JP2002074346A - Three-dimensional image inputting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a sharp two-dimensional image and a three-dimensional image requiring high-speed driving of an imaging device with respect to a single subject. SOLUTION: As the imaging device, a CCD 28 for the two-dimensional image and a CCD 29 for the three-dimensional image are provided. A multi-pixel CCD is used for the CCD 28. A CCD whose number of pixels is equal to or smaller than the CCD 28 to have a pixel pitch being integral multiple of that of the CCD 28 is used for the CCD 29. Light having entered through a photographic lens 11 is split by a prism P. The split light is photodetected respectively by the CCD 28 and the CCD 29 to detect the two-dimensional image being an ordinary still image and the three-dimensional image corresponding to a distance to the subject.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional image input device for detecting a three-dimensional shape of a subject by using a light propagation time measuring method.

[0002]

2. Description of the Related Art Conventionally, a three-dimensional image input device for irradiating a subject with pulse-modulated laser light, receiving reflected light from the subject at a CCD, and detecting signal charges corresponding to the distance to the subject for each pixel. It has been known. That is, in the three-dimensional image detected by such a three-dimensional image input device, each pixel value of the CCD corresponds to the distance to the subject.

Normally, the three-dimensional image is detected together with a two-dimensional image which is a normal image representing the texture of a subject. For detecting a two-dimensional image, it is desirable to use a high-resolution CCD in order to obtain clearer image quality. On the other hand, when a high-resolution multi-pixel CCD is used, the stray capacitance increases,
High-speed driving becomes difficult. Therefore, a multi-pixel CC is required for detecting a three-dimensional image that needs to drive and control the CCD at high speed.
It is difficult to use D.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is necessary to detect a high-definition two-dimensional image of a subject and to drive a CCD at high speed.
An object is to obtain a three-dimensional image input device capable of detecting a three-dimensional image.

[0005]

A three-dimensional image input device according to the present invention detects first and second image sensors and an optical image of a subject on the first image sensor to detect a two-dimensional image of the subject. A first image detection unit, and a second image detection unit that receives light reflected by the subject by irradiating the subject with ranging light, and receives the reflected light by the second image sensor, and detects a three-dimensional image of the subject according to the amount of received light. Means, the pixel pitch of the second image sensor is the same as the pixel pitch of the first image sensor, or
The pixel pitch is larger than the pixel pitch of the first image sensor.

Preferably, a pixel pitch of the second image sensor is an integral multiple of a pixel pitch of the first image sensor.

[0007] For example, it has one photographing lens and an incident light dividing member for decomposing light incident on the photographing lens, and the first image detecting means and the second image detecting means are divided by the incident light dividing member. Is received to detect an image.

For example, the camera has first and second photographing lenses, a first image detecting means detects a two-dimensional image of a subject via the first photographing lens, and a second image detecting means detects the two-dimensional image via the second photographing lens. To detect a three-dimensional image of the subject.

Preferably, the first image detecting means has a first optical filter, and the second image detecting means has a second optical filter.

For example, the first optical filter is an infrared cut filter, and the second optical filter is an infrared transmission filter.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a camera provided with a three-dimensional image input device according to an embodiment of the present invention.

On the front of the camera body 10, a finder window 12 is provided at the upper left of the taking lens 11, and a flash 13 is provided at the upper right. A light emitting device (light source) 14 for irradiating a laser beam, which is a distance measuring light, is provided on the upper surface of the camera body 10 and directly above the taking lens 11. A release switch 15 and a liquid crystal display panel 16 are provided on the left side of the light emitting device 14, and a mode switching dial 17 and a V / D mode switching switch 18 are provided on the right side. A card insertion slot 19 for inserting a recording medium such as an IC memory card is formed on a side surface of the camera body 10, and a video output terminal 20 and an interface connector 21 are provided.

FIG. 2 is a block diagram showing a circuit configuration of the camera shown in FIG. An aperture 25 is provided in the taking lens 11. The opening of the aperture 25 is determined by the iris drive circuit 2.
Adjusted by 6. The focus adjustment operation and the zooming operation of the photographing lens 11 are controlled by the lens drive circuit 27.

A prism P is provided on the optical axis of the taking lens 11. The prism P is configured to transmit half of the light incident from the photographing lens 11, reflect half of the light, and emit the reflected light from another surface. The light split into two by the prism P passes through the optical filters 22a and 22b, and is a two-dimensional image C for detecting a normal image.
The light enters a CD 28 and a three-dimensional image CCD 29 for detecting distance information indicating the three-dimensional shape of the subject. The incident light is a CCD 28 for two-dimensional images and a CC for three-dimensional images.
The photoelectric conversion is performed in each photodiode of D29, and a signal charge corresponding to the amount of received light is generated for each photodiode.

2D image CCD 28, 3D image C
Operations such as a charge accumulation operation and a charge read operation in the CD 29 are controlled by the CCD drive circuit 30. The charge signal read from the two-dimensional image CCD 28, that is, the image signal, is amplified by the amplifier 31a, and is converted from an analog signal to a digital signal by the A / D converter 32a. The digital image signal is subjected to processing such as gamma correction in a two-dimensional image pickup signal processing circuit 33a,
It is temporarily stored in the three-dimensional image memory 34a. Similarly,
The charge signal read from the three-dimensional image CCD 29, that is, the charge signal of the distance information is supplied to the three-dimensional image pickup signal processing circuit 33b via the amplifier 31b and the A / D converter 32b.
And stored temporarily in the three-dimensional image memory 34b.

Iris drive circuit 26, lens drive circuit 2
7. The CCD drive circuit 30, the two-dimensional image pickup signal processing circuit 33a, and the three-dimensional image pickup signal processing circuit 33b are controlled by the system control circuit 35.

The image signal is read from the two-dimensional image memory 34a and supplied to the LCD drive circuit 36. The LCD drive circuit 36 operates according to the image signal, whereby an image corresponding to the image signal is displayed on the image display LCD panel 37.

The charge signal of the distance information is read from the three-dimensional image memory 34b, supplied to the LCD driving circuit 36, and displayed on the screen display LCD panel 37 as a three-dimensional image.

Further, the image signal read from the image memories 34a and 34b and the charge signal of the distance information are sent to a TV signal encoder 38, and the video signal is output to a monitor provided outside the camera body 10 via the video output terminal 20. Device 39
Can be transmitted. The system control circuit 35 is connected to the interface circuit 40, and the interface circuit 40 is connected to the interface connector 21. Therefore, the image signal read from the image memories 34a and 34b and the charge signal of the distance information are:
The data can be transmitted to a computer 41 connected to the interface connector 21. The system control circuit 35 is connected to the image recording device 43 via the recording medium control circuit 42. Therefore, the read image signal and the charge signal of the distance information can be recorded on a recording medium M such as an IC memory card mounted on the image recording device 43.

A light emitting element control circuit 44 is connected to the system control circuit 35. The light emitting device 14 is provided with a light emitting element 14a and an illumination lens 14b, and the light emitting operation of the light emitting element 14a is controlled by a light emitting element control circuit 44. The light emitting element 14a irradiates a laser beam that is distance measuring light, and this laser beam is radiated to an object to be measured via an illumination lens 14b. The light reflected on the object to be measured enters the photographing lens 11. This light is transferred to the CCD
As a result of the detection by 29, a three-dimensional image of the measured object is measured.

The system control circuit 35 is connected to a switch group 45 composed of a release switch 15, a mode changeover switch 17, and a V / D mode changeover switch 18, and a liquid crystal display panel (display element) 16.

Next, the principle of distance measurement in the present embodiment will be described with reference to FIGS. FIG. 4
, The horizontal axis is time t.

The distance measuring light output from the distance measuring device B is reflected by the subject S and received by a CCD (not shown). The distance measuring light is a pulsed light having a predetermined pulse width H, and therefore, the reflected light from the subject S is also a pulsed light having the same pulse width H. The rise of the reflected light pulse is delayed by a time δ · t (δ is a delay coefficient) from the rise of the distance measurement light pulse. Since the distance measuring light and the reflected light have traveled twice the distance r between the distance measuring device B and the subject S, the distance r is r = δ · t · C /
2 obtained. Where C is the speed of light.

For example, a state in which reflected light can be detected from the rise of the distance measuring light pulse is determined, and the state is switched to an undetectable state before the reflected light pulse falls, that is, a reflected light detection period T is provided. And the received light amount A during the reflected light detection period T is a function of the distance r. That is, the light receiving amount A decreases as the distance r increases (the time δ · t increases).

In this embodiment, utilizing the above-described principle,
Each of the plurality of photodiodes provided in the three-dimensional image CCD 29 and arranged two-dimensionally receives the light receiving amount A
, The distance from the camera body 10 to each point on the surface of the subject S is detected, and 3
Data of a three-dimensional image indicating a three-dimensional shape is input collectively.

Next, the operation of detecting a two-dimensional image and a three-dimensional image according to the present embodiment will be described with reference to the flowcharts of FIGS.

If it is confirmed in step 101 that the release switch 15 is fully depressed, step 1 is executed.
02 is performed, and it is determined whether the video mode (V) or the distance measurement mode (D) is selected. Switching between these modes is performed by operating the V / D mode switch 18.

When the D mode is selected, in step 103, a vertical synchronizing signal is output, and distance measuring light control is started. That is, the light emitting device 14 is driven, and pulsed ranging light is output intermittently. Next, step 104 is executed, and the detection control by the three-dimensional image CCD 29 is started. That is, the distance information detection operation is started, the charge sweeping signal and the charge transfer signal are output alternately, and the signal charge of the distance information is integrated in the vertical transfer unit.

In step 105, it is determined whether one field period has elapsed from the start of the distance information detection operation. When the one-field period ends, the process proceeds to step 106, where the signal charge of the distance information is output from the three-dimensional image CCD 29. This signal charge is temporarily stored in the three-dimensional image memory 34b in step 107. In step 108, the ranging light control is switched to the off state, and the light emitting operation of the light emitting device 14 is stopped.

In steps 109 to 112, an operation of detecting distance correction information is performed. First, at step 109, a vertical synchronizing signal is output and the CCD 29 for three-dimensional images is output.
Is started. That is, the light emission operation of the light emitting device 14 is not performed, and the charge sweeping signal and the charge transfer signal are output alternately with the light source turned off. Although the charge accumulation time is the same as the distance information detecting operation, since the object to be measured is not irradiated with the distance measuring light, there is no reflected light, and therefore no signal charge of the distance information is generated. Is input with a disturbance component such as external light, and a signal charge corresponding to the disturbance component is generated. This signal charge corresponds to distance correction information for the charge accumulation time for correcting the influence of the disturbance component on the distance information.

In step 110, it is determined whether one field period has elapsed from the start of the operation of detecting the distance correction information, that is, whether a new vertical synchronizing signal has been output. When one field period ends, in step 111, the signal charge of the distance correction information is temporarily stored in the three-dimensional image memory 34b in step 112.

In steps 113 to 117, an operation of detecting reflectance information is performed. In step 113, the vertical synchronizing signal is output and the ranging light control is started, and pulse-like ranging light is output intermittently. In step 114, the detection control by the three-dimensional image CCD 29 is started, and the charge discharge signal and the charge transfer signal are output alternately. The operation of detecting the reflectance information is controlled so that all of the reflected light is received within the charge accumulation time from when the charge sweep signal is output to when the charge transfer signal is output. That is, the pulse width of the signal charge stored in each photodiode of the three-dimensional image CCD 29 is the same as the pulse width of the distance measuring light.

Therefore, the signal charge has no relation to the distance to the object to be measured, and corresponds to reflectance information that depends on the reflectance of the surface of the object to be measured.

In step 115, it is determined whether one field period has elapsed from the start of the reflectance information detection operation, that is, whether a new vertical synchronizing signal has been output. When one field period ends, the routine proceeds to step 116, where the signal charge of the reflectance information is output from the three-dimensional image CCD 29. This signal charge is temporarily stored in the three-dimensional image memory 34b in step 117. In step 118, the distance measurement control is switched to the off state, and the light emitting operation of the light emitting device 14 is stopped.

In steps 119 to 122, the operation of detecting the reflectance correction information is performed. In step 119, the vertical synchronizing signal is output and the CCD 29 for the three-dimensional image is output.
Detection control is started. That is, the light emission operation of the light emitting device 14 is not performed, and the charge sweeping signal and the charge transfer signal are output alternately with the light source turned off. The charge accumulation time is the same as that of the reflectance information detection operation. However, since the object to be measured is not irradiated with the ranging light, there is no reflected light, and thus no signal charge of the reflectance information is generated. Signal charges corresponding to disturbance components such as external light are generated in the CCD 29 for use. This signal charge corresponds to reflectance correction information for correcting the influence of the disturbance component on the reflectance information within the charge accumulation time.

In step 120, it is determined whether or not one field period has elapsed since the start of the operation of detecting the reflectance correction information.
That is, it is determined whether a new vertical synchronization signal has been output. When one field period ends, step 121 is performed.
, The signal charge of the reflectance correction information is C
The data is output from the CD 29 and temporarily stored in the three-dimensional image memory 34b in step 122.

In steps 123 to 124, a two-dimensional image detection operation is performed. In step 123, the normal photographing operation (CCD video control) by the two-dimensional image CCD 28 is set to the ON state.
The charge signal of the two-dimensional image, that is, the image signal is temporarily stored in the two-dimensional image memory 34a.

In step 125, steps 103-1
Using the distance information, the distance correction information, the reflectance information, and the reflectance correction information obtained in step S22, the arithmetic processing of the distance measurement (D) data is performed. In step S126, the D data is output, and the detection operation ends. I do. On the other hand, when it is determined in step 102 that the V mode has been selected, the distance measuring light control is switched to the off state in step 127, and the normal photographing operation by the two-dimensional image CCD 28 is set to the on state in step 128. , This detection operation ends.

Next, referring to FIG. 7, a two-dimensional image CCD 28 and a three-dimensional image CCD 28 used in this embodiment will be described.
The CD 29 will be described. In the apparatus of the present embodiment, two CCDs 28 and 29 are provided. Each CC
D is a two-dimensional image CC for detecting a two-dimensional image of a subject.
D28 and a three-dimensional image CCD 29 for detecting a three-dimensional image of the subject based on the principle of the distance measurement described above.

In general, a two-dimensional image is desirably a clear image, and its detection requires the use of a high-resolution CCD having a large number of pixels. Therefore, in this embodiment, a CCD having a large number of pixels and a small pixel pitch is used as the two-dimensional image CCD 28.

On the other hand, detection of a three-dimensional image requires high-speed integration of signal charges over one field period. However, the CCD 29 with a large number of pixels is
When a CD is used, the stray capacitance in the CCD circuit increases, so that the driving speed of the CCD decreases, and high-speed driving for detecting a three-dimensional image cannot be performed. In general, data forming a three-dimensional image does not require fine data as in a two-dimensional image. Therefore, in the present embodiment, the two-dimensional image CCD 28 is
In comparison with the CCD, a CCD having a relatively small number of pixels and a large pixel pitch is used.

That is, in the present embodiment, the CCD 28 used for detecting a two-dimensional image and the CCD 29 used for detecting a three-dimensional image are compared.
There is a relationship of A ≧ B between the pixel pitch A of the CD 29 and the pixel pitch B of the two-dimensional image CCD 28.

By synthesizing a three-dimensional image displaying the distance to the subject and a two-dimensional image displaying the texture of the subject, the subject can be three-dimensionally expressed. In order to perform this combination, it is necessary to perform pixel matching for associating pixels between two images. In the present embodiment, the pixel pitch of the three-dimensional image CCD 29 is 2 in order to enable easy and high-speed pixel alignment.
It is set to be an integral multiple of the pixel pitch of the two-dimensional image CCD. That is, the CC for the two-dimensional image
A = α × B (α is an integer of 1 or more) between the pixel pitch A of D28 and the pixel pitch B of the three-dimensional image CCD 29.
The number of pixels of the two-dimensional image CCD 28 corresponding to one pixel of the three-dimensional image CCD 29 is exactly an integral multiple.

If the pixel pitch of each CCD is not a multiple of an integer, one pixel of the two-dimensional image is replaced with a plurality of pixels of the three-dimensional image in pixel matching of the detected images. A corresponding case occurs, and the adjustment process in this case is complicated. By setting the pixel pitches of the two CCDs 28 and 29 as described above, pixel alignment can be easily performed, and high-speed synthesis processing can be performed.

Further, in this embodiment, by providing two CCDs, it is possible to individually provide an optical filter for each CCD. That is, CC for 2D image
D28 includes an optical filter 22a and a three-dimensional image CCD2.
9 is provided with an optical filter 22b (see FIG. 2).

As the optical filter 22a for a two-dimensional image, an infrared cut filter is used to prevent color fogging of the image. In contrast, a filter that selectively transmits infrared light is used as the optical filter 22b for a three-dimensional image. This is because when infrared light is used as distance measuring light, external light components other than infrared light, such as visible light, are CCDs for three-dimensional images.
This is to prevent the S / N ratio from deteriorating and the dynamic range of the signal from being narrowed when detected at 29.

By providing an optical filter individually for each CCD, a two-dimensional image CCD 28 and a three-dimensional image CC
It is possible to use an appropriate optical filter corresponding to D29. That is, in a device that detects a two-dimensional image and a three-dimensional image by one CCD, it is necessary to perform an operation such as switching of an optical filter according to the detection, but such an operation is not necessary in the present embodiment.

As described above, in the present embodiment, by adopting the two-plate system including the two-dimensional image CCD 28 and the three-dimensional image CCD 29, a CCD suitable for detecting each of the two-dimensional image and the three-dimensional image is provided. can do. Further, since an optical filter can be individually arranged for each CCD, it is possible to individually install an appropriate optical filter according to a detection operation.

Since the pixel pitch A of the three-dimensional image CCD 29 and the pixel pitch B of the two-dimensional image CCD 28 are set to be an integral multiple of B so that the correspondence can be easily performed,
Pixel adjustment of the detected image can be easily performed. That is, there is no need to perform processing between two CCDs when one pixel of the two-dimensional image CCD 28 corresponds to two pixels of the three-dimensional image CCD 29, so that the two-dimensional image and the three-dimensional image can be easily synthesized. It is possible to do.

Next, a second embodiment will be described with reference to FIGS. The parts common to the first embodiment are the first parts.
The same numbers as in the embodiment are attached. Hereinafter, portions different from the first embodiment will be described. FIG. 8 is a perspective view of a camera provided with the three-dimensional image input device according to the second embodiment. A two-dimensional image taking lens 11a is provided on the front surface of the camera body 10, and a three-dimensional image taking lens 11b is provided therebelow. That is, in the present embodiment, different imaging optical systems are used for the two-dimensional image shooting lens and the three-dimensional image shooting lens. The optical axes of the two-dimensional image taking lens 11a and the three-dimensional image taking lens 11b are adjusted such that their optical axes intersect at a predetermined distance, for example. It is arranged and photographed.

FIG. 9 is a block diagram showing a circuit configuration of the camera shown in FIG. Apertures 25a and 25b are provided in the two-dimensional image taking lens 11a and the three-dimensional image taking lens 11b, respectively, and are adjusted by an iris drive circuit 26.

A two-dimensional image CCD 28 and a three-dimensional image CCD 29 are provided on the optical axes of the two-dimensional image taking lens 11a and the three-dimensional image taking lens 11b, respectively. The light incident through the two-dimensional image taking lens 11a passes through the optical filter 22a, and then enters the two-dimensional image CC.
It is incident on D28. The light incident through the three-dimensional image photographing lens 11b passes through the optical filter 22b and enters the three-dimensional image CCD 29.

In the second embodiment, as in the first embodiment, C suitable for detecting a two-dimensional image and a three-dimensional image is used.
A CD is used. That is, the two-dimensional image CCD 28
, A high-resolution multi-pixel CCD is used, and a CCD having a relatively small number of pixels is used as the three-dimensional image CCD 29. Therefore, also in the apparatus of the second embodiment, a clear two-dimensional image can be obtained and a three-dimensional image can be detected. In addition, since an optical filter can be individually installed in each CCD, an infrared cut filter is installed in the two-dimensional image optical filter 22a to prevent color cast, and a three-dimensional image optical filter 22b is provided.
In order to cut off external light components other than the distance measuring light that becomes noise, a filter that selectively transmits infrared light can be used.

Also, as in the first embodiment, the pixel pitch of the three-dimensional image CCD 29 is
By setting the pixel pitch so as to be an integral multiple of the pixel pitch, it is possible to easily execute pixel matching at the time of image synthesis.

In the embodiment, the detection of the two-dimensional image is performed after the detection of the three-dimensional image. However, the two-dimensional image and the three-dimensional image may be detected simultaneously.

[0056]

As described above, according to the present invention, a high-definition two-dimensional image of a subject can be detected, and a three-dimensional image requiring high-speed driving of a CCD can be detected.
A two-dimensional image input device can be obtained. As a CCD for detecting a three-dimensional image, a CCD for detecting a two-dimensional image
By using a pixel pitch that is an integer multiple of one or more with respect to the pixel pitch of, high-speed synthesis processing becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view of a camera including a three-dimensional image input device according to a first embodiment.

FIG. 2 is a block diagram illustrating a circuit configuration of the camera according to the first embodiment.

FIG. 3 is a diagram for explaining the principle of distance measurement using ranging light.

FIG. 4 Distance measuring light, reflected light, gate pulse, and CCD
FIG. 4 is a diagram showing a distribution of the amount of light received by the light source.

FIG. 5 is a first half of a flowchart showing an image detection operation.

FIG. 6 is a second half of a flowchart showing an image detection operation.

FIG. 7: CCD for two-dimensional images and CCD for three-dimensional images
FIG. 2 is a diagram illustrating a configuration of a pixel.

FIG. 8 is a perspective view of a camera including a three-dimensional image input device according to a second embodiment.

FIG. 9 is a block diagram illustrating a circuit configuration of a camera according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Camera main body 11 Imaging lens 11a Imaging lens for 2D image 11b Imaging lens for 3D image 28 CCD for 2D image 29 CCD for 3D image

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) G03B 11/00 G03B 15/00 H 2H104 15/00 Z 5B047 15/02 F 5C022 17/48 5C024 15/02 19/02 5C054 17/48 19/06 5C061 19/02 19/07 5J084 19/06 35/12 19/07 H04N 5/225 F 35/12 Z H04N 5/225 5/30 5/335 V 5/30 7/18 K 5/335 Z 7/18 13/02 G01B 11/24 K 13/02 G01S 17/88 Z (72) Inventor Shinichi Kakiuchi 2-36-9 Maenocho, Itabashi-ku, Tokyo In-company (72) Inventor Kiyoshi Yamamoto 2-36-9 Maeno-cho, Itabashi-ku, Tokyo F-term in Asahi Gaku Kogyo Co., Ltd. QQ32 2F112 AA09 BA05 BA06 CA0 2 CA08 CA12 DA25 FA03 FA21 FA45 2H054 AA01 BB00 BB04 BB05 BB07 2H059 AA09 2H083 AA04 AA26 AA32. EX13 EX17 EX42 EX47 EX51 GY01 GZ01 HX23 HX31 HX58 HX60 JX02 5C054 AA05 CA06 CC02 EA01 EA07 EH07 FA02 FC15 FD01 FE26 GA04 GB06 HA17 5C061 AA20 AB04 AB06 5J084 AA05 AD01 AD05 CA04 BB31 CA04 BB02 CA04

Claims (6)

[Claims] A first image sensor configured to form an optical image of a subject on the first image sensor to detect a two-dimensional image of the subject; A second image detecting unit that receives light reflected by the subject by irradiating the light with the second image sensor, and detects a three-dimensional image of the subject according to an amount of the received light; 2. A three-dimensional image input device, wherein the pixel pitch of the two image sensors is the same as the pixel pitch of the first image sensor or larger than the pixel pitch of the first image sensor. 2. The three-dimensional image input device according to claim 1, wherein a pixel pitch of the second image sensor is an integral multiple of a pixel pitch of the first image sensor. 3. An imaging device comprising: one photographing lens; and an incident light dividing member for dividing light incident on the photographing lens, wherein the first image detecting means and the second image detecting means include the incident light dividing member. The three-dimensional image input device according to claim 1, wherein the image is detected by receiving the light divided by the (1). 4. A camera according to claim 1, further comprising a first and a second photographing lens, wherein said first image detecting means detects a two-dimensional image of said subject via said first photographing lens, and wherein said second image detecting means detects said two-dimensional image. The three-dimensional image input device according to claim 1, wherein a three-dimensional image of the subject is detected via a two-photographing lens. 5. The three-dimensional image input device according to claim 1, wherein said first image detecting means has a first optical filter, and said second image detecting means has a second optical filter. 6. The three-dimensional image input device according to claim 5, wherein the first optical filter is an infrared cut filter, and the second optical filter is an infrared transmission filter.