signal of the mirror of the detection unit 2 and the angle signal of the camera. To do. The detection unit 1 and the detection unit 2 have a control unit that controls the input of the image signal to the calculation unit in accordance with the angle signal of the mirror and the angle signal of the camera, and the correspondence between each angle signal and the input timing. The relationship to be made adjustable.

[0011]

EXAMPLE A typical example of the present invention will be described below with reference to FIG. FIG. 1 is a schematic diagram showing the configuration of an embodiment of the first surveillance camera, and the vertical direction in the figure is the vertical direction.

The main body of the vertical rotation motor 4 is fixed in the space, and the camera 2 is attached to the output shaft so that the optical axis of the camera 2 is perpendicular to the output shaft. The horizontal rotation motor 3 is fixed in the space, and the mirror 1 is attached to the output shaft thereof. 8 is a video signal cable,
Reference numerals 9 and 10 are motor cables, and 7 is an output from the calculation unit 5.

The camera 2 captures a mirror image of the mirror 1.
When the mirror 1 is rotated by the horizontal rotation motor 3, it is possible to take an image as if looking around in the horizontal direction (arrow 1) 13. Further, if the vertical rotation motor 4 is operated and the camera 2 is moved, it is possible to take a picture as if looking around in the vertical direction (arrow 2) 14.

When the mirror image reflected on the mirror 1 is photographed by the camera 2, the left and right sides of the image seen by the naked eye are interchanged.
As the mirror 1 rotates, the image will appear to rotate in a plane perpendicular to the optical axis of the camera 2.

When the position of the mirror 1 in FIG. 1 is set to 0 degree and the subject 1 (11), which is visible to the naked eye in FIG. 5, is photographed, it looks like FIG. When the mounting direction of the camera 2 is changed, it looks as shown in FIGS. 7 and 8, but it is assumed that the camera 2 is mounted in the direction as shown in FIG. When the mirror 1 rotates 180 degrees and the subject 2 (12) that looks like FIG. 9 with the naked eye is photographed, the image looks like FIG. 10. Although not shown, if there is a subject 2 (12) at a position where the mirror 1 is turned 90 degrees in the direction of the arrow, it should look like FIG. 11.

Actually, not only the image is simply rotated, but the center of rotation of the image is determined by the positional relationship between the intersection of the optical axes of the mirror 1 and the camera 2 and the rotation axis of the mirror 1.

This is very inconvenient for the surveillance camera. In the present invention, the video signal is processed to obtain a normal image. When the video signal is processed and reproduced on the monitor, it is not difficult to rotate or move the image with respect to the original image. For example, in the processing to prevent camera shake that is installed in video movies, the video signal is processed so that a specific point of the image captured by the camera is constrained to one point on the monitor so that the image does not shake on the monitor. There is.

In the arithmetic unit 5 of the present invention, for example, the image signal can be rotated by storing the captured video signal in the image memory and changing the order of the read addresses. Various other methods are conceivable, but they will not be described in detail because they are not the purpose of the present invention.

Next, an embodiment of the second surveillance camera will be described with reference to FIG. FIG. 2 is a schematic diagram showing the configuration of the second surveillance camera, and the vertical direction in the figure is the vertical direction.

The second surveillance camera includes a detection unit 1 (21) for detecting the rotation angle of the mirror 1 in the first surveillance camera,
Detection unit 2 (22) for detecting the rotation angle of the camera 2
Is added, and the function of processing the video signal corresponding to the rotation angles of the mirror 1 and the camera 2 is added to the calculation unit 25. 23 and 24 are angle signal cables, and 26 and 27.
Is an angle signal. Description of the same parts as those in FIG. 1 will be omitted.

Since the first surveillance camera cannot know the rotation angle between the mirror 1 and the camera 2, the rotation angle between the mirror 1 and the camera 2 is predicted when the arithmetic unit 5 processes the video signal. ing. A sudden situation occurs, and the mirror 1 and the camera 2
When the rotation angle of is deviated from the prediction of the calculation unit 5, the image reproduced on the monitor is tilted vertically.
In the second surveillance camera, the rotation angles of the mirror 1 and the camera 2 are fetched into the arithmetic unit 25 so that the arithmetic processing of the video signal of the arithmetic unit 25 can be accurately performed according to the orientations of the mirror 1 and the camera 2. Has become.

Next, an embodiment of the third surveillance camera will be described with reference to FIG. FIG. 3 is a schematic diagram showing the configuration of the third surveillance camera, and the vertical direction in the figure is the vertical direction.

The third surveillance camera is the second surveillance camera to which a control unit 31 for taking in a video signal from the camera to the arithmetic unit is added. Description of the same parts as those in FIG. 2 will be omitted. The control unit 31 takes in an image by an adjustment input 33 from an adjustment cable 32. For example, it is possible to capture an image when the orientation of the mirror is 0 degree, or to capture an image when the orientation of the mirror is 180 degrees. In the first and second surveillance cameras, the transition of images and the rotation of the mirror and the camera have a slight delay, but they are almost in synchronization.

In the third surveillance camera, the control unit 31 described above is used.
By adding, it is possible to capture images asynchronously. In other words, the image can be fixed by rotating the mirror at a high speed and capturing an image for each round of the mirror. This means that the images can be switched very quickly, and the adjustment input 33
If is changed from 0 degree to 180 degrees, it can be changed in a time for the mirror to rotate 180 degrees. For example, a mirror 3,000r
When rotated at pm, it only takes 0.01 seconds to switch a 0 degree image to a 180 degree image. Further, if the input is set to 0 degree, 10 degrees, 20 degrees, etc. by the adjustment input 33, a plurality of images can be taken by one camera almost at the same time. In FIG. 3, the image signal is input to the calculation unit by the control unit 31, but the same applies to a mode in which the control unit 31 inputs a signal to the camera and opens the shutter.

[0025]

The present invention is constructed as described above,
In the first surveillance camera, by making the mirror lightweight, the image switching can be performed faster than in the conventional surveillance camera. Since the camera body and the motor body do not have to rotate continuously, a slip ring is not required, which is inexpensive and highly reliable.

In the second surveillance camera, a mirror and a rotation angle detection unit for the camera are added to the first surveillance camera, and the image signal can be processed using the angle signal. The processing of the image signal is accurate.

In the third surveillance camera, since a control unit capable of capturing images at an arbitrary rotation angle of the mirror is provided, switching of images is fast, and a single camera can capture a plurality of images. No blind spots can occur.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a first surveillance camera according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a second surveillance camera according to the embodiment of the present invention.

FIG. 3 is a schematic diagram of a third surveillance camera according to the embodiment of the present invention.

FIG. 4 is a perspective view of a surveillance camera according to the related art.

[Figure 5] Image

FIG. 6 image

FIG. 7 image

FIG. 8 image

FIG. 9 image

FIG. 10 image

FIG. 11 image

[Explanation of symbols]

 1 mirror 2 camera 3 horizontal rotation motor 4 vertical rotation motor 5 arithmetic unit 6 video signal 7 output 8 video signal cable 9 motor cable 10 motor cable 11 subject 1 12 subject 2 13 arrow 1 14 arrow 2 21 detector 1 22 detector 2 23 angle signal cable 1 24 angle signal cable 2 25 computing unit 26 angle signal 2 27 angle signal 1 31 control unit 32 adjustment cable 33 adjustment input 41 camera 42 horizontal rotation motor 43 vertical rotation motor 44 cable 2 45 cable 1 46 slip ring 47 Bracket 48 arrow 1 49 arrow 2

Claims (3)

[Claims] 1. A mirror, a mechanism for rotating the mirror, a camera for capturing an image reflected on the mirror, and a reciprocating motion of the camera about an axis perpendicular to the optical axis of the camera. A surveillance camera comprising a mechanical section and an arithmetic section for converting and outputting a video signal from the camera. 2. A mechanism for rotating a mirror or a mirror provided with a detector 1 for detecting a rotation angle of the mirror, and a mechanism for rotating and reciprocating a camera around an axis perpendicular to an optical axis of the camera. A detection unit 2 for detecting the rotation angle of the camera is provided in the camera unit or the camera, and a calculation for converting and outputting a video signal from the camera in accordance with the angle signal of the mirror of the detection unit 1 and the detection unit 2 and the angle signal of the camera is output. The surveillance camera according to claim 1, wherein the surveillance camera comprises a unit. 3. A control unit for controlling input of an image signal to a calculation unit corresponding to the angle signals of the mirrors of the detection units 1 and 2 and the angle signal of the camera, and the respective angle signals. The surveillance camera according to claim 2, wherein the corresponding relationship of the input timing is adjustable.