JP2007194863A - Monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitoring system capable of displaying an image without sense of incongruity, and capable of immediately confirming a present condition. <P>SOLUTION: The monitoring system comprises a camera apparatus A and a monitor apparatus B1. The camera apparatus A comprises an image processing type human body detector 1, a heat ray type human body detector 2, an image storing unit 12b for storing image data groups acquired by an imaging unit 10 into a storing unit 11 after compressing relating to a time axis, and an image transmitting unit 12a for transmitting past image data consist of image data groups having image data whose imaged time is before the detected time among the image data groups stored by the image storing unit 12b to the monitor apparatus B1 in the order of its imaged time when presence of a human is detected, and for transmitting real time image data to the monitor apparatus B1 after transmission of the past image data is terminated. The monitor apparatus B1 comprises an image display unit 6, an image recording unit 7 for sequentially recording the image based on the transmitted image data into a storing unit 7a, and a reproducing unit 8 for displaying the image recorded in the storing unit 7a on an image displaying unit 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a monitoring system.

Conventionally, a door phone system having a function as a monitoring system has been provided. Such a doorphone system projects a doorphone main unit installed indoors, a doorphone slave installed outdoors to make calls between indoors and outdoors, and the presence of intruders and visitors into the detection area as images. The doorphone master unit has a monitor device for displaying an image of the camera device, and when a person enters the detection area In addition to notifying the user of the intrusion of the person, the image of the camera device is recorded (for example, Patent Document 1).
Japanese Patent Laid-Open No. 2003-32523 (FIGS. 2 and 3)

  However, in the above prior art, since the past image signal is transmitted from the sensor-equipped camera device to the doorphone master unit first and the real-time image signal is transmitted after that, the monitor device of the doorphone master unit uses a real-time image. The past image is also displayed first. For this reason, even if an intruder or the like is detected and an attempt is made to confirm the current situation, there is a problem that the current situation cannot be immediately confirmed because the past image is displayed first.

  On the other hand, in order to immediately check the current situation, there has been proposed a technique in which a real-time image signal is transmitted first, a past image signal is transmitted, and a real-time image is displayed before a past image.

  In this case, since the real-time image is displayed before the past image, the current situation can be confirmed immediately, but since the past image is displayed after the real-time image, there is an uncomfortable image. There was a new problem of being displayed.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a monitoring system capable of displaying an image without a sense of incongruity and immediately confirming the current situation.

  In order to solve the above problems, the invention of the monitoring system according to claim 1 includes a camera device and a monitor device for monitoring an image obtained by the camera device, and the camera device is a person within a predetermined area. A human body detecting means for detecting the presence of the image, an imaging means for imaging the predetermined area, an image storage means for compressing and storing a group of image data obtained by the imaging means, and the human body detecting means When the presence of a person is detected, the monitor device stores past image data consisting of image data groups having image data whose imaging time is earlier than the detection time among the image data groups stored by the image storage means in the order of the imaging times. And transmitting means for transmitting real-time image data being imaged by the imaging means to the monitor device when the transmission of the past image data is completed. And image display means, a recording means for recording an image based on image data transmitted from the camera device sequentially, characterized in that it comprises a reproducing means for displaying an image recording means has recorded the image display means.

  According to the invention of the monitoring system of claim 2, in addition to the configuration of claim 1, the door phone parent for the door phone system that allows the camera device to be installed outdoors and the monitor device to be installed indoors to make a call between indoors and outdoors. It is provided in the machine.

  According to a third aspect of the invention of the monitoring system, in addition to the configuration of the first or second aspect, the past image data is picked up from image data whose image pickup time is earlier than the detection time in the image data group stored by the image storage means. It is characterized in that it consists of image data groups up to image data whose time is substantially the same as the current time.

  According to the invention of the monitoring system of claim 4, in addition to the configuration of any one of claims 1 to 3, a selection means for selecting whether or not to transmit past image data from the camera device to the monitor device is provided. It is characterized by that.

  According to the first aspect of the monitoring system of the present invention, when the human body detection means detects the presence of a person, the past image data compressed with respect to the time axis is transmitted to the monitor device in the order of the imaging time, and then the imaging means The real-time image data being picked up is transmitted to the monitor device, and the monitor device sequentially records images based on the image data transmitted from the camera device and displays them on the image display means, so that they are displayed on the image display means of the monitor device. As a result, the time series of the images to be displayed does not move back and forth, and an image can be displayed without a sense of incongruity. Further, when transmitting image data from the camera device to the monitor device, since the real-time image data is transmitted after the transmission of the past image data is completed, the past image data and the real-time image data are transmitted in parallel. The number of transmission lines can be reduced compared to the case where the cost is reduced, both in terms of hardware such as circuit configuration for transmission and software such as a program for transmission processing. There is an effect that can be achieved. In addition, since the past image is compressed with respect to the time axis, the past image is displayed as compared with the case where the real time image is displayed after displaying the past image not compressed with respect to the time axis as in the past. The time from the start of display to the start of display of the real-time image can be shortened, thereby producing an effect that the current situation can be immediately confirmed.

  The invention of the monitoring system according to claim 2 is advantageous in that it can provide a door phone system that can also be used as a monitoring system.

  The invention of the monitoring system of claim 3 is that the time of the last image displayed last and the time of the first real-time image displayed are substantially the same time, thereby the time of the last image displayed last, The time difference from the time of the first real-time image to be displayed is not increased, and there is an effect that it is possible to display an image without a sense of incongruity.

  The invention of the monitoring system according to claim 4 has an effect that it is possible to select whether or not to display the past image on the image display unit.

  Below, one Embodiment of the monitoring system of this invention is described with reference to FIGS.

  The monitoring system of the present invention is incorporated in, for example, a door phone system for making a call between a house and an outside. This door phone system includes a camera device A and a camera device A installed in a garden as shown in FIG. And a doorphone master unit B installed indoors in the house H and a doorphone slave unit C installed outside the house H. In addition, since the doorphone subunit | mobile_unit C can use a conventionally well-known thing, in this embodiment, description about the doorphone subunit | mobile_unit C is abbreviate | omitted, and demonstrates the camera apparatus A and the doorphone main unit B. FIG.

  First, the camera device A will be described. The camera device A is, for example, a camera device with a sensor. As shown in FIG. 1, the image processing type human body detector 1 and a hot-wire human body detector (PIR) are used as human body detecting means for detecting the presence of a person in a predetermined area. ) 2 and a notification unit 3.

  Here, the image processing type human body detector 1 includes an imaging unit 10, an FPGA 11, a storage unit 12, a YUV / NTSC conversion unit 13, an image processing unit 14, a contour image storage unit 15, and a signal processing unit 16. And a communication unit 17 for performing human body detection by performing image processing on the captured image and transmitting the image captured by the image capturing unit 10 to the intercom base unit B.

  The imaging unit 10 converts an image output from the image sensor (not shown) that continuously captures the predetermined area in time series into digital data, and converts the image data into grayscale image data (hereinafter simply referred to as “image data”). And an A / D converter that outputs the YUV signal. In this embodiment, a 15 FPS (Frames Per Seconds) type is used. Further, as the image sensor, a solid-state image sensor such as a CCD, a CMOS image sensor, or the like is used. If the device itself outputs a digital signal like a general CMOS camera, the A / D converter may not be provided.

  The storage unit 11 is a storage device such as a RAM, and is used to accumulate images captured by the image capturing unit 10.

  An FPGA (Field Programmable Gate Array) 12 is obtained by the imaging unit 10 and the image transmission unit 12 a that outputs the image data (YUV signal) from the imaging unit 10 to the image processing unit 14 or the YUV / NTSC conversion unit 13. An image storage unit 12b that compresses the time-series image data group with respect to the time axis and stores the compressed image data in the storage unit 11 is realized by software.

  Here, the image transmission unit 12a has a past image transmission function and a real-time image transmission function. When the past image transmission function receives a transmission start signal, which will be described later, from the signal processing unit 16, the imaging time is detected from the image data group stored in the storage unit 11 by the image storage unit 12b (the presence of a person is detected). The past image data consisting of a group of image data from image data before t1 (see FIGS. 3A to 3C) to image data whose imaging time is substantially the same as the current time is acquired, and the imaging time is acquired. This is a function of transmitting to the YUV / NTSC conversion unit 13 in order (in order of imaging time).

  In the present embodiment, as shown in FIGS. 3A to 3C, the past image transmission function has an imaging time of the image data group (image data P3, P6, P9...) Stored in the storage unit 11. From the image data P3 which is substantially the same time as the time t0 one second before the detection time t1 (more specifically, the time closest to the time t0 and after the time t0), the imaging time is substantially the same as the current time t2 (further In other words, an image data group composed of seven image data (image data P3, P6, P9, P12, P15, P18, P21) up to image data P21 that is closest to time t2 and before time t2 is represented by: The past image data is transmitted to the YUV / NTSC converter 13.

  On the other hand, the real-time image transmission function is a function for transmitting the real-time image data P23 being captured by the imaging unit 10 to the YUV / NTSC conversion unit 13 after the transmission of the past image data by the past image transmission function is completed. The real-time image transmission function stops operating when a transmission end signal (to be described later) is received from the signal processing unit 16.

  Further, the image storage unit 12b compresses the 15 FPS image data group (see FIG. 3A) obtained by the imaging unit 10 with respect to the time axis, and stores the 5 FPS image data group (see FIG. 3B). As shown in FIG.

  The YUV / NTSC conversion unit 13 converts image data composed of YUV signals output from the imaging unit 10 via the FPGA 12 into image data composed of NTSC (National TV Standards Committee) signals.

  The image processing unit 14 is for detecting a person in a predetermined area based on the image information obtained by the imaging unit 10, and includes an outline extraction unit 14a, a moving outline extraction unit 14b, and a moving area detection. 14c and a region feature amount detection unit 14d.

  The contour extraction unit 14a performs differential processing on the grayscale image data obtained from the imaging unit 10 via the FPGA 11 using a generally known SOBEL filter or the like to extract edges (contours), and each image is extracted. Are stored in the contour image storage unit 15 for a certain period of time.

  The moving contour extraction unit 14b performs logical synthesis using the time-series edge images stored in the contour image storage unit 15 and creates a synthesized image in which only the edges of the moving object are extracted.

  The moving region detection unit 14c is for labeling the composite image created by the moving contour extraction unit 14b and detecting a region corresponding to a moving object (hereinafter referred to as “moving region”). In addition, if the moving area is represented by a moving frame such as a rectangle circumscribing the outline of the moving body, the amount of data is reduced and the calculation is facilitated. Only the edges of the selected area can be extracted.

  Based on the edge image stored in the contour image storage unit 15 and the moving region of the moving object detected by the moving region detection unit 14c, the region feature amount detection unit 14d determines the direction value of the moving edge portion in the moving region. Extract and create the edge direction value distribution, and use this edge direction value distribution as the feature value in the edge direction of the moving region. Based on the feature value in the edge direction, determine whether the region movement is due to disturbance or human. If it is determined that the region is moved by a person, a human body detection signal is output to the signal processing unit 16.

  Here, the edge of the human body has more curved parts than the straight part and has a complicated shape, so the edge direction is distributed in all directions, while the edge of the shadow of the structure has many linear components. The edge distribution tends to be a biased distribution. In addition, in order to determine whether or not a certain moving area represents a human body, it is also possible to store the edge direction value distribution in a table and compare the distribution with the edge direction value distribution table based on the movement of the human body. .

  The contour image storage unit 15 is, for example, a storage device such as a RAM, and is used to store the edge image extracted by the contour extraction unit 14a for a certain period.

  The signal processing unit 16 is composed of a CPU or the like, and realizes a function for controlling the operation of each unit of the image processing human body detector 1 by software or the like. The signal processing unit 16 includes a hot-wire human body. The detection part 2 and the alerting | reporting part 3 are connected. The signal processing unit 16 receives the human body detection signal from the image processing unit 14 or the human body detection signal (described later) from the hot-wire human body detection unit 2 (that is, when the presence of a person is detected). The transmission start signal is output to the notification unit 3 and the notification start signal is output to the notification unit 3.

  In addition, the signal processing unit 16 outputs the above-described transmission end signal to the FPGA 12 after a predetermined time has elapsed after receiving the human body detection signal (in this embodiment, after 30 seconds have elapsed from the detection time t1). It is configured. Further, the signal processing unit 16 outputs a notification end signal to the notification unit 3 after a predetermined time has elapsed after receiving the human body detection signal (in this embodiment, after 3 seconds have elapsed from the detection time t1). It is configured.

  Note that the timing of outputting the transmission end signal and the notification end signal is not limited to the above example. For example, the transmission end signal is output to the FPGA 12 after 1 minute and a second from the detection time t1, and the notification end signal is output. It may be configured to output to the notification unit 3 after 5 seconds have elapsed from the detection time t1, that is, the timing for outputting the transmission end signal and the notification end signal may be appropriately changed according to the situation. Of course, the transmission end signal and the notification end signal may be output at the same timing. Alternatively, the timing for outputting the transmission end signal and the notification end signal may be set freely by the user.

  The transmission unit 17 modulates the NTSC signal output from the YUV / NTSC conversion unit 13 into a signal for transmission and outputs the signal to the doorphone base unit B. The transmission unit 17 and the reception unit 4 of the doorphone base unit B described later are used for transmission. The connection line L is used. The transmission timing of the image data from the transmission unit 17 to the monitor device B1 is synchronized with the imaging timing (15 FPS) of the imaging unit 10.

  The heat ray type human body detector 2 detects a human body in the detection region by a method different from that of the image processing type human body detector 1 and does not cause a decrease in sensitivity even at night, and collects heat rays from the detection region. Comparing the lens 2a constituting the optical system that emits light, the pyroelectric element 2b that converts the change of the condensed heat ray into an electrical signal, the amplification circuit 2c that amplifies the electrical signal, and the level of the amplified signal compared with a threshold value And a comparator 2d that detects the stay of a person in the detection region, and outputs a human body detection signal to the signal processing unit 16 when the human body is detected by heat rays emitted from the human body.

  The notification unit 3 is for intimidating notification to an intruder, and includes a light 3a used for visual threats and an electroacoustic transducer (buzzer or speaker) used for auditory threats. The light 3a is turned on and the sound is output from the electroacoustic transducer from when the notification start signal is received from the signal processing unit 16 until the notification end signal is received.

The camera apparatus A is configured as described above. Next, the doorphone master unit B will be described. As shown in FIG. 1, the doorphone master unit B includes a monitor device B1 that displays an image based on the image data transmitted from the camera device A, and a phone call for making a call with the doorphone slave unit C. The monitor device B1 provided with the device B2 is a memory comprising the aforementioned receiving unit 4, signal processing unit 5, image display unit 6 such as a liquid crystal display (LCD), recording unit 7, and a storage device such as a RAM. A unit 7a and a playback unit 8 are provided. The receiving unit 4 is for receiving the image data transmitted from the transmitting unit 17, and is connected to the transmitting unit 17 of the camera device A by a connection line L. The transmission path between the reception unit 4 and the transmission unit 17 is not limited to a wired type using the connection line L, and may be a wireless type such as infrared communication.

  The signal processing unit 5 includes, for example, a CPU or the like, and realizes a function of demodulating the image data received by the receiving unit 4 and sequentially displaying the data on the image display unit 6 by software or the like. The recording unit 7 sequentially records images based on the image data transmitted from the camera device A in the storage unit 7a. The reproduction unit 8 displays the image recorded in the storage unit 7a on the image display device 6.

  On the other hand, the communication device B2 is for making a call with the door phone slave unit C, and a communication unit (not shown) for transmitting and receiving voice data and the like with the door phone slave unit C, a voice An input microphone (not shown), a voice output speaker (not shown), and the like are provided. If the doorphone slave unit C is equipped with a camera, an image captured by the camera of the doorphone slave unit C may be displayed on the image display unit 6 when the doorphone slave unit C operates.

  The camera device A and the intercom base unit B are configured as described above, and the operation of the monitoring system will be described below with reference to FIGS.

  As shown in FIG. 3A, the camera device A always captures a predetermined area at 15 FPS by the imaging unit 10 during activation, and image data P1... Obtained by the imaging unit 10 is an FPGA 12. Is transmitted. The image data P1... Transmitted to the FPGA 12 is sent to the image processing unit 14 by the image transmission unit 12a. On the other hand, the image storage unit 12b takes the time axis to be 5 FPS as shown in FIG. In other words, every second piece of image data P1... Obtained by the image pickup unit 10 (only image data P3, P6, P9, P12, P15...) Is stored in the storage unit 11. Accumulated in.

  The image sent to the image processing unit 14 is analyzed by the image processing unit 14, and when a person is detected, a human body detection signal is output from the image processing unit 14 to the signal processing unit 16. . Further, human detection is also performed by the hot-wire human body detector 2. When a human is detected by the hot-wire human body detector 2, human detection is performed from the hot-wire human body detector 2 to the signal processing unit 16. A signal is output.

  Here, when a human body detection signal is output to the signal processing unit 16 from the image processing type human body detector 1 or the heat ray type human body detector 2 or both at time t1, the signal processing unit 16 transmits a transmission start signal to the FPGA 12. And a notification start signal to the notification unit 3. Thereby, in the alerting | reporting part 3, the alerting | reporting for intruder is performed. This notification is continued until, for example, a notification end signal is output from the signal processing unit 16 at a time 3 seconds after the detection time t1.

  On the other hand, the FPGA 12 that has received the transmission start signal uses the past image transmission function to select an image whose imaging time is approximately the same as the time t0 one second before the detection time t1 from the image data stored by the image storage unit 12b. The data P3 is sequentially transmitted to the YUV / NTSC conversion unit 13, and when the image data P21 whose imaging time is substantially the same as the current time t2 is transmitted to the YUV / NTSC conversion unit 13, the transmission of the past image data is finished. .

  Then, after the transmission of the past image data is completed, the real-time image transmission function (real-time image data (image data P23, P24, P25, P26... P60...)) Being captured by the imaging unit 10 is sequentially converted into the YUV / NTSC conversion unit. 13 is transmitted. Thereafter, when 30 seconds have elapsed from the detection time t1, a transmission end signal is output from the signal processing unit 16, thereby ending the transmission of real-time image data (in the present embodiment, the image data P23, P24 as real-time image data). , P25, P26... P60... Are transmitted to the monitor device B1).

  Image data P3, P6, P9, P12, P15, P18, and P21 that are past image data transmitted to the YUV / NTSC conversion unit 13 in this way, and image data P23, P24, P25, and P26 that are real-time image data. ... P60 are converted from YUV signals to NTSC signals, then output to the transmission unit 17, modulated by the transmission unit 17 for transmission, and sequentially transmitted to the reception unit 4 of the doorphone master unit B.

  On the other hand, in the intercom base B, the image data received by the receiving unit 4 is demodulated by the signal processing unit 5. Then, an image based on the image data demodulated by the signal processing unit 5 is sequentially displayed on the image display unit 6 (that is, the image data P3, P6, P9, P12, P15,. (P18, P21, P23, P24, P25, P26... P60...) And the recording unit 7 sequentially records the images on the storage unit 7a. Then, the image recorded in the storage unit 7a in this way can be displayed on the image display unit 6 by operating the playback unit 8 after the transmission of the image data by the camera device A is completed. It has become.

  Therefore, in the monitoring system of the present embodiment, the time taken for the real-time image (image data P23, P24, P25, P26... P60...) To be displayed on the image display unit 6 is the past image data (image data P3, P6). , P9, P12, P15, P18, P21), that is, 7 frames (about 0.5 seconds) in this embodiment. On the other hand, in the case of transmitting the real-time image data after simply transmitting the past image data as in the prior art, 22 frames until the real-time image (image data P23, P24, P25, P26... P60...) Is displayed. Since past images (image data P1 to P22) are displayed, the time taken to display a real-time image is about 1.5 seconds, which is approximately three times that of the present embodiment.

  Thus, according to the monitoring system of the present embodiment, it can be seen that the time taken until the real-time image is displayed can be greatly reduced.

  In the monitoring system of the present embodiment described above, when the presence of a person is detected by the image processing type human body detector 1 or the hot-wire type human body detector 2 which is a human body detection means, it is compressed and stored with respect to the time axis. The past image data (image data P3, P6, P9, P12, P15, P18, P21) composed of image data having image data (image data P3, P6, P9, P12, P15) whose imaging time is before the detection time t1. ) Are transmitted to the monitor device B1 of the intercom base unit B in the order of the imaging time, and then the real-time image data (image data P23, P24, P25, P26... P60...) Being captured by the imaging unit 10 is transmitted to the monitor device B1. In the monitor device B1, the image data transmitted from the camera device A (image data P3, P6, P9, P12, P15, P18, P21, P2 , P24, P25, P26 ... P60 ... and displays images sequentially image display unit 6 based on), are configured to record.

  Therefore, according to the monitoring system of the present embodiment, even if a person passes by between the time when the past image is displayed and the time when the image is displayed on the monitor device B1 from the detection time, such a person is monitored by the monitor device. There exists an effect that it can display on B1. In addition, the time series of the images displayed on the image display unit 6 of the monitor device B1 do not move back and forth, and an effect is obtained that it is possible to display an image without a sense of incongruity.

  Further, when transmitting image data from the camera device A to the monitor device B1, real-time image data is transmitted after the transmission of the past image data is completed, so the past image data and the real-time image data are transmitted in parallel. Compared to such a case, the number of transmission lines can be reduced, and both the hardware aspect such as the circuit configuration for transmission and the software aspect such as the transmission processing program are low. There is an effect that costs can be reduced.

  In addition, since past image data is not accumulated sequentially but is compressed and accumulated with respect to the time axis, the past image data is compared with the case where the past image data is not compressed with respect to the time axis as in the past. The time from the start of image display to the start of real-time image display can be shortened, thereby producing an effect that the current situation can be immediately confirmed. Further, in the monitoring system of the present embodiment, among the image data group stored in the storage unit 11 by the image storage unit 12b, from the image data whose imaging time is substantially the same as the time t0 one second before the detection time t1, Since the image data group (image data P3, P6, P9, P12, P15, P18, P21) up to image data whose imaging time is substantially the same as the current time t2 is used as past image data, it is displayed last. The imaging time of the past image (image data P21) and the imaging time of the first real-time image (image data P23) to be displayed are substantially the same time. The time difference with the imaging time of the real-time image displayed on the screen is not increased, and there is an effect that it is possible to display an image without a sense of incongruity.

  By the way, the door phone master unit B or the camera device A may be provided with a selection unit that selects whether or not to transmit past image data from the camera device A to the monitor device B1 of the door phone master unit B when detecting a human body. In this case, since it becomes possible to select whether or not to display the past image on the image display unit 6 by operating the selection unit, there is no need for the user to display the past image on the image display unit 6. If it is felt, it is possible to display a real-time image on the image display unit 6 immediately after the human body is detected, and there is an effect that it can be used according to the user's preference.

  By the way, in the above example, in the image data group stored in the storage unit 11 by the image storage unit 12b, the imaging time is determined from the image data whose imaging time is approximately the same as the time t0 one second before the detection time t1. A group of image data (image data P3, P6, P9, P12, P15, P18, P21) up to image data that is substantially the same time as the current time t2 is used as past image data. Of the image data group stored in the storage unit 11 by the unit 12b, an image data group having image data whose imaging time is at or before the detection time t1 may be used. For example, in the image data group stored in the storage unit 11 by the image storage unit 12b, the imaging time is substantially the same as the detection time t1 from the image data at the time t0 one second before the detection time t1. A group of image data up to image data (image data P3, P6, P9, P12, P15) may be used as past image data.

  In this embodiment, the time t0 is 1 second before the detection time t1, but the time t0 may be 0.5 seconds before the detection time t1, 2 seconds before, 3 seconds before, or the like. The user may be able to freely set the time t0 according to his / her preference.

  On the other hand, in the present embodiment, the monitoring system is incorporated in the door phone system, but, of course, the monitoring system and the door phone system may be separately constructed.

It is explanatory drawing which shows the block configuration of the monitoring system of this invention. It is explanatory drawing which shows the installation condition of the monitoring system of this invention. (A) is explanatory drawing of the image data obtained by an imaging part, (b) is explanatory drawing of the image data accumulate | stored in the memory | storage part of a camera apparatus, (c) is transmitted to a monitor apparatus. It is explanatory drawing of the image data.

Explanation of symbols

A camera device B door phone master device B1 monitor device 1 image processing type human body detector 10 imaging unit 11 storage unit 12a image transmission unit 12b image storage unit 2 hot-wire human body detector 6 image display unit 7 recording unit 7a storage unit 8 reproduction unit

Claims (4)

  A camera device; and a monitor device that monitors an image obtained by the camera device, wherein the camera device detects a human body detecting means for detecting the presence of a person in a predetermined area, and an imaging means for imaging the predetermined area. , Image storage means for compressing and storing a group of image data obtained by the imaging means, and image data stored by the image storage means when the human body detection means detects the presence of a person In the group, past image data consisting of image data groups having image data whose imaging time is earlier than the detection time is transmitted to the monitor device in the order of the imaging time, and when transmission of the past image data is completed, imaging is being performed by the imaging unit. Transmission means for transmitting the real-time image data to the monitor device, the monitor device comprising an image display means and an image based on the image data transmitted from the camera device. Monitoring system characterized in that it comprises successively a recording means for recording, and reproducing means for displaying an image recording means has recorded the image display means.   The monitoring system according to claim 1, wherein the camera device is installed outdoors, and the monitor device is installed indoors, and is provided in a door phone master unit for a door phone system that enables a call between a house and an outside. .   The past image data is composed of image data groups from the image data stored by the image storage means to the image data whose imaging time is before the detection time to the image data whose imaging time is substantially the same as the current time. The monitoring system according to claim 1 or 2.   The monitoring system according to claim 1, further comprising selection means for selecting whether or not to transmit past image data from the camera device to the monitor device.

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