JPH0738883A - Video monitor device - Google Patents

Abstract

PURPOSE:To obtain the video monitor device which efficiently drives an infrared light emission device provided on a slave machine side. CONSTITUTION:Plural light emitting devices 14-18 which differ in irradiation area and emit infrared light are provided on the side of the slave machine 1 and a selecting means 31 which selectively makes the light emitting devices emit light is provided. Image data in an area that the light emission device selected by the selecting means irradiates with the infrared light are written in an image memory 5 to update the image data, which are read in the address order of the image memory 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image monitor device for monitoring an image of a subject at a distant place, and particularly when the surroundings are dark at night or the like, infrared illumination is performed to show the state of a visitor or the like from the inside to the outside. The present invention relates to a video monitor device such as a TV intercom device that can be confirmed.

[0002]

2. Description of the Related Art In a TV door intercom system, if the entrance is dark like at night, the visitor's video cannot be captured by the TV camera of the TV intercom slave, so it is necessary to provide some illumination means. When this lighting means has some purpose other than lighting for a TV door phone, such as a front light, the lighting means can be kept on at all times. However, if there is no other purpose, in order to save power consumption, when the visitor appears at the front door or when the visitor pushes the call button of the TV doorphone handset, the lighting means is turned on. Has become.

In this case, there is a problem that a change in the brightness of the entrance due to the start of lighting of the lighting means may surprise a visitor. Therefore, JP-A-62-247
As described in Japanese Patent Publication No. 89, the CCD, which is an image pickup element of a TV camera, which is invisible to the human eye, is illuminated by infrared rays as a lighting means of a TV intercom slave. Usually, 4 to 6 infrared LEDs are required to obtain the amount of infrared light necessary for night photography, and each infrared LED is connected in series and driven with a current of about 50 mA.

By the way, in recent years, in order to accurately capture the appearance of a visitor, a TV doorphone handset using a wide-angle lens as an image pickup lens of a TV camera has been developed. In this case, since the image pickup area expands, it is necessary to increase the number of infrared LEDs. Normally, a DC voltage of about 15V is supplied to the TV intercom slave, and if the forward voltage drop of the infrared LED is set to about 1.5V, the infrared LE that can be driven in series connection can be used.
D is several, and it is necessary to connect them in parallel in order to drive many infrared LEDs. For example, 20 infrared L
When driving the ED, four infrared LEDs connected in series
You can connect 5 columns in parallel, but if you connect like this,
A current of about 250 mA will be consumed.

Further, recently, as seen in Japanese Patent Application Laid-Open No. 2-114786 and a document (electronic technology April 1993), a partial area of an image captured by a wide-angle lens of a TV doorphone handset is digitally processed. A TV intercom device for displaying an enlarged image has been developed. In such a TV door intercom device, although all the infrared LEDs are turned on although only the illumination of the enlarged area is required, the current is wastefully consumed.

[0006]

When a wide-angle lens is adopted to capture an image of a subject having a wide field of view at night as in the above-mentioned conventional apparatus, many infrared LEDs must be driven, resulting in a large power consumption. In addition, there is a problem that the power supply circuits of the TV intercom slave and the TV intercom master become large. In addition, the amount of heat generated by these power supply circuits also increases.

Further, in the TV doorphone device which is already in use, even if it is attempted to replace only the TV doorphone slave unit with the wide-angle lens type slave unit, it is not possible because the power supply capacity of the TV doorphone master unit is insufficient. In such a case, there is a problem that the TV intercom base unit must be replaced at the same time.

Furthermore, when a partial area of the screen is enlarged and displayed, the infrared LEDs of all areas are turned on even though only that area is being watched, so that many areas are displayed. The current is wasted. Even when a wide-angle lens is used to magnify a partial area of the screen, the wide-angle lens constantly illuminates the entire area of the wide field of view, so the illuminance can be set to a sufficient value in terms of power consumption. However, since the amount of light emitted from the infrared LED is small, there is a problem that the subject such as a visitor may not be sufficiently confirmed.

[0009]

In order to solve the above problems, the present invention has the following structure: (1) A slave unit having a television camera and a television camera of the slave unit. In a video monitor device comprising a master unit equipped with a display device for displaying an image, the slave unit is provided with a light emitting device for emitting infrared light, which is capable of illuminating a part of the entire image pickup area. A plurality of different lighting means, a selection means for selecting one or a plurality of light emitting devices from the plurality of light emitting devices, and a driving means for turning on the light emitting device selected by the selection means. , It is possible to selectively illuminate a part of the entire imaging area.

(2) Further, a light emitting device for emitting infrared light, which is capable of illuminating a part of the entire image pickup area, is provided in the slave unit, and the illumination area is different, and the entire image pickup area can be illuminated. A time-division drive for time-divisionally driving the plurality of light-emitting devices by time-divisionally selecting one or several light-emitting devices among the plurality of light-emitting devices in the lighting means. And means for illuminating the entire imaging area in a time-division manner.

(3) Furthermore, a light emitting device that emits infrared light, which is capable of illuminating a part of the entire image pickup area, is provided in the child device, and the illumination areas are different, and the entire image pickup area is illuminated. A plurality of lighting means provided so as to be possible, and one or several light emitting devices among the plurality of light emitting devices in the lighting means are selected in a time division manner, and the plurality of light emitting apparatuses are time division driven. Drive means, an image memory for recording image data from the television camera, recording means for writing image data of an area illuminated by the time division drive means of the illumination means in the image memory, and the image memory The reading means for sequentially reading the image data of all the areas and interpolating the image of the area not illuminated with the image data when the illumination is performed is provided.

(4) Further, in the apparatus described in (1) above, the selection of the plurality of light emitting devices by the selection means is performed by the area designating means provided on the master side.

(5) Furthermore, in a video monitor device comprising a slave unit having a television camera and a master unit having a display device for displaying an image sent from the television camera of the slave unit, the slave unit In addition, an illuminating means provided with a plurality of light emitting devices for emitting infrared light capable of illuminating a part of the entire imaging area and different illuminating areas are provided, and all the light emitting devices of the illuminating means are connected. Constant current driving means,
A configuration is provided in which a selection unit that selects one or a plurality of light emitting devices among the plurality of light emitting devices and a driving unit that lights the light emitting device selected by the selection unit are provided.

(6) Further, in the device described in (1) above, each of the plurality of light emitting devices constituting the illumination means is formed by one or several infrared LEDs which emit serial infrared light.

(7) Further, in the apparatus described in (2) above, the time division driving of the plurality of light emitting devices by the time division driving means is performed based on the number of times of light emission of the light emitting device that irradiates the peripheral portion of the image pickup area. The light emitting device that irradiates the central portion is controlled so that the number of times of light emission is greater.

[0016]

According to the structure of the above-mentioned claim 1, the selecting means controls the illuminating means provided on the slave side and comprising a plurality of infrared light emitting devices for illuminating a part of the entire image pickup area. Since one or a plurality of infrared light emitting devices among the infrared light emitting devices are selectively driven, an image monitor device for selectively illuminating a partial area of the entire imaging area that requires illumination is obtained. be able to.

According to the above-mentioned structure of claim 2,
A plurality of infrared light emitting devices provided on the child device side, which have different illumination regions and are capable of illuminating the entire image pickup region, are driven by time division driving means to select one or several time division elements. Therefore, the illumination of the entire imaging area of the video monitor device can be performed in a time-division manner.

Further, according to the structure of claim 3,
Image data of the area illuminated by the plurality of infrared light-emitting devices that are time-division driven as described above is sequentially written to the image memory for recording image data from the television camera provided on the slave side, Since the image data written in the memory is sequentially read by the reading means regardless of the writing order, it is possible to interpolate the image of the area not illuminated by the image data when the illumination is performed.

Further, according to the structure of claim 4,
A plurality of infrared light emitting devices having different illumination areas for illuminating a part of the entire imaging area provided on the slave side are selectively driven by the selecting means by a command from the area specifying means provided on the master side. Therefore, it is possible to obtain the video monitor device capable of selectively instructing the illumination of the area to be imaged from the master unit side.

According to the above-mentioned structure of claim 5,
Since a plurality of infrared light emitting devices having different irradiation areas provided on the slave unit are driven by one constant current driving means, the whole infrared light emitting device is irrespective of the number of light emitting devices selected to emit light simultaneously by the selecting means. It is possible to drive with a constant current, and it is possible to drive a selected light emitting device with a large current when the number of light emitting devices driven at the same time is small.

According to the above-mentioned structure of claim 6,
Infrared LED that emits one or several infrared lights for each of the plurality of light emitting devices that emit infrared light provided on the slave unit side.
Since the light emitting device on the slave side can be downsized, the required illuminance and illuminance distribution of each illumination area can be freely set according to the number of infrared LEDs used, the connection method, the irradiation area distribution, and the like. be able to.

According to the above-mentioned structure of claim 7,
The time-division driving means selects a plurality of light-emitting devices so that the infrared light-emitting device that irradiates the central portion emits more light than the infrared light-emitting device that irradiates the peripheral portion, and performs time-divisional driving. Therefore, the central part of the image data written in the image memory can be updated more frequently, and the subject to be monitored such as a visitor often appears near the central part of the screen. You can catch it.

[0023]

FIG. 1 is a block diagram of an embodiment of the present invention.
In FIG. 1, 1 is a TV intercom slave, and 2 is a TV intercom master. The TV intercom slave 1 records a TV camera 3 for photographing a subject such as a visitor, an A / D converter 4 for converting a video signal from the TV camera 3 into digital image data, and one frame of image data. Image memory 5, a D / A converter 6 for converting digital image data in the image memory 5 into a video signal, a write control circuit 7 for controlling writing of image data in the image memory 5, an image from the image memory 5 A read control circuit 8 for controlling the reading of data,
A writing area designating circuit 9 for designating an area to be written in the image memory 5 in one frame of image data, and a reading area designating circuit 10 for designating an area to be read from the image memory 5 in one frame of image data. A reception circuit 11 for receiving an operation signal transmitted from the intercom base unit 2, an operation signal decoder 12 for discriminating an operation signal received by the reception circuit 11, and a slave unit power supply unit 13 for supplying power to the intercom slave unit 1. Infrared L that allows you to shoot the subject by irradiating infrared light even in dark lighting such as at night
ED groups 14 to 18, transistors 19 to 23 for driving the infrared LED groups 14 to 18, resistors 24 to 28 for absorbing a potential difference, a constant current source 29, the transistor 19 described above.
Driver 23 for driving ~ 23, infrared LE for lighting
It is composed of a selection circuit 31 for selecting the D group.

The TV intercom base unit 2 is a monitor 32 for displaying a video signal from the TV intercom slave unit 1,
1/4 of the total screen area is "top""bottom""left""right"
The area designating switch 33 for moving to, the area designating switch 33 for enlarging or canceling the area designated by the area designating switch 33, the operation signals from the area designating switch 33 and the changing switch 34 And a power supply circuit 37 for supplying power to the slave unit.

Next, the operation of the embodiment will be described. When the visitor presses a call button (not shown) installed on the slave unit to power on and reset the TV intercom slave unit 1, the selection circuit 31 inputs the vertical synchronization signal VD of the TV camera 3. , And outputs pulses Q1 to Q5 as shown in FIG. 2 to the driver 30, for example.

The pulse Q1 becomes "Hi" in the first even field and odd field, and becomes "Low" in the second even field and odd field, and so on. "H in the field
i), the pulse Q2 is “Hi” in the 2nd, 10th, ..., 2 + 8 (n−1) th even and odd fields, and the pulse Q3 is , 4th, 12th, ..., 4+
"Hi" in the 8 (n-1) th even field and odd field, and the pulse Q4 is the sixth, 14th, ..., 6 + 8 (n-1) th even field. "Hi" in the odd field, and the pulse Q5 is the 8th, 16th, ..., 8 + 8 (n
-1) "H" in the even and odd fields
The pulse width of each of the pulses Q1 to Q5 is 2/60 sec.

The driver 30 receives the input pulse Q1.
When Q5 is "Hi", the corresponding transistors 19 to 23 are selectively driven.
Is turned on, the infrared LED group 14 emits infrared light, which is emitted every 2/60 sec and every 4/60 sec. Similarly, the driver 3 is driven by the pulses Q2 to Q5.
When 0, the corresponding transistors 20 to 23 are selectively set to “O”.
When turned "N", each of the transistors 20 to 2 turned "ON"
Infrared LED groups 15-18 corresponding to 3 emit infrared light, and the light emission is 16/60 sec in 2/60 sec.
The infrared LED groups 14 to 18 are driven in a time division manner.

On the other hand, each of the infrared LED groups 14 to 18 is arranged so as to irradiate a partial area of the entire image pickup area. That is, as shown in FIG. 3, in the entire imaging area, the infrared LED group 14 has the central area A as the infrared LEDs.
The group 15 has an upper left area B, and the infrared LED group 16 has a lower left area C
The infrared LED group 17 is in the lower right area D, and the infrared LED group 1 is
8 is installed so that the upper right area E is focused on.

Therefore, as described above, by using the pulses Q1 to Q5, the infrared ray L is generated by the driver 30 and the transistors 19 to 23.
When the ED groups 14 to 18 are driven, the infrared LED group 14
Areas A to E (hereinafter, referred to as “illumination areas”) illuminated by ˜18 change as follows.

.. → Area A → Area B → Area A → Area C → Area A → Area D → Area A → Area E → Area A → ...

In this embodiment, the illumination area is divided into five areas A to
E is divided and the central region A is time-divisionally driven at a rate four times that of the other four regions B to E. However, the number of divided illumination regions and the ratio of the number of driving times of the other regions to the central region are divided. Etc. may be appropriately determined according to the situation of use. this is,
This can be achieved by appropriately determining the pulses Q1 to Q5 and the like synchronized with the vertical synchronizing signal VD from the selection circuit 31.

By the way, the video signal from the television camera 3 is converted into a digital signal by the A / D converter 4 and then written into the image memory 5 and then output, but only the image data in the illumination area is output. The updated image data other than the illumination area is the same as the previous image data. The image memory 5 is shown in FIG.
As shown in, a memory array of (4C) rows x (4R) columns is provided, and the image data on the upper left of the screen has an address (0, 0).
Further, the pixels of the entire screen are mapped in the image memory so that the image data at the lower right of the screen corresponds to the addresses (4C, 4R), and the image data of the illumination areas A to E are respectively the areas 1 to 5. Written in. That is, since the address of the memory array of the image memory and the position of the pixel on the screen have a one-to-one correspondence, the image data of the areas A to E are combined on the image memory.

In this case, since the illumination area A overlaps with the illumination areas B to E at the four corners, the image data of the area 1 is irrespective of where the illumination area is.
All or part of it will always be updated. Since an object to be monitored, such as a visitor, is often displayed near the center of the screen, it is desirable to control recording and updating of the illumination area and image data in this way.

As described above, while the image data recorded in the image memory 5 is updated, all the image data recorded in the image memory 5 are addressed (0, 0).
To sequential addresses (4C, 4R), D / A
After being converted into an analog signal by the converter 6, it is displayed on the monitor 32 provided in the TV intercom base unit 2. By controlling the writing and reading to and from the image memory 5 as described above, it is possible to display an image without flicker on the screen caused by the time-division driving of the illumination.

FIG. 2 shows the timing of writing and reading to and from the image memory 5. Here, a CCD is used as an image pickup element in the television camera 3, and the charge accumulated in the CCD element during one field is read out from the CCD element in the next field. Therefore, writing to the image memory 5 is performed. Is performed one field after the illumination is performed. Since the reading from the image memory 5 is performed every field, a continuous image of 1/60 sec can be obtained.

As shown in FIG. 1, the writing area designating circuit 9 sends a pulse Q indicating the current illumination area from the selecting circuit 31.
Receiving 1 to Q5, the writing control circuit 7 is designated with an area (hereinafter, referred to as a "writing area") in which image data is written. The write control circuit 7 includes the A / D converter 4
Of the image data from the above, only the image data in the writing area is written in the image memory 5. In this way, the infrared LE
The image data of the illumination area illuminated by the D groups 14 to 18 in a time division manner can be sequentially written in a corresponding position of the image memory 5 in a time division manner. The image data of the entire screen written in the image memory 5 is sequentially read by a control signal from the read control circuit 8. This state
This is called the auto scan mode.

By the way, as shown in FIG. 5, a region that is 1/4 of the area of the entire screen is called a selection region SE.
To move "up", "down", "left", and "right", the area designating switch 3 provided on the TV intercom base unit 2 shown in FIG.
Operate 3. When the area designation switch 33 is input in the wide auto scan mode described above, "up"
The code signal CS corresponding to each of the “down”, “left” and “right” switches is transmitted from the transmission circuit 35 to the TV intercom subunit 1. The code signal CS transmitted from the TV intercom master unit 2 is received by the receiving circuit 11 provided in the TV intercom slave unit 1, and is decoded by the operation signal decoder 12. The read area designating circuit 10 counts the operation signals of "up", "down", "left" and "right" from the operation signal decoder 12 to determine the position of the selected area.

On the other hand, when displaying an image of a specific area on the monitor 32 of the TV door phone master unit 2, the area designating switch 33 and the changeover switch 34 provided on the TV door phone master unit 2 are operated, but the operation signal decoder 12 operates. Once the area designation switch 33 and the changeover switch 34 are input, the detection signal DS is sent to the selection circuit 31. Upon receiving the detection signal DS, the selection circuit 31 stops the time-divisional driving of the infrared LED group as shown in FIG. 2 and turns on only the infrared LED group corresponding to the designated area. That is, the selection circuit 31 receives the central coordinate data CD of the selected area SE from the read area designating circuit 10, determines which area among the areas I to IV shown in FIG. As shown in FIG. 7, the infrared LED groups 14 to 18 of FIG.
Illumination of the irradiation areas A to E is selectively performed.

That is, it is determined which of the nine areas from the area shown in FIG. 6 the central coordinates of the selected area SE selected by the area designating switch 33 belongs to, and if it belongs to the area as shown in FIG. Irradiation area B by LED group 15,
If it belongs to the region, the irradiation regions B and E are set by the infrared LED groups 15 and 18, if it belongs to the region, the irradiation region E is set by the infrared LED group 18, and if it belongs to the region, infrared L
Irradiation areas B and C by the ED groups 15 and 16, irradiation area A by the infrared LED group 14 when belonging to the area, irradiation areas D and E by infrared LED groups 17 and 18 when belonging to the area, If it belongs to the area, the irradiation area C is determined by the infrared LED group 16, if it belongs to the area, the irradiation areas C and D are determined by the infrared LED groups 16 and 17, and if it belongs to the area, the irradiation area D is determined by the infrared LED group 17. Irradiate each.

In this case, the infrared LED groups 14-18 are shown in FIG.
Since it is connected to the constant current source 29 as shown in FIG. 5, the entire drive current is kept constant even if the number of driven infrared LED groups changes. For example, if the constant current source is set to 50 mA, when one infrared LED group is selected as shown in the area of FIG.
It is driven by the current of A, and when two infrared LED groups are selected, as shown in the area ,,, the current is divided into about two in each infrared LED group, and it is driven at about 25 mA. It will be.

The detection signal DS from the operation signal decoder 12 is also input to the write area designating circuit 9. When the write area designation circuit 9 receives the detection signal DS, it ignores the input of the pulses Q1 to Q5 from the selection circuit 31,
Make the writing area full screen. Eventually, the image data of the entire screen is written in the image memory 5, and the image data of the entire screen is sequentially output by the read control circuit 8. Therefore, the video signal from the television camera 3 is displayed on the monitor as it is. . Therefore, the illuminated area illuminated by the infrared light from the infrared LED group is clearly displayed, and the other area becomes a dark screen at night.

In this case, if the area designation switch 33 is input, the area to be illuminated can be moved, and the current is passed only to the necessary infrared LED group, so that power consumption is not wasted.
Further, rather than evenly allocating a constant current to all the infrared LED groups, a large amount of current can be flown to give bright illumination by focusing on a small number of LED groups. This state is called a wide manual mode.

When the changeover switch 34 is input once in the wide auto scan mode or the wide manual mode, the transmitting circuit 35 outputs the code signal CS, which the receiving circuit 11 receives, and the operation signal decoder 12 receives.
Then, the switching signal CH is output to the read control circuit 8. When the read control circuit 8 inputs the switching signal CH, the selected area SE determined by the read area designating circuit 10 is enlarged and displayed at an area ratio of 4 times. Since a general method of image processing may be used for the enlarged display method, the description thereof will be omitted here. This state is called a zoom mode.

Area designation switch 3 in the zoom mode
When 3 is pressed and a predetermined area is designated, the read area designating circuit 10 moves the selected area SE to the predetermined area, and the result is input to the read control circuit 8, and at the same time, the central coordinate of the selected area SE. Since the data CD is input to the selection circuit 31, the illuminated area and the enlarged area move at the same time, and the data is displayed on the monitor 32 of the TV intercom base unit 2.
An image of a predetermined area that is doubled in size is displayed. When the changeover switch 34 is pressed again, the zoom mode is released and the original wide manual mode is restored.

Although the above embodiment describes the case where the present invention is applied to the TV door intercom apparatus, it can be widely used for the video monitor apparatus for monitoring the subject from a place distant at night. Further, in the above-mentioned embodiment, each infrared LED group is formed by four infrared LEDs, but one or several infrared LEDs may be formed depending on the application or the performance of the infrared LED.

[0046]

Since the present invention is constructed as described above, the following effects can be obtained. Since it is possible to selectively drive multiple infrared light emitting devices with different irradiation areas provided on the slave unit side, it is possible to illuminate only the necessary area and the power consumption on the slave unit side is low. It is possible to obtain a good video monitor device.

Since a plurality of infrared light emitting devices having different irradiation areas can be driven in a time division manner,
It is possible to illuminate a wide range of imaging areas with low power consumption.

Furthermore, the image data of the illuminated area is written into the image memory by time-divisional driving of a plurality of infrared light emitting devices having different irradiation areas, and the stored content of the image memory is read out. Since it is designed to be performed sequentially from the end, the image data of the area where the infrared light is not irradiated can be interpolated with the image data when the infrared light is irradiated, and the time division drive of the illumination. It is possible to suppress the flickering of the screen due to the change in brightness caused by.

Furthermore, since the infrared light emitting device can be selected by the area designating switch provided on the master unit side, the master unit can appropriately illuminate the area to be manually monitored. .

Further, since a plurality of infrared light emitting devices provided on the slave unit side and having different irradiation regions are connected to one constant current source, the power consumption required for illumination can be kept constant. In addition, it is not necessary to have an extra margin in the capacity of the power supply circuit, and it is possible to drive with more current by reducing the number of infrared light emitting devices to be turned on, and a clear image of the desired area can be obtained. Obtainable.

Further, by constructing the infrared light emitting device with one or several infrared LEDs for emitting infrared light, the light emitting device on the side of the child device can be downsized and each illumination area can be reduced. It is possible to freely set the required illuminance and the illuminance distribution.

Further, the number of times of light emission of the infrared light emitting device is set by the time-division driving so that the central portion is larger than the peripheral portion, so that the image data is updated more frequently in the central portion and the visitors are Since an important subject such as is often seen in the center, it can be properly captured.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a timing chart used for explaining the operation of the embodiment of the present invention.

FIG. 3 is a layout diagram of illumination areas according to an embodiment of the present invention.

FIG. 4 is a memory map diagram of an image memory used in the present invention.

FIG. 5 is an explanatory diagram of an imaging selection area according to an embodiment of the present invention.

FIG. 6 is an explanatory diagram of a selection area according to the present invention.

FIG. 7 is a diagram showing the relationship between the position of the central coordinates of the selected area and the irradiation area of the light emitting device to be turned on in the present invention.

[Explanation of symbols]

 1 TV intercom slave unit 2 TV intercom master unit 3 TV camera 5 Image memory 7 Write control circuit 8 Read control circuit 14, 15, 16, 17, 18 Infrared LED 19, 20, 21, 22, 23 Transistor 29 Constant current source 30 driver 31 selection circuit 32 monitor 33 area designation switch

Claims (7)

[Claims] 1. A video monitor apparatus comprising a slave unit having a television camera and a master unit having a display device for displaying an image sent from the television camera of the slave unit, wherein the slave unit is fully imaged. Illuminating means provided with a plurality of light emitting devices that emit infrared light so as to illuminate a part of the regions, and one or more of the plurality of light emitting devices. Is provided, and drive means for turning on the light emitting device selected by the selecting means is provided, so that illumination of a partial area of the entire imaging area can be selectively performed. Video monitor device. 2. A video monitor device comprising a slave unit equipped with a television camera and a master unit equipped with a display device for displaying an image sent from the TV camera of the slave unit. Illuminating means provided with a plurality of light emitting devices for emitting infrared light capable of illuminating a part of the areas, the illumination areas being different, and the plurality of illumination means for illuminating the entire imaging area. And a time-division driving unit for time-divisionally driving the plurality of light-emitting devices by time-divisionally selecting one or several of the light-emitting devices of FIG. Video monitor device characterized by the above. 3. A video monitor device comprising a child device having a television camera and a parent device having a display device for displaying an image sent from the television camera of the child device, wherein the child device is fully imaged. Illuminating means provided with a plurality of light emitting devices for emitting infrared light capable of illuminating a part of the areas, the illumination areas being different, and the plurality of illumination means for illuminating the entire imaging area. Time-division driving means for time-divisionally driving the plurality of light-emitting devices by time-divisionally selecting one or several of the light-emitting devices, and an image memory for recording image data from the television camera. And recording means for writing image data of an area illuminated by the time-division driving means of the illumination means to the image memory, and image data of the entire area of the image memory are sequentially read out to perform illumination. Video monitoring device, characterized in that provided reading means for interpolating an image area not in the image data when the illumination was done. 4. The video monitor apparatus according to claim 1, wherein a plurality of light emitting devices are selected by the selecting means by an area designating means provided on the master side. 5. A video monitor device comprising a child device having a television camera and a parent device having a display device for displaying an image sent from the television camera of the child device, wherein the child device is fully imaged. Illuminating means provided with a plurality of light emitting devices for emitting infrared light capable of illuminating a part of the regions, and a constant current to which all the light emitting devices of the illuminating means are connected. An image monitor provided with a driving means, a selecting means for selecting one or a plurality of light emitting devices from the plurality of light emitting devices, and a driving means for turning on the light emitting device selected by the selecting means. apparatus. 6. An image monitor apparatus according to claim 1, wherein each of the plurality of light emitting devices forming the illumination means is formed by one or several infrared LEDs emitting infrared light. Monitor device. 7. The image monitor apparatus according to claim 2, wherein the time-division driving of the plurality of light-emitting devices by the time-division driving means determines the central part of the imaging region from the number of times of light-emission of the light-emitting device irradiating the peripheral part of the imaging region. An image monitor device, characterized in that the light emitting device for irradiation is controlled so that the number of times of light emission increases.