JP3955781B2 - Intercom device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intercom apparatus that has an imaging unit and displays a visitor on a living room terminal, and more particularly to an intercom apparatus that senses a visitor and automatically captures an image.
[0002]
[Prior art]
An intercom apparatus having a video imaging unit and automatically capturing images when a visitor is present has a configuration shown in FIG. In FIG. 4, 21 is an entrance machine, 31 is a room terminal, and the door machine 21 is provided with a call calling unit 22, a near-infrared image photographing unit 23, and a human body sensor 24. A call unit 32 and a video display unit 33 are provided.
When there is a visitor, in the entrance machine 21, the human body detection sensor 24 detects the visitor, the video shooting unit 23 starts shooting the visitor, and automatically displays it on the video display unit 33 of the living room terminal 31. It is configured as follows. Some intercom devices having a recording function start recording when a human body sensor detects a visitor or a suspicious person.
The human body sensor 24 is composed of an infrared sensor or a temperature sensor, and is often provided outside the entrance machine.
[0003]
[Problems to be solved by the invention]
The above conventional intercom apparatus uses a human body sensor 24 to automatically detect a visitor or a suspicious person and activate the intercom apparatus, which increases the cost. In addition, the human body sensor 24 has a fixed sensing distance of 80 cm, for example, so that it works well for entrances with specific conditions, but it cannot conveniently detect visitors and cannot be installed. There were many entrances to the conditions.
Therefore, in view of the above problems, the present invention provides an interphone device that performs a predetermined operation by detecting a visitor at any entrance without using a human body sensor or selecting an installation condition. The purpose is to provide.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the invention of claim 1 is directed to an entrance machine having a call communication unit in which a visitor calls and calls a resident, a lens for imaging the visitor, and a video imaging unit including a CCD, A video display unit that displays a video from the video imaging unit operated by a call operation from a visitor, and a resident who has confirmed the ringing sound that is generated by a visitor's call operation and the video displayed on the video display unit. An intercom device comprising a living room terminal having a communication unit that responds and talks to a visitor, and emits light at a predetermined interval as a light source for distance measurement at a position away from a CCD at a front door. An infrared LED is provided, and the living room terminal emits the infrared LED by calculating the difference between the captured image when the previous infrared LED is not emitting and the captured image when the infrared LED emits light In addition, the position of the reflected light reflected by the reflected object and passing through the lens and reaching the CCD is specified, and the distance between the reflected light position and the center of the CCD element is measured, and the reflected object and the entrance are measured. An image processing unit for calculating the distance of the machine, a determination unit for determining that there is a visitor when the distance calculated by comparing the calculated distance with a preset reference distance is within the range of the reference distance, the provided Rutotomoni, if the determination unit determines that there visitors, control for recording an image captured by or image pickup unit for displaying an image from the image pickup unit to the image display unit by operating the image pickup unit It has the part .
[0005]
By configuring in this way, changes in the reflected object in front of the entrance aircraft are detected and the distance to the reflected object is calculated to determine the presence or absence of visitors. It can also be used at the entrance, and can detect visitors without using human body sensors.
[0006]
The invention of claim 2 is characterized in that, in the invention of claim 1, the living room terminal has a setting unit for setting a reference distance for comparison with the distance calculated by the image processing unit. By providing, it is possible to optimally set the condition for judging that there is a visitor according to the installation status of the entrance machine, so that it is possible to prevent a passerby from malfunctioning.
[0007]
The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the infrared LED is also illumination for displaying an image on the image display unit, and by this configuration, separate illumination is provided. In addition, visitors can be confirmed on the video display even at night.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an example of an intercom apparatus according to the present invention, wherein 1 is an entrance machine and 11 is a living room terminal. The front door 1 has a calling / calling unit 2 for calling / calling to the living room terminal 11 and a video image pickup unit 3 having a lens 3a and a CCD 3b to capture a visitor and to transmit a video to the living room terminal during the call. And an infrared LED 4 that emits light in the infrared region.
[0009]
In addition, the living room terminal 11 includes a call unit 12 that makes a call with the entrance machine 1, a video display unit 13 that displays a video signal sent from the entrance machine 1, and video data sent from the entrance machine 1. The control unit 16 includes an image processing unit 14 that performs image processing on the image and a determination unit 15 that compares the calculated distance with a preset reference distance to determine whether there is a visitor. The living room terminal 11 is connected to the signal line 6.
In this embodiment, the CPU for communication control included in the control unit 16 serves as the image processing unit 14 and the determination unit 15. Further, the CCD 3b having no infrared light cut filter is used so that an image can be displayed with infrared light.
[0010]
Hereinafter, the visitor sensing operation will be described. The infrared LED 4 is turned on at a constant cycle, for example, at an interval of 60 msec, and the video imaging unit 3 captures images at an interval of 30 msec in synchronization with the light emission cycle of the infrared LED 4 and transmits the image data to the room terminal 11. The image processing unit 14 alternately receives the image data when the infrared LED 4 is turned on and the image data when the infrared LED 4 is turned off, and always stores the image of the immediately preceding one frame.
Then, the latest image data in which the infrared LED 4 that has been sent is turned on is compared with the image data in which the immediately preceding infrared LED 4 is turned off. This calculation calculates the difference between the image when the immediately preceding infrared LED 4 is off and the image when the infrared LED 4 is on and detects the position of the infrared reflected light on the CCD 3b by calculating the center of gravity of the image. Based on the position of the infrared reflected light and a preset reference distance, the determination unit 15 determines whether or not there is a visitor.
[0011]
FIG. 2 shows a principle diagram for calculating the distance to the visitor, and shows the relationship between the lens 3 a, the CCD 3 b, the infrared LED 4 and the visitor 7. The distance between the infrared LED 4 and the center of the lens 3a is the base line length B, the focal length is f, and the difference between the position of the infrared reflected light calculated by the image processing unit 14 and the center of the CCD is x. If the distance to the person) is L, from the principle of triangulation,
L = B × f ÷ X
The determination unit 15 determines that there is a reflector, that is, that there is a visitor if the calculated distance is within the preset reference distance range, and if it is out of the range, Judge that there are no visitors.
When it is determined that there is a visitor, the control unit 16 performs video recording or video display on the video display unit 13, and when it is determined that there is no visitor, the standby state is continued.
[0012]
In this way, the change in the reflected object in front of the entrance machine is detected and the distance to the reflected object is calculated to determine the presence or absence of visitors. In addition, since the infrared LED and the image capturing unit sense the visitor, the visitor can be sensed without using an expensive human body sensor, and the interphone device can be constructed at a low cost.
Further, since the CCD described above is imaged with infrared light, it is not necessary to provide a normally mounted infrared cut filter. Therefore, it is possible to display an image with infrared light, and it is possible to use the infrared LED as night illumination, and it is not necessary to separately provide night illumination, and the configuration can be simplified.
[0013]
FIG. 3 is a block diagram showing another example of the intercom apparatus of the present invention, and the configuration of the room terminal is different from that of the above embodiment. The living room terminal 11 a is provided with a setting unit 17 for setting a reference distance in addition to the call unit 12, the video display unit 13, and the control unit 16. The setting unit 17 may be configured with a numeric keypad. However, for example, by selecting about 10 types of distances that are pre-programmed and formed by a push button, the setting unit 17 can be set by a simple operation, and the configuration is simple. In addition, the same code | symbol is attached | subjected to the component same as the said FIG.
In this way, by providing the setting unit, it is possible to optimally set the condition for determining that there is a visitor according to the installation status of the entrance machine, so that it is possible to prevent malfunctions by passers-by.
[0014]
In the above embodiment, the determination unit is realized by the CPU provided in the control unit together with the image processing unit. However, the determination unit may be provided independently of the image processing unit, and may be an analog circuit using a comparator or the like. It can also be implemented. Moreover, although the light emission interval of the infrared LED is 60 msec, the light emission interval need not be limited to this, and may be long or short. However, it is preferable that the light emission period is shorter because a response to the visitor can be made faster.
[0015]
【The invention's effect】
As described above in detail, according to the invention of claim 1, since the change of the reflected object in front of the entrance machine is detected and the distance to the reflected object is calculated to determine the presence or absence of the visitor, the installation condition It is possible to respond to the entrance of any environment regardless of whether or not a visitor can be detected without using a human body sensor.
[0016]
In addition to the effect of claim 1, the invention of claim 2 can optimally set a condition for judging that there is a visitor according to the installation status of the entrance machine, so that it is possible to prevent malfunctions by passers-by. it can.
Further, according to the invention of claim 3, in addition to the effect of claim 1 or 2, it is not necessary to separately provide night illumination, and the configuration can be simplified.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an example of an embodiment of an intercom apparatus according to the present invention.
FIG. 2 is a diagram illustrating the principle for calculating a distance to a visitor in FIG.
FIG. 3 is a block diagram showing another example of an intercom apparatus according to the present invention.
FIG. 4 is a block diagram of a conventional intercom device.
[Explanation of symbols]
1 .. Entrance machine 2.. Calling communication unit 3.. Video imaging unit 3 a · Lens 3 b · · CCD 4 · · Infrared LED 11, 11a · · Room terminal, 12 · · Calling unit, 13. Image display unit, 14 Image processing unit, 15 Judgment unit, 17 Setting unit

Claims (3)

An entrance machine having a call calling unit where a visitor calls and calls a resident, and a video imaging unit comprising a lens and a CCD for imaging the visitor, and the video imaging where the resident is operated by a call operation from the visitor A video display unit for displaying video from the unit, and a call unit for calling the visitor in response to a call sound generated by a call operation of the visitor and a resident who has confirmed the video displayed on the video display unit An intercom device comprising a living room terminal having
The entrance machine is provided with an infrared LED that emits light at a predetermined interval as a light source for distance measurement at a certain distance from the CCD, and the room terminal is not emitting the previous infrared LED. When the infrared LED is lit by calculating the difference between the captured image of the captured image and the captured image when the infrared LED emits light, the reflected light that is reflected by the reflected object and passes through the lens and reaches the CCD An image processing unit for calculating the distance between the reflected object and the entrance machine by specifying the position of light and measuring the distance between the position of the reflected light and the center of the CCD element, and a preset reference distance and and a determination unit for determining that the visitor is present when the distance described above computed by comparing the distances the operation is within the range of the reference distance Rutotomoni, the determining section above come 'S there when it is determined that, said having a control unit for recording the images picked up by or the image pickup unit for displaying an image from the image pickup unit to the image display unit by operating the image pickup unit Interphone device characterized by. The intercom apparatus according to claim 1, wherein the living room terminal includes a setting unit that sets a reference distance for comparison with the distance calculated by the image processing unit. The intercom apparatus according to claim 1 or 2, wherein the infrared LED is also illumination for displaying an image on the image display unit.

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