JPH0968741A - Surveillance camera system - Google Patents

Abstract

(57) [Summary] [Purpose] Automatically record on photographic film only when a person appears. [Structure] A camera 4 equipped with an image pickup device 4g photographs a monitoring target and outputs an image signal thereof. A / D converter 10d
Converts the signal into a digital signal, and the storage controller 10b
Stores an image signal for one frame in the memory 10a every 30 seconds, for example. For example, 25 seconds after the image signal is stored in the memory, the image identifying unit 10c sequentially receives the image signals for one frame supplied from the A / D converter 10d, and at the same time reads the image signal from the memory 10a, The difference between the image signals is calculated for each corresponding pixel.
Then, the total number of non-matching pixels whose difference is not zero is obtained, and when the total number exceeds the reference value, it is determined that the image of the person is included in the most recent frame, and the shutter 4d is opened through the shutter drive unit 8a. , Expose the photographic film and let it take a picture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance camera system, and more particularly to a surveillance camera system installed at a specific place and recording an image on photographic film as needed.

[0002]

2. Description of the Related Art In banks, supermarkets and the like, small television cameras are installed in various places to monitor illegal intrusion and illegal activities. Images taken by a television camera are displayed on a television monitor placed in an office or the like, and at the same time, recorded on a video tape recorder. Then, in a case where a fraudulent act or the like is carried out and is to be confirmed, the stored video tape is taken out, the recorded image is reproduced, and the check is carried out. Not only the TV camera but also the camera is installed separately from the TV camera or integrated with the TV camera, and if necessary, the shutter of the camera is remotely operated,
It is also used to take pictures of suspicious people. Also, a monitoring system has been developed in which, instead of a person watching a monitor television and operating a shutter, a human detection system using infrared rays is provided, and this system detects a person and automatically releases the shutter. .

[0003]

In the above-mentioned method of recording on a video tape, the video tape is inexpensive and can be reused, so that image recording for a long time can be performed at low cost. However, there are many cases in which the quality of the reproduced image is not sufficient and the projected person or the like cannot be clearly identified. On the other hand, in the case of a system in which a camera is combined, it is necessary for the monitor to constantly monitor the TV monitor and operate the shutter of the camera, which causes labor costs and a large burden on the monitor. In addition, there is a problem that reliability is not necessarily high because a person judges and records the data. In addition, with a system that uses a human detection system using infrared rays, it is difficult to distinguish between humans and animals or objects that generate some kind of heat. There is a problem that it ends up.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a surveillance camera system in which a shutter is automatically released only when a person appears to record an image on a photographic film.

[0005]

To achieve the above object, the present invention provides a surveillance camera system including an optical system for forming an image of a subject on a photographic film, and a shutter for exposing the photographic film. In, a light receiving element on which a subject image obtained through the optical system is formed, a first signal output from the light receiving element, and a predetermined time after the first signal is output from the light receiving element And a second signal, and outputs a release signal when a predetermined comparison result is obtained, and a shutter is opened to expose the film when the signal processing unit outputs the release signal. And shutter driving means.

According to the present invention, the light receiving element is composed of an image pickup element, and the signal processing means outputs a first video signal output from the image pickup element and a predetermined time after the first video signal is output. It is characterized by comprising image processing means for generating a release signal based on the second video signal output from the image pickup device. According to the present invention, the image processing means further includes a storage means for storing an image signal output from the image pickup device, and a first output by the image pickup device.
Storage control means for storing the image signal of the first image signal in the storage means, a second image signal output from the image sensor after a predetermined time from the first image signal, and the first image stored in the storage means. It is characterized by further comprising image identifying means for comparing the signal and outputting a release signal when a predetermined comparison result is obtained. The present invention is also characterized in that the image pickup device has a plurality of pixels arranged in a matrix and outputs a signal corresponding to the brightness of light incident on each pixel as an image signal. In the present invention, the image identifying means may compare the first image signal and the second image signal to identify a specific image not included in the first image signal but included in the second image signal. It is characterized in that the predetermined signal is output when detected. According to the present invention, the image identifying means compares the first image signal and the second image signal for each corresponding pixel, and the total number of pixels in which the sizes of the two image signals do not match is used as a reference. It is characterized in that the presence or absence of the specific image is judged by comparing with a value. The present invention is also characterized in that the storage means stores the image signal output by the image sensor as the first image signal at predetermined time intervals. The present invention also provides that the specific image has a dimension of an object represented by the image of 1000 m.
It is characterized by being larger than m and smaller than 2200 mm. In the invention, the optical system may further include a taking lens and light emitted from the taking lens to the photographic film.
And an optical path splitting means for splitting the optical path into a second optical path reaching the image pickup device. The present invention is also characterized in that the optical system further includes, in the second optical path, a re-imaging lens for re-imaging a subject image formed by the taking lens on the image sensor.

According to the present invention, the light receiving element is composed of a photometric sensor for measuring the amount of light in the image pickup area imaged by the optical system, and the signal processing means is the first photometric sensor for measuring. Calculating means for calculating the rate of change of the light quantity by dividing the light quantity difference between the second light quantity measured by the photometric sensor after a predetermined time from the time point of measuring the first light quantity by the first light quantity. It is characterized in that it comprises a judging means for judging whether the calculated change rate of the light quantity is a preset value or more and outputting a release signal when the rate of change is a preset value or more. The present invention is also characterized in that the photometric sensor has a light receiving area corresponding to the size of a subject to be monitored which is imaged by the optical system. According to the present invention, the optical system further includes a photographing lens and an optical path splitting unit that splits the light emitted from the photographing lens into a first optical path to the photographic film and a second optical path to the photometric sensor. It is characterized by The present invention also provides that the optical system further comprises:
A re-imaging lens for re-imaging the subject image formed by the taking lens on the photometric sensor is provided in the second optical path.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. FIG. 2 is a block diagram showing an example of a surveillance camera system according to the present invention. This surveillance camera system 2
It is composed of a camera 4, a camera controller 8, an image processing device (signal processing means) 10, a personal computer 14, and the like. The camera 4 is installed, for example, in the vicinity of a safe installed in an office so as to capture an image of a person who approaches the safe. The periphery of the safe is illuminated by a lighting device 6 so that it can be photographed even at night. The camera 4 is a so-called compound camera, and has a function as a television camera and a function as a camera.

As shown in FIG. 3, the optical system of the camera 4 is
Taking lens 4a having a zoom function, and taking lens 4a
And a half mirror 4b for splitting the light emitted from the taking lens 4a for splitting the light path.
A photographic film (silver salt film) 4c is arranged at a position where the subject image of the taking lens 4a that passes through the half mirror 4b is formed, and a shutter 4d is arranged in front of the film 4c. Further, a condenser lens 4e and a mirror 4f that redirects the light transmitted through the condenser lens 4e by 90 degrees are arranged on the reflection optical path of the half mirror 4b.
Further, on the reflection optical path of the mirror 4f, an image pickup device 4g such as a CCD and a re-imaging lens 4h for re-imaging the subject image of the photographing lens 4a on the image pickup device 4g are arranged.

The image pickup device 4g functions as the image signal generating means of the present invention, and is constructed by arranging a large number of photosensors in a matrix, and an image formed by the re-imaging lens 4h is formed on the image forming surface thereof. , Is divided into pixels corresponding to each photosensor, and a signal representing the brightness of each pixel is output as an image signal for each frame (that is, one frame).

The camera controller 8 sends a predetermined signal to the camera 4 to open / close the shutter 4d, wind the film 4c, and control the zoom magnification of the taking lens 4a. The camera controller 8 also supplies power to the camera 4 and the lighting fixture 6.

The image processing apparatus 10 uses an image pickup device 4g through a camera controller 8 as described later in detail.
When a person is photographed by receiving and storing the image signal from the device and performing predetermined image processing, the controller 8 outputs a signal instructing the opening of the shutter 4d. A television monitor 12 is connected to the image processing device 10,
The image signal from the image sensor 4g of the camera 4 is supplied together with the synchronization signal, and the image captured by the camera 4 is displayed as a moving image. The observer may monitor the monitor 12 if necessary.
It is also possible to monitor by looking at the image displayed in
You can also check that the system is working properly.

The personal computer 14 supplies data to the image processing apparatus 10 to set various conditions for image processing, or, if necessary, the image processing apparatus 10.
It is for checking the operation of.

FIG. 1 is a functional block diagram showing the main part of the surveillance camera system 2. As shown in this figure, the image processing apparatus 10 is composed of a memory 10a, a storage control unit 10b thereof, an image identification unit 10c, and an A / D converter 10d. The A / D converter 10d is
An analog image signal is received from the image sensor 4g of the camera 4, converted into a digital signal, and output. Storage control unit 1
0b receives the digitized image signal from the A / D converter 10d, and stores the image signal for one frame in the memory 10a at a constant time interval of several tens of seconds to several minutes, for example, a time interval of 30 seconds. Store. When the storage control unit 10b has written an image signal in the memory 10a, and a time slightly shorter than the predetermined time interval, for example, 25 seconds, has elapsed,
The processing start signal is output to the image identification unit 10c.

When the image identification section 10c receives the processing start signal from the storage control section 10b, the A / D converter 10d.
While sequentially receiving the image signal of the latest frame from, the image signal for one frame stored in the memory 10a is sequentially read, and the difference in the magnitude of both image signals is calculated for each set of pixels corresponding to both frames. calculate. When the difference between the two image signals is not zero, that pixel of the latest frame does not match the corresponding pixel of the previous frame stored in the memory 10a, and thus of the image not included in the previous frame. Will be things. The image identification unit 10c calculates the total number of such mismatched pixels. After that, the total number of non-matching pixels is compared with a predetermined reference value corresponding to the size of the subject to be identified, and if the total number exceeds the reference value,
The camera controller 8 sends a signal instructing to open the shutter.
To the shutter drive unit 8a.

The storage control unit 10b stores an image signal in the memory 10a at the fixed time intervals (30 seconds in this example).
Since the processing start signal is output after a predetermined time has elapsed, the processing start signal is output at the above-mentioned fixed time intervals.
0c performs the above-described image identification processing at each time interval.

Next, the operation will be described. Hereinafter, the functional block diagram of FIG. 1 will be mainly referred to, and further the flowchart of FIG. 4 will be referred to. When the power of the system is turned on, first, the personal computer 14 operates according to a predetermined program, outputs a predetermined signal, and causes the zoom control section 8b of the controller 8 to move the photographing lens 4a (FIG. 3). The zoom magnification is set to a predetermined value, and the image identification unit 10c
To the reference value corresponding to the size of the subject to be identified. On the other hand, when the power is turned on, power is supplied from the controller 8 to the lighting fixture 6, and the lighting fixture 6
Lights up and the area around the safe in the office is illuminated.

In this state, a subject image near the safe formed by the camera 4 and formed by the taking lens 4a is
The light enters the re-imaging lens 4h via the half mirror 4b and the condenser lens 4e, and is re-imaged on the image sensor 4g by the re-imaging lens 4h. The image pickup device 4g divides the image into pixels and outputs a signal representing the brightness of each pixel as an image signal for each frame. This image signal is sent to the image processing apparatus 10 through the controller 8 together with the synchronization signal, and further sent to the monitor 12.

As a result, first, an image near the safe is displayed as a moving image on the screen of the monitor 12. As described above, the supervisor can monitor the image displayed on the monitor 12 as necessary and can also confirm that the system is operating properly.

On the other hand, the A / D converter 1 of the image processing apparatus 10
0d converts an analog image signal from the image sensor 4g of the camera 4 into a digital signal and outputs it. Storage control unit 1
0b receives the digitized image signal from the A / D converter 10d, and stores the image signal for one frame in the memory 10b.
a (step S1). The image sensor 4g outputs image signals for one frame in the following order.
The photosensors of the image pickup device 4g are arranged in a matrix as described above, and therefore the array of pixels is also in a matrix as shown in FIG. Then, the image pickup device 4g moves from the upper left pixel P (1,1) to the right P (1,2), P (1,
3), ..., The signal of each pixel is output in this order, and when the row ends, the signal of each pixel in the row below it, that is, the row starting from the pixel P (2,1) is sequentially output, and that row is When you are finished, proceed to the next line. Therefore, the storage control unit 10b stores each image signal in the memory 10a in such an order. The storage control unit 10b outputs a processing start signal to the image identifying unit 10c when 25 seconds have elapsed after storing the image signal for one frame in the memory 10a (step S2).

When the image identifying section 10c receives this signal, it receives the image signals of the pixels of the latest frame from the A / D converter 10d in the above-described order (step S).
3), the image signal of each pixel for one frame stored in the memory 10a is sequentially read in the same order as the image signal from the A / D converter 10d, and for each group of corresponding pixels of both frames, A difference in magnitude between the two image signals is calculated (step S4). Then, depending on whether or not the difference is zero, the memory 1
The pixel of the latest frame, which is different from the pixel of the frame stored in 0a, that is, the total number of unmatched pixels is calculated (step S5). Then, this total number is compared with a predetermined reference value corresponding to the size of the subject to be identified (step S6).

If a person is not approaching the safe at the time when the image identifying section 10c starts processing, A
The image represented by the image signal from the / D converter 10d does not include the image of a person, and therefore the image is stored in the memory 1
It exactly matches the image represented by the image signal stored in 0a. Therefore, the difference between each pair of corresponding pixels in both images is always zero, and thus the total number of non-matching pixels whose image signal difference does not become zero is also zero. As a result, this total becomes less than or equal to the reference value, and the image identifying unit 10c does not output a signal for instructing the controller 8 to open the shutter.

The storage control unit 10b receives the image signal from the A / D converter 10d again after 30 seconds have passed since the image signal for one frame was stored in the memory 10a, and a new image signal for one frame was received. Is stored in the memory 10a (step S1). After that, as described above, the storage control unit 10b outputs the processing start signal to the image identification unit 10c when 25 seconds have elapsed (step S2).

When the image identifying section 10c receives this signal, it receives the image signal of the latest frame from the A / D converter 10d in the same manner as described above (step S
3), the image signals for one frame stored in the memory 10a are sequentially read, and for each set of corresponding pixels in both frames, the difference in the image signal magnitudes of those pixels is calculated (step S4). . Then, the total number of the non-matching pixels whose difference is not zero is obtained (step S5), and this total number is compared with a predetermined reference value corresponding to the size of the subject to be identified (step S6).

If a person is approaching the safe at the time when the image identifying section 10c starts the processing, the image represented by the image signal from the A / D converter 10d includes the person's image. Therefore, the image is different from the image represented by the image signal stored in the memory 10a in the human image portion. Therefore, in the part of the image of the person,
The difference between the image signals of the corresponding pixels does not become zero, and the non-matching pixels of which the difference does not become zero in the latest frame are the pixels forming the human image. Since the total number of pixels forming the image of the person becomes a value corresponding to the size of the image of the person, the total number exceeds the reference value, and the image identification unit 10c causes the controller 8 to release the shutter. Outputs a signal instructing opening.

The shutter drive section 8a of the controller 8 is
When this signal is received, the shutter 4d is driven and opened for a predetermined time to expose the film 4c. as a result,
An image of a person approaching the safe is recorded on the film 4c. The image obtained by developing this film is extremely sharp, unlike when recorded on a video tape,
You can clearly identify who is approaching the safe. The winding control unit 8c outputs a predetermined signal to the camera 4 so that the film 4c is wound up by one frame to prepare for the next shooting.

On the other hand, it is not the human who approaches the safe,
For example, if it is a pet dog or cat, the image identification unit 1
When the image signal 0c compares the image signal stored in the memory 10a with the image signal newly supplied from the A / D converter 10d, the image of the dog or cat is smaller than the human, and therefore corresponds to those images. The total number of non-matching pixels does not exceed the reference value. Therefore, the image identifying unit 10c does not output the signal instructing the opening of the shutter. That is, even if a dog or cat approaches the safe, they are not recorded on the photographic film 4c, and the waste of the film is prevented.

In the present embodiment, the storage control unit 10b newly fetches the image signal for one frame from the A / D converter 10d at regular time intervals and stores it in the memory 10a. Since the image of the monitoring target such as does not change, the image signal for one frame is stored in the memory 10a only once when the system is activated, and thereafter, using this image signal, the image identification unit 10c uses the pixels described above. You may make it perform the comparison process of.

Further, in the above-mentioned embodiment, the human image is identified by comparing the pixels in the entire image of one frame.
The identification process may be performed only in one area of the frame image. For example, if the entire office is photographed with a camera, but the area to be monitored is only in the vicinity of the safe, limit the area for identification processing,
The processing time can be shortened.

Further, in the above embodiment, the image of the person is identified by the total number of the non-matching pixels, but the size of the image formed by the non-matching pixels (that is, the image of the human) is
It is also possible to identify whether or not the image is a person. For example, the number of pixels in the height of the image is checked, and on the other hand, the number of millimeters per pixel is calculated from the zoom magnification of the camera 4 and the like. It can be calculated. Therefore, for example, when the calculated height of the entity is larger than 1000 mm and smaller than 2200 mm,
The image may be determined to be a human image.

Further, in the above-described embodiment, the person identification processing is performed by capturing a new image signal for one frame every several seconds to several minutes, especially every 30 seconds, but these are merely examples, and The time interval may be variously set depending on the monitoring place, the monitoring target, and the like. In an ordinary image pickup device using a CCD, the CCD has a high sensitivity to infrared rays as well, so that a filter for blocking infrared rays is mounted in front of a lens of a camera or the like. Therefore, by removing this filter, it can be easily used as an infrared camera. Therefore, if the lighting fixture 6 is changed to an infrared lamp, it is possible to monitor at night without being noticed by a person.

Next, another example of the surveillance camera system according to the present invention will be described with reference to FIGS. FIG. 6 is a functional block diagram showing the main part of this surveillance camera system, and FIG. 7 is a schematic diagram showing the configuration of the camera optical system in this surveillance camera system. First, the configuration of the camera optical system will be described with reference to FIG. 7. The optical system of the camera 4 is similar to that shown in FIG.
Taking lens 4a having a zoom function, and taking lens 4a
And a half mirror 4b for splitting the light emitted from the taking lens 4a for splitting the light path.
A photographic film (silver salt film) 4c is arranged at a position where the subject image of the taking lens 4a that passes through the half mirror 4b is formed, and a shutter 4d is arranged in front of the film 4c. Further, a condenser lens 4e and a mirror 4f that redirects the light transmitted through the condenser lens 4e by 90 degrees are arranged on the reflection optical path of the half mirror 4b.
Further, on the reflection optical path of the mirror 4f, instead of the image pickup device of FIG. 3, a required light receiving area including a photodiode or the like (for example, 4.8 × 3 in the case of the re-imaging lens magnification M = 0.018). .6 mm) and a photometric sensor 4i
A re-imaging lens 4h for re-imaging the subject image of the photographing lens 4a on the photometric sensor 4i is arranged.

In FIG. 6, the camera controller 8 is
A shutter driving unit 8a that operates the shutter 4d by the release signal to expose the film 4c, and a winding system (not shown) for the film 4c are operated when the exposure of the film 4c is completed, and one frame of film is automatically operated. A winding control unit 8c for controlling the winding and a zoom control unit 8b for controlling the zoom magnification of the taking lens 4a in response to a command signal from the personal computer 14 shown in FIG. 1 are provided, and the light amount measured by the photometric sensor 4i is displayed. A / D conversion section 8d for converting into a digital amount, initial light amount measured by the photometric sensor 4i (first light amount), and measurement by the photometric sensor 4i after a predetermined time from the measurement point of the initial light amount. The calculation means 8e for calculating the change rate of the light quantity by dividing the light quantity difference from the calculated light quantity (second light quantity) by the first light quantity, and the calculation means 8e. The determination means 8f that determines whether the rate of change of the light amount is equal to or greater than a preset value set by the personal computer 14 shown in FIG. 1 and outputs a release signal to the shutter drive section 8a when the preset value is equal to or greater than the preset value, and the photometric sensor 4i. And a timer 8g for outputting a measurement command at regular time intervals. The calculating means 8e, the judging means 8f and the timer 8g constitute a signal processing means for generating a release signal.

Next, the operation of another embodiment configured as described above will be described with reference to the flowchart shown in FIG. When the power of the system is turned on, first, the personal computer 14 operates based on a predetermined program, outputs a predetermined signal, and causes the zoom controller 8b of the controller 8 to move the taking lens 4a (FIG. 3). Zoom and set the zoom ratio. On the other hand, when the power is turned on, power is supplied from the camera controller 8 to the lighting fixture 6, and the lighting fixture 6 is turned on to illuminate the vicinity of the safe in the office.

In this state, the subject image near the safe imaged by the camera 4 and by the taking lens 4a is
The light enters the re-imaging lens 4h via the half mirror 4b and the condenser lens 4e, and is re-imaged on the photometric sensor 4i by the re-imaging lens 4h. The photometric sensor 4i measures the total amount of light from the brightness of the imaged subject in the initial state (step S11), and the photocurrent (voltage) generated according to the amount of light is digitalized by the A / D converter 8d. And is stored in a memory (not shown) (step S12). Then, the timer 8g is operated (step S13), and it is determined whether or not a predetermined time (for example, 1 minute) set in advance has elapsed (step S14). When the predetermined time has elapsed, a measurement command is output from the timer 8g to the photometric sensor 4i to measure the amount of light by the imaging subject at the present time (step S15), and the measurement result is A /
After being converted into a digital amount by the D conversion unit 8d, it is taken into the arithmetic means 8e (step S16).

In the calculating means 8e, the formula | x2-x1 | / x
Based on 1, the light amount difference between the light amount x1 measured in the initial state and the light amount x2 measured after a lapse of a predetermined time is divided by the light amount x1 to calculate the change amount of the light amount (step S17). After that, the determining unit 8f determines whether the rate of change of the total light amount is a preset value, for example, 2% or more (step S
18). If the rate of change is 2% or less, the process returns to step S13. If it is determined that the rate of change is 2% or more, the determination unit 8f outputs a release signal to the shutter drive unit 8a to open the shutter 4d to expose the film 4c (step S19).

According to another embodiment as described above,
By forming an image of a subject on the photometric sensor 4i having a predetermined light receiving area, the total light amount is measured, and the change rate of the light amount is calculated from this light amount and the light amount in the initial state. The shutter is activated only when the film is exposed, so even if a dog or cat approaches the safe, they will not be recorded on photographic film.
In addition to preventing the film from being wasted, the image processing means as shown in the above embodiment is not required.

In the above-mentioned other embodiments, the case where the photometric sensor having a light receiving area of 4.8 × 3.6 mm is used as the photometric sensor 4i has been described, but the present invention is not limited to this. . For example, as shown in FIG.
The photometric sensor 4i 'is formed to have a size such that a person can be imaged by the re-imaging lens 4h. In this case, if the magnification of the re-imaging lens is M = 0.018, the size of the photometric sensor is 3.2 × 0.9 mm. Further, when a photometric sensor of such a size is used, it is preferable that the determination unit 8f outputs a release signal when the rate of change in the amount of light reaches 50% or more.

[0039]

As described above, the present invention provides a surveillance camera system including an optical system for forming an image of a subject on a photographic film and an image pickup device, and a shutter for exposing the photographic film. Storage means for storing an image signal output from the image sensor, storage control means for storing a first image signal output by the image sensor in the storage means, and a predetermined value based on the first image signal. Image identifying means for comparing the second image signal output from the image pickup device after a lapse of time with the first image signal stored in the storage means, and outputting a release signal when a predetermined comparison result is obtained; And a shutter driving means for exposing the film by opening the shutter when the image identifying means outputs the release signal.

Therefore, in the present invention, the image can be recorded on the photographic film only when the person moves and enters the photographing area of the television camera, that is, the monitoring area. Therefore, the person can be recorded extremely clearly, and since the image is taken only when the person is detected, the film is not wasted. Further, since no manpower is required, there is no labor cost, burden on the supervisor, and further no reliability problem.

Further, according to the present invention, by imaging the subject on the photometric sensor, the total amount of light is measured,
The rate of change of the amount of light is calculated from this amount of light and the amount of light in the initial state, and the shutter is activated only when the rate of change is equal to or greater than the set value to expose the film, so that even if a dog or cat approaches the safe. However, they are not recorded on the photographic film, and the waste of the film is prevented, and the image processing means becomes unnecessary.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an example of a surveillance camera system according to the present invention.

FIG. 2 is a configuration diagram showing an example of a surveillance camera system according to the present invention.

FIG. 3 is a schematic diagram showing a configuration of a camera optical system in the surveillance camera system of FIG.

FIG. 4 is a flowchart showing an operation procedure of the surveillance camera system in the example of the present invention.

FIG. 5 is a pixel configuration diagram for explaining an order of image signals output from an image pickup device included in the surveillance camera system according to the present invention.

FIG. 6 is a functional block diagram showing another example of the surveillance camera system according to the present invention.

FIG. 7 is a schematic diagram showing a configuration of a camera optical system in another example of the present invention.

FIG. 8 is a flowchart showing an operation procedure of a surveillance camera system in another example of the present invention.

FIG. 9 is an explanatory diagram showing another example of the photometric sensor according to the present invention.

[Explanation of symbols]

 2 surveillance camera system 4 camera 4a imaging lens 4b half mirror (optical path dividing means) 4c film 4d shutter 4e condenser lens 4f mirror 4g imaging device 4h re-imaging lens 4i, 4i 'photometric sensor 6 lighting fixture 8 camera controller 8a shutter drive unit 8b Zoom control section 8c Winding control section 8e Calculation means 8f Judgment means 8g Timer 10 Image processing apparatus 10a Memory 10b Storage control section 10c Image identification section 10d A / D converter 12 Television monitor 14 Personal computer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G03B 29/00 G03B 29/00 G08B 13/194 9419-2E G08B 13/194 13/196 9419-2E 13/196 H04N 5/225 H04N 5/225 C 7/18 7/18 E

Claims (14)

[Claims] 1. A surveillance camera system comprising an optical system for forming an image of an object on a photographic film, and a shutter for exposing the photographic film, wherein a light-receiving device for forming an object image obtained through the optical system. The element and the first signal output from the light receiving element and the second signal output from the light receiving element after a predetermined time from the output of the first signal are compared to obtain a predetermined comparison result. Surveillance camera system comprising: a signal processing unit that outputs a release signal when the shutter is released; and a shutter drive unit that opens the shutter to expose the film when the signal processing unit outputs the release signal. . 2. The light receiving element comprises an image pickup element,
The signal processing means releases a release signal based on a first video signal output from the image sensor and a second video signal output from the image sensor a predetermined time after the first video signal is output. 2. The surveillance camera system according to claim 1, wherein the surveillance camera system comprises image processing means for generating the. 3. The image processing means includes a storage means for storing an image signal output from the image sensor, and a storage control means for storing the first image signal output by the image sensor in the storage means. And a second image signal output from the image pickup device after a predetermined time from the first image signal and the first image signal stored in the storage unit are compared, and a predetermined comparison result is obtained. The surveillance camera system according to claim 3, further comprising image identifying means for outputting a release signal. 4. The image pickup device according to claim 2, wherein the image pickup device has a plurality of pixels arranged in a matrix, and outputs a signal corresponding to the brightness of light incident on each pixel as an image signal. Surveillance camera system. 5. The image identifying means compares the first image signal and the second image signal to identify a specific image not included in the first image signal but included in the second image signal. The surveillance camera system according to claim 2, 3 or 4, which outputs the predetermined signal when detected. 6. The image identifying means compares the first image signal and the second image signal for each corresponding pixel, and the total number of pixels in which the sizes of the two image signals do not match is used as a reference. The surveillance camera system according to claim 5, wherein the presence or absence of the specific image is determined by comparing with a value. 7. The surveillance camera system according to claim 2, wherein the storage unit stores the image signal output from the image sensor as the first image signal at predetermined time intervals. 8. The surveillance camera system according to claim 5, wherein the specific image has a dimension of a subject represented by the image larger than 1000 mm and smaller than 2200 mm. 9. The optical system comprises a taking lens and an optical path splitting means for splitting light emitted from the taking lens into a first optical path leading to the photographic film and a second optical path leading to the image sensor. The surveillance camera system according to claim 1. 10. The monitoring system according to claim 9, wherein the optical system further includes a re-imaging lens for re-imaging a subject image formed by the taking lens on the image sensor, in the second optical path. Camera system. 11. The light receiving element comprises a photometric sensor for measuring the amount of light in an image pickup area formed by the optical system, and the signal processing means includes a first amount of light measured by the photometric sensor and A calculating unit that calculates the rate of change of the light amount by dividing the light amount difference from the second light amount measured by the photometric sensor after a predetermined time from the measurement of the first light amount by the first light amount; 2. The surveillance camera system according to claim 1, further comprising: a determination unit that determines whether the rate of change of the light amount is equal to or more than a preset value and outputs a release signal when the rate of change is equal to or greater than the preset value. 12. The surveillance camera system according to claim 11, wherein the photometric sensor has a light receiving area corresponding to a size of a subject to be monitored which is imaged by the optical system. 13. The optical system comprises a taking lens and an optical path splitting means for splitting light emitted from the taking lens into a first optical path leading to the photographic film and a second optical path leading to the photometric sensor. The surveillance camera system according to claim 11 or 12. 14. The optical system further comprises a re-imaging lens for re-imaging a subject image formed by the taking lens on the photometric sensor in the second optical path. Surveillance camera system.