JPH02151996A - Room entry control system - Google Patents

Abstract

PURPOSE:To prevent the generation of illegal invation by comparing an area value obtained from an image picked up by a monitoring camera through an image processing means with a previously determined reference value, and generating an alarm when the area value is more than the reference value. CONSTITUTION:When a registered person M1 stands in front of a door (a), infrared-ray interruptor 11 detects the person and generates a trigger signal and the signal is inputted to a rapid image processor 13. Then, the processor 13 inputs an image from the monitoring camera 12, finds out a difference between the inputted image and a previously stored reference image, calculates an area, and sends the calculated area to a controlling computer 15. The computer 15 identifies the registered person from code information inputted from a code input device 16 and sets up an area reference value based upon personal number information. If a person M2 having no entrance permission stands on the back of the person M1, and area calculation value from the processor 13 exceeds the reference value as a matter of course, so that the computer 15 detects the existence of an illegal invader M2 and an alarm generator 17 generates an alarm to prevent a door from being unlocked. Thus, illegal invasion can be previously suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an entry control system for preventing entry of persons other than those who have been registered in advance.

(Prior art) Recently, it has become possible to identify whether a person is a registrant or a person who has received permission (hereinafter referred to as a registrant) using an ID card, key number, fingerprint, handprint, voice, etc. unlock,
Entrance control systems that keep the room locked unless you are a registered user are becoming popular. However, conventional room entry control systems do not manage how many people entered the room each time.
For example, if a registrant enters the room immediately after it is unlocked, unauthorized intrusion is possible, so the reliability is extremely low.

(Problems to be Solved by the Invention) As described above, in the conventional room entry control system, it is not possible to know the number of people entering the room, so it is easy to gain unauthorized entry by following the registrant.

This invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an entry management system that can detect an attempt to enter a room following a registrant and generate an alarm, for example.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, an entry control system according to the present invention includes a detection means for detecting that an object approaches the vicinity of an entrance/exit door; 2. After capturing an image captured by the surveillance camera that captures an image of the surrounding area and when the detection means detects an object, and calculating the difference between this image and a standard image registered in advance, 2. It is equipped with an image processing means that converts the area into a value and calculates its area, and a control means that compares the area value obtained by this means with a predetermined standard value and generates an alarm when the area value is equal to or greater than the standard value. It is composed of

(Function) In the entrance examination management system with the above configuration, when it is detected that an object has approached the vicinity of the entrance/exit door, the image of the area around the door captured by the surveillance camera is captured into the image processing means, and the image is registered in advance. After the difference with the standard image that has been set is taken, it is binarized and its area is calculated. If the object is a registered person, the area value matches the predetermined standard value, so the door is unlocked without issuing an alarm. However, when the object includes a person other than the registrant, the area value becomes the standard value, so the door remains locked and an alarm is generated.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows its configuration, where 11 is an infrared interrupter and 12 is a surveillance camera. These are shown in Figure 2 (a
) (side view) and (b) (top view), it is installed on the outdoor side near the entrance/exit door a. That is, the light source 111 and the light receiver 112 of the infrared interrupter 11 are respectively attached to both walls bl and b2 of the door a, and when a person stands in front of the door a, the light receiver 112 detects the infrared ray interruption from the light source 111 and is triggered. It is designed to output a signal. Further, the surveillance camera 12 is mounted on the ceiling C so as to take an image of the area in front of the door a, and its field of view is set to take an image of at least 2 Å or more. Note that d is the floor.

Further, in FIG. 1, 13 is a high-speed image processing device. This high-speed image processing device 13 includes an infrared ink printer 11
It is driven for a certain period of time after receiving the trigger signal output from the camera, captures the image from the surveillance camera 12, and compares it with the standard image before the infrared rays are cut off (in a state where no person is standing in front of door a). After determining , the number of people in front of door a is identified by removing noise, binarizing, and calculating the area. Images captured by this high-speed image processing device 13 can be displayed on a monitor television 14 as appropriate.

The high-speed image processing device 13 is controlled by a system control computer 15 and outputs a calculated area value to the system control computer 5. This system control computer 15 controls the high-speed image processing device 13 and also manages the code input device 16 of the registrant.

The code input device 16 has a function of inputting the number of people entering the room, and the computer 5 identifies the registrants by inputting the code.
A reference value is set according to the input number of people, and when the area calculation value from the high-speed image processing device 13 is equal to or greater than the reference value, the alarm generating device 1γ is driven to generate an alarm.

FIG. 3 shows a specific configuration of the high-speed image processing device 13. This device 13 is an image input board 131
, a processor board I32, a memory board 133, and an image output board 134. Each board 131 to 134 is connected to the control computer 5 via a control bus 135, a control interface 13B, and a terminal 137, and the image input board 131 is connected to the control computer 5 via a terminal 137. The image output board 134 is connected to the monitoring camera 12 via a terminal 138 and to the infrared infrared ink converter 11 via a terminal 139, and the image output board 134 is connected to the monitor television 14 via a terminal 131o.

Each board 131 to 134 also has a high-speed data bus 131.
1 allows mutual human output of data.

In other words, when the image input board 131 receives a trigger signal from the infrared ink cleaner 11, the image input board 131
A part of the data obtained here is stored in the memory board 133. This memory board 133 stores in advance image data in a state where no one is present (hereinafter referred to as standard image data).

The processor board 132 is, for example, D as shown in FIG.
SP (digital signal processor) A1 memory 81
- B3, reads standard image data and current image data from the memory board 133, takes them into memories B1 and B2, respectively, and performs difference between them, noise removal, binarization, and area calculation using DSPA. The area calculation value is stored in the memory B3 and sent to the control computer 15 via the control bus 135, control interface 136, and terminal 137. In addition, the image output board 134 receives a display command from the control computer 15, reads image data stored in the memory board 133, converts it into a television signal, and sends it to the terminal 1310.
The image is transmitted and displayed on the monitor television 14 via the .

The operation of the configuration described in item 1 will be explained below.

Assume now that, as shown in FIG. 2, a registrant M1 stands in front of door a, and a person M2 who has not received permission to enter the room stands immediately behind him. First, when the registrant Ml stands in front of the door a, the infrared ink cleaner 11 detects this and generates a trigger signal, which is input to the high-speed image processing device 13. Upon receiving this trigger signal, the high-speed image processing device 13 captures the image from the surveillance camera 12, calculates the difference from the standard image stored in advance, removes noise, binarizes it, and then calculates the area. It is sent to the control computer 15. The control computer 15 identifies the registrant from the code information from the code input device 16, and at the same time sets the area standard value based on the number of people information.

Here, if there is a person M2 who has not received permission to enter the room after the registrant M1, the registrant M1 will naturally enter the number of people entering the room as one person, so the control computer 15 will set the area reference value to one person. However, since the area calculation value from the high-speed image processing device 13 is two-dimensional, it naturally exceeds the standard value.

At this time, the control computer 5 detects the presence of the illegal intruder M2, generates an alarm using the alarm generator 17, and does not unlock the door a. At this time, if the image from the monitoring camera 12 is displayed on the monitor television 14, it can be visually identified.

On the other hand, if the person M2 behind the registrant M1 has received permission to enter the room, the registrant M1 inputs the number of people as two. At this time, the control computer 5 sets the area standard value to two, so the calculated area value will not exceed the standard value.
This allows the lock to be released without generating an alarm.

Therefore, the entry control system configured as described above can identify and issue an alarm even if a trespasser attempts to enter the room following the registrant, thereby preventing trespassing. can.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide an entry management system that can detect an attempt to enter a room following a registrant and generate, for example, an alarm.

[Brief explanation of the drawing]

Fig. 1 is a block circuit diagram showing an embodiment of the entry control system according to the present invention, Fig. 2 is a diagram for explaining the installation location of the infrared infrared ink bar and surveillance camera of the same embodiment, and Fig. 3 is the same. FIG. 4 is a block circuit diagram showing the configuration of a high-speed image processing apparatus according to an embodiment. FIG. 4 is a block circuit diagram showing the configuration of a processor board of the high-speed image processing apparatus. DESCRIPTION OF SYMBOLS 11... Infrared interrupter, 12... Surveillance camera, 13... High-speed image processing device, 131... Image controller, 132... Processor board, 133...
Memory board, 134... Image output board, 135...
- Control bus, 136... Control interface, 1
311...high-speed pig bus, 14...monitor television,
15... System control computer, 16... Code input device, 17... Alarm generating device, A...
DSP, Bl~B3...Memory. Applicant's representative Patent attorney Takehiko Suzue

Claims (1)

[Claims] a detection means for detecting that an object has approached the vicinity of an entrance/exit door; a surveillance camera for capturing an image of the vicinity of the door; and when the detection means detects an object, captures an image captured by the surveillance camera; An image processing means that calculates the area by calculating the difference between this image and a standard image registered in advance and then binarizes the difference, and an area value obtained by this means and a predetermined standard value. An entry control system comprising a control means for generating an alarm when the area value is equal to or greater than a standard value.