JP2003083716A - Input device as well as light emitting target device and image acquisition device used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that when reflected light is changed into an image, its separation from a background and the separtion of each part (a body and a hand) become more difficult the more distant an object is. SOLUTION: In the device, light is emitted to the object, only reflected light from the object is separated from background light so as to be imaged as an image, and the shape and the movement of the object are detected easily. The operation or the like of a distant object is acquired stably. Light is emitted from the image acquisition device so as to be synchronized with a transmitted timing signal, it is detected by the image acquisition device, and the position of the light emitting target device can be detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for non-contactly acquiring a motion of a person, and in particular, an input device held or worn by a target person in order to more stably detect the motion. The present invention also relates to a light emission target device used for an input device and an image acquisition device used for the input device.

[0002]

2. Description of the Related Art A technique for acquiring a person's motion in a non-contact manner with the person has been used for a long time, and in particular, by analyzing the input of an image sensor (camera), the person in the image can be detected. Research and development have been conducted for a long time in the technology of acquiring movements. However, it is difficult to stably extract motion information because of the large amount of information and complexity of images.

To address the current situation, Japanese Unexamined Patent Publication No. 10-17744
In Japanese Patent Publication No. 9, a method is disclosed in which a background or the like is removed and an image of only a target object is obtained by actively emitting light and capturing the reflected light of the object with an image sensor. This utilizes the fact that the intensity of reflected light from a distant background is much smaller than that of reflected light from a nearby target object, so that it is hardly reflected in the image.

According to Japanese Patent Laid-Open No. 9-243325, the position of the light source can be specified and the movement of the body can be acquired by wearing the light emitting body and acquiring it with a CCD camera. It is shown. However, here, since the operation is acquired by a normal camera, a bright portion such as a window may be reflected in the background, which may hinder the detection. Further, although it is mentioned that the distance is obtained depending on the size of the reflected light source, it is not mentioned about the acquisition of other geometrical feature values.

[0005]

[Patent Document 1] Japanese Patent Application Laid-Open No. 10-1774
When the device shown in 49 is used, a problem occurs when trying to extend the distance range of the target object. That is, as the distance of the target object increases, the ratio of the distance between the target object and the background gradually decreases. Since the intensity of the reflected light from the object actually depends not only on the distance but also on the reflectance of the surface of the object, etc., it may be difficult to separate the background and the target object depending on these conditions.

[0006] Basically, the intensity of reflected light is equal to the object distance of 2
Since it is inversely proportional to the power, for example, the strength of 30 cm and the strength of 60 cm are 4 times different, so that the separation is easy. However, in case of 1m and 1m 30cm (the difference of the same distance is 30cm
However, since the intensity ratio is about 1: 0.6, it becomes difficult to separate the background and the object as the distance increases.

The present invention proposes an auxiliary light emitting target device to be attached to or held by a target object (in this case, a person in many cases) so that the motion can be easily detected even in such a situation. To do. It also describes an image acquisition device for interlocking with these auxiliary devices, and proposes an input device combining them.

[0008]

SUMMARY OF THE INVENTION The present invention is a timing signal transmitting means for transmitting a timing signal by light or radio, and a timing signal receiving means for receiving the timing signal transmitted by the timing signal transmitting means. Means, light emitting means for emitting light at a timing corresponding to the timing signal received by the timing signal receiving means, and light diffusing means for diffusing the light emitted by the light emitting means in a specific shape. It is characterized in that it has an image pickup means for taking an image of the light emitted by the light emitting means diffused through the light diffusing means by removing other external light.

Further, a timing signal transmitting means for transmitting a timing signal by light or radio, a timing signal receiving means for receiving the timing signal transmitted by the timing signal transmitting means, and a timing signal receiving means. Through a light emitting means for emitting light at a timing corresponding to the timing signal received by the means, a light diffusing means for diffusing the light emitted by the light emitting means in a specific shape, and the light diffusing means. It is characterized by having an image pickup means for picking up only the light diffused by the light emitting means and emitted at a specific time associated with the timing of light emission of the light emitting means.

The present invention is a light emission target device for emitting light in response to a timing signal from the image acquisition device, and a timing signal receiving means for receiving the timing signal from the image acquisition device. And a light emitting means for emitting light at a timing corresponding to the timing signal received by the timing signal receiving means, and a light diffusing means for diffusing the light emitted by the light emitting means in a specific shape. It is a light emitting target device.

Further, a light emission target device for emitting light in response to a timing signal from the image capturing device, and timing signal receiving means for receiving the timing signal from the image capturing device, and Light emitting means for emitting light at a timing corresponding to the timing signal received by the timing signal receiving means, switch means for controlling the state of light emitted by the light emitting means, and light emitted by the light emitting means. And
And a light diffusing unit for diffusing and emitting the light controlled by the switch unit in a specific shape.

Further, according to the present invention, a timing signal transmitting means for optically or wirelessly transmitting a timing signal for urging the light emitting target device to emit light to a light emitting target device for emitting light from an object whose image is to be acquired. And an image capturing unit for capturing the light emitted from the light emitting unit of the light emitting target device according to the timing signal of the timing signal transmitting unit by removing other external light. .

Further, a timing signal transmitting means for transmitting a timing signal for urging the light emitting target device to emit light to the light emitting target device for emitting light from an object whose image is to be acquired, by means of a timing signal transmitting means. Light emitted from the light emitting means of the light emitting target device according to the timing signal of the timing signal transmitting means,
The image acquisition device is characterized by having an imaging means for imaging only the light emitted at a specific time associated with the timing of this light emission.

With such a configuration, the movement of the target object can be reliably detected by mounting or holding the target device on the target object to operate even if the object to be acquired is at a long distance.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<Basic System> FIG. 1 shows the basic configuration of a reflected light image acquisition apparatus, which is the object of the present invention. The details of the reflected light image acquisition device are described in Japanese Patent Application Laid-Open No. 10-177449, so only the outline will be given here. Light emitting unit 12
Illuminates the acquisition target object 14 with a light source such as an LED. In this case, if near infrared light or the like is used, it is not necessary to feel glare when the target is a person. Next, the light emitting unit 12
The light emitted from is reflected by the target object and returns, and forms an image on the image sensor 1 via the optical system 4.

The image sensor 1 is constructed so that, unlike a normal image, only the object-reflected light of the emitted light can be acquired as an image. Specifically, it is realized by emitting light from the LED in a short time, performing imaging twice when light is emitted and before and after no light emission, and extracting the difference. This function is realized by the image sensor itself or the control unit 11 including the image sensor and its peripheral circuits.

<Light Emitting Target Device> FIG. 2 illustrates a first embodiment of the present invention. The image acquisition device 5
The configuration is almost the same as that of the image acquisition device in FIG.

The image capturing device 5 causes the light emitting section 2 to emit a timing signal. The light receiving unit 7 of the light emission target device 6 receives this light and transmits it to the timing control unit 8. The timing control unit 8 extracts a timing signal from the received light signal and causes the light emitting unit 10 to emit light at an appropriate timing associated with the timing signal.
The light emitted by the light emitting unit 10 is diffused in a specific shape by the light diffusion plate 9. The light diffusion plate 9 is composed of an object that transmits this light and an object that does not transmit the light, and is configured to diffuse and emit light in a specific shape.

The light emitting section 2 is similar to the light emitting section 12 of FIG. 1, but in this case it functions as a means for transmitting a timing signal. This is not limited to light, and any wireless transmission means such as wireless or ultrasonic waves may be used.

Further, the conventional reflected light image acquisition device can be used as it is. This is because the light emitting unit of the original image acquisition device has a wide light emitting directional characteristic, and thus any light receiving unit existing in the imaging target range can receive the light. The light emitting target for receiving light does not always face the image acquisition device, so it is important that the light is diffused by the diffusion plate or the like.

Here, in the image acquisition device 5, several variations can be considered in the timing signal generation timing and the image sensor imaging timing. The simplest example is to image at the same time as the timing signal is transmitted. That is, the image acquisition device 5 operates almost like a basic system. The light emitting target device 6 is
When the light receiving unit 7 receives the timing, it immediately starts emitting light. Therefore, even if there is a slight delay, the light emission of the light emitting unit 10 of the light emission target device and the imaging by the image acquisition device 5 are substantially synchronized. This is shown in FIG.

In FIG. 3, the timing generation pulse and the light emission pulse of the light emission target have the same width, but if the light emission width is fixed and the light emission width is fixed, the pulse widths need not necessarily be the same. There is no. This also applies to the other variations below.

When operated at the timing shown in FIG. 3 (a),
The same image acquisition device 5 as the basic system can be used on the imaging side. However, if the basic system is used as it is, the acquired image includes both the reflected light of the timing light 18 emitted by the image acquisition device 5 and the light emission 19 by the light emission target device 6. I will end up. When the target object is relatively far, the influence is small, but when the target object is near, the reflected light alone causes a considerable amount of light, which may make it difficult to detect the target object.

In such a case, the light emission 18 of the timing signal and the light emission 19 of the light emission target may be shifted as shown in FIG. 3 (b). By doing so, the reflected light and the light emission of the target do not coexist. Further, as shown in FIG. 3C, when the imaging is performed twice, the reflected light 18 due to the emission of the timing signal and the emission 19 of the target can be separately acquired.

Further, the configuration is changed from the basic system,
If radio waves or ultrasonic waves are used, there is no fear of interference, and the wavelengths of the light 18 on the timing generation side and the light 19 of the target may be different, and the interference may be prevented by a filter. Further, in order to remove the influence of fluctuating ambient light such as a fluorescent lamp, the modulated light is emitted and demodulated on the light receiving side to stabilize the operation.

The light emitting unit 10 of the light emitting target device 6 does not have to be one. A plurality of light emitting units may emit light at the same time, or a plurality of light emitting units may emit light in sequence. Further, the light emitting unit selected according to the situation may emit light.

FIG. 4 shows an example in which the light emitting target device has a plurality of light emitting portions. For example, each of the light emitting units 15 and 16 is embedded in a light emitting target device like a boxing glove to emit light in synchronization with a timing signal. A person 17 operates a light emission target device that is likened to this glove. Here, when only the reflected light image is used as in the image acquisition apparatus of FIG. 1, not only the hand but also the whole body is imaged, and therefore it is necessary to cut out the hand portion from that. However, by actively emitting the target light in this way, only the position of the globe can be accurately acquired.

If the two gloves are to be clearly separated and obtained, it can be realized by emitting light at different timings for one timing signal and capturing the image twice. An example of the timing signal in that case is shown in FIG. 5 (this example has three light emitting units). Timing signals 21, 22, 23 for driving the three light emitting means are sequentially generated with respect to the received timing signal 18.
Along with that, imaging is performed three times (24).

Further, as shown in FIG. 6, code information may be sent from the timing generation side at the same time as the timing, and different light emitting means may be caused to emit light in accordance with the code. Reference numerals 25 and 28 are waveform patterns transmitting code information with timing, and reference numerals 26 and 29 are drive signals corresponding to different light emitting means. As a result, the present invention can be applied to the case where it is desired to acquire the feature amount that differs depending on the mode.

<Light emitting target device with switch>
If a switch is added to the light emitting target device and the state of the light emitting target device is changed depending on the state of the switch, the range of application is further expanded.

FIG. 7 is a block diagram of a light emitting target having this switch. Only differences from the block diagram of FIG. 2 will be described. The configuration of the light emission target device of FIG.
The light emitting target device 31 having the configuration of FIG.
Is added. Various forms such as a button and a slide lever can be considered. The timing control unit 8 controls the light emitting unit 10 based on the timing signal received by the light receiving unit 7.
Light is emitted, and at that time, light is emitted in different states depending on the input from the switch means.

Although there are various ways to configure the structure, in order to keep the circuit as simple as possible, a mechanism for temporarily covering a part or all of the diffusely reflecting portion by a switch operation is used to emit light. It is better to capture changes in shape.

When the light emitting target device having such a structure is considered as an input device for a video game, it is mainly operated by a player and used. And
If the input device has a switch and you can express various states by pressing the switch, you can enjoy more.

For example, assume that the device is attached to a playarm-shaped play equipment. If the pistol is aimed at a screen where an image acquisition device is installed nearby, the direction of the pistol can be detected. The trigger is a switch, and the state of the light emitting target device is changed by pulling the trigger.
For example, the light emitting unit 10 that normally does not emit light may additionally emit light, the amount of light emission may temporarily increase or decrease, or the shape of diffuse reflection may change. Then, this change is detected by the processing of the image acquisition device, and it is detected that the handgun is triggered.

When a playground equipment is made as an item (tool) used in the game, there is a switch there, and if the mode changes to various modes each time the switch is pressed, the usage method of the item is changed. Spread out.

<Mode in which Light Emitting Target Leads Timing> In each of the above examples, the image capturing device side
The timing of light emission was specified. In the following example, the light emission target spontaneously emits light, and the image acquisition device side detects the light emission timing and simultaneously acquires an image. In this case, since the light emitting target side does not have to have a light receiving unit, the circuit has a simpler circuit configuration, and the light emitting target can be configured at a lower cost.

The structure of this embodiment is shown in FIG. The light emission target 35 has a simpler structure, and the light emission control unit 3
3 only causes the light emitting section 34 to emit light on a pulse. The light diffusing plate 9 is the same as the conventional one. In the image acquisition device 38, the light receiving unit 36 receives the light that has passed through the light diffusion plate 9, and this is used to detect the timing of light emission. The output of the light receiving unit 36 is converted into a timing signal by the timing detection unit 37 and sent to the control unit 3. The control unit 3 causes the image sensor 1 to take an image in accordance with this timing signal. The timing of imaging is as shown in FIG.
The imaging operation is performed when it is determined that the light emitting target is emitting light. In fact, in the vicinity of it, the second
The image of only the light emission target is obtained as the differential output.

<Shape of Diffusing Surface> Here, the shape of the diffusing surface of the diffusing plate 9 of the light emitting target device described above will be described. In particular, the geometrical feature amount of the shape of the diffusion surface of the diffusion plate 9 suitable for acquiring the position of the light source of the light emission target will be described.

Of the diffusion surface shapes used for the purpose of the present invention, the simplest one is a circular diffusion shape surrounded by black as shown in FIG. 9 (a). Here, if only the light from the diffusion surface is reflected in the detected image, the position of the light source of the light emission target can be easily obtained by calculating the center of gravity of the light. Surrounding the area with black color makes it easy to separate it from such an external light source, because even if there is a light source that may move into the image, there is a region around the diffusion surface where nothing is reflected. Because.

Further, as shown in FIG. 9 (b), the black area may not necessarily be circular but may be square. It does not necessarily have to be black, and may be omitted if there is no external light source that affects it. Such a shape is suitable for simply obtaining the position. Further, since the size in the image changes depending on the distance to the target, the distance can be obtained by calculating the area.

However, in the case where the diffusion surface is a circle, if the surface deviates from the direction of the image acquisition device, the shape changes to an ellipse as shown in FIG. 9C. Even in this case, if the longest system is obtained, it can be converted into the distance, but if the area is used, it becomes slightly smaller. Therefore, if the diffusion surface is spherical, it always looks like a circle regardless of the direction of the light emitting target as shown in FIG. 9D, so that the area can be converted into a distance. However, in general, it is not so easy to form the diffusion surface in a completely spherical shape.

As another shape, a shape as shown in FIG. 10 (a) can be considered. In this case, the plurality of light sources 40-4
3 appears as an image, and their center distance can be converted into the distance to the target. In this case, there may be a plurality of light emitting parts, or one light emitting part may be divided into a plurality of light emitting parts in the shape of a diffusion plate. In this case, since the quadrangle is distorted depending on the orientation of the light emitting target, the orientation of the surface can be obtained from those calculations.

Further, if the shape is as shown in FIG. 10B, the orientation can be obtained more accurately. Here, the light emitting portion 44 projects in front of the plane on which the other four light emitting portions are located. When facing straight to the image pickup device, the positions of the light emitting portion 44 and the middle of the positions of the other four light emitting portions are the same, but when they are not aligned, they do not match. When the diffuser plate having such a shape is attached to the tip of a play equipment such as a pistol, it is possible to efficiently detect whether or not the sight is aligned.

Further, in order to efficiently obtain the direction of the light emitting target, it is preferable to use a diffusing surface having a different shape. For example, if a diffusion surface as shown in FIGS. 11A and 11B is used, it is possible to detect rotation (tilt) in a state where the target faces the image acquisition device. In this shape, there is a small light emitting surface 46 next to the large light emitting surface 45. The position in the rotation direction can be known by looking at the position (upper, lower, left, and right) of the small light emitting surface with respect to the center of the large light emitting surface.

In the case of FIG. 11 (c), it is indistinguishable when the image is horizontally inverted, but the accuracy of detecting the direction of the light emission target is increased because the light emission target is on both sides. That is, FIG. 11 (c)
When such a light emitting target is used, various directions as shown in FIG. 12 can be detected.

As shown in FIG. 12 (a), when facing straight, the large light emitting surface in the center is a circle, and the target position can be found by finding the center. In addition, FIG.
When tilted as in (b) and (c), the direction can be known by the distortion of the circle. For example, the large light emitting surface 45 in the center
Looks like an ellipse, but it is found that it is tilted about the direction of its major axis, and the degree of tilt can be found from the ratio of the major axis to the minor axis. Also, when rotating as shown in FIG.
It can be detected by the inclination of a straight line connecting small light emitting surfaces.

Further, as shown in FIG. 13, the rod-shaped play equipment may be provided with a plurality of light emitting portions 47 to 49 to detect the direction of the rod. This is suitable for games where you fight with a sword. From the line passing through the center of multiple light emitting parts,
By knowing the longitudinal direction of the sword and looking at the width in the direction perpendicular to the longitudinal direction, the distance of the light emitting surface can be known.

Various other diffusion shapes are conceivable, but all diffusion shapes formed to efficiently detect a specific geometric feature amount are within the scope of this patent.

<Reflective Target Consisting of Objects Having Different Reflectances> In all of the above embodiments, the light emitting target emits light to make it easy for the image acquisition device to capture the geometric information. It was Next, a device that does not use the light emitting unit and assists the motion detection by the image acquisition device will be described. This device has been devised so that the geometric information to be acquired can be appropriately extracted from an object that reflects light emitted by the light emitting part of the reflected light image acquisition device well and an object that does not reflect (absorb) light. It is composed of shapes and arrangements.

FIG. 14 shows the structure of an input device using a reflective target which does not use a light emitting section. In this case, it is used with the basic reflected light image acquisition device shown in FIG.
That is, the light from the light emitting unit 12 of the image acquisition device is reflected by the reflection target 50. As described above, the reflection target 50 is configured such that the reflecting object and the oppositely non-reflecting (absorbing) object are shaped and arranged so that the desired geometrical information can be properly extracted. Then, the image sensor 1 receives the light reflected by the portion having the high reflectance, via the optical system 4. The image capturing timing of the image sensor 1 and the light emitting timing of the light emitting unit 12 are controlled by the control unit 11 as in the configuration of FIGS. 1 and 2.

It is to be noted that the shape of the portion having a high reflectance is characterized in that it has a shape suitable for obtaining a specific characteristic amount, like the light emitting target.

As with the light emitting target, it is also effective to have a switch means so that the shape of the reflective target changes depending on the state of the switch.

With such a structure, detection is easier than using a light emitting section, but if a high reflectance is used, even if it is worn on the body, reflected light that is sufficiently brighter than the body itself can be obtained. Therefore, the detection is relatively easy.
Further, in this case, it is important to surround an object having high reflectance with an object having low reflectance. By doing so, even if there is a thing with a relatively high reflectance nearby, it can be sufficiently discriminated. In this case, on the contrary, the same effect can be obtained by surrounding the object having the low reflectance with the object having the high reflectance.

According to the embodiment of the present invention as described above, the following operational effects can be obtained. In other words, even if a means for illuminating a target object with a light emitting means and capturing only the object reflected light as an image is used in the related art, it is possible to detect a nearby target object separately from the background, and to detect information such as its movement. I was able to take it out easily.

However, when trying to acquire a distant target object, the difference in brightness from the background gradually decreases, and detection becomes difficult. In addition, when capturing the whole body and detecting the position of only the hand from it, some image analysis was required. The present invention can be used in such a situation, and its movement can be reliably detected by operating with the device mounted or held even at a long distance.

On the other hand, let us consider the effect when these are applied to an application such as a video game. Being able to enjoy the game using body movements greatly enhances the enjoyment. However, in some cases, it is more realistic to carry something with something. For example, in a shooting game, you can make a pistol shape with your hands, but it is more realistic and fun to play with a pistol-shaped play equipment. Also, if it is a game that uses swordplay, it is more fun to swing around with a rod-shaped play equipment equivalent to a sword.

In this case, it is very effective if there is a device capable of efficiently detecting the play equipment. There is also a method of marking the playground equipment with a color and shooting it with a video camera and detecting it based on the color information, but the same color is picked up from a complicated background, or the color changes depending on the surrounding lighting conditions. It is very difficult to detect it with sufficient accuracy. According to the present invention, the detection becomes very easy.

Even today, there are various play equipments for playing games. For example, there is one that has a built-in acceleration sensor and detects its movement. However, it is relatively difficult to obtain an accurate position, and it is costly to make a dedicated device. In the present invention, the image acquisition device is a relatively complicated system, but the light emitting target and the reflective target are very simple devices and can be manufactured at a very low cost. If you purchase an image acquisition device at the beginning, you will be able to play in a variety of ways simply by purchasing relatively inexpensive play equipment.

[0060]

As described above, according to the present invention,
Even if the object to be acquired is at a long distance, by mounting or holding the target device on the target object to operate, it is possible to reliably detect the movement of the target object.

[Brief description of drawings]

FIG. 1 is a reflected light image pickup device that is the basis of an embodiment of the present invention.

FIG. 2 is a diagram showing a light emitting target device and an image acquisition device according to an embodiment of the present invention.

FIG. 3 is a diagram showing operation timings of a light emitting target and an image acquisition device according to an embodiment of the present invention.

FIG. 4 is an example using a plurality of light emitting targets according to an embodiment of the present invention.

FIG. 5 is a diagram showing operation timings of a light emitting target and an image acquisition device according to an embodiment of the present invention.

FIG. 6 is a diagram showing operation timings of a light emitting target and an image acquisition device according to an embodiment of the present invention.

FIG. 7 is an example of a light emitting target having a switch unit according to an embodiment of the present invention.

FIG. 8 is an example of a light emitting target that does not receive a timing signal according to an embodiment of the present invention.

FIG. 9 is an example of the shape of a diffusion surface of a light emitting target according to an embodiment of the present invention.

FIG. 10 is an example of the shape of a diffusion surface of a light emitting target according to an embodiment of the present invention.

FIG. 11 is an example of the shape of a diffusion surface of a light emitting target according to an embodiment of the present invention.

FIG. 12 is an example of the shape of a diffusion surface of a light emitting target according to an embodiment of the present invention.

FIG. 13 is an example of the shape of a diffusion surface of a light emitting target according to an embodiment of the present invention.

FIG. 14 is an example of a reflective target according to an embodiment of the present invention.

[Explanation of symbols]

1 image sensor 2 Light emitting part 3 control unit 4 Optical system 5 Image acquisition device 6 Emission target device 7 Light receiving part 8 Timing control section 9 Light diffuser 10 Light emitting part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takahiro Harashima             1st Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi, Kanagawa             Inside the Toshiba Research and Development Center F-term (reference) 2C001 BC05 CA00 CA08                 2F065 BB05 CC16 FF04 GG07 GG08                       JJ03 JJ26 NN02 QQ13                 5C022 AA15 AB15 AB64 AB68 AC69                 5C054 CA01 CA04 CA08 CG07 CH02                       FC04 FC13 HA15

Claims (13)

[Claims] 1. A timing signal transmitting means for transmitting a timing signal by light or wireless, a timing signal receiving means for receiving the timing signal transmitted by the timing signal transmitting means, and a timing signal receiving means. A light emitting means for emitting light at a timing corresponding to a timing signal received by the means, a light diffusing means for diffusing the light emitted by the light emitting means in a specific shape, and a light diffusing means via the light diffusing means. An input device comprising: an image pickup unit for taking an image of the diffused light emitted from the light emitting unit by removing other external light. 2. A timing signal transmitting means for transmitting a timing signal by light or radio, a timing signal receiving means for receiving the timing signal transmitted by the timing signal transmitting means, and a timing signal receiving means. A light emitting means for emitting light at a timing corresponding to a timing signal received by the means, a light diffusing means for diffusing the light emitted by the light emitting means in a specific shape, and a light diffusing means via the light diffusing means. An input device comprising: an image pickup unit for picking up only the diffused light emitted by the light emitting unit and emitted at a specific time associated with the timing at which the light emitting unit emits light. 3. A light emission target device for emitting light in response to a timing signal from the image acquisition device, and timing signal receiving means for receiving the timing signal from the image acquisition device, A light emission target device having a light emitting means for emitting light at a timing corresponding to the timing signal received by the timing signal receiving means, and a light diffusing means for diffusing and emitting the light emitted by the light emitting means in a specific shape. . 4. A light emission target device for emitting light in response to a timing signal from the image acquisition device, and timing signal receiving means for receiving the timing signal from the image acquisition device, Light emitting means for emitting light at a timing corresponding to the timing signal received by the timing signal receiving means, switch means for controlling the state of light emitted by the light emitting means, and light emitted by the light emitting means. And a light diffusing unit for diffusing and emitting light controlled by the switch unit in a specific shape. 5. The light emission target device according to claim 4, wherein the light emission means is composed of a plurality of light emission means, and the light emission state is controlled by selecting the light emission means to be emitted by the switch means. 6. The light emission target according to claim 4, wherein the light emission state of the light emission target is controlled by changing the intensity of light emission of the light emission means by the switch means. 7. A light emission target device for emitting light in response to a timing signal from the image acquisition device, and timing signal receiving means for receiving the timing signal from the image acquisition device, A light emitting means for emitting light at a timing corresponding to the timing signal received by the timing signal receiving means, a light diffusing means for diffusing and emitting the light emitted by the light emitting means in a specific shape, and the light diffusing means. And a switch means for controlling the diffusion shape of light by the light emitting target device. 8. A timing signal transmitting means for transmitting, by light or wirelessly, a timing signal for urging the light emitting target device to emit light to a light emitting target device for emitting light from an object whose image is to be acquired. An image acquisition device comprising: an image pickup means for taking an image of light emitted from the light emitting means of the light emitting target device by removing the outside light other than the light emitted from the light emitting means of the light emitting target device according to the timing signal of the timing signal transmitting means. 9. A timing signal transmitting means for transmitting, by light or wirelessly, a timing signal for urging the light emission target device to emit light to a light emission target device for causing an object for which an image is to be obtained to emit light. The light emitting means of the light emitting target device emits light according to the timing signal of the timing signal transmitting means, and has an image pickup means for picking up only light emitted at a specific time associated with the timing of the light emission. Image acquisition device characterized by. 10. A light emitting means for emitting light in a pulsed form, a timing detecting means for detecting a timing of light emission from the light emitting means, and a light emitting timing synchronized by the light emitting timing detected by the timing detecting means, An input device, comprising: an image capturing unit for capturing only light emitted at a specific time associated with the emission timing or the emission timing. 11. A timing detection unit for detecting the timing of light emission, and light emission at a specific time associated with the timing of the light emission or the timing of the light emission in synchronization with the timing of the light emission detected by the timing detection unit. A light emission target device comprising: a light emitting means for emitting light in a pulse shape, in contrast to an image acquisition device having an image capturing means for capturing only the emitted light. 12. The input device according to claim 10, wherein the light emitting means transmits the timing of light emission by modulated light and emits pulsed light for imaging. 13. A timing detection unit for detecting the timing of light emission, and light emission at a specific time associated with the timing of the light emission or the timing of the light emission in synchronization with the timing of the light emission detected by the timing detection unit. The image acquisition device having an image pickup means for picking up only the emitted light is provided with a light emitting means for emitting light in a pulse shape and a switch means for controlling the light emitting state of the light emitting means. A characteristic light emitting target device.