JP2012039359A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly determine an improper imaging action in an imaging device having a detachable infrared light cutting filter.SOLUTION: When detecting that a filter is at a disengagement position (YES in S1), a microcomputer turns on an infrared light LED lamp (S2), stores an image just before turning off the lamp in a memory at a predetermined timing (S4), thereafter turns off the lamp, stores an image at the turn-off, and switches the image in a finder from the real-time image to the image just before the turn-off stored in the memory (S5). Next, the microcomputer compares luminances of the image just before the turn-off and the image at the turn-off (S6), and when the luminances have no difference (NO in S7) and the both images are not dark (NO in S8), determines that the imaging action is improper to display a blue back image on the finder (S9). When the image just before the turn-off illuminated by the infrared light and the image at the turn-off without illumination by the infrared light have no difference in luminance, the microcomputer determines that the imaging action is improper since an object is at a distance unreachable by the infrared light.

Description

  The present invention relates to an imaging apparatus, and more specifically, includes an imaging device capable of imaging in a visible light region and an infrared light region, and an infrared light cut filter that cuts a wavelength component in the infrared light region is detachable by a user. The present invention relates to an imaging apparatus.

  An imaging element mounted on an imaging apparatus such as a home video camera or a digital camera can usually capture a visible light region and a part of an infrared light region. Using this, an infrared light source such as an infrared LED lamp can be attached to the image pickup device and an infrared light cut filter can be detachably attached to improve the quality of the image taken during daytime shooting. There is known one capable of photographing at dusk or in a dark room (for example, see Patent Document 1).

  In the imaging apparatus as described above, the user inserts an infrared light cut filter into an optical path formed by an optical system such as a lens and a diaphragm during daytime shooting, and the wavelength component of the infrared light region of light coming from the subject. To prevent the image being picked up from being reddish and improve the image quality. In addition, when shooting in a dark room, the infrared light source is turned on to illuminate the subject with infrared light, and both visible light and infrared light coming from the subject are removed from the optical path by removing the infrared light cut filter. Can be picked up by the image sensor, and the image can be brightened.

  However, in the imaging apparatus as described above, the user simply removes the infrared light cut filter from the optical path, and easily allows the wavelength component of the infrared light region to reach the image sensor and captures an image of the infrared light region. Infrared light can be easily transmitted in thin clothing, and improper imaging may be performed using this. For example, if the infrared light cut filter is intentionally removed from the light path outdoors in the daytime when the infrared light is strong, such as in summer, improper imaging such as seeing through a person wearing a swimsuit or thin clothing will be taken. It can be carried out.

  In order to prevent improper imaging as described above, in the imaging apparatus described in Patent Literature 1, the wavelength component in the infrared light region is not cut, and the brightness of the captured image is a predetermined threshold value. Under the above conditions, an erroneous operation is determined, and when it is determined as an erroneous operation, the power is shut off.

  In addition, as a system for preventing so-called hidden shooting as a kind of illegal imaging action in which imaging is performed without being noticed by a person on the subject side, a mechanism for preventing unauthorized imaging is not provided only on the imaging device side. Some people wear a small device to prevent the person side from being subject to unauthorized imaging.

  For example, a person wears a small device having an image for preventing unauthorized imaging, and detection means for detecting that the image information for preventing unauthorized imaging is included in the captured image signal on the imaging device side It is known that a part of the imaging device is turned off when it is detected that image information for preventing unauthorized imaging is included (see, for example, Patent Document 2).

  In addition, the imaging device includes a light source that emits visible light when the release button is pressed halfway, and the subject person has a light receiving unit that generates an alarm sound when receiving visible light from the light source. A system is known in which a subject person is noticed by an alarm sound from a light receiving unit when a release button is pressed in order to perform hidden shooting (see, for example, Patent Document 3).

Japanese Patent No. 4341102 JP 2001-169175 A JP 2006-301418 A

  Compared with the imaging devices described in Patent Documents 2 and 3, the imaging device described in Patent Document 1 does not require a person to wear an apparatus for preventing unauthorized imaging, and the imaging device side is inappropriate alone. It is excellent in that imaging can be determined. However, it is actually difficult for the imaging device to accurately detect an inappropriate imaging action performed by the user alone. For example, when an image is taken in a room with little entry of outside light even in the daytime, an infrared light cut filter may be removed to increase the brightness of the image even at the expense of image quality. In the imaging device described in Patent Literature 1, since only the brightness of the image is used as a criterion, the brightness of the image is set when the user points the imaging device toward a subject in a relatively bright area in the room. If the threshold value is slightly higher than the threshold value, the user's imaging action is determined to be inappropriate even though the camera is used correctly, and imaging cannot be performed.

  On the other hand, there is a situation in which the improper imaging action as described above is performed from a relatively distant place of 5 m or more in order to prevent the person of the subject from being noticed, and the imaging device detects the distance to the subject. When a distance sensor for AF (autofocus) is provided, it is conceivable to add the distance from the subject detected by the distance sensor to the condition for determining inappropriate imaging. However, depending on the type of distance sensor, there may be a limitation that distance detection cannot be performed when the contrast of a dark place or subject is small as in the phase difference method. Further, in order to solve this problem, when a dedicated distance sensor is provided in the imaging apparatus, the manufacturing cost is greatly increased.

  Therefore, the inventor of the present application has found that an infrared light source for illuminating a subject is normally equipped in an imaging apparatus in which an infrared light cut filter is detachable, and that an infrared light from an infrared light source is provided. Focusing on the fact that light usually has a reach of only about 5 m, based on changes in the brightness of the image when the infrared light source is turned on / off without relying on distance detection by the mounted distance sensor He realized that the approximate distance to the subject could be detected and came up with the present invention.

  The present invention solves the above-described problems, and an imaging device capable of imaging in the visible light region and the infrared light region, an infrared light source for illuminating a subject, and an infrared that is detachable by a user operation. In an imaging apparatus including an optical cut filter, an imaging apparatus capable of more correctly determining an improper imaging action with a simple configuration without the need for a major change in the configuration such as newly installing a distance sensor is provided. The purpose is to do.

  In order to solve the above problems, the invention of claim 1 is directed to imaging light in a visible light region and an infrared light region of light received from a subject via an optical path formed by an optical system such as a lens and a diaphragm. An image pickup device capable of performing the above operation, a display unit that displays an image picked up by the image pickup device, a cut position that is inserted into the optical path and cuts a wavelength component in the infrared light region of light by a user operation, In an imaging device comprising: an infrared light cut filter that is switchable between a separation position that leaves a light path and allows light to reach the image sensor as it is; and an infrared light source that illuminates the subject. Filter position detection means for detecting switching of the infrared light cut filter from the cut position to the separation position, and the cut position of the infrared light cut filter by the filter position detection means When the switching to the separation position is detected, the infrared light source lighting means for turning on the infrared light source and the infrared light source turned on by the infrared light source lighting means are temporarily turned off at a predetermined timing. Or an infrared light source control means for reducing the illuminance, an image captured by the image sensor when the infrared light source is turned off or the illuminance is reduced by the infrared light source control means, and an infrared light Compared with the image captured by the image sensor immediately before or after the light source is turned off or the illuminance is reduced, if there is no difference in brightness, or the difference in brightness is more than a predetermined difference amount And an unauthorized operation determining unit that determines that the image capturing operation is an unauthorized image capturing operation when it is small.

  According to a second aspect of the present invention, there is provided an imaging device capable of receiving light arriving from a subject through an optical path formed by an optical system such as a lens and a diaphragm and imaging the visible light region and the infrared light region of the light, A display unit that displays an image captured by the image sensor, a cut position that is inserted into the optical path and cuts the wavelength component of the infrared light region of the light by a user operation, and leaves the optical path as it is. An imaging apparatus comprising: an infrared light cut filter that is switchable between a separation position that reaches the image pickup device; and an infrared light source for illuminating the subject. Filter position detection means for detecting switching from the cut position to the separation position, and switching of the infrared light cut filter from the cut position to the separation position by the filter position detection means When detected, the infrared light source lighting means for turning on the infrared light source and the infrared light source turned on by the infrared light source lighting means are temporarily turned off or the illuminance is reduced at a predetermined timing. Infrared light source control means, an image captured by the imaging device when the infrared light source is turned off or the illuminance is reduced by the infrared light source control means, and the infrared light source is turned off or the illuminance is reduced Compared with an image picked up by the image sensor immediately before or after being put into a state, when there is no difference in brightness, or when the difference in brightness is smaller than a predetermined difference, and both The image processing apparatus includes an unauthorized operation determining unit that determines that the image is an unauthorized imaging operation when both the brightness of the image is such that the contour of the subject can be determined.

  According to a third aspect of the present invention, in the first or second aspect of the invention, when the unauthorized operation determination means determines that the image capturing operation is unauthorized, the display of the image on the display unit is stopped and the display is stopped. The image processing apparatus further includes display stopping means for preventing a user from seeing an image picked up by the image pickup device.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, when the infrared light source control means temporarily turns off the infrared light source or reduces the illuminance. The image displayed on the display unit is replaced with a real-time image captured by the image sensor, and the imaging is performed immediately before the infrared light source control unit temporarily turns off the infrared light source or reduces the illuminance. Display image control means for making an image picked up by the element is further provided.

  According to a fifth aspect of the present invention, in the invention of the fourth aspect, the time for the infrared light source control means to turn off the infrared light source temporarily or to reduce the illuminance is the time for the imaging device to capture one frame. It is equivalent to.

  According to a sixth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the timing when the infrared light source control unit temporarily turns off the infrared light source or reduces the illuminance is random. It is characterized by being.

  According to the first aspect of the present invention, when the infrared light cut filter is switched to the separation position, the infrared light source is turned on to temporarily turn off or reduce the illuminance at a predetermined timing. Compare the image captured when the image is reduced with the image captured immediately before or after it, and if there is no difference in brightness, or the difference in brightness is smaller than the predetermined difference In this case, since it is determined that the image capturing operation is unauthorized, it is possible to determine the unauthorized image capturing operation more accurately with a simple configuration.

  According to the invention of claim 2, when the infrared light cut filter is switched to the separation position, the infrared light source is turned on to temporarily turn off or reduce the illuminance at a predetermined timing. Compare the image captured when the image is reduced with the image captured immediately before or after it, and if there is no difference in brightness, or the difference in brightness is smaller than the predetermined difference If both images are bright enough to discriminate the contour of the subject, it is determined that the image is an illegal imaging operation. It is possible to accurately determine an illegal imaging operation while properly excluding cases where the darkness cannot be determined and there is no substantial problem.

  According to the third aspect of the present invention, when it is determined that the image capturing operation is unauthorized, the display of the image on the display unit is stopped so that the user cannot see the captured image. Can be prevented.

  According to the invention of claim 4, when the infrared light source is temporarily turned off or the illuminance is reduced, the image displayed on the display unit is immediately before the real-time image captured by the image sensor. Since the captured image is replaced, the image displayed on the display unit is not discontinuous, and the user's smooth imaging action is not hindered.

  According to the invention of claim 5, since the time for which the infrared light source is temporarily turned off or the illuminance is reduced is equivalent to the time for the imaging device to take one frame, the image displayed on the display unit Can be easily controlled from the real-time image captured by the image sensor to the image captured immediately before, and the display image on the display unit can be easily prevented from becoming discontinuous.

  According to the invention of claim 6, since the timing at which the infrared light source is temporarily turned off or the illuminance is reduced is random, the user connects an external inspection device to the imaging device and displays the image on the display unit. It is possible to make it difficult to detect that the image on the display unit has been replaced when attempting to inspect.

1 is a block diagram of an imaging apparatus according to an embodiment of the present invention. The flowchart of the procedure for determining unauthorized imaging | photography in the imaging device. (A) is a diagram showing the timing of turning on / off the infrared LED lamp in the imaging apparatus, and (b) shows an image captured by the imaging device when appropriate imaging is performed in the imaging apparatus for each frame. FIG. 3C is a diagram illustrating, for each frame, an image captured by the image sensor when inappropriate imaging is performed in the imaging apparatus.

  Hereinafter, an imaging apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the imaging apparatus 1 according to the present embodiment receives light arriving from a subject 6 via an optical path 5 formed by an optical system including a zoom lens 2, a focus lens 3, and a diaphragm 4 and is visible. An image sensor 7 capable of imaging an optical region and an infrared light region, a signal control circuit 8 that performs gain control and AD conversion of an image signal output from the image sensor 7, and an image signal output from the signal control circuit 8 A signal processing circuit 11 that performs color correction and contour correction and outputs the result to a viewfinder (display unit) 9, and a microcomputer for controlling the operation thereof (infrared light source lighting means, infrared light source control means, unauthorized operation determination means, display) (Stopping means, display image control means) 12 and an infrared LED lamp (infrared light source) 13 for illuminating the subject 6.

  The image sensor 7 is composed of a solid-state image sensor such as a CCD or CMOS image sensor, and outputs the captured image as an image signal to the signal control circuit 8 at a timing of one frame every 1/60 seconds. The microcomputer 12 detects the timing at which the image sensor 7 outputs the image signal frame by frame based on the input signal a from the image sensor 7, and synchronizes with the timing to send the infrared LED lamp 13 via the lamp drive source 14. Can be turned on and off.

  Further, the microcomputer 12 stores an image output from the signal processing circuit 11 as a still image or a moving image when the user gives a recording instruction by pressing the operation button 15 and at a later-described timing generated by the microcomputer 12. 16 is recorded. The microcomputer 12 switches the input to the viewfinder 9 by switching the switch 10, and the image displayed on the viewfinder 9 is recorded in the memory 16 from the real-time image output from the signal processing circuit 11. You can temporarily switch to an image.

  An infrared light cut filter 17 is disposed between the zoom lens 2 and the diaphragm 4. The infrared light cut filter 17 is inserted into the optical path 5 by a user's operation and cuts off the wavelength component in the infrared light region of the light from the subject 6 (shown by a solid line), and leaves the optical path 5 downward. Thus, it is possible to switch between a separation position (two-dot chain line shown) where the light reaches the image sensor 7 as it is.

  Specifically, the side portion of the infrared light cut filter 17 is slidably supported in the vertical direction by a rail (not shown), and when switching the position, the user holds the knob portion 17a of the infrared light cut filter 17 and moves up and down. Do by moving to. Note that the configuration that enables the position of the infrared light cut filter 17 to be switched is not limited to the above, and various configurations such as a configuration in which the infrared light cut filter 17 is fixed to the tip of a lever that swings up and down are possible. Is possible.

  A switch that is turned on when the lower end of the filter 17 comes into contact with the lower part of the infrared light cut filter 17 that is moved downward as described above. (Filter position detecting means) 18 is provided. The microcomputer 12 receives the ON signal b from the switch 18 to detect the switching of the infrared light cut filter 17 to the separation position.

  When the infrared light cut filter 17 is in the cut position, the wavelength component in the infrared light region of the light is cut, so that only the wavelength component in the visible light region reaches the image sensor 7 and is in a bright place. The image of the subject 6 is clearly captured with a natural color tone. When the infrared light cut filter 17 is at the separation position, the wavelength components in both the visible light region and the infrared light region reach the image sensor 7 as light having a large amount of light. The image of the subject 6 in the image can be picked up as a relatively bright image although the image quality is slightly lowered due to redness.

  In addition, when the infrared light LED lamp 13 is turned on to illuminate the subject 6 when the infrared light cut filter 17 is in the detached position, the subject 6 is within the range where infrared light can reach (usually within 5 m). Since the infrared light reflected from the subject 6 can be imaged, the subject 6 can be imaged even in the dark night. The captured image in this case is dark enough to confirm the outer shape of the subject 6.

  Next, a procedure for determining an unauthorized imaging action executed by the microcomputer 12 will be described with reference to the flowchart of FIG. When the microcomputer 12 receives the ON signal b from the switch 18, it detects that the infrared light cut filter 17 has been switched to the detached position (YES in S1), and turns on the infrared LED lamp 13 (S2). At this time, if the distance between the subject 6 and the imaging device 1 is within about 5 m, the infrared light from the infrared LED lamp 13 reaches the subject 6 and is reflected, and the reflected infrared light together with visible light. An image is picked up by the image sensor 7. If the distance between the subject 6 and the imaging device 1 is about 5 m or more, the infrared light from the infrared LED lamp 13 does not reach the subject 6, and the captured image is an image when the infrared light reaches the subject 6. It becomes darker than.

  Subsequently, when the microcomputer 12 reaches a predetermined extinction timing (YES in S3), the microcomputer 12 stores the image immediately before the extinction output from the signal processing circuit 11 in the memory 16 (S4), and the infrared light. The LED lamp 13 is extinguished for a time (1/60 seconds) equivalent to the imaging time for one frame. Further, the image picked up by the image pickup device 7 when the light is turned off is stored in the memory 16 and the input to the viewfinder 9 is switched so that the real-time image displayed on the viewfinder 9 is displayed in the memory 16 in S4. Is replaced with the image immediately before extinguishing and stored (S5).

  The turn-off timing may be every fixed time interval (for example, every 1/10 second) after turning on, or may be a random time interval based on a random number stored in advance in the ROM 12a in the microcomputer 12. Good. Specifically, for example, the microcomputer 12 controls the lighting time to be random, such as 1/20 seconds, 1/15 seconds, 1/30 seconds, 1/45 seconds,.

  Note that the image displayed on the viewfinder 9 is displayed on the viewfinder 9 because the real-time image is replaced with the image stored in the memory 16 for a time equivalent to the time when the image sensor 7 captures one frame. It is easy to perform input switching control so that the image does not become discontinuous. Therefore, the user does not notice that the image of the viewfinder 9 has been replaced, does not feel unnaturalness, and does not hinder normal imaging action. Even if the user feels unnaturalness in the image of the viewfinder 9 and tries to inspect the image displayed on the viewfinder 9 by connecting the inspection apparatus to the imaging apparatus 1, the switching timing may be random. Thus, it can be difficult to detect that the image of the viewfinder 9 has been switched.

  Next, the microcomputer 12 stores the image immediately before turning off the infrared LED lamp 13 stored in the memory 16 in S4 (hereinafter referred to as the immediately preceding image) and the infrared LED lamp 13 stored in the memory 16 in S5. An image when turned off (hereinafter referred to as an image when turned off) is compared (S6). If there is a difference in brightness between the immediately preceding image and the unlit image as a result of the comparison (YES in S7), it is an appropriate imaging action, so the process returns to S3 and waits for the next turn-off timing. If there is no difference in brightness between the two images (NO in S7), it is determined whether or not both images are dark (S8). Except when both images are dark (when both are bright) (NO in S8), it is determined that the image capturing operation is inappropriate, a predetermined signal is output from the signal processing circuit 11, and the blue background image is output to the viewfinder 9. Is displayed (S9). As a result, the user cannot see the image, and as a result, inappropriate imaging can be prevented. Here, “bright” means that the contour of the subject 6 is bright enough to be distinguished.

  The determination process of S7 and S8 will be described with reference to FIG. FIG. 3 shows images taken by the imaging element 7 immediately before and after the period 20 when the infrared LED lamp 13 is turned off one frame at a time. FIG. 3B shows an appropriate imaging action. In the case of FIG. 3, FIG. 3C shows the case of improper imaging action (high possibility of voyeurism). Now, when the subject 6 is within about 5 m, the infrared light reaches the subject 6 and the imaging device 7 images the reflected infrared light together with the visible light. Therefore, as shown in FIG. The immediately preceding image 21a is brighter than the unlit image 21b. In other words, there is a difference in brightness between the images 21a and 21b. From this, when there is a difference in brightness between the images 21a and 21b, the subject 6 is within about 5 m, and it can be determined that it is not an improper imaging action.

  In addition, when the subject 6 is at a distance of about 5 m or more, the infrared light does not reach the subject 6, so there is no difference in the amount of light received by the image sensor 7 regardless of whether the infrared LED lamp 13 is turned on or off. As shown in FIG. 3C, there is no difference in brightness between the immediately preceding image 22a and the unlit image 22b. From this, when there is no difference in brightness between the two images 22a and 22b, it is estimated that the subject 6 is at a distance of 5 m or more and is an inappropriate imaging action.

  Further, when there is no difference in brightness between the images 22a and 22b and the image 6 is so dark that the contour of the subject 6 cannot be discriminated (YES in S8), the distance to the subject 6 is estimated to be 5 m or more. However, since the amount of light in the visible light region is small and there is not enough brightness to determine the contour of the subject 6, etc., it is determined that this is not an improper imaging action. Specifically, for example, when a user takes a night scene while extending the exposure time with the infrared light cut filter 17 removed. When there is no difference in brightness between the images 22a and 22b and both are dark as described above (YES in S8), it is determined that the imaging action is inappropriate, and a blue background image is displayed on the viewfinder 9. You may let them.

  Actually, when comparing the brightness of the immediately preceding images 21a and 22a with the unlit images 21b and 22b, a predetermined width is provided, and the difference in brightness between the two images is smaller than the predetermined difference amount. When there is no difference in brightness, it is determined that there is a difference in brightness when it is large. In addition, instead of the immediately preceding images 21a and 22a, the images whose brightness is compared are the images 21c and 22c (hereinafter referred to as the immediately following images) immediately after the extinguishing period 20 of the infrared light LED lamp 13 ends, and the immediately following images. 21c and 22c may be compared with the unlit images 21b and 22b. In this case, the process of S4 for storing the image of the image sensor 7 in the memory 16 proceeds after S5. Further, the infrared LED lamp 13 may be in a state where the illuminance is reduced without being turned off.

  As described above, according to the imaging device 1 of the present invention, when the infrared light cut filter 17 is switched to the detached position by the user, the infrared LED lamp 13 is turned on, and then temporarily at a predetermined timing. When the light is turned off or the illuminance is reduced, and the light is turned off or the illuminance is reduced, the images captured by the image sensor 7 (the unlit images 21b and 22b) and the images captured immediately before or immediately after (The immediately preceding images 21a and 22a or the immediately following images 21c and 22c) are compared, and if there is no difference in brightness, it is determined that the image is improperly picked up. However, it is possible to determine an unauthorized imaging operation more accurately while having a simple configuration.

DESCRIPTION OF SYMBOLS 1 Image pick-up device 2 Zoom lens 3 Focus lens 4 Aperture 5 Optical path 6 Subject 7 Image sensor 9 Viewfinder (display part)
12 Microcomputer (infrared light source lighting means, infrared light source control means, unauthorized operation determination means, display stop means, display image control means)
13 Infrared LED lamp (infrared light source)
17 Infrared light cut filter 18 Switch (filter position detecting means)
20 Light-off time 21a, 22a Image 21b, 22b immediately before light-off Image when light-off

Claims (6)

An imaging device capable of receiving light arriving from a subject through an optical path formed by an optical system such as a lens and a diaphragm and imaging the visible light region and the infrared light region of the light;
A display unit for displaying an image captured by the image sensor;
Switchable by a user operation between a cut position that is inserted into the optical path and cuts the wavelength component in the infrared region of the light, and a separation position that leaves the optical path and allows the light to reach the image sensor as it is. An infrared light cut filter,
In an imaging device comprising an infrared light source for illuminating the subject,
Filter position detecting means for detecting switching of the infrared light cut filter from the cut position to the separation position;
Infrared light source lighting means for turning on the infrared light source when switching from the cut position of the infrared light cut filter to the separation position is detected by the filter position detection means;
An infrared light source control means for temporarily turning off the infrared light source turned on by the infrared light source lighting means at a predetermined timing or reducing the illuminance;
The image captured by the imaging device when the infrared light source is turned off or the illuminance is reduced by the infrared light source control means, and immediately before the infrared light source is turned off or the illuminance is reduced, or Immediate operation immediately after comparing with the image picked up by the image sensor and determining that the image is an unauthorized image operation when there is no difference in brightness or when the difference in brightness is smaller than a predetermined difference amount An imaging device comprising: a determination unit. An imaging device capable of receiving light arriving from a subject through an optical path formed by an optical system such as a lens and a diaphragm and imaging the visible light region and the infrared light region of the light;
A display unit for displaying an image captured by the image sensor;
Switchable by a user operation between a cut position that is inserted into the optical path and cuts the wavelength component in the infrared region of the light, and a separation position that leaves the optical path and allows the light to reach the image sensor as it is. An infrared light cut filter,
In an imaging device comprising an infrared light source for illuminating the subject,
Filter position detecting means for detecting switching of the infrared light cut filter from the cut position to the separation position;
Infrared light source lighting means for turning on the infrared light source when switching from the cut position of the infrared light cut filter to the separation position is detected by the filter position detection means;
An infrared light source control means for temporarily turning off the infrared light source turned on by the infrared light source lighting means at a predetermined timing or reducing the illuminance;
The image captured by the imaging device when the infrared light source is turned off or the illuminance is reduced by the infrared light source control means, and immediately before the infrared light source is turned off or the illuminance is reduced, or Immediately after comparison with the image picked up by the image pickup device, when there is no difference in brightness, or when the difference in brightness is smaller than a predetermined difference amount, both the brightness of both images is the subject. An imaging apparatus comprising: an unauthorized operation determining unit that determines that the image is an unauthorized imaging operation when the brightness is such that the contour of the image can be determined.   Display that stops displaying an image on the display unit so that a user cannot view an image captured by the image sensor when the unauthorized operation determination unit determines that the image is an unauthorized imaging operation. The imaging apparatus according to claim 1, further comprising a stopping unit.   When the infrared light source control means temporarily turns off the infrared light source or reduces the illuminance, the image displayed on the display unit is replaced with a real-time image captured by the image sensor, The display apparatus according to claim 1, further comprising display image control means for making the image picked up by the image pickup device immediately before the infrared light source control means turns off the infrared light source temporarily or reduces the illuminance. The imaging device according to any one of claims 1 to 3.   The time for the infrared light source control means to turn off the infrared light source temporarily or to reduce the illuminance is equivalent to the time for the imaging device to capture one frame. Imaging device.   5. The imaging apparatus according to claim 1, wherein the infrared light source control unit randomly turns off the infrared light source or causes the illuminance to decrease. 5. .

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