KR20120095681A - Image sensor and photographing apparatus having the same - Google Patents

Abstract

PURPOSE: An image sensor and a photographing device including the same are provided to reduce unnecessary power consumption by turning on an IR-LED in an operation of a motion detection function. CONSTITUTION: A control unit(142) processes a digital signal and an image signal applied from an ADC(Analog to Digital Converter)(141). A motion detection unit(143) detects a motion from an output image of the control unit. The motion detection unit outputs a power off signal and a light emitting control signal. A DAC(Digital to Analog Converter)(144) converts the output image into an analog signal. The DAC selectively outputs the converted image output signal according to the activation of the power off signal. A light emitting control unit(145) selectively controls a turn on or turn off operation of a light emitting unit(130).

Description

[0001] IMAGE SENSOR AND PHOTOGRAPHING APPARATUS HAVING THE SAME [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image sensor and a photographing apparatus including the same, and more particularly, to an image sensor for converting an external optical image signal into an electric image signal.

Generally, an image sensor is an apparatus that converts an external optical image signal into an electric image signal. In particular, a CMOS image sensor is an image sensor manufactured using CMOS manufacturing technology. In a CMOS image sensor, each pixel stores a light signal that is copied at a corresponding portion of the subject by using a photodiode, stores the charge, and converts the amount of charge, which is proportional to the number of accumulated electrons, Lt; / RTI >

Image sensors are divided into a CMOS image sensor using complementary-MOS (CMOS) technology and a CCD image sensor using charge coupled device (CCD) technology, all of which are manufactured using semiconductor technology.

Such a CMOS image sensor is a device widely used in various electronic products such as a mobile phone, a camera for a PC (Personal Computer), a video camera, a digital camera, and the like.

The CMOS image sensor is easier to drive than the CCD that was used as an image sensor and can integrate a signal processing circuit on a single chip, thus enabling a system on chip (SoC), which enables miniaturization of the module. . In addition, since there is a lot of advantages such as the fact that the set-up CMOS technology can be used in compatibility with the conventional technology, the demand for the CMOS technology is rapidly increasing.

2. Description of the Related Art A photographing apparatus including an image sensor, such as a digital camera, a camcorder, and a portable terminal having a camera function, captures an image coming through a lens with an image sensor to acquire a video signal. Then, the video signal is converted into digital video data and displayed on a liquid crystal screen as a preview screen. When the user presses the shutter key while the preview image is displayed, the image data is compressed and stored as image data.

1 is a configuration diagram of a photographing apparatus including a conventional image sensor.

The conventional photographing apparatus includes a sensor unit 10 and a video recorder 20. [ Here, the sensor unit 10 includes an image sensor 11, a light emitting device 12, an image sensor driving unit 13, a pyroelectric infrared sensor 14 (hereinafter referred to as a PIR sensor) And a driving unit 15. The video recorder 20 comprises a digital video recorder including a hard disk 21.

The image sensor 11 photographs a subject under the control of the image sensor driving unit 13 and outputs an analog or digital video image output signal to the video recorder 20.

The light emitting device 12 is composed of a light emitting diode (LED) or an infrared (IR) light emitting diode, and outputs an infrared light source to the outside.

The image sensor driving unit 13 controls the driving of the image sensor 11 and converts the image obtained through the image sensor 11 to output the image output signal to the video recorder 20. [

The PIR sensor 14 detects the presence of a person under the control of the PIR sensor driving unit 15 and outputs a PIR sensor detection signal to the video recorder 20.

The PIR sensor driving unit 15 controls driving of the PIR sensor 14 and converts the image obtained through the PIR sensor 14 to output a PIR sensor detection signal to the video recorder 20. [

The video recorder 20 includes a hard disk 21 therein and stores a video output signal applied from the sensor unit 10 and a PIR sensor detection signal.

In recent years, many conversions products that combine the PIR sensor 14 and the image sensor 11 have been introduced. The conventional photographing apparatus detects the presence or absence of a person through the sensing of the PIR sensor 14.

For example, when the PIR sensor 14 is applied to the security system, if the presence or absence of a person or an animal is detected in the PIR sensor 14, the image is stored on the hard disk 21 through the image sensor 11, Or when the presence of the animal is confirmed, an external beep sound is generated.

Such a conventional photographing apparatus further includes a separate PIR sensor 14 in addition to the image sensor 11 to detect the presence or absence of a person or an animal. Accordingly, a circuit for detecting a video output signal and a circuit for detecting a PIR sensor detection signal, that is, two circuits, must be provided between the sensor unit 10 and the video recorder 20.

As a result, not only the implementation cost of the imaging system including the image sensor is increased, but also the imaging system can not be implemented easily due to various line increases.

On the other hand, the hot-wire sensor device is a device for detecting the presence or absence of a human body in the surveillance area by detecting a change in the value by using infrared rays.

Such a hot-wire sensor device is divided into two types, active and passive, according to its operation principle. In the active hot line sensor device, a receiver and a light emitter are installed in a fixed place and a fixed position, respectively, and the infrared ray emitted from the emitter is received by the receiver. When an object is interposed therebetween, the infrared ray detection of the receiver disappears, Device.

In addition, the passive type heat ray sensor device is a device that installs only a super-type infrared ray sensor having a wide viewing angle, and when the human body approaches the viewing angle, the sensor detects the corresponding infrared ray to generate an alarm.

The PIR sensor 14 used as a motion detection sensor uses a passive infrared ray detection system and uses a so-called infrared ray sensor.

Such an infrared sensor is very susceptible to changes in ambient temperature, and therefore, there is a lot of malfunctions. Further, it can not be installed near a lighting device such as an incandescent lamp or a fluorescent lamp in which a high temperature is generated inside the lighting case.

Meanwhile, in recent years, a camera system used for surveillance in the terminal market has built in a motion detection function and uses a lot of functions for power consumption, such as cutting off power of a video output terminal depending on motion. That is, various functions utilizing motion detection, such as a function of turning off the power of the video output terminal when there is no motion, are built in the camera system.

In the case of a current surveillance camera system, an object is identified by using an IR-LED (Infrared Light Emitting Diode) at low illumination. However, since the IR-LED is always turned on in the low light and the movement of the object is discriminated, there is a limitation in reducing the power consumption.

In particular, in order to detect motion, the brightness of the image must be maintained at an appropriate level. In order to properly maintain the brightness of the image in the low light condition, the brightness of the IR-LED must be turned to a proper level, .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems and has the following objectives.

First, IR-LED (Infrared Light Emitting Diode) control function and Motion detection function are integrated in the image sensor to turn on the IR-LED only during motion detection function, thereby reducing unnecessary power consumption .

Second, a motion is detected through an image sensor without a separate PIR sensor, and the presence or absence of movement of a person (or an animal) can be detected with only one image sensor.

Third, it is possible to detect whether a person, animal or object is moved through the image sensor, and determine whether or not to output the video signal according to whether or not the motion is detected.

Fourth, when the image output signal is applied from the image sensor, the image signal is stored in the storage device, and when the image output signal is not applied, the power saving mode is switched to reduce the current consumed.

Fifth, since the image sensor does not include a separate PIR sensor and performs the motion detection function, the system can be simplified and the system cost can be reduced.

Sixth, in the low light level, the illuminance is determined by using the illuminance sensor, and the infrared light source is outputted to detect the motion, so that the weak point in low light can be solved.

According to an embodiment of the present invention, there is provided an image sensor including an analog-to-digital converter for signal-processing brightness information applied from an illuminance sensor; A controller for receiving and processing a digital signal and an image signal applied from the analog-to-digital converter; A motion detector for detecting a motion in an output image of the control unit and outputting a power off signal and a light emission control signal; A digital-to-analog converter for converting an output image of the control unit into an analog signal and selectively outputting an image output signal converted into an analog signal according to whether the power-off signal is activated; And a light emission control unit for selectively controlling the turn-on or turn-off operation of the light emitting unit according to the light emission control signal.

According to another aspect of the present invention, there is provided a photographing apparatus including an image sensor, including: an illuminance sensor for sensing brightness information; A light emitting unit that operates in accordance with a level of brightness information and is turned on or off according to an operation control signal; And an image sensor for detecting motion in a video signal applied from a lens, selectively outputting an image output signal according to whether motion is detected, and selectively outputting an operation control signal, An analog-to-digital converter for signaling information; A controller for receiving and processing a digital signal and an image signal applied from the analog-to-digital converter; A motion detector for detecting a motion in an output image of the control unit and outputting a power off signal and a light emission control signal; A digital-to-analog converter for converting an output image of the control unit into an analog signal and selectively outputting an image output signal converted into an analog signal according to whether the power-off signal is activated; And a light emission control unit for outputting an operation control signal for selectively controlling the turn-on or turn-off operation of the light emitting unit according to the light emission control signal.

The present invention provides the following effects.

First, IR-LED (Infrared Light Emitting Diode) control function and Motion detection function are integrated in the image sensor to turn on the IR-LED only during motion detection function, thereby reducing unnecessary power consumption .

Second, a motion is detected through an image sensor without a separate PIR sensor, and the presence or absence of movement of a person (or an animal) can be detected with only one image sensor.

Third, it is possible to detect whether a person, an animal, or an object is moved through the image sensor, determine whether or not to output a video signal according to detection, and reduce the consumption current according to the video signal output drive.

Fourth, by determining whether or not to store the image signal of the storage device according to whether the image sensor outputs the image signal, current consumption according to the storage of the image signal can be reduced, and the storage space of the storage device can be used with margin.

Fifth, since the image sensor does not include a separate PIR sensor and performs the motion detection function, the system can be simplified and the system cost can be reduced.

Sixth, since a separate PIR sensor is not provided, wiring related to the PIR sensor can be reduced, thereby facilitating installation of the imaging system product.

Seventh, an illuminance sensor is used to determine the illuminance and the infrared light emitting diode is turned on at a low light level, thereby providing the effect of solving the vulnerability of motion detection in low light.

It will be apparent to those skilled in the art that various modifications, additions, and substitutions are possible, and that various modifications, additions and substitutions are possible, within the spirit and scope of the appended claims. As shown in Fig.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a photographing apparatus including a conventional image sensor. FIG.
2 is a configuration diagram of a photographing apparatus including an image sensor according to an embodiment of the present invention.
3 is a detailed configuration diagram of the image sensor of FIG. 2;
4 is a view for explaining an image sensor control method of FIG. 3;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram of a photographing apparatus including an image sensor according to an embodiment of the present invention.

An embodiment of the present invention includes a photographing apparatus 100 and a storage apparatus 200. [ The photographing apparatus 100 includes an illuminance sensor 110, a lens 120, a light emitting element 130, and an image sensor 140. The storage device 200 includes a synchronization detection unit 210 and a storage unit 220.

Here, the storage device 200 preferably comprises a digital video recorder or the like for storing digital images. The storage unit 220 may include a storage medium such as a hard disk.

First, the ambient light sensor 110 detects ambient brightness information, and the brightness information detected by the ambient light sensor 110 is output to the image sensor 140.

The image sensor 140 selectively controls the turn-on or turn-off operation of the light emitting device 130 according to whether motion is detected from the image input signal applied from the lens 120.

2. Description of the Related Art Recently, in the terminal market, a light emitting diode (LED), an infrared light emitting diode (IR-LED), an infrared light emitting diode (LED) Light emitting diodes) are used as essential elements. That is, the illuminance sensor 110 is used to control the light emitting device 130 according to the illuminance of the surrounding environment.

The image sensor 140 is provided with an analog-to-digital converter for receiving the sensing result of the illuminance sensor 110 and performing signal processing.

The image sensor 140 photographs a subject through the lens 120 and outputs an analog or digital video image output signal to the storage device 200.

That is, the image sensor 140 converts an optical image (i.e., an optical subject signal) input through the external lens 120 into an electrical signal and outputs the electrical signal. Here, an electrical signal output every frame is referred to as a frame image.

The image sensor 140 outputs a frame image having a constant frame rate or a varying frame rate. Here, the image sensor 140 may be a CCD (Charge Coupled Device) type or a CMOS (Complementary Metal-Oxide-Silicon) type.

The light emitting device 130 includes a light emitting diode (LED) or an infrared (IR) light emitting diode, and outputs an infrared light source to the outside.

The image sensor 140 converts the image obtained through the lens 120 and outputs the image output signal to the storage device 200.

In the embodiment of the present invention, the image sensor 140 detects the presence or absence of movement of a person, an animal, or an object and outputs a video output signal to the storage device 200.

For example, when the image sensor 140 is applied to a security system, if the presence or absence of a person or an animal is detected in the image sensor 140, the image is stored in the storage device 200, An external warning sound is generated.

The synchronization detecting unit 210 detects a synchronization signal in an analog video signal applied from the image sensor 140. The analog video signal includes a synchronization signal every frame. When the synchronization signal is detected, it indicates that the video signal is being input.

Therefore, when the synchronization signal is detected from the image signal applied from the image sensor 140, the synchronization detecting unit 210 recognizes that the motion is detected, and stores the image signal in the storage unit 220.

The storage unit 220 may be implemented as a hard disk or the like, and stores a video signal applied through the synchronization detection unit 210.

3 is a detailed configuration diagram of the image sensor 140 of FIG.

The image sensor 140 includes an analog digital converter 141, a controller 142, a motion detector 143, a digital analog converter (DAC) 144, and a light emission controller 145.

An analog-to-digital converter (ADC) 141 provided in the image sensor 140 converts an analog signal corresponding to the brightness information received from the illuminance sensor 110 into a digital signal, .

The control unit 142 outputs the digital signal applied from the analog-to-digital converter 141 to the light emission control unit 145 and outputs the image signal of the object photographed from the lens 120 of the image sensor 140 And outputs it to the motion detector 143.

In the embodiment of the present invention, a motion detector 143 may be included in the image sensor 140 to detect a motion of a person or an animal without separately providing a PIR sensor. In addition, it is possible to detect whether or not an object which can not be detected by the PIR sensor is moved through the image sensor 140.

That is, the motion detector 143 detects the presence or absence of motion in the video signal applied from the controller 142, and outputs the power-off signal P_OFF to the digital-to-analog converter 144 and the emission control signal LED_CON to the emission controller 145 Output.

The digital-to-analog converter 144 converts the digital image signal applied from the controller 142 into an analog signal according to the control of the power off signal P_OFF, and selectively outputs the image output signal to the storage device 200.

The light emission control unit 145 controls the operation state of the light emitting unit 130 according to the illumination information applied from the control unit 142 and the light emission control signal LED_CON applied from the motion detection unit 143, The turn-on or turn-off operation of the light emitting device provided in the light emitting unit 130 is selectively controlled.

Here, the light emitting unit 130 may include a light emitting diode such as a light emitting diode (LED) or an infrared (IR) light emitting diode.

The light emission control unit 145 stores operation information for controlling the turn-on or turn-off operation of the light emitting unit 130.

The emission control unit 145 outputs an operation control signal for controlling the operation of the light emitting unit 130 to the light emitting unit 130 according to the operation information read from the motion detection unit 143.

The operation of the image sensor 140 having such a configuration will be described with reference to FIG.

The motion detector 143 deactivates the power-off signal P_OFF (for example, to a logic low level) when motion is detected from the video signal applied from the controller 142 and outputs the signal to the digital-to-analog converter 144, And outputs the signal LED_CON to the light emission control section 145 (for example, to a logic high level).

The embodiment of the present invention determines whether the digital-to-analog converter 144 is to be output according to whether the power-off signal P_OFF output from the motion detector 143 is activated.

That is, when motion is detected in the video signal, the digital-to-analog converter 144 is operated to output the video signal as it is, and the emission control unit 145 is operated to turn on the light emitting unit 130 And outputs a signal.

At this time, the digital-to-analog converter 144 outputs the video output signal to the storage device 200 only when the power-off signal P_OFF is inactivated and applied from the motion detector 143.

On the other hand, when motion is not detected from the video signal applied from the control unit 142, the motion detection unit 143 activates (e.g., turns the power-off signal P_OFF) to the digital-analog converter 144 And turns off the emission control signal LED_CON (for example, to a logic low level) and outputs it to the emission control unit 145.

That is, when no motion is detected in the video signal, the power supplied to the digital-to-analog converter 144 is cut off according to the power-off signal P_OFF so that the video signal is not output and the emission control unit 145 turns the light- And outputs a control signal for turning off.

The synchronization detector 210 of the storage device 200 detects a synchronization signal in the analog video signal applied from the digital-to-analog converter 144.

That is, the motion detection unit 143 detects a motion when an analog video signal is applied from the digital-to-analog converter 144. Therefore, the synchronization detecting unit 210 detects the synchronization signal and stores the analog video signal in the storage unit 220. [

On the other hand, when the analog video signal is not applied from the digital-to-analog converter 144, the motion detector 143 indicates that no motion is detected, so that the storage device 200 operates in the power save mode. In the power save mode, since the sync detecting unit 210 does not detect the sync signal, the analog video signal is not stored in the storage unit 220.

Thereafter, when a video signal is again applied from the digital-to-analog converter 144 to the synchronization detection unit 210, the storage device 200 ends the power save mode and stores the video signal in the storage unit 220.

In addition, the embodiment of the present invention determines whether the light emission control unit 145 outputs the light emission control signal LED_CON output from the motion detection unit 143 or not.

Referring to FIG. 4, the motion detector 143 detects a vertical synchronization signal from a video signal applied from the controller 142.

Here, the motion detector 143 does not perform a motion detection operation for every frame but performs a motion detection operation only once every several frames. For example, the motion detector 143 determines whether motion has been detected at intervals of the interval T3 in FIG. At this time, the motion interval for motion detection by the motion detector 143 is set in consideration of the information of the input image.

In the normal operation mode of T1, since the motion detection unit 143 detects motion, the light emitting unit 130 can be always turned on at a low light level. To this end, the motion detection unit 143 activates the emission control signal LED_CON to a high level and outputs it to the emission control unit 145, deactivates the power off signal P_OFF to a low level, and outputs it to the digital-analog converter 144.

That is, in the normal operation mode in which motion is detected, the motion controller 145 activates and outputs the emission control signal LED_CON, and the emission controller 145 controls the light emitting unit 130 to be turned on at low illumination.

When no motion is detected for several frames, the motion detector 143 switches to a power down mode as in the T2 period in order to reduce power consumption.

For example, if no motion is detected during the period T4 of FIG. 4, the motion detector 143 enters the power down mode as in the case of T2. At this time, the frame interval of T4 at which the motion detector 143 is to be suppressed to the power-down mode may be preset according to the user's intention.

In the power down mode of T2, the light emission control signal LED_CON is deactivated to a low level to output to the light emission controller 145, and the power off signal P_OFF is activated to the high level to output to the digital-to-analog converter 144.

At this time, the emission control signal LED_CON does not go to the inactive state continuously at the power down mode of T2 but toggles to the high and low levels at intervals of several frames in order to improve the illuminance in the motion detection operation do.

That is, in the power down mode, in order to maintain proper brightness in the frame in which the motion detection operation is started as in (A) and (B), only one frame before the motion detection operation and The motion detection unit 143 controls the emission control signal LED_CON to be in the activated state.

That is, when the emission control signal LED_CON is applied in the activated state in the power down mode, the brightness of the image should be set to an appropriate level for the motion detection operation in the motion detection unit 143. Therefore, the light emission control unit 145 turns on the light emitting unit 130. [

On the other hand, when the light emission control signal LED_CON is applied in the inactive state in the power down mode, the motion detection unit 143 does not perform the motion detection operation, so that the brightness of the image does not have an appropriate level. Therefore, the light emission control unit 145 turns off the light emitting unit 130. [

Thereafter, when motion is detected by the motion detecting unit 143, the power save mode is terminated and the light emitting unit 130 is turned on again.

Meanwhile, there are various methods of detecting motion in the motion detecting unit 143 described above.

For example, a process of receiving a frame image from the control unit 142, a process of generating a difference image between a frame image of a current frame inputted and a frame image of a previous frame, a process of projecting a difference image onto a reference axis, A process of extracting feature information from the projection data, a process of analyzing the trajectory of the feature information, and a process of acquiring motion information of the subject using the analyzed trajectory.

The operation process will be described in detail as follows.

First, a sequential (or non-sequential) frame image is input from the lens 120 through the control unit 142. The received frame image may be a color image or a monochrome image. In the case of a color image, the color image can be utilized as it is or converted to a monochrome image. In the case of a black-and-white image, the entire operation amount of the motion detector 143 can be reduced in detecting the motion of the subject.

The frame image input to the motion detection unit 143 is stored in the image storage unit. Assuming that the current input frame is the n-th frame, a frame image corresponding to the previous frame (n-1) th frame is stored in the image storage unit.

A difference image is generated using the current frame image (n-th frame image) input to the motion detection unit 143 and the previous frame image (n-1) th frame image read from the image storage unit. For any pixel position, the difference in pixel values in the two frame images is set to the pixel value in the difference image.

When generating the difference image, operations such as cropping or masking of the frame image may be additionally preceded according to the motion detection width. Here, the motion detection width means a motion direction, a motion size, and the like of a subject that can be detected by the motion detection unit 143 according to the embodiment of the present invention.

The motion detection unit 143 projects the reference image on the above-described difference image. Projection data for the reference axis is obtained by projecting the difference image onto the reference axis.

The projected data is grouped according to a predetermined method, and the feature information is generated through the difference between the divided groups. The generated feature information is stored in the feature information storage unit and used to acquire motion information such as a locus.

That is, whether or not the motion of the subject is determined is determined by determining whether the trajectory of the feature information with the passage of time has a predetermined form (for example, a sine waveform) based on the feature information. When the size is equal to or greater than a predetermined threshold value, it is determined that there is motion in a specific direction centering on the detection reference point.

In addition, the motion detector 143 may detect motion in the following manner.

The pixel array of the image sensor 140 having pixels in a matrix form detects light from a subject and outputs the sensed light as an electric signal. The motion detector 143 selects the electric signal of the pixel array in units of columns.

Then, the electric signal selected in column units is compared with the reference voltage and output as 1-bit digital data. Thereafter, one bit of digital data is temporarily stored, and the current frame is compared with the temporarily stored previous frame. Counts the number of "1" or " 0 "included in the comparison result data, compares the counted number with the set reference value, and determines whether or not there is movement.

Further, the motion detecting section 143 may detect motion in the following manner.

First, the input image is converted into digital image data via the analog-to-digital converter 141 and output as current frame data. The motion detector 143 sequentially stores the row pixel values as reference frame data in the order of columns. Then, the current frame data of the image is compared with the stored reference frame data, and the correlation coefficient is calculated and stored.

Thereafter, the maximum value of the correlation coefficient is searched and a corresponding local motion vector is output. Then, the motion vector of the entire image is obtained using the local motion vector.

Since the image signal is stored in the storage unit 220 only when the video signal is detected, the embodiment of the present invention can prevent a load from being applied to the storage unit 220, And can contribute to prolonging the life of the product of the storage device 200. [0053] In addition, it is possible to reduce current consumption due to input / output, driving and storage of a video signal.

Further, the embodiment of the present invention detects illuminance through the illuminance sensor 110, and turns on the light emitting element through the light emitting portion 130 in a dark environment of low illumination. Accordingly, the image sensor 140 receives the motion-related image and does not have any difficulty in detecting the motion through the motion detection unit 143.

In addition, the embodiment of the present invention allows the light emitting unit 130 to be turned on only when the light emission control signal LED_CON is activated at a low light level, thereby reducing power consumption and heat generation of the system caused by the light emitting unit 130 .

Particularly, in the embodiment of the present invention, the motion detection function according to the motion detection unit 143 and the control function of the light emitting unit 145 according to the emission control unit 145 are simultaneously incorporated in the image sensor 140, So that unnecessary power consumption can be reduced.

That is, in the embodiment of the present invention, in the frame not performing the motion detection function, the light emitting unit 130 is turned off and the light emitting unit 130 is turned on only in the frame performing the motion detection function, 130) and the amount of heat generated by the system.

Embodiments of the present invention can be applied to a closed circuit television (CCTV), a digital video recorder (DVR), a door camera, a digital camera, a camcorder, The present invention can be applied to an imaging apparatus such as a camera.

Claims (16)

An analog-to-digital converter for processing the brightness information applied from the illuminance sensor;
A controller for receiving and processing a digital signal and an image signal applied from the analog-to-digital converter;
A motion detector for detecting a motion in an output image of the controller and outputting a power off signal and a light emission control signal;
A digital-to-analog converter for converting the output image of the controller into an analog signal and selectively outputting the image output signal converted into the analog signal according to whether the power-off signal is activated; And
And an emission control unit for selectively controlling the turn-on or turn-off operation of the light emitting unit according to the emission control signal. The image display apparatus of claim 1, wherein when the motion is detected, the power off signal is inactivated to output the image output signal and the emission control signal is activated to output a control signal for turning on the light emitting unit sensor. 2. The image display apparatus according to claim 1, wherein when the motion is not detected, the power-off signal is activated so that the output of the video output signal is interrupted and the light-emission control signal is inactivated to output a control signal for turning off the light- As shown in Fig. The image sensor according to claim 1, wherein the motion detector detects a sync signal in the video signal and detects the motion once every predetermined number of frames in the sync signal. The image sensor according to claim 1, wherein the motion detector detects a sync signal in the video signal and switches to a power down mode if the motion is not detected for a predetermined number of frames in the sync signal. 6. The apparatus of claim 5, wherein the motion detection unit selectively activates the emission control signal only in one frame before the motion detection operation is performed and in a frame in which the motion detection operation is performed in the power down mode, Image sensor. An illuminance sensor for sensing brightness information;
A light emitting unit operating corresponding to the level of the brightness information and being turned on or off according to an operation control signal; And
And an image sensor for detecting motion in a video signal applied from a lens, selectively outputting a video output signal according to whether motion is detected, and selectively outputting the motion control signal,
The image sensor
An analog-to-digital converter for signal-processing the brightness information applied from the illuminance sensor;
A control unit for receiving and processing a digital signal and the video signal applied from the analog-to-digital converter;
A motion detector for detecting a motion in an output image of the controller and outputting a power off signal and a light emission control signal;
A digital-to-analog converter for converting an output image of the controller into an analog signal and selectively outputting the image output signal converted into the analog signal according to whether the power-off signal is activated; And
And a light emission control unit for outputting the operation control signal for selectively controlling the turn-on or turn-off operation of the light emitting unit according to the light emission control signal. The image sensor according to claim 7, wherein when the motion is detected, the power off signal is inactivated to output the video output signal, and the light emission control signal is activated to turn on the light emitting unit Shooting device. The image sensor according to claim 7, wherein when the motion is not detected, the power-off signal is activated and the output of the video output signal is interrupted and the light-emission control signal is inactivated to turn off the light- . 8. The image pickup apparatus according to claim 7, wherein the motion detector detects a sync signal in the video signal and detects the motion once every predetermined number of frames in the sync signal. The image sensor according to claim 7, wherein the motion detector detects a sync signal in the video signal and switches to a power down mode if the motion is not detected for a predetermined number of frames in the sync signal . 12. The apparatus of claim 11, wherein the motion detection unit selectively activates the emission control signal only in one frame before the motion detection operation is performed and in a frame in which the motion detection operation is performed in the power down mode, A photographing apparatus comprising an image sensor. The photographing apparatus according to claim 7, further comprising a storage device for storing the image output signal applied from the image sensor unit. 14. The image sensor according to claim 13, wherein the storage device detects a synchronizing signal in the image output signal applied from the image sensor part, and stores the image signal only when the synchronizing signal is detected . The photographing apparatus according to claim 7, wherein the light emitting unit includes an infrared light emitting diode. The photographing apparatus according to claim 7, wherein the light emitting unit includes a light emitting diode.

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