JP2010161736A - Night vision system - Google Patents

Night vision system Download PDF

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Publication number
JP2010161736A
JP2010161736A JP2009003884A JP2009003884A JP2010161736A JP 2010161736 A JP2010161736 A JP 2010161736A JP 2009003884 A JP2009003884 A JP 2009003884A JP 2009003884 A JP2009003884 A JP 2009003884A JP 2010161736 A JP2010161736 A JP 2010161736A
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luminance
target obstacle
night vision
image
unit
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JP2009003884A
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JP5218910B2 (en
Inventor
Yasuo Hagisato
Masayoshi Hiratsuka
Toshiyasu Katsuno
Kunihiko Toyofuku
歳康 勝野
誠良 平塚
安雄 萩里
邦彦 豊福
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Toyota Motor Corp
トヨタ自動車株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a night vision system preventing a driver from feeling botheration of display of an imaged image while displaying the imaged image to allow the driver to easily find a pedestrian or the like in the night. <P>SOLUTION: This night vision system for displaying an image outside a vehicle imaged by an infrared camera includes: the infrared camera for imaging the outside of a vehicle; a detection section for detecting a target obstacle outside the vehicle based on the imaged image of the infrared camera; a luminance adjustment section for adjusting the luminance of the imaged image; and a display for displaying the imaged image at the luminance adjusted by the luminance adjustment section. In the night vision system, the luminance adjustment section can adjust the luminance with a first adjustment pattern; in the first adjustment pattern, the luminance of the screen of the display is adjusted to a first condition before detecting the target obstacle; when the target obstacle is detected, the luminance of a peripheral part of the target obstacle is changed to a second condition high in average luminance relative to that of the first condition; and the average luminance of the peripheral part is set higher than the average luminance of parts other than the peripheral part by the change. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a night vision system, and more specifically, night vision that allows a driver to display a captured image so that the driver can easily find a pedestrian or the like at night, while preventing the driver from feeling annoying the display of the captured image. About the system.

  In recent years, a night vision system has been developed in which a situation outside the vehicle that is difficult to see at night is captured by an infrared camera mounted on the vehicle, and the captured image is displayed on a display unit, so that the driver can be presented with a brightness that makes it easy to see the situation outside the vehicle. It has been proposed (see, for example, Patent Document 1). The display unit of the night vision system is, for example, a head-up display or a display provided in the center console. In the head-up display, an image is projected on a windshield (front glass). The display provided in the center console usually functions as a display for the navigation system.

  By looking at the display part of the night vision system, the driver can recognize the situation outside the vehicle that is difficult to see directly. For example, the display unit of the night vision system brightly displays a pedestrian in an area where the light of the vehicle headlight is not sufficiently irradiated. As a result, the driver can easily find a pedestrian that is difficult to find just by irradiating the light of the headlight, and can prevent a contact accident.

  The visibility of the situation outside the vehicle becomes better as the screen of the display unit is larger and the brightness of the image is higher. On the other hand, the larger the screen and the higher the luminance of the image, the more the driver is distracted by the image and the concentration on driving may be reduced, and the display of the image may be troublesome.

JP 11-243538 A

  The present invention has been made in view of such circumstances, and prevents the driver from feeling annoying the display of the captured image while displaying the captured image so that the driver can easily find a pedestrian or the like at night. The purpose is to provide a night vision system.

The first invention is
A night vision system for displaying an image outside a vehicle captured by an infrared camera,
An infrared camera that images outside the vehicle;
Based on the captured image of the infrared camera, a detection unit that detects a target obstacle outside the vehicle;
A brightness adjusting unit for adjusting the brightness of the captured image;
A display unit that displays the captured image with the luminance adjusted by the luminance adjustment unit,
The luminance adjustment unit can adjust the luminance with a first adjustment pattern. In the first adjustment pattern, the luminance of the screen of the display unit is adjusted to a first state before the target obstacle is detected. When the target obstacle is detected, the luminance of the peripheral portion of the target obstacle is changed to a second state where the average luminance is higher than that of the first state, and the average luminance of the peripheral portion is changed by this change. It is a night vision system characterized in that it is higher than the average brightness of the part other than the peripheral part.

The “target obstacle” in the first invention is not particularly limited, but is, for example, a pedestrian or a person riding a bicycle.
According to the first aspect, before the target obstacle is detected, the luminance of the entire image is suppressed low, and when the target obstacle is detected, the luminance of the image is increased only in the peripheral portion of the target obstacle. The driver can recognize that the target obstacle exists in the area where the luminance is high. Therefore, as soon as the presence of the target obstacle is detected, the driver can recognize the presence of the target obstacle. Further, before and after the target obstacle is detected, the driver is less likely to be distracted by the image, the concentration on driving is not reduced, and the display of the image does not feel troublesome. Therefore, according to the first invention, it is possible to prevent the driver from feeling annoying the display of the captured image while displaying the captured image so that the driver can easily find a pedestrian or the like at night.

According to a second invention, in the first invention,
A frame image generation unit that generates a frame image surrounding the target obstacle in a conspicuous manner;
An image superimposing unit that superimposes the frame image on the captured image;
The display unit displays the image generated by the image superimposing unit.

  According to the second aspect, a conspicuous frame image is displayed on the screen so as to surround the target obstacle. Therefore, according to the second aspect, the driver can more easily find the target obstacle.

  According to a third aspect, in the second aspect, the frame image is displayed in a conspicuous manner.

  According to the third aspect, since the frame image is displayed in a conspicuous manner, the driver can more easily recognize the target obstacle.

According to a fourth invention, in any one of the first to third inventions,
The display width of the peripheral portion is 1/3 or less of the screen width of the display portion.

  According to the fourth invention, since the display width of the peripheral portion of the target obstacle is equal to or less than 1/3 of the screen width of the display portion, the driver can check that the target obstacle is lateral to the traveling lane of the own vehicle. It is possible to easily determine which part of the area exists. For example, the driver can easily determine whether the target obstacle exists on the traveling lane of the own vehicle, on the left side of the traveling lane of the own vehicle or on the right side of the traveling lane of the own vehicle.

According to a fifth invention, in any one of the first to fourth inventions,
The luminance adjustment unit can adjust the luminance with a second adjustment pattern, and the second adjustment pattern controls the luminance of the screen of the display unit both before and after detection of the target obstacle. Adjust to the third state where the average brightness is higher than the state of
The night vision system above
A selection switch for switching the first adjustment pattern and the second adjustment pattern to each other is further provided.

  According to the fifth aspect, when the driver operates the selection switch, the first adjustment pattern and the second adjustment pattern can be switched to each other according to the preference of the driver. As described above, in the first adjustment pattern, the brightness of the entire image is suppressed to a low level before the target obstacle is detected, and when the target obstacle is detected, the brightness of the image is increased only at the periphery of the target obstacle. This is an increasing adjustment pattern. The second adjustment pattern is an adjustment pattern in which the brightness of the entire image is increased both before and after detection of the target obstacle.

A sixth invention is any one of the first to fifth inventions,
The infrared camera is a near infrared camera.

  According to the sixth invention, since the near-infrared camera is used, the manufacturing cost can be reduced as compared with the case where the far-infrared camera is used to detect the heat source.

A seventh invention is the sixth invention, wherein
The projector further includes a projector that projects near-infrared light.

  According to the seventh aspect of the invention, since the projector that projects near-infrared light is provided, it is possible to irradiate an object outside the vehicle with near-infrared light. Thereby, the near-infrared camera can receive more near-infrared light than when not irradiating near-infrared light, and the detection accuracy of the target obstacle can be improved.

According to an eighth invention, in any one of the first to seventh inventions,
The display section is provided in a region where the combination meter is disposed in front of the driver's seat.

  According to the eighth aspect, since the display unit is provided in the arrangement area of the combination meter, the driver can easily view the screen of the display unit.

According to a ninth invention, in any one of the first to eighth inventions,
When the target obstacle is detected, the contour portion of the display section blinks.

  According to the ninth aspect, when the target obstacle is detected, the contour portion of the captured image on the display unit blinks, so that the driver can easily notice the presence of the target obstacle.

  According to the present invention, it is possible to provide a night vision system that can display a captured image so that the driver can easily find a pedestrian or the like at night, while preventing the driver from feeling annoying the display of the captured image. it can.

The block diagram which shows the structure of the night vision system which concerns on 1st Embodiment of this invention. The figure which shows the combination meter provided with the display part in 1st Embodiment of this invention. The figure which shows the state before a target obstacle is detected in the 1st adjustment pattern of image brightness | luminance. The figure which shows a state when a target obstacle is detected in the 1st adjustment pattern of image brightness | luminance. The flowchart which shows operation | movement of the night vision system which concerns on 1st Embodiment. The figure which shows that the intersection guidance information is easy to see in the first adjustment pattern of image luminance The block diagram which shows the structure of the night vision system which concerns on 2nd Embodiment of this invention. The figure which shows the state before a target obstacle is detected in the 2nd adjustment pattern of image luminance. The figure which shows a state when a target obstacle is detected in the 2nd adjustment pattern of image brightness. The flowchart which shows operation | movement of the night vision system which concerns on 2nd Embodiment.

(First embodiment)
A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the night vision system according to the first embodiment. FIG. 2 is a diagram illustrating a combination meter provided with a display unit according to the first embodiment. FIG. 3 is a diagram illustrating a state before a target obstacle is detected in the first adjustment pattern of image luminance. FIG. 4 is a diagram illustrating a state when a target obstacle is detected in the first adjustment pattern of image luminance. FIG. 5 is a flowchart showing the operation of the night vision system.

  The night vision system 1 according to the first embodiment is a night vision system that displays an image outside the vehicle captured by the infrared camera 2.

  As shown in FIG. 1, the night vision system 1 includes an infrared camera 2, a projector 3, a detection unit 4, a brightness adjustment unit 5, a frame image generation unit 6, an image superimposition unit 7, and a display control unit. 13 and a display unit 8. The detection unit 4, the luminance adjustment unit 5, the frame image generation unit 6, the image superimposition unit 7, and the display control unit 13 are provided in an ECU (Electronic Control Unit) 10.

  The infrared camera 2 images outside the vehicle. The infrared camera 2 is a camera that captures an image of the front of the vehicle, for example. In the case of a camera that images the front of the vehicle, the infrared camera 2 is provided, for example, on the front bumper or front grill of the vehicle. Although the kind of infrared camera 2 is not specifically limited, In the example shown by FIG. 1, it is a near-infrared camera. The near-infrared camera can receive near-infrared light emitted from an object or near-infrared light reflected by the object, and image a situation outside the vehicle. Since the near-infrared camera captures an image in the near-infrared region, the situation outside the vehicle can be imaged even when the outside of the vehicle is dark.

  The projector 3 projects near-infrared light into the imaging area of the infrared camera 2. For example, the projector 3 mainly irradiates the outside of the irradiation area of a headlight (not shown). That is, the projector 3 irradiates near infrared light to a region where the headlight light is not sufficiently irradiated. For example, the projector 3 mainly irradiates the front and side of the irradiation area of the headlight. The light projector 3 may irradiate the inside of the irradiation area of the headlight, or may irradiate both inside and outside the irradiation area of the headlight.

  The detection unit 4 detects the target obstacle 9 (see FIG. 2) outside the vehicle based on the captured image of the infrared camera 2. Although the kind of target obstacle 9 is not specifically limited, For example, it is a pedestrian and the person who rides the bicycle.

  The brightness adjusting unit 5 adjusts the brightness of the captured image. The luminance adjusting unit 5 can adjust the luminance with the first adjustment pattern. In the first adjustment pattern, the luminance adjustment unit 5 adjusts the luminance of the image on the display unit 8 to the first state before the target obstacle 9 is detected (see FIG. 3). In the first adjustment pattern, when the target obstacle 9 is detected, the luminance adjustment unit 5 changes the luminance of the peripheral portion 11 of the target obstacle 9 to the second state where the average luminance is higher than that in the first state. With this change, the average luminance of the peripheral portion 11 is made higher than the average luminance of portions other than the peripheral portion 11 (see FIG. 4).

  The frame image generation unit 6 generates a frame image 12 (see FIG. 4) surrounding the target obstacle 9. The frame image generation unit 6 is provided in the ECU 10. The frame image 12 is generated in a conspicuous manner on the display unit 8. The “conspicuous mode” is not particularly limited, and is, for example, higher brightness than the surroundings, conspicuous color, or blinking. The conspicuous colors are, for example, red or yellow meaning warning. The “conspicuous mode” may be any combination of high luminance, conspicuous color, and blinking.

  The image superimposing unit 7 superimposes the frame image 12 on the captured image. Note that when the target obstacle 9 is not detected, the frame image generation unit 6 does not generate the frame image 12, so the image superimposing unit 7 does not superimpose the frame image 12 on the captured image.

  The display control unit 13 causes the display unit 8 to display the image generated by the image superimposing unit 7 (see FIG. 4). When the target obstacle 9 is not detected, the frame image generation unit 6 does not generate the frame image 12, so the display control unit 13 does not display the frame image 12 on the display unit 8 and displays the captured image on the display unit 8. To display. Further, when the target obstacle 9 is detected, the display control unit 13 blinks the contour portion of the imaging screen in the display unit 8 (blinking is not illustrated).

  The display unit 8 displays the image generated by the image superimposing unit 7 (see FIG. 4). When the target obstacle 9 is not detected, the frame image generation unit 6 does not generate the frame image 12, so the display unit 8 displays the frame image 12 on the display unit 8 when displaying the captured image on the display unit 8. Do not show. The display unit 8 displays the captured image with the luminance adjusted by the luminance adjusting unit 5.

  One of the luminance adjustment patterns by the luminance adjustment unit 5 is the first adjustment pattern as described above. When the brightness is adjusted with the first adjustment pattern, the display unit 8 displays the captured image with the screen brightness adjusted to the first state before the target obstacle 9 is detected (FIG. 3). reference). The first state is, for example, a luminance state in which the driver can recognize the travel division line 14 such as a white line on the road surface, and a luminance state in which the driver does not feel annoying the captured image.

  On the other hand, when the target obstacle 9 is detected, the display unit 8 changes the luminance of the peripheral portion 11 of the target obstacle 9 to the second state in which the average luminance is higher than that in the first state (FIGS. 2 and 4). reference). By this change, the average brightness of the peripheral portion 11 becomes higher than the average brightness of the portion other than the peripheral portion 11. The second state is, for example, a luminance state in which the driver can easily recognize not only the travel lane line 14 but also the target obstacle 9 such as a pedestrian. The average brightness in the second state is, for example, 2 to 4 times the average brightness in the first state.

  The display unit 8 displays the frame image 12 in a conspicuous manner (see FIGS. 2 and 4). The “conspicuous mode” is, for example, higher brightness than the surroundings, conspicuous color, and blinking as described above. The conspicuous colors are, for example, red or yellow meaning warning. The “conspicuous mode” may be any combination of high luminance, conspicuous color, and blinking.

  When the target obstacle 9 is detected, the display unit 8 blinks and displays the contour portion of the captured image.

  The display width of the peripheral portion 11 of the target obstacle 9 is not particularly limited, but is, for example, 1/3 or less of the screen width of the display portion 8.

  Although the kind of the display part 8 is not specifically limited, For example, they are a display (refer FIG. 2) provided in the arrangement | positioning area | region of the combination meter 25 ahead of a driver's seat, a head-up display, and the display provided in the center console. In the example shown in FIG. 2, the combination meter 25 includes a tachometer 23, a speedometer 24, and the like in addition to the display (display unit 8). In the head-up display, an image is projected on a windshield (front glass). The display provided in the center console usually functions as a display for the navigation system.

  Next, the operation of the night vision system 1 will be described with reference to the flowchart of FIG.

First, the situation outside the vehicle in front of the vehicle is imaged by light projection by the projector 3 and imaging by the infrared camera 2 (step S1). Next, the luminance adjusting unit 5 adjusts the luminance of the screen to the first state (step S2). The first state is, for example, a luminance state in which the driver can recognize the travel line 14 such as a white line on the road surface, and a luminance state in which the driver does not feel the captured image bothersome (see FIG. 3). Next, the display unit 8 displays the captured image in the first state (step S3). Therefore, the driver does not feel the captured image bothersome.

  Next, the detection unit 4 determines whether or not the target obstacle 9 such as a pedestrian exists in front of the vehicle based on the captured image of the infrared camera 2 (step S4). When it is determined that the target obstacle 9 such as a pedestrian is present, the luminance adjusting unit 5 changes the luminance of the peripheral part 11 of the target obstacle 9 to the second state where the average luminance is higher than the first state. (Step S5). By this change, the average luminance of the peripheral portion 11 becomes higher than the average luminance of portions other than the peripheral portion 11 (see FIG. 4). The second state is, for example, a luminance state in which the driver can recognize not only the travel lane marking 14 but also the target obstacle 9 such as a pedestrian. Since the average luminance of the peripheral part 11 is higher than the average luminance of the part other than the peripheral part 11, the driver has the target obstacle 9 such as a pedestrian and the target obstacle 9 present. The approximate position can be recognized instantly. On the other hand, if it is determined in step S4 that the target obstacle 9 does not exist, the process returns to step S1.

  Next, the frame image generation unit 6 generates a frame image 12 surrounding the target obstacle 9 (step S6). The frame image 12 is generated in a conspicuous manner on the display unit 8. When the frame image 12 is generated, the image superimposing unit 7 superimposes the frame image 12 on the captured image (step S7). Next, the display unit 8 displays an image in which the frame image 12 is superimposed on a captured image in which the average luminance of the peripheral part 11 of the target obstacle 9 is higher than the average luminance of parts other than the peripheral part 11 (step S8). ). Since the average luminance of the peripheral part 11 of the target obstacle 9 is high, the driver can instantly recognize the presence of the target obstacle 9 and the approximate position of the target obstacle 9. In addition, although the average luminance of the peripheral portion 11 of the target obstacle 9 is high, the luminance of portions other than the peripheral portion 11 is kept low, so the driver does not feel the captured image bothersome. Further, since the frame image 12 is displayed so as to surround the target obstacle 9, the driver can instantly recognize the position of the target obstacle 9. When the process of step S8 ends, the process returns to step S1. The above is the operation of the night vision system 1.

  According to the night vision system 1, it is possible to prevent the driver from feeling annoying the display of the captured image while displaying the captured image so that the driver can easily find a pedestrian or the like at night. Moreover, since the brightness | luminance of parts other than the peripheral part 11 is restrained low, when the information which assists a driving | operation is superimposed on a captured image, the said information can be displayed easily. The information for assisting driving is, for example, intersection guidance information in the navigation system (such as an arrow 16 indicating straight travel, right turn, left turn, etc. illustrated in FIG. 6).

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a block diagram showing the configuration of the night vision system according to the second embodiment. FIG. 8 is a diagram illustrating a state before the target obstacle is detected in the second image luminance adjustment pattern. FIG. 9 is a diagram illustrating a state when a target obstacle is detected in the second image luminance adjustment pattern. FIG. 10 is a flowchart showing the operation of the night vision system.

  The second embodiment is different from the first embodiment in that the luminance adjustment unit 15 (see FIG. 7) has a second adjustment pattern in addition to the first adjustment pattern described in the first embodiment. The point is that the night vision system 20 includes a selection switch 22 that switches between the first adjustment pattern and the second adjustment pattern, and other configurations are the same as those of the first embodiment. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The detection unit 4, the brightness adjustment unit 15, the frame image generation unit 6, the image superimposition unit 7, and the display control unit 13 are provided in an ECU (Electronic Control Unit) 17.

  The brightness adjustment unit 15 can adjust the brightness with the first adjustment pattern and the second adjustment pattern. In the second adjustment pattern, the luminance adjustment unit 15 has a higher average luminance than the first state in the first embodiment in the luminance of the screen of the display unit 8 before and after the detection of the target obstacle 9. The third state is adjusted (see FIGS. 8 and 9). When the brightness is adjusted by the second adjustment pattern, the display unit 8 displays the captured image with the screen brightness adjusted to the third state before and after the target obstacle 9 is detected ( (See FIGS. 8 and 9). The third state is, for example, a luminance state in which the driver can recognize not only the travel lane marking 14 but also the target obstacle 9 such as a pedestrian. The third state can be the same luminance state as the second state in the first embodiment. In the second adjustment pattern, a luminance state that allows the driver to easily recognize the target obstacle 9 such as a pedestrian is maintained before and after the detection of the target obstacle 9.

  The selection switch 22 switches between the first adjustment pattern and the second adjustment pattern. The selection switch 22 can be operated by a driver. The driver can select a favorite adjustment pattern from the first adjustment pattern and the second adjustment pattern. The selection switch 22 is provided, for example, in the center console.

  Next, the operation of the night vision system 20 will be described with reference to the flowchart of FIG.

  First, the situation outside the vehicle in front of the vehicle is imaged by the projection of the projector 3 and the imaging of the infrared camera 2 (step S1). Next, based on the signal input from the selection switch 22, it is determined which of the first adjustment pattern and the second adjustment pattern is selected (step S1A). When it is determined in step S1A that the first adjustment pattern has been selected, the processes in steps S2 to S8 are performed as described in the first embodiment.

  On the other hand, when it is determined in step S1A that the second adjustment pattern has been selected, the luminance adjusting unit 15 adjusts the luminance of the screen to the third state (step S9). The third state is, for example, a luminance state in which the driver can easily recognize not only the travel line 14 such as a white line on the road surface but also the target obstacle 9 such as a pedestrian. Next, the display unit 8 displays the captured image in the third state as shown in FIG. 8 (step S10).

  Next, the detection unit 4 determines whether or not the target obstacle 9 such as a pedestrian exists in front of the vehicle based on the captured image of the infrared camera 2 (step S11). When it is determined that the target obstacle 9 such as a pedestrian exists, the frame image generation unit 6 generates a frame image 12 surrounding the target obstacle 9 (step S12). The frame image 12 is generated in a conspicuous manner on the display unit 8. When the frame image 12 is generated, the image superimposing unit 7 superimposes the frame image 12 on the captured image (step S16). Next, as shown in FIG. 9, the display unit 8 displays an image in which the frame image 12 is superimposed on the captured image (step S17). Since the brightness of the screen is high, the driver can easily recognize the presence of the target obstacle 9. Further, since the frame image 12 is displayed so as to surround the target obstacle 9, the driver can instantly recognize the position of the target obstacle 9. When the process of step S17 ends, the process returns to step S1. The above is the operation of the night vision system 20.

  According to the night vision system 20, it is possible to prevent the driver from feeling annoying the display of the captured image while displaying the captured image so that the driver can easily find a pedestrian or the like at night. Further, when the driver operates the selection switch 22, the first adjustment pattern and the second adjustment pattern can be switched to each other according to the preference of the driver.

  The present invention can be used for a night vision system or the like that displays a captured image so that a driver can easily find a pedestrian or the like at night.

DESCRIPTION OF SYMBOLS 1,20 Night vision system 2 Infrared camera 3 Projector 4 Detection part 5, 15 Brightness adjustment part 6 Frame image generation part 7 Image superimposition part 8 Display part 9 Target obstacle (pedestrian etc.)
10 ECU
DESCRIPTION OF SYMBOLS 11 Peripheral part of object obstacle 12 Frame image 13 Display control part 14 Traveling division line 22 Selection switch

Claims (9)

  1. A night vision system for displaying an image outside a vehicle captured by an infrared camera,
    An infrared camera for imaging outside the vehicle;
    Based on the captured image of the infrared camera, a detection unit for detecting a target obstacle outside the vehicle,
    A brightness adjusting unit for adjusting the brightness of the captured image;
    A display unit that displays the captured image with the luminance adjusted by the luminance adjustment unit,
    The luminance adjustment unit can adjust the luminance with a first adjustment pattern. In the first adjustment pattern, the luminance of the screen of the display unit is adjusted to a first state before the target obstacle is detected. When the target obstacle is detected, the luminance of the peripheral portion of the target obstacle is changed to a second state where the average luminance is higher than that of the first state, and the average luminance of the peripheral portion is changed by this change. A night vision system characterized in that it is higher than the average brightness of the parts other than the peripheral part.
  2. A frame image generation unit that generates a frame image surrounding the target obstacle;
    An image superimposing unit that superimposes the frame image on the captured image;
    The night vision system according to claim 1, wherein the display unit displays an image generated by the image superimposing unit.
  3.   The night vision system according to claim 2, wherein the frame image is displayed in a conspicuous manner.
  4.   The night vision system according to any one of claims 1 to 3, wherein a display width of the peripheral portion is 1/3 or less of a screen width of the display portion.
  5. The luminance adjustment unit can adjust the luminance with a second adjustment pattern, and the second adjustment pattern controls the luminance of the screen of the display unit both before and after detection of the target obstacle. Adjust to the third state where the average brightness is higher than the state of
    The night vision system
    5. The night vision system according to claim 1, further comprising a selection switch that switches between the first adjustment pattern and the second adjustment pattern. 6.
  6.   The night vision system according to claim 1, wherein the infrared camera is a near infrared camera.
  7.   The night vision system according to claim 6, further comprising a projector that projects near-infrared light.
  8.   The night vision system according to any one of claims 1 to 7, wherein the display unit is provided in an arrangement area of a combination meter in front of a driver seat.
  9.   The night vision system according to any one of claims 1 to 8, wherein when the target obstacle is detected, a contour portion of a captured image in the display unit blinks.
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