JPH09273920A - Apparatus and method for detecting posture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect at a high speed whether or not a posture of a human body agrees with any of a plurality of reference postures without carrying out complicate processing of signals. SOLUTION: Images corresponding to a plurality of reference postures are recorded to a hologram 6 while angles of incidence of reference lights are changed. A light subjected to spatial modulation by an LCD(liquid crystal display) panel 4 displaying a posture of a human body 1 to be detected is projected to the hologram 6. If the posture of the human body 1 agrees with any one of the reference postures, a luminous flux is emitted from the hologram 6 in a direction of incidence of the reference light corresponding to the reference posture. The luminous flux from the hologram 6 is detected by pohotodetectors 21, 22, 23, 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to whether or not the posture of a human body to be detected, or the posture of each part of the human body, matches or does not match any one of a plurality of preset reference postures. It belongs to the technical field of a posture detection device for determining whether or not.

[0002]

2. Description of the Related Art Conventionally, all or part of the human body is CC
An image is captured by a D (solid-state image sensor) camera, and based on an image signal (electrical signal) output from this CCD camera,
There has been proposed a posture detection device configured to detect the posture of the human body or each portion of the human body.

In such a posture detecting device, the image signal output from the CCD camera is arithmetically processed by a signal processing device (computer) to determine the posture of the human body or each part of the human body. There is.

Such a posture detecting device is configured so that the discrimination result of the posture of the human body or each portion of the human body is compared with the information on the reference posture stored in advance in the memory or the like, and the game is performed. Used as a device and posture evaluation device.

For example, in this attitude detecting device, information on a plurality of reference attitudes is sequentially read out from the memory, the reference attitudes are sequentially displayed on a monitor, etc., and based on an image signal output from the CCD camera each time. ,
It is possible to determine whether or not the posture of the human body, or the posture of each part of the human body, and the reference posture displayed on the monitor or the like match, and determine the win or loss or the evaluation (score) depending on the size of the number of matches.

[0006]

In the attitude detecting device as described above, since the amount of information of the image signal is enormous, even if a device capable of high speed processing is used as the signal processing device, it is enormous. It takes a long time to process various information.

Therefore, in this posture detecting apparatus, since it takes a long time to determine whether or not the reference posture and the posture of the human body or each part of the human body match, the reference postures are sequentially evaluated. It is not possible to determine whether the human body or the posture of each part of the human body is in agreement or inconsistency while making a quick change. That is, this attitude detection device
It is extremely difficult in practice to use it as a game device or a posture evaluation device as described above.

The present invention has been proposed in view of the above-mentioned circumstances, and it is determined whether or not the posture of the human body or each posture of the human body matches any of a plurality of preset reference postures stored in advance. It is intended to provide a posture detection device and a posture detection method that can quickly and reliably determine whether they do not match.

[0009]

In order to solve the above-mentioned problems, a posture detection apparatus according to the present invention comprises a light source, an image input means for inputting the posture of a human body or each part of a human body as image information, and this image input means. The spatial modulation means for modulating the amplitude distribution of the light from the light source according to the image information input by the information recording medium, the information recording medium on which a plurality of reference image information are recorded in advance, and the information light modulated by the spatial modulation means The information recording medium is provided with optical means for making the information recording medium incident and a plurality of light detecting means for detecting light emitted from the information recording medium at different angular positions with respect to the information recording medium. As for the recorded reference image information, the light from the light source is emitted according to a plurality of types of image information corresponding to a plurality of types of reference postures input by the image input means. A plurality of types of information light whose amplitude distribution is modulated by the spatial modulation means is incident on the information recording medium by the optical means, and a plurality of reference lights corresponding to these information lights are incident on the information recording medium, The information light and the reference light corresponding to each other are formed by interference, and the incident angle of each of the reference lights with respect to the information recording medium corresponds to the angular position of each of the light detecting means with respect to the recording medium. That is what was done. In other words, each of the light detecting means is arranged on or near a straight line formed by the corresponding principal ray of the reference light.

Further, according to the present invention, in the above attitude detecting apparatus, reference attitude image output means for generating and selectively outputting image signals corresponding to a plurality of kinds of reference attitudes, and output from the reference attitude image output means. Image display means for sending an image signal corresponding to the image signal and a discrimination signal indicating which of the light detection means has detected the light emitted from the information recording medium, and And a signal processing unit to which a selection signal indicating the selection result of the reference attitude in the reference attitude image output unit is sent, and the signal processing unit outputs a judgment signal based on comparison and comparison between the discrimination signal and the selection signal. I decided to do it.

Further, according to the present invention, in the above attitude detecting device, the signal processing means outputs a judgment signal when the judgment signal and the selection signal match.

Further, according to the present invention, in the above attitude detecting device, the information recording medium is a volume hologram recording medium.

In order to detect the above-mentioned problems, a posture detecting method according to the present invention inputs a posture image to a holographic element in which a plurality of reference posture images are recorded by using reference beams having different incident angles. A step of detecting the intensity and direction of light emitted from the holographic element when the posture image is input to the holographic element; and the holographic from the intensity and direction of the detected light. And a step of determining which of the plurality of reference attitude images the incident image on the element matches or does not match any of the plurality of reference attitude images.

In order to solve the above-mentioned problems, the attitude detecting apparatus according to the present invention is a holographic element in which a plurality of reference attitude pixels are recorded by using reference beams having different incident angles, and the holographic element. Means for inputting a posture image to the graphic element, means for detecting the intensity and direction of the light emitted from the holographic element when the posture image is input to the holographic element, and the intensity of the detected light From this direction, it is determined whether the posture image incident on the holographic element matches any of the plurality of reference posture images or does not match any of the reference posture images.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the attitude detecting device according to the present invention includes a laser oscillator 3 which serves as a light source. The laser oscillator 3 emits a coherent laser beam. The laser light flux emitted from this laser oscillator 3 is
It is incident on the collimator lens 31, and is made into a parallel light beam by this collimator lens 31.

The posture detecting apparatus is provided with a CCD (solid-state image sensor) camera 2 which serves as an image input means for inputting the posture of the human body 1 (or the posture of a part of the human body 1) as image information. The CCD camera 2 converts the captured image into image information (electrical signal) and outputs it.

The image information is an LC which serves as a spatial modulation means.
It is sent to the D (liquid crystal display) panel 4. The LCD panel 4 displays an image according to the image information. This LC
The D panel 4 displays the brightness (shading) of the image to be displayed as this L
It is displayed as a difference in transmittance in the CD panel 4.

The LCD panel 4 modulates the amplitude distribution of the laser beam emitted from the laser oscillator 3 according to the image information. That is, the laser light flux that has passed through the collimator lens 31 is the LCD panel 4.
Is incident with a predetermined incident angle. This L
The laser light flux incident on the CD panel 4 has its amplitude distribution modulated according to the image information displayed by the LCD panel 4, and is transmitted (or reflected) as information light.

The information light whose amplitude distribution has been modulated by the LCD panel 4 has a condenser lens 5 as an optical means.
Is incident on. The condenser lens 5 makes the incident information light incident on the hologram 6, which is an information recording medium, at a predetermined incident angle.

In the hologram 6, a plurality of types of reference postures A,
A plurality of reference image information corresponding to B, C, and D are recorded in advance. This hologram 6 has a glass substrate and a photosensitive material coated on this glass substrate.

The light-sensitive material may be one used in a general photographic material, or one commercially available as a volume hologram material. When a volume hologram material is used as the photosensitive material, the volume hologram material is applied on the glass substrate so as to have a thickness of about several tens of microns (μm). Examples of this hologram material include "photopolymers for holography" by WKSmothers and others.
(January 1990, Practical Holography (I
V) SPIE OE (Practical Holography IV, SPIE OE
/ Laser Conference Proceedings, 1212-03, Los Angels, C
A, Jan.pp14-19,1990)), a material disclosed as a hologram material by DuPont can be used.

On the side where the information light is incident on the hologram 6, there are provided a plurality of light detecting means for detecting the light emitted from the hologram 6 at different angular positions with respect to the hologram 6. The first to fourth photodetectors 21, 22, 23, and 24 are provided.

In order to make it easier to see in FIG. 1, the first to fourth photodetectors 21, 22, 23, 24 and the maximum value detection circuit 7 are provided on the opposite side of the hologram 6 from the side on which the information light is incident. Although shown in the drawing, in reality, they are arranged so as to rotate 180 degrees from the position shown in the drawing around the hologram 6. Further, the first to fourth photodetectors 21, 22, 23, 24 are arranged so as to be able to receive the light emitted from the hologram 6, which will be described later. These first to fourth photodetectors 21, 22, 23, 24
Are each configured to have a light receiving element such as a photodiode, and when the light emitted from the hologram 6 is received, it outputs a detection output. These photodetectors 21, 2
The respective detection outputs output from 2, 23 and 24 are sent to the maximum value detection circuit 7. The maximum value detection circuit 7 determines which of the detection outputs sent from the plurality of photodetectors 21, 22, 23, 24 is the highest output, and outputs a determination signal indicating this determination result. To do.

By the way, the plurality of reference image information recorded on the hologram 6 is based on the plurality of types of image information corresponding to the plurality of types of reference attitudes A, B, C and D input by the CCD camera 2. A plurality of types of information light, the amplitude distribution of which is modulated by the light from the laser oscillator 3, is incident on the hologram 6 by the condenser lens 5, and a plurality of reference lights corresponding to these information lights are generated. The information light and the reference light which are incident on the hologram 6 and correspond to each other are formed by interference.

That is, in order to record the first reference image information corresponding to the first reference attitude A on the hologram 6, as shown in FIG. 3, first, the CCD camera 2 is recorded.
Thus, the first image information corresponding to the first reference posture A is input.

Then, the LCD panel 4 has the first
The image corresponding to the image information of is displayed. Also, this LCD
The panel 4 transmits the light from the laser oscillator 3 to the first
The amplitude distribution is modulated in accordance with the image information of 1 to obtain the first information light. The first information light is made incident on the hologram 6 by the condenser lens 5.

On the other hand, a part of the laser light flux before entering the LCD panel 4 is branched from the optical path of the laser light flux by the beam splitter 32, and the mirrors 33, 34 ,.
After passing through 35, as the first reference light A, the hologram 6
Is incident on. The first reference light A corresponds to the first information light, and with respect to the hologram 6,
The light is incident at the first reference light incident angle.

Then, the first information light and the first reference light interfere with each other to form one striped pattern reference image information, which is recorded on the hologram.

The first reference light incident angle corresponds to the angular position of the first photodetector 21 with respect to the hologram 6.

Further, in order to record the second reference image information corresponding to the second reference posture B on the hologram 6, first, as shown in FIG. The second image information corresponding to the reference posture B of 2 is input.

Then, the LCD panel 4 displays the second
The image corresponding to the image information of is displayed. Also, this LCD
The panel 4 transmits the light from the laser oscillator 3 to the second
The amplitude distribution is modulated in accordance with the image information of (2) to obtain second information light. The second information light is made incident on the hologram 6 by the condenser lens 5.

On the other hand, a part of the laser beam before entering the LCD panel 4 is branched from the optical path of the laser beam by the beam splitter 32, and the mirrors 33, 34 ,.
35 through the hologram 6 as the second reference light B.
Is incident on. The second reference light B corresponds to the second information light, and with respect to the hologram 6,
The light is incident at the second reference light incident angle.

Then, the second information light and the second reference light interfere with each other to form two reference image information in a striped pattern and are recorded on the hologram.

The incident angle of the second reference light corresponds to the angular position of the second photodetector 22 with respect to the hologram 6.

Then, with respect to the hologram 6, the third
In order to record the third reference image information corresponding to the reference posture C, the CCD camera 2 first displays the third image information corresponding to the third reference posture C as shown in FIG. input.

Then, the CCD panel 4 has the third
The image corresponding to the image information of is displayed. Also, this LCD
The panel 4 transmits the light from the laser oscillator 3 to the third
The amplitude distribution is modulated according to the image information of (3) to obtain the third information light. The third information light is made incident on the hologram 6 by the condenser lens 5.

On the other hand, a part of the laser beam before entering the LCD panel 4 is branched from the optical path of the laser beam by the beam splitter 32, and the mirrors 33, 34 ,.
After passing through 35, as the third reference light C, the hologram 6
Is incident on. The third reference light C corresponds to the third information light, and with respect to the hologram 6,
The light is incident at the third reference light incident angle.

Then, the third information light and the third reference light interfere with each other to form three pieces of reference image information in a striped pattern and are recorded on the hologram.

The angle of incidence of the third reference light corresponds to the angular position of the third photodetector 23 with respect to the hologram 6.

Further, with respect to the hologram 6, a fourth
In order to record the fourth reference image information corresponding to the reference posture D of, the CCD camera 2 first displays the fourth image information corresponding to the fourth reference posture D as shown in FIG. input.

Then, the CCD panel 4 has the fourth
The image corresponding to the image information of is displayed. Also, this LCD
The panel 4 transmits the light from the laser oscillator 3 to the fourth
The amplitude distribution is modulated in accordance with the image information of to obtain the fourth information light. The fourth information light is made incident on the hologram 6 by the condenser lens 5.

On the other hand, a part of the laser beam before entering the LCD panel 4 is branched from the optical path of the laser beam by the beam splitter 32, and the mirrors 33, 34 ,.
After passing through 35, as the fourth reference light D, the hologram 6
Is incident on. The fourth reference light D corresponds to the fourth information light, and with respect to the hologram 6,
The light is incident at the fourth reference light incident angle.

Then, the fourth information light and the fourth reference light interfere with each other to form four stripes of reference image information, which are recorded on the hologram.

The angle of incidence of the fourth reference light corresponds to the angular position of the fourth photodetector 24 with respect to the hologram 6.

The hologram 6 on which the first to the fourth reference image information are multiplexed and recorded in this manner is irradiated with ultraviolet rays to fix the respective reference image information.

A plurality of types of reference postures A, B, C, D
May be represented by the entire human body 1 or may be represented by a part of the human body 1.

As shown in FIG. 7, when the information light is incident on the hologram 6 on which a plurality of pieces of reference image information are recorded as described above through the LCD panel 4, the hologram 6 emits light. , A strong light is emitted in the direction of the reference light incident angle (the direction is opposite) when the standard image information corresponding to the standard posture that matches the posture shown by the image displayed on the LCD panel 4 in which the information light is modulated is recorded. Is emitted. Figure 7
Also, in order to make it easier to see, the direction of the light emitted from the hologram 6 is shown as being opposite to the actual direction.

When the LCD panel 4 displays an image showing a posture that matches the first reference posture A, light is emitted from the hologram 6 in the direction of the first reference light incident angle. To be done. The light thus emitted from the hologram 6 in the direction of the first reference light incident angle is received by the first photodetector 21.

Further, when the LCD panel 4 is displaying an image showing a posture that matches the second reference posture B, light is emitted from the hologram 6 in the direction of the second reference light incident angle. Is emitted. The light emitted from the hologram 6 in the direction of the second reference light incident angle in this manner is received by the second photodetector 22.

When the LCD panel 4 displays an image showing a posture that matches the third reference posture C, the hologram 6 emits light in the direction of the third reference light incident angle. Is emitted. The light thus emitted from the hologram 6 in the direction of the third reference light incident angle is received by the third photodetector 23.

Further, when the LCD panel 4 is displaying an image showing a posture corresponding to the fourth reference posture D, light is emitted from the hologram 6 in the direction of the fourth reference light incident angle. Is emitted. The light emitted from the hologram 6 in the direction of the fourth reference light incident angle in this manner is received by the fourth photodetector 24.

Then, when an image showing a posture close to any of the reference postures is displayed on the LCD panel 4, from the hologram 6, reference image information corresponding to the reference posture close to the posture shown by the image is displayed. The weak light is emitted in the direction of the reference light incident angle when is recorded. At this time, the intensity of the light emitted from the hologram 6 is
It changes depending on the closeness between the posture indicated by the image displayed on the LCD panel 4 and any one of the reference postures. Therefore, when an image showing a posture that does not match any of the reference postures is displayed on the LCD panel 4,
The hologram 6 emits weak light having substantially the same intensity in any direction.

That is, in this attitude detecting device,
According to the determination signal output from the maximum value detection circuit 7,
The postures of the human body 1 input as image information by the CCD camera 2 are the reference postures A, B, C, D.
Which of the two matches (or is closer to)
Can be detected.

The above-mentioned contents relate to the attitude detection device using a so-called reflection hologram in which the information light and the reference light at the time of recording respectively enter different sides of the hologram 6.

Needless to say, the attitude detecting device of the present invention can be constructed by using a so-called transmission hologram in which the information light and the reference light at the time of recording are incident on the same side of the hologram 6.

As shown in FIGS. 8 and 9, the attitude detecting device of the present invention is provided with an attitude information source 81 which serves as a reference attitude image output means and a signal processing circuit 8 which serves as a signal processing means. It can be configured as a device or a posture evaluation device.

In order to make it easier to see in FIGS. 8 and 9, as in the case of FIG. 1, the first to fourth photodetectors 21, 2 are also provided.
2, 23 and 24 and the maximum value detection circuit 7 are shown at positions on the opposite side to the actual arrangement with respect to the hologram 6.

In the game device shown in FIG. 8, the attitude information source 81 operates under the control of the signal processing circuit 8 to generate image signals corresponding to a plurality of types of reference attitudes recorded in the hologram 6. Then, this image signal is selectively output according to a predetermined game program. This image signal is sent to the monitor 9 serving as an image display means via the signal processing circuit 8. The monitor 9 displays an image according to the image signal sent via the signal processing circuit 8.

Then, the discrimination signal, which is a signal indicating which of the photodetectors 21, 22, 23 and 24 has detected the light emitted from the hologram 6, is sent to the signal processing circuit 8. , And a selection signal indicating the selection result of the reference attitude in the attitude information source 81 is transmitted.

The signal processing circuit 8 outputs a judgment signal based on the comparison and comparison between the judgment signal and the selection signal. For example, assume that the rules of the game are defined as follows.

“(1) In postures A and B, 50 points are scored when posture A wins. (2) In postures A and C, posture A wins and scores 50 points.
Earn points. (3) In Posture B and Posture C, 50 points are scored when Posture B wins.
Earn points. (4) In Posture B and Posture D, Got Posture B and score 50 points.
Earn points. (5) In posture C and posture D, the posture C wins and scores 10 points.
Get 0 points. (6) In posture D and posture A, the player wins posture D and scores 10 points.
Get 0 points.

The above is repeatedly executed a prescribed number of times (for example, 10 times) to compete for the acquired score. The game player of this game device selects one of the reference postures in accordance with the prescribed timing according to the progress of the game program, and selects the selected posture in front of the CCD camera 2. Take

Based on the discrimination signal, the signal processing circuit 8 determines that the attitude of the game player is the reference attitude A,
It is determined which of B, C, and D corresponds, and, on the other hand, the image signal selected according to the game program based on the selection signal and output from the attitude information source 81 has the plurality of types of reference attitudes A. , B, C, D is determined. Then, the signal processing circuit 8 determines whether the attitude of the game player and the attitude selected in accordance with the game program are successful. The result of this win / loss judgment is the above-mentioned judgment signal as the above-mentioned monitor 9
Sent to and displayed.

In the posture evaluation apparatus shown in FIG. 9, the posture information source 81 generates image signals corresponding to a plurality of types of reference postures recorded on the hologram 6,
This image signal is selectively output according to a predetermined program. This image signal is sent to the monitor 9. The monitor 9 displays an image according to the image signal sent from the attitude information source 81.

Then, the posture information source 81 sends to the signal processing circuit 8 a selection signal indicating which reference posture the image signal selected according to the program corresponds to. Further, the signal processing circuit 8 is sent with the discrimination signal which is a signal indicating which of the photodetectors 21, 22, 23 and 24 has detected the light emitted from the hologram 6. . Further, the signal processing circuit 8 is connected to a numerical value display section 82 for showing the evaluation result as a score.

The signal processing circuit 8 outputs a judgment signal based on the comparison and comparison between the judgment signal and the selection signal. For example, the image signal selected according to the above program is a series of posture changes (sequence) in dance and gymnastics.
Is shown. Then, the user of this posture evaluation device changes the posture in front of the CCD camera 2 while watching the display on the monitor 9 and following the posture displayed on the monitor 9.

Based on the discrimination signal, the signal processing circuit 8 determines that the posture of the user is the reference postures A, B, and
C or D is determined, and on the other hand, based on the selection signal, the image signal selected according to the program and output from the attitude information source 81 is the plurality of types of reference attitudes A, B, and It is determined which of C and D corresponds.

The signal processing circuit 8 outputs a determination signal when the determination signal and the selection signal match.
That is, the signal processing circuit 8 determines whether the posture of the user and the posture selected according to the program match. The number of times this judgment signal is output is counted in the signal processing circuit 8, converted into point information based on a predetermined coefficient, and displayed as the point on the numerical value display section 82.

[0070]

As described above, in the posture detecting apparatus according to the present invention, the amplitude distribution of the light from the light source is modulated according to the image information indicating the posture of the human body or each portion of the human body, and a plurality of reference image information are obtained. By irradiating a pre-recorded information recording medium, whether multiple reference postures match the posture of the human body or human body parts in a very short time without using a signal processing device capable of high-speed processing. It is possible to determine whether or not.

Therefore, by applying this posture detection device, it is possible to construct a game device and a posture evaluation device having a small and simple device configuration.

That is, according to the present invention, determining whether or not the posture of the human body or each posture of the human body matches any one of a plurality of preset and stored reference postures increases the size and complexity of the device configuration. Therefore, it is possible to provide a posture detection device that can be quickly and reliably carried out without any trouble.

[Brief description of drawings]

FIG. 1 is a side view schematically showing the configuration of a posture detection device according to the present invention.

FIG. 2 is a front view showing first to fourth reference postures recorded in the posture detection device.

FIG. 3 is a side view schematically showing a state in which image information of a first reference posture is recorded in the posture detection device.

FIG. 4 is a side view schematically showing a state in which image information of a second reference posture is recorded in the posture detection device.

FIG. 5 is a side view schematically showing a state in which image information of a third reference posture is recorded in the posture detection device.

FIG. 6 is a side view schematically showing a state in which image information of a fourth reference posture is recorded in the posture detection device.

FIG. 7 is a side view schematically showing the principle of image discrimination in the posture detection device.

FIG. 8 is a side view schematically showing the configuration of the posture detection device configured as a game device.

FIG. 9 is a side view schematically showing the configuration of the posture detection device configured as a posture evaluation device.

[Explanation of symbols]

1 human body, 2 CCD (solid-state image sensor) camera, 3 laser oscillator, 4 LCD (liquid crystal display) panel, 5 condenser lens, 6 hologram, 8 signal processing circuit, 9 monitor, 21 first photodetector, 22 2 photo detectors, 2
3 3rd photodetector, 24 4th photodetector, 81 Attitude information source

Claims (6)

[Claims] 1. A light source, an image input means for inputting a posture of a human body or each part of a human body as image information, and a space for modulating an amplitude distribution of light from the light source according to the image information input by the image input means. Modulating means, an information recording medium in which a plurality of reference image information are recorded in advance, optical means for making the information light modulated by the spatial modulating means incident on the information recording medium, and the information recording medium, respectively. A plurality of light detecting means for detecting light emitted from the information recording medium at different angular positions, and the reference image information recorded on the information recording medium is of a plurality of types inputted by the image input means. A plurality of types of information light whose amplitude distribution is modulated by the light from the light source in accordance with a plurality of types of image information corresponding to the reference posture are the optical And a plurality of reference lights corresponding to the information lights are incident on the information recording medium by the optical means, and the information lights and the reference lights corresponding to each other are formed by interference. The incident angle of each of the reference beams with respect to the information recording medium is
An attitude detecting device adapted to correspond to an angular position of each of the light detecting means with respect to the recording medium. 2. A reference posture image output means for selectively outputting image signals corresponding to a plurality of types of reference postures, and an image signal output from the reference posture image output means are sent to the reference posture image output means. An image display means for displaying an image, and a selection signal indicating which one of the light detection means has detected the light emitted from the information recording medium and a selection indicating the selection result of the reference attitude in the reference attitude image output means. The posture detection apparatus according to claim 1, further comprising a signal processing unit to which a signal is sent, wherein the signal processing unit outputs a determination signal based on a comparison and comparison between the determination signal and the selection signal. 3. The posture detection device according to claim 2, wherein the signal processing means outputs a determination signal when the determination signal and the selection signal match. 4. The posture detecting device according to claim 1, wherein the information recording medium is a volume hologram recording medium. 5. A step of inputting a posture image to a holographic element in which a plurality of reference posture images are recorded using reference beams having different incident angles, and when the posture image is input to the holographic element In the step of detecting the intensity and direction of the light emitted from the holographic element, from the detected intensity and direction of the light, the attitude image incident on the holographic element, the plurality of reference attitude image And a step of determining which one of them matches or does not match any of them. 6. A holographic element in which a plurality of reference attitude pixels are recorded using reference lights having different incident angles, a means for inputting an attitude image to the holographic element, and the attitude image for the holographic element. The means for detecting the intensity and direction of the light emitted from the holographic element when input to the graphic element, and the attitude image incident on the holographic element from the detected intensity and direction of the light, A posture detection device having means for determining which of a plurality of reference posture images matches or does not match any of them.