JP2001189926A - Image pickup device for road monitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compact image pickup device for road monitoring, that can simultaneously acquire a visible image and an infrared ray image with less noise. SOLUTION: An image pickup element 2, consisting of the arrangement of intermingled visible light-receiving element 3 and infrared ray light-receiving element 4, receives an image light passing through a window 1 and applies photoelectric conversion to the light, amplifier sections 9a, 9b and correction sections 10a, 10b corresponding to each light-receiving element amplify the electrical signals of the visible light and the infrared ray and correct for the luminance and provided separately outputs of the visible image signal and the infrared ray image signal at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roadside monitoring imaging apparatus which is installed in a gate structure, a vehicle, or the like on a road and monitors the presence or absence of obstacles and the like on the road day and night. .

[0002]

2. Description of the Related Art A conventional apparatus of this type is disclosed, for example, in Japanese Patent Application Laid-Open No. Hei 5-296766 (hereinafter referred to as "publication 1").
There is an obstacle detection device described in US Pat. FIG.
FIG. 701 shows a plurality of lenses and an aperture 702 for forming two images in parallel through a divided path of an image of an object (obstacle). An optical system 703 includes an m × n pixel, such as a CCD, which forms an image of light and converts the light into an electric signal. The image sensor 703 is disposed at a predetermined position with respect to the optical system 701 to operate the camera. Is composed of two obstacle images.
Two images are formed by the optical system 701 that forms images. 7
Reference numeral 04 denotes a sample-hold and CDS circuit for extracting a signal from the image sensor 703, and reference numeral 705 denotes a sample-hold and CD.
An amplifier circuit for amplifying the signal extracted by the S circuit 704; an A / D converter 706 for converting an analog signal amplified by the amplifier circuit 705 into a digital signal;
Reference numeral 07 denotes a DSP circuit for processing an image signal digitally converted by the A / D converter 706, and reference numeral 708 denotes a DSP circuit 7.
A D / A converter that outputs the digital signal processed at 07 as an analog video signal. 709 is an image sensor 7
03, a driver circuit for driving the imaging device 70,
3 is a timing generator (TG) circuit for reading out the charge of each pixel, 711 is a memory circuit for storing digitally processed video signals, and 712 is a DSP circuit 70
A distance measurement calculation circuit including a microcomputer or the like that calculates the distance to the obstacle from the phase difference between the two images processed by the microcomputer 7 outputs the calculated distance measurement information to the collision warning display circuit 713 and the collision warning sound circuit 714. A visible / infrared switching circuit 716 for switching between visible light and infrared light is selectively switched by an external environment detection circuit 717 for detecting an external environment state of the vehicle. Note that the imaging element 703 is divided into two regions, a region where an infrared cut filter is provided and a region where no infrared cut filter is provided.

[0003] The conventional apparatus described in Japanese Patent Laid-Open Publication No. H11-20911 is configured as described above, and forms two images by an optical system 701.
The distance measurement calculation circuit 712 calculates the distance to the obstacle from the phase difference between the two images and outputs a warning. Depending on the environmental conditions such as fog and heavy rain, it is possible to determine whether an image with or without an infrared cut filter is present. Whether to use it for distance calculation is switched.

[0004] As another example of a conventional device of this type,
There is a composite sensor type vehicle sensor described in Japanese Patent Publication No. 2850890 (hereinafter, referred to as Publication 2).
FIG. 8 is a diagram showing a configuration of a composite sensor type vehicle detector described in Japanese Patent Laid-Open Publication No. H08-216, in which reference numeral 810 denotes an imaging unit, and FIG.
Reference numeral 20 denotes an environment measurement unit, and reference numeral 830 denotes a signal processing unit. The imaging unit 810 includes a visible CCD camera 811 and an infrared region imaging camera 812. The environment measurement unit 820
It comprises an illuminometer 821 and a thermometer 822. The signal processing unit 830 includes video A / D converters 831 and 833.
, Frame memories 832 and 834, a digital signal processor (hereinafter referred to as DSP) 835, and C
It includes a PU 836, an external output I / F 837, and A / D converters 838 and 839.

[0005] The conventional apparatus described in Japanese Patent Laid-Open Publication No. H08-209550 is configured as described above, and is provided with a visible CCD camera 811 for receiving only visible light and an infrared imaging camera 812 for receiving only infrared light. In the normal weather, the visible image and the infrared image are simultaneously acquired, and the vehicle detection processing is performed by the DSP 835. In bad weather such as rain or rain and at night, the vehicle detection processing is performed based on the infrared image. .

[0006]

The apparatus according to the prior art is configured as described above. In the prior art described in Japanese Patent Application Laid-Open No. H10-209, two types of images with / without an infrared cut filter are used depending on environmental conditions. There is a problem that it is not possible to obtain both images at the same time because the configuration is such that the images are switched and output. Further, since both visible light and infrared light images are formed on an image sensor of the same material only with or without the infrared cut filter, the noise of the infrared image without the infrared cut filter increases. There was a problem that.

In the prior art described in Japanese Patent Laid-Open Publication No. 2000-209, the camera for visible light and the camera for infrared light are separately provided.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to obtain a compact road surveillance imaging device capable of simultaneously acquiring a visible image and an infrared image with less noise. I have.

[0009]

According to a first aspect of the present invention, there is provided a road surveillance imaging apparatus, comprising: a window for transmitting image light including visible light and infrared light; and a visible light from among the image light passing through the window. A visible light receiving element for receiving only
An image sensor in which an infrared light receiving element for receiving only infrared light is mixedly disposed near both elements, a Peltier for keeping the image sensor at a constant temperature, and temperature control of the image sensor are performed. Temperature control unit, first and second amplifying units provided corresponding to respective light receiving elements for visible light and infrared light for amplifying an electric signal of an image, and an electric signal output by the first amplifying unit And a second correction unit for correcting the luminance of the electric signal output from the second amplification unit, so that the visible image signal and the infrared image signal are separately output. It is what was constituted.

A road surveillance imaging apparatus according to a second aspect of the present invention
The image sensor includes an image sensor that constitutes one screen by alternately arranging one line in the horizontal direction of each of the light receiving elements for visible light and infrared light in the vertical direction.

[0011] A road monitoring imaging apparatus according to a third aspect of the present invention comprises:
The image sensor includes an image sensor that constitutes one screen by alternately arranging one line in the vertical direction of each of the light receiving elements for visible light and infrared light in the horizontal direction.

According to a fourth aspect of the present invention, there is provided a roadside monitoring imaging apparatus,
The image pickup device includes an image pickup device that constitutes one screen by arranging each light receiving element for visible light and infrared light in a checkered pattern.

According to a fifth aspect of the present invention, there is provided a road surveillance imaging device,
A window for passing image light including visible light and infrared light,
A light reflecting portion for reflecting image light passing through the window in two directions, and a visible light comprising one screen element for receiving only visible light from one of the image lights reflected by the light reflecting portion. A light image pickup device, an infrared light image pickup device consisting of one screen element for receiving only infrared light from the other image light, and an infrared light image pickup device at a constant temperature. Peltier to keep, temperature detection unit to detect the temperature of the image sensor of infrared light, Peltier control unit to control Peltier based on this temperature, corresponding to each light receiving element of visible light and infrared light A first and a second amplifying section for amplifying an electric signal of an image, a first correcting section for correcting a luminance of an electric signal output from the first amplifying section, and a second amplifying section. A second correction unit for correcting the luminance of the electric signal to be output, and The issue and infrared image signals is obtained by configured to output separately.

According to a sixth aspect of the present invention, there is provided a roadside monitoring imaging apparatus,
A switching unit for switching and outputting a visible image signal output from the first correction unit and an infrared image signal output from the second correction unit is added.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a diagram showing Embodiment 1 of the first invention. In FIG. 1, reference numeral 1 denotes a window for passing image light including visible light and infrared light emitted from a subject existing on a road, and is made of, for example, a magnesium fluoride material. Reference numeral 2 denotes an image sensor which receives image light passing through the window 1 and outputs an electric signal of the image. The imaging device 2 includes a visible light receiving element 3 for receiving only visible light and performing photoelectric conversion and an infrared light receiving element 4 for receiving only infrared light and performing photoelectric conversion. And output storage units 5a and 5b for temporarily storing and outputting an electric signal of an image corresponding to each of the light receiving elements 3 and 4, respectively.
It is provided with. The imaging device 2 is hermetically sealed together with the window 1 and packaged. 6 is a Peltier for keeping the image sensor 2 at a constant temperature, 7 is a temperature detector for detecting the temperature of the image sensor 2 and outputting a temperature signal, and 8 is an input of this temperature signal to control the Peltier 6. A Peltier control unit 9a is a first amplifying unit for amplifying an electric signal of a visible light image output from an accumulation output unit 5a in the image sensor 2, and 9b is an accumulation output in the image sensor 2. The second amplifier 10a for amplifying the electric signal of the infrared light image output from the unit 5b corrects the luminance of the electric signal output from the first amplifier 9a and outputs a visible image signal. The first correction unit 10b is a second correction unit that corrects the luminance of the electric signal output from the first amplification unit 9b and outputs an infrared image signal.
Is an imaging control unit that controls the driving of the camera. Reference numeral 12 denotes a synchronizing signal generating unit for generating a vertical synchronizing signal having one field cycle, a horizontal synchronizing signal having one horizontal line cycle, a pixel clock having one pixel cycle, and supplying the same to each unit. A superimposing unit 13a superimposes the vertical synchronizing signal and the horizontal synchronizing signal supplied from the synchronizing signal generating unit 12 on the visible image signal output from the correcting unit 10a and outputs the composite image signal to the outside. This is a superimposing unit that superimposes the vertical synchronizing signal and the horizontal synchronizing signal supplied from the signal generating unit 12 on the infrared image signal output from the correcting unit 10b and outputs the composite image signal to the outside. Reference numerals 14a and 14b denote transmission lines for transmitting image signals output from the correction units 10a and 10b, and reference numeral 15 denotes a vertical synchronization signal, a horizontal synchronization signal, and a pixel clock output from the synchronization signal generation unit 12. The lines 16a and 16b are lines for outputting each composite image signal output from the superimposing units 13a and 13b to the outside.

The material of the visible light receiving element 3 is, for example, silicon (Si) generally used as a visible light receiving element, and only visible light having a wavelength of 390 nm to 770 nm is provided on the surface of each element. Is added. On the other hand, the material of the infrared light receiving element 4 is, for example, vanadium oxide (VOx) that easily receives infrared light, and the surface of each element is formed of so-called infrared light having a wavelength of 3 μm to 5 μm or 8 μm to 12 μm. A band pass filter for passing only the limited wavelength band is added. Each element corresponds to one pixel of an image.

As is well known, the infrared image is a so-called temperature image. If the temperature of each element of the infrared light receiving element 4 varies, a difference occurs in the light receiving sensitivity of each element. Will happen. The Peltier 6 is for keeping the infrared light receiving element 4 at a constant temperature such as 40 ° C., for example. On the other hand, since the visible light receiving element 3 also has a slight variation in sensitivity due to temperature, maintaining the visible light receiving element 3 at a constant temperature by the Peltier 6 also reduces noise in the visible image.

Since the electric signal of the image output from each of the accumulation output units 5a and 5b is weak, it is necessary to amplify the signal amplitude. The amplifying units 9a and 9b have a function of performing the amplitude amplification and also performing a so-called sample-and-hold operation to amplify the time axis by the pixel clock, that is, keep the signal level of one pixel section constant.

The correction units 10a and 10b are for correcting the contrast of the entire image.
In addition, there is provided a function of correcting the sensitivity variation of the infrared light receiving element 4.

Next, the operation of image output will be described. All of the visible light receiving element 3 and the infrared light receiving element 4 are:
The image light is always photoelectrically converted to output an electric signal. In synchronization with the vertical synchronizing signal output from the synchronizing signal generating unit 12, the imaging control unit 11 transmits the electric signals of all the pixels to each of the accumulation output units 5a and 5b during a non-image period, that is, within a vertical blanking time. Image sensor 2 to accumulate all at once
Control. The electric signal of the image stored in each of the storage output units 5a and 5b is read out in synchronization with the pixel clock during the next image effective time of the vertical blanking, and is amplified.
signal amplification by a and 9b, correction units 10a and 10b
b, and the superimposing units 13a and 13b perform the respective processes of superimposing the vertical / horizontal synchronization signals, and simultaneously output the visible image signal and the infrared image signal to the outside.

FIG. 2 shows a visible light receiving element 3 according to the second invention.
FIG. 4 is a diagram showing a mixed arrangement of a light receiving element 4 and a light receiving element 4 for infrared light. As shown in the drawing, this arrangement is such that visible light receiving elements 3 for one horizontal line and infrared light receiving elements 4 for one horizontal line are alternately arranged in the vertical direction. This arrangement is an advantageous arrangement in the case where each image of visible light and infrared light requires a resolution in the horizontal direction from the vertical direction, and a resolution in the width direction is required rather than the distance direction of the road, for example, It is suitable for use in installation on a vehicle or the like to perform on-road monitoring such as detection of other vehicles and recognition of on-road objects.

FIG. 3 shows a visible light receiving element 3 according to the third invention.
FIG. 4 is a diagram showing a mixed arrangement of a light receiving element 4 and a light receiving element 4 for infrared light. As shown in the figure, this arrangement is such that visible light receiving elements 3 for one vertical line and infrared light receiving elements 4 for one vertical line are alternately arranged in the horizontal direction. This arrangement is advantageous when both the visible light image and the infrared light image require a resolution in the vertical direction rather than the horizontal direction. It is suitable for use in road monitoring such as measurement of traffic flow and monitoring of abnormally running vehicles by being installed at a high position such as the upper gate structure.

FIG. 4 shows a light receiving element 3 for visible light according to the fourth invention.
FIG. 4 is a diagram showing a mixed arrangement of a light receiving element 4 and a light receiving element 4 for infrared light. As shown in the drawing, this arrangement is such that the light receiving elements 3 for visible light and the light receiving elements 4 for infrared light are arranged in a checkered pattern.
This arrangement is advantageous when both visible and infrared light images require uniform resolution in the horizontal and vertical directions. For example, it is used for recognition processing of license plates of vehicles. Suitable for.

Embodiment 2 FIG. FIG. 5 is a diagram showing Embodiment 2 of the fifth invention. In the drawing, 1, 5a, 5b, 6 to 8, 9a, 9b, 10a, 10b, 11, 12, 13 are shown.
a, 13b, 14a, 14b, 15, 16a and 16
b is the same as that shown in FIG. Reference numeral 17 denotes a light reflecting portion that reflects image light passing through the window 1 in two directions, that is, a direction toward the visible light image sensor 20 described later and a direction toward the infrared light image sensor. For example, it is composed of a prism made of a magnesium fluoride material. Reference numeral 18 denotes a visible light filter for passing only visible light from one of the image lights reflected by the light reflection unit 17, and reference numeral 19 denotes an infrared light from the other image light reflected by the light reflection unit 17. An infrared light filter for passing only light, 20 is a visible light imaging element that receives visible light passing through the visible light filter 18 and outputs an electric signal of an image, and 21 is an infrared light filter 19. It is an infrared light image sensor that receives infrared light that passes and outputs an electric signal of an image. The infrared light image sensor 21 and the visible light image sensor 20 are individually packaged and arranged side by side.

The visible light image pickup device 20 is composed of a device in which visible light receiving devices 30 are arranged for one screen, and an accumulation output unit 5a. The infrared light image pickup device 21 includes an infrared light receiving element 40 arranged for one screen and an accumulation output section 5b. The visible light receiving element 30 is the same as the visible light receiving element 3 of FIG. 1, but in this embodiment, since the visible light filter 18 is separately provided, the visible light bandpass filter is provided on each element surface. It is not necessary to provide. The infrared light receiving element 40 is the same as the infrared light receiving element 4 in FIG. 1, but in this embodiment, since the infrared light filter 19 is provided separately, the infrared light Need not be provided.

The Peltier 6 and the temperature detector 7 are installed at positions where both the visible light image pickup device 20 and the infrared light image pickup device 21 are kept at a constant temperature in order to suppress an increase in noise due to a temperature change.

The operation of image output is the same as that of FIG. 1. The electric signals of visible light and infrared light photoelectrically converted by the light receiving element 30 for visible light and the light receiving element 40 for infrared light are During the vertical blanking time, the data is accumulated in the accumulation output units 5a and 5b for one screen at a time, and is read out in synchronization with the pixel clock at the next image valid time after the vertical blanking. Further, the visible image signal and the infrared image signal are simultaneously output to the outside through the processing of the amplification units 9a and 9b, the correction units 10a and 10b, and the superposition units 13a and 13b.

Embodiment 3 FIG. 6 is a view showing a third embodiment of the sixth invention, in which 14a, 14b and 1
Reference numeral 5 denotes the same line as that shown in FIG. Reference numeral 13c is similar to the superimposing units 13a and 13b in FIG. 1, and superimposes a vertical synchronizing signal and a horizontal synchronizing signal supplied from the synchronizing signal generating unit 12 on an image signal, and outputs the composite image signal to the outside. The superimposing section 16c is similar to the lines 16a and 16b in FIG. 1 and is a line for outputting a composite image signal. A switching unit 22 switches and outputs a visible image signal and an infrared image signal from the correction units 10a and 10b input from the lines 14a and 14b.

As described below, the switching operation of the switching unit 22 is similar to that of FIG.
Although it differs depending on which of the configurations shown in FIGS. 3, 4 and 5 is applied, in any case, there is an advantage that image signals of both visible light and infrared light can be output by one line. .

First, when applied to the configurations of FIGS. 2 and 5, a visible image signal and an infrared image signal are switched and output in synchronization with a vertical synchronizing signal. As is well known, a normal image signal divides one screen into an odd field having only odd lines and an even field having only even lines, and outputs each field alternately. In this case, since the field frequency, that is, the vertical frequency is usually 60 Hz, each image signal of visible light and infrared light is alternately output at 30 Hz.

On the other hand, when applied to the configurations of FIGS. 3 and 4, a visible image signal and an infrared image signal are switched and output in synchronization with a pixel clock. In this case, both the visible light and the infrared light image signals are output at a field frequency of 60 Hz.

[0032]

According to the first aspect of the present invention, dedicated light receiving elements for visible light and infrared light are mixedly arranged in a plane on a single image pickup device, and each of the visible light image and the infrared light image is electrically connected. Since the signals are read and processed independently and simultaneously, the visible image and the infrared image with less noise can be obtained at the same time, and a compact device can be obtained.

According to the second aspect of the present invention, one line of the visible light receiving element and one line of the infrared light receiving element in the horizontal direction are alternately arranged in the vertical direction, so that a sufficient resolution can be obtained in the horizontal direction. is there.

According to the third aspect of the present invention, one line of each of the visible light receiving element and the infrared light receiving element in the vertical direction is alternately arranged in the horizontal direction, so that a sufficient resolution can be obtained in the vertical direction. is there.

According to the fourth aspect, since the visible light receiving element and the infrared light receiving element are arranged in a checkered pattern, there is an effect that the resolution can be obtained with good balance in the horizontal and vertical directions.

According to the fifth aspect of the invention, since the visible light image pickup device and the infrared light image pickup device are provided independently, the visible light receiving device and the infrared light receiving device are combined into one image pickup device. Since there is no need to pack, there is an effect that it is easy to manufacture.

According to the sixth aspect, since the switching section for switching and outputting the visible image signal and the infrared image signal is provided, there is an effect that both image signals can be output by one line.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a road monitoring imaging apparatus according to the present invention;

FIG. 2 is a diagram showing a vertical alternate arrangement of each light receiving element for visible light and infrared light of the roadside monitoring imaging apparatus according to the present invention.

FIG. 3 is a diagram showing a horizontal alternating arrangement of visible light and infrared light receiving elements of the roadside monitoring imaging apparatus according to the present invention;

FIG. 4 is a diagram showing a checkerboard-shaped arrangement of visible light and infrared light receiving elements of the roadside monitoring imaging apparatus according to the present invention;

FIG. 5 is a diagram showing a second embodiment of the road monitoring imaging apparatus according to the present invention;

FIG. 6 is a diagram showing a third embodiment of the road monitoring imaging apparatus according to the present invention;

FIG. 7 is a diagram illustrating a conventional obstacle detection device.

FIG. 8 is a view showing a conventional composite sensor type vehicle sensor.

[Explanation of symbols]

1 window, 2 image sensor, 3, 30 visible light receiver, 4, 40 infrared light receiver, 6 Peltier, 7
Temperature detection unit, 8 Peltier control unit, 9a, 9b amplification unit, 10a, 10b correction unit, 11 imaging control unit, 17
Light reflection unit, 20 visible light imaging device, 21 infrared light imaging device, 22 switching unit.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G08G 1/00 G08G 1/04 C 5H180 1/04 1/16 C 1/16 H04N 5/225 C H04N 5 / 225 Z 5/33 5/33 5/335 Z 5/335 G06F 15/64 320G F term (reference) 2F065 AA02 AA07 BB05 CC11 DD03 DD04 EE01 FF42 GG01 GG21 HH02 JJ03 JJ26 LL21 QQ36 UU02 5B047 AA19 BC03 BB03 BB03 CB03 DA01 5C022 AA01 AA15 AB38 AC42 AC43 AC69 5C024 AX01 AX06 BX04 EX00 EX52 GX21 GX22 HX17 HX50 5C054 AA01 CA04 CA05 CC02 EA01 ED03 FE12 HA18 5H180 AA01 CC02 CC04 CC27 CC30 DD07 EE07 EE11 LL04

Claims (6)

[Claims] 1. A window for passing image light including visible light and infrared light emitted from a subject existing on a road, and a photoelectric conversion device that receives only visible light from the image light passing through the window. A light receiving element for visible light to perform, and a light receiving element for infrared light for receiving only infrared light and performing photoelectric conversion, an imaging element in which a plurality of light receiving elements are arranged near each other and arranged in a plane, A temperature controller for maintaining the image sensor at a constant temperature, a first amplifier for amplifying a visible image electric signal output from the visible light receiving element, and an output from the infrared light receiving element. A second amplifying unit for amplifying an electric signal of an infrared image, a first correcting unit for performing a luminance correction of an electric signal output from the first amplifying unit, and outputting a visible image signal, and The brightness of the electrical signal output by the amplifier of A roadside monitoring imaging apparatus, comprising: a second correction unit that outputs a signal; and an imaging control unit that controls driving of the imaging device. 2. A light-receiving element for visible light and a light-receiving element for infrared light, each for one line in the horizontal direction, are alternately arranged in the vertical direction to form one line.
The roadside monitoring imaging apparatus according to claim 1, further comprising an imaging element constituting a screen portion. 3. A light receiving element for visible light and a light receiving element for infrared light, each for one line in the vertical direction, are alternately arranged in the horizontal direction to form one line.
The roadside monitoring imaging apparatus according to claim 1, further comprising an imaging element that forms a screen text. 4. An on-road monitoring system according to claim 1, further comprising an image pickup device for arranging a visible light receiving element and an infrared light receiving element in a checkered pattern to constitute one screen. Imaging device. 5. A light reflecting portion that divides image light including visible light and infrared light emitted from a subject existing on a road in two directions, and one of the image light reflected by the light reflecting portion. A visible light image sensor consisting of the number of elements for one screen for receiving only visible light and performing photoelectric conversion, and receiving only infrared light from the other image light reflected by the light reflecting portion Detecting the temperature of the infrared light image sensor, and the infrared light image sensor consisting of the number of elements for one screen for performing photoelectric conversion, the Peltier for keeping the infrared light image sensor at a constant temperature, and detecting the temperature of the infrared light image sensor A temperature detector that outputs a temperature signal, a Peltier controller that inputs the temperature signal to control the Peltier, and a first amplifying an electric signal of a visible image output from the visible light imaging device. Of the infrared image output from the infrared light image sensor. A second amplifying unit for amplifying the signal, a first correcting unit for performing a luminance correction on the electric signal output from the first amplifying unit and outputting a visible image signal, and an output from the second amplifying unit A roadside monitoring imaging apparatus, comprising: a second correction unit that performs luminance correction of an electric signal to output an infrared image signal; and an imaging control unit that performs drive control of the first and second imaging elements. 6. A switching unit for switching and outputting between a visible image signal output from a first correction unit and an infrared image signal output from a second correction unit. The roadside monitoring imaging apparatus according to claim 2, 3, 4, or 5.