JP2007156325A - Information-presenting device, information-presenting method and program thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To project focused images on a plurality of corresponding projection planes, existing in a common projection area. <P>SOLUTION: A plurality of image projectors 1 for forming projection planes at different projection distances from a reference position, directed toward the common projection area are provided. The position calculating section 4 of the information presenting device 1 detects the position of the projection plane for an object existing in the projection area, from a photographing of image obtained from an imaging device 3. In addition, from a distance measurement device 9, a distance calculating section 10 obtains information about the distance of the object to the projection plane, and calculates the distance of the object from each image projector 1 based on the obtained distance information. Based on the calculated distance information, an image projector selecting section 5 selects among the image projectors, which has projection distance, corresponding to the distance of the object to the projection plane. Then, based on the position information of the projection plane for the object, obtained from the position calculating section 4, an image, input to the selected image projector 1 from an image holder 7, is projected on the projection plane provided for the object. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an information presentation apparatus, an information presentation method, and a program for presenting information on a projection plane using a projection apparatus.

  Currently, an environment for projecting images and providing information by a projection device such as a projector is being prepared. Therefore, in order to project an image to various locations, a technique for projecting an image that is not distorted on an uneven surface and a technique for displaying an image in a correct color on a colored projection surface such as a blackboard have been developed.

  Further, in an information presentation apparatus that projects an image by a projector, an information presentation apparatus that projects an image on a specific part of a user's body by detecting a specific part of the user's body has been invented (see, for example, Non-Patent Document 1). .)

Yoko Ishii, Satoshi Kobayashi, Akira Nakayama, Michi Hosoda, "Hand Display Interface for Directing Encounters with Information", Shingaku Technical Report, MVE-2005-42, Sep. 2005, The Institute of Electronics, Information and Communication Engineers, pp. 89-93

Yalin Xiong, Steven A. Shafer: “Depth from Focusing and Defocusing”, proceedings CVPR, pp. 68-73, New York City, 1993

  In the information presentation apparatus as described above, when a plurality of specific parts are detected and the images are projected when the distances from the projector to the specific parts are different, the focal point is out of focus at a certain part. For this reason, a blurred and unclear image may be displayed at a certain part.

  The present invention has been made paying attention to the above circumstances, and the object of the present invention is to be able to project a focused image on a plurality of projection planes existing in a common projection area. To provide a presentation apparatus, an information presentation method, and a program thereof.

  In order to achieve the above object, an information presentation apparatus, an information presentation method, and a program therefor according to the present invention provide information by a plurality of projection apparatuses that form projection planes at different projection distances from a reference position toward a common projection area. An information presentation device that projects and presents as an image, the detection means for detecting an object existing in the projection area, and the distance acquisition means for acquiring distance information from the reference position to the projection plane of the detected object Selection means for selecting a first projection apparatus having a projection distance corresponding to the distance to the projection plane of the object among the plurality of projection apparatuses based on the acquired distance information, and the selected first Projection control means for projecting the video toward the projection plane of the object is provided on one projection apparatus.

  In the above configuration, a projection apparatus having an optimum projection distance is selected with respect to the projection plane of the detected object. Therefore, according to the present invention, even when there are a plurality of projection planes in the projection area, a clear image in which each projection plane is in focus is presented. Thereby, for example, the visibility of characters and images projected by the projector can be improved.

The information presentation apparatus of the present invention is also characterized by having the following various configurations.
In the first configuration, the projection control unit determines whether or not a difference between a distance of the object to the projection surface and a projection distance of the selected first projection device exceeds a predetermined threshold value. And a brightness changing means for changing the brightness of each of the plurality of projection devices, and the determination means determines a difference between the distance to the projection surface of the object and the projection distance of the first projection device. A projection distance corresponding to the distance from the first projection device to the projection plane of the object, based on the acquired distance information. A second projection device is selected, and the brightness changing unit selects the first projection device and the second projection device according to a difference between a distance to the projection plane of the object and a projection distance of the selected projection device. Change the brightness of Projector 2 Unisuru.

  By configuring in this way, for example, when it is necessary to switch the projection device that projects an image while the projection plane of the object is dynamically moving from the first projection device to the second projection device, By projecting an image by gradually changing the luminance between the first projection device and the second projection device, it is possible to continue projecting a smooth image.

  In the second configuration, the projection control unit determines whether or not a difference between a distance of the object to the projection surface and a projection distance of the selected first projection device exceeds a predetermined threshold value. And a difference between a distance to the projection surface of the object and a projection distance of the first projection device by the determination unit. Projection that corresponds to the distance from the first projection device to the projection plane of the object next to the first projection device among the plurality of projection devices based on the acquired distance information. A second projection device having a distance is selected, and the first projection is performed by the chromaticity changing unit according to a difference between the distance to the projection plane of the object and the projection distance of the selected projection device. The chromaticity of the apparatus and the second projection apparatus Than is.

  By configuring in this way, for example, when it is necessary to switch the projection device that projects an image while the projection plane of the object is dynamically moving from the first projection device to the second projection device, By projecting an image by gradually changing the chromaticity between the first projection device and the second projection device, it is possible to continue projecting a smooth image.

According to a third configuration, the distance acquisition unit projects the identification image that can be identified for each of the plurality of projection devices toward the common projection area on the plurality of projection devices, and the plurality of projection devices. A captured image acquisition unit that acquires a captured image in which the common projection area is captured in a state in which the identification image is projected by a blur detection unit, and a blur detection unit that detects a degree of blur from the captured image. The distance information from the reference position to the projection plane of the detected object is acquired based on the condition.
This configuration does not require a new device such as a stereo camera or a sonic distance measuring device to measure the distance from the reference position to the projection surface of the detected object. It becomes possible to do.

According to a fourth configuration, the distance acquisition unit projects the identification image identifiable for each of the plurality of projection devices toward the common projection area on the plurality of projection devices, and the plurality of projection devices. A detection unit configured to acquire a captured image obtained by capturing the common projection area in a state in which the identification image is projected, and a contour detection unit configured to detect contour information of the identification image from the captured image. Based on the contour information thus obtained, distance information from the reference position to the projection plane of the detected object is acquired.
Even with this configuration, it does not require a new device such as a stereo camera or a sonic distance measuring device to measure the distance from the reference position to the projection surface of the detected object. It becomes possible to do.

  In short, according to the present invention, it is possible to provide an information presentation apparatus, an information presentation method, and a program thereof capable of projecting a focused image on a plurality of projection planes existing in a common projection area. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
In the first embodiment of the present invention, a plurality of projection devices that form projection surfaces at different projection distances from a reference position toward a common projection region are provided, and the information presentation device exists in the projection region. Detecting an object, calculating distance information from the reference position to the projection plane of the detected object, and projecting corresponding to the distance to the projection plane of the object among the plurality of projection devices based on the calculated distance information A projection device having a distance is selected.

FIG. 1 is a block diagram showing the configuration of the information presentation apparatus according to the first embodiment of the present invention.
The information presentation device 101 includes a position calculation unit 4, a video projection device selection unit 5, a plurality of video holding units 7, and a distance calculation unit 10. In addition, a plurality of video projection devices 1, an imaging device 3, and a distance measuring device 9 are connected to the information presentation device 101. Note that the same number of video holding units 7 as the video projection device 1 are provided. The plurality of video projectors 1 are installed so as to have different focal points, that is, different projection distances from a reference position toward a common projection area, and based on video data supplied from each video holding unit 7, An image is projected onto the common projection area. The imaging device 3 images the projection area of the video presented by the video projection device 1 and transmits the captured video data to the position calculation unit 4. The distance measuring device 9 measures the distance of the object detected from the distance measuring device 9 to the projection surface.

  The position calculation unit 4 of the information presentation device 101 performs differential processing on the video data supplied from the imaging device 3 and detects the number and size of projection planes formed by the object. The position calculation unit 4 obtains the moment of the detected projection plane and detects the center position of the object. The position calculation unit 4 transmits information on the number, size, and center position of the projection plane to the distance calculation unit 10 and the video projection device selection unit 5. Further, the distance calculation unit 10 receives distance information from the distance measurement device 9 to the projection plane of the object from the distance measurement device 9, and this distance information, the distance measurement device 9 obtained in advance and the plurality of video projection devices 1. The distance between each image projection device 1 from the projection surface of the object is calculated from the distance information between and. Then, the distance calculation unit 10 transmits the calculated distance information to the video projection device selection unit 5.

  The video projection device selection unit 5 has a difference (absolute value) between the distance from the video projection device to the video projection surface and the projection distance of the video projection device based on information sent from the position calculation unit 4 and the distance calculation unit 10. The smallest video projection apparatus is selected as the video projection apparatus that projects an image on the image projection plane. Then, the video projection device selection unit 5 transmits instruction information as to whether or not to project a video to each video projection device 1 via each video holding unit 7. When the video holding unit 7 receives an instruction to project a video from the video projection device selection unit 5, the video holding unit 7 transmits video information stored in advance together with the video projection command to each video projection device 1. Receiving the video projection instruction, the video projection device 1 projects the video toward the projection plane of the object designated at a preset projection distance.

FIG. 2 is a schematic configuration diagram illustrating an implementation example of the information presentation apparatus 101. The video projector 1 is mounted as four projectors 23, 24, 25, and 26. The projectors 23 to 26 are set to have different projection distances. For example, the projector 23 has the shortest projection distance, the projector 24 and the projector 25 have a gradually longer projection distance in order, and the projector 26 has the longest projection distance. When the respective projection distances are L1, L2, L3, and L4, each projection distance is expressed by the following expression.
L1 <L2 <L3 <L4
Further, as shown in the figure, the projectors 23 to 26 project an image toward the floor, and are installed so as to project an image in substantially the same area. In addition, it is assumed that the projector 26 having the longest projection distance is set so as to be focused on the floor surface.

  On the other hand, the position calculation unit 4, the distance calculation unit 10, and the video projection device selection unit 5 are implemented as a control program in a computer 21 such as a personal computer. Further, the same number of video holding units 7 as the projectors 23 to 26 are provided, and each of the video holding units 7 is mounted in the computer 22 as a control program. The projectors 23 to 26 are connected to the computer 22 and further connected between the computer 21 and the computer 22.

  In addition, a video camera 20 is used for the imaging device 3. The video camera 20 is connected to the computer 21 and is installed at a position where the entire area where the video is projected by the projectors 23 to 26 can be imaged. The distance measuring device 9 includes a twin-lens stereo camera 27 and is connected to the computer 21. The binocular stereo camera 27 obtains image information captured by two cameras at intervals, and the distance from the object can be measured by measuring an error of the image information, so-called parallax. Similarly to the video camera 20, the binocular stereo camera 27 is also installed at a position where the entire area where the images are projected by the projectors 23 to 26 can be imaged.

Next, the operation of the information presentation apparatus 101 configured as described above will be described. FIG. 3 is a flowchart showing the operation procedure of the information presentation apparatus 101 and its contents. In the present embodiment, the palm and floor of a human hand are targeted as the projection plane of the object on which the video is projected.
In step S3a, an image focused on the floor surface from the projector 26 is projected onto the entire projection range. In this state, when a person enters the projection range of the projectors 23 to 26 and puts out a palm on the projection surface of the projection distance of the projector 24, for example, the video is captured by the video camera 20 and input to the computer 21. .

  First, in step S3b, the computer 21 extracts a human body from the input captured video by background difference extraction processing. When the human body is extracted, the process proceeds to step S3c, and the computer 21 extracts the skin color area having a size satisfying a predetermined threshold from the extracted human body in the position calculation unit 4 to thereby extract the area. Is detected as a palm, and the size, position, and number of palms are obtained.

  Next, in step S3d, the binocular stereo camera 27 images the projection areas of the projectors 23 to 26 with the two cameras, and extracts the feature points of the obtained images, whereby the palm of the hand from the binocular stereo camera 27 is obtained. Measure the distance to. In step S3e, the distance from the reference position where the projectors 23 to 26 are installed to the palm position is calculated from the positional relationship between the binocular stereo camera 27 and the projectors 23 to 26, respectively. In step S3f, the computer 21 determines a projector to project an image by the image projection device selection unit 5 based on the calculated distance information. The image projection device selection unit 5 selects the projector 24 that projects the image on the palm as the projector 24 that minimizes the difference (absolute value) between the distance from the projector to the image projection plane, that is, the palm and the projection distance of the projector. .

  On the other hand, the computer 22 receives from the computer 21 information on the size and position of the palm on which an image is to be projected and selection information on the selected projector. In step S3g, the palm area is masked in the image holding unit 7 that supplies the image to the projector 26 that projects the image on the floor, and the image subjected to the masking process is projected on the projector 26. In step S3h, the computer 22 projects an image on the palm area from the projector 24 that has received the projection instruction. When the image is projected onto the palm of the hand, the image of the projector 24 is black so that the portion other than the palm region has a transparent background without being filled, and the image projected from the projector 24 protrudes from the palm and is projected from the projector 26. Do not overlap with the floor image.

  In step S3i, it is determined whether or not the detected palm is still present. If it is determined that there is a palm, the process proceeds to step S3d to repeat the above processing. When video is presented to all detected palms, the process proceeds to step S3j to determine whether to repeat the presentation process. The above process is repeated until an instruction to end the presentation process is notified in step S3j.

  As described above, in the first embodiment, a plurality of video projection devices 1 that form projection surfaces at different projection distances from the reference position toward the common projection region are provided, and the position calculation unit of the information presentation device 1 is provided. 4 detects the position of the projection plane of the object existing in the projection area from the captured image obtained from the imaging apparatus 3. Further, the distance calculation unit 10 acquires distance information from the distance measurement device 9 to the projection plane of the object, and calculates a distance from each video projection device 1 to the projection plane of the object based on the acquired distance information. To do. Based on the calculated distance information, the video projection device selection unit 5 selects a video projection device having a projection distance corresponding to the distance to the projection plane of the object from the plurality of video projection devices. Then, based on the position information of the projection plane of the object obtained from the position calculation unit 4, the video input from the video holding unit 7 is projected onto the projection plane of the object by the selected video projection device 1. ing.

Therefore, according to the first embodiment, a projection device having an optimum projection distance is selected with respect to the projection plane of the detected object. With this configuration, even when there are a plurality of projection planes in the projection area, a clear image in which each projection plane is in focus is presented. Thereby, for example, the visibility of characters and images projected by the projector can be improved.
In the first embodiment, the two computers 21 and 22 are used. However, the position calculation unit 4, the video projection device selection unit 5, the video holding unit 7, and the distance calculation unit are included in one computer. 10 may be implemented.

(Second Embodiment)
According to the second embodiment of the present invention, the information presentation apparatus described in the first embodiment further includes a luminance changing unit, so that, for example, when the image projection plane is moving, the information presentation apparatus is adapted to the moving distance. Thus, the brightness of the image projected from the image projection device is changed to project the image.
FIG. 4 is a block diagram showing an embodiment of the information presentation apparatus according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the part of the same structure as FIG. 1 of the said 1st Embodiment, and detailed description is abbreviate | omitted.

The information presentation device 102 includes a luminance change unit 6 in addition to the position calculation unit 4, the video projection device selection unit 5, the video holding unit 7, and the distance calculation unit 10 described in the first embodiment. .
The luminance changing unit 6 includes information indicating whether each video projection device 1 projects video from the video projection device selection unit 5, the position, size, number, and distance to the video projection device. Receive information. Based on the information sent from the video projection device selection unit 5, the brightness changing unit 6 is the difference (absolute value) between the distance from the video projection device that projects the video to the video projection surface and the projection distance of the video projection device. Is greater than or equal to a predetermined threshold, the brightness of the projected image is changed.

  In addition, the brightness changing unit 6 projects the image when the difference (absolute value) between the distance from the image projection device that projects the image to the image projection surface and the projection distance of the image projection device is equal to or greater than a predetermined threshold. Instruction information sent from the video projection device selection unit 5 so as to present a video from a video projection device having the next smallest difference (absolute value) between the distance from the device to the video projection surface and the projection distance of the video projection device. And the brightness of the projected image is changed. The brightness changing unit 6 transmits the determined brightness information and a command as to whether or not to present a video to the video holding unit 7. When the video holding unit 7 receives an instruction to present a video from the luminance changing unit 6, the video holding unit 7 changes the held video to the designated luminance and then transmits the video to the video projector 1. Receiving the video projection instruction, the video projection device 1 projects the video toward the projection plane designated at a preset projection distance.

  Next, the operation of the information presentation device 102 configured as described above will be described. FIG. 5 is a flowchart showing an operation procedure and contents of the information presentation apparatus 102. Further, the schematic configuration diagram shown in FIG. 2 is used as an implementation example of the information presentation apparatus 102. The brightness changing unit 6 is provided in the computer 21. In the present embodiment, human palms and floor surfaces are targeted as the projection planes of an object on which an image is projected, and the palm is between the projection plane formed by the projector 24 and the projection plane formed by the projector 25. In addition, it is assumed that the projection surface is formed closer to the projection surface formed by the projector 24 than the projection surface formed by the projector 25. In FIG. 5, the processes in steps S5a to S5e and steps S5k to S5l are the same as the processes in steps S3a to S3e and S3i to S3j in FIG. Now, the processing of steps S5f to S5h will be described in detail.

  In step S5f, it is determined whether or not the difference between the distance from the projector 24 to the projection surface and the projection distance of the projector 24 for the projector 24 selected by the video projection device selection unit 5 exceeds a predetermined threshold value. In this determination, when it is determined that the difference between the distance to the projection surface that is the palm and the projection distance does not exceed the predetermined threshold, the process proceeds to step S5h and the projector 24 selected by the video projector selection unit 5 is performed. Are determined as projectors that present video. On the other hand, if it is determined in step S5f that the difference between the distance to the projection surface and the projection distance exceeds a predetermined threshold value, the process proceeds to step S5g to perform luminance change processing.

Here, a detailed operation procedure of the luminance changing unit 6 will be described.
When the difference (absolute value) between the distance from the projector 24 to the palm selected by the video projection device selection unit 5 and the projection distance of the projector 24 is equal to or greater than a predetermined threshold value, the computer 21 As the difference (absolute value) between the distance to the palm and the projection distance of the projector 24 increases, an instruction to lower the brightness of the projected image is transmitted to the computer 22. At the same time, the computer 21 transmits to the computer 22 a command to change the brightness of another projector (here, the projector 25) having the next smallest difference (absolute value) between the distance from the projector to the palm and the projection distance of the projector. . The computer 21 transmits an instruction to the computer 22 to increase the brightness of the projected image as the difference (absolute value) between the distance from the projector 25 to the palm and the projection distance of the projector 25 decreases.

  That is, the computer 22 decomposes the images projected by the projectors 24 and 25 onto the projection plane into respective components by HSV conversion, and extracts luminance information that is a V component (Value of Brightness) from the components. And the image | video which changed the extracted V component is produced | generated, and it is set as the image | video which projects. An image with luminance 1 (= luminance of the original image: luminance 0 means a dark image with no luminance at all) is projected from the projector 24 to the palm at a position that exactly matches the projection distance of the projector 24. As the distance from the position that matches the projection distance of 24 gradually exceeds a predetermined threshold, the brightness of the image projected from the projector 24 onto the palm is reduced to 0.9, 0.8, and 0.7. go. At the same time, another projector 25 having the next smallest difference (absolute value) between the distance from the projector to the palm and the projection distance of the projector starts to project the same image onto the palm, and the brightness is set to 0.1, 0.2. , Gradually increase to 0.3. When the palm further approaches a position that matches the projection distance of the projector 25 and exceeds a certain threshold value, the projection of the image from the projector 24 is stopped, and the image of brightness 1 is projected from the projector 25 only onto the palm. When it is necessary to switch the projector that projects the image while the image projection plane is moving dynamically, it is possible to continue projecting a smooth image by projecting the image while changing the brightness in this way. And The brightness changes while satisfying the following formula.

At + Bt = 1
However, 0 ≦ | At | ≦ 1, 0 ≦ | Bt | ≦ 1
At: Brightness of the image projected from the projector A
Bt: Luminance of the image projected from the projector B The computer 22 is information on the size and position of the palm on which the image is to be projected from the computer 21, and instruction information indicating which luminance image is projected from which projector. Receive. In step S5i, the image holding unit 7 that supplies the image to the projector 26 that projects the image on the floor masks the palm area and causes the projector 26 to project the image that has been subjected to the masking process. In step S5j, the computer 22 projects the video with the brightness changed from the projectors 24 and 25 that have received the video projection instruction. When the image is projected onto the palm of the hand, the image of the projector 24 is black so that the part other than the palm region has a transparent background without being filled. Do not overlap with the floor image.

  As described above, in the second embodiment, the brightness changing unit 6 is provided in the information presentation apparatus 102, and the projection is performed when it is necessary to switch the projector that projects the image while the image projection plane is moving dynamically. By projecting an image by gradually changing the brightness with a projector that switches to a projector that is switching, it is possible to continue projecting a smooth image.

(Third embodiment)
The third embodiment of the present invention replaces the luminance changing unit of the information presentation apparatus described in the second embodiment with a chromaticity changing unit, for example, when the video projection plane is moving. The video is projected by changing the chromaticity of the video projected from the video projection device according to the distance.
FIG. 6 is a block diagram showing an embodiment of an information presentation apparatus according to the third embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the part of the same structure as FIG. 1 of the said 1st Embodiment, and detailed description is abbreviate | omitted.

The information presentation device 103 includes a chromaticity changing unit 11 in addition to the position calculating unit 4, the video projecting device selecting unit 5, the video holding unit 7, and the distance calculating unit 10 described in the first embodiment. Prepare.
The chromaticity changing unit 11 receives from the video projection device selection unit 5 instruction information on whether or not to project a video, the position, size and number of surfaces on which the video is projected, and distance information to the video projection device. Based on the information sent from the video projection device selection unit 5, the chromaticity changing unit 11 determines the difference (absolute value) between the distance from the video projection device that projects the video to the video projection surface and the projection distance of the video projection device. ) Is greater than or equal to a predetermined threshold, the chromaticity of the projected image is changed.

  Further, the chromaticity changing unit 11 is configured to display a video when a difference (absolute value) between a distance from a video projection device that projects a video to a video projection surface and a projection distance of the video projection device is equal to or greater than a predetermined threshold. An instruction sent from the video projection device selection unit 5 to present a video from a video projection device having the next smallest difference (absolute value) between the distance from the projection device to the video projection surface and the projection distance of the video projection device. Change the information and change the chromaticity of the projected image. The chromaticity changing unit 11 transmits the determined chromaticity information and an instruction as to whether or not to project a video to the video holding unit 7. When the video holding unit 7 receives an instruction to project a video from the chromaticity changing unit 11, the video holding unit 7 changes the held video to a designated chromaticity and transmits the video to the video projecting device 1. Receiving the video projection instruction, the video projection device 1 projects the video toward the projection plane designated at a preset projection distance.

  Next, the operation of the information presentation device 103 configured as described above will be described. FIG. 7 is a flowchart showing the operation procedure and contents of the information presentation device 103. In the present embodiment, human palms and floor surfaces are targeted as the projection planes of an object on which an image is projected, and the palm is between the projection plane formed by the projector 24 and the projection plane formed by the projector 25. In addition, it is assumed that the projection surface is formed closer to the projection surface formed by the projector 24 than the projection surface formed by the projector 25. In FIG. 7, the processes of steps S7a to S7e and steps S7k to S7l are the same as the processes of steps S3a to S3e and S3i to S3j of FIG. Now, the processing of steps S7f to S7h will be described in detail.

  In step S7f, it is determined whether or not the difference between the distance from the projector 24 to the projection plane and the projection distance of the projector 24 exceeds a predetermined threshold for the projector 24 selected by the video projection device selection unit 5. In this determination, when it is determined that the difference between the distance to the projection plane that is the palm and the projection distance does not exceed the predetermined threshold, the process proceeds to step S7h and the projector 24 selected by the video projector selection unit 5 is performed. Are determined as projectors that present video. On the other hand, if it is determined in step S7f that the difference between the distance to the projection surface and the projection distance exceeds a predetermined threshold, the process proceeds to step S7g to perform chromaticity change processing.

Here, a detailed operation procedure of the chromaticity changing unit 11 will be described.
When the difference (absolute value) between the distance from the projector 24 to the palm selected by the video projection device selection unit 5 and the projection distance of the projector 24 is equal to or greater than a predetermined threshold value, the computer 21 As the difference (absolute value) between the distance to the palm and the projection distance of the projector 24 increases, an instruction to lower the chromaticity of the projected image is transmitted to the computer 22. At the same time, the computer 21 sends a command to the computer 22 to change the chromaticity of another projector (here, the projector 25) having the next smallest difference (absolute value) between the distance from the projector to the palm and the projection distance of the projector. To do. The computer 21 transmits an instruction to the computer 22 to increase the chromaticity of the projected image as the difference (absolute value) between the distance from the projector 25 to the palm and the projection distance of the projector 25 decreases.

  That is, the computer 22 decomposes the images projected by the projectors 24 and 25 onto the projection plane into respective components by HSV conversion, and extracts chromaticity information that is the H component (hue: Hue) from the components. And the image | video which changed the extracted H component is produced | generated, and it is set as the image | video which projects. An image of the chromaticity of the original image is projected from the projector 24 to the palm at a position that exactly matches the projection distance of the projector 24, and as the palm gradually moves away from the position that matches the projection distance of the projector 24, the distance increases. When the distance exceeds a predetermined threshold, the chromaticity of the image projected from the projector 24 onto the palm is gradually lowered. The lower limit value is set to 0. At the same time, another projector 25 having the next smallest difference (absolute value) between the distance from the projector to the palm and the projection distance of the projector starts to project the same image onto the palm and gradually increases the chromaticity. The upper limit to be raised is up to the chromaticity value of the current image. When the palm further approaches a position that matches the projection distance of the projector B and exceeds a certain threshold value, the projector 24 stops projecting the image, and only the projector 25 projects the image having the chromaticity of the original image onto the palm. When it is necessary to switch the projector that projects the image because the image projection plane moves dynamically, it is possible to continue projecting a smooth image by projecting the image while changing the chromaticity in this way. And The chromaticity always indicates a positive value, and changes while satisfying the following formula.

Ai + Bi = I
However, 0 ≦ Ai ≦ 1, 0 ≦ Bi ≦ 1
I: Original chromaticity of the original image
Ai: chromaticity of the image projected from the projector A
Bi: Chromaticity of the image projected from the projector B The computer 22 represents information on the size and position of the palm from which the image is projected from the computer 21, and from which projector the chromaticity of the image is projected. Receive instruction information. In step S5i, the image holding unit 7 that supplies the image to the projector 26 that projects the image on the floor masks the palm area and causes the projector 26 to project the image that has been subjected to the masking process. Further, in step S7j, the computer 22 projects images with different chromaticities from the projectors 24 and 25 that have received the image projection instruction. When the image is projected onto the palm of the hand, the image of the projector 24 is black so that the part other than the palm region has a transparent background without being filled. Do not overlap with the floor image.

  As described above, in the third embodiment, when the chromaticity changing unit 11 is provided in the information presentation apparatus 102 and it is necessary to switch a projector that projects an image in a state where the image projection plane is dynamically moving, By projecting the image by gradually changing the chromaticity with the projector that switches to the projector that is projecting, it is possible to continue projecting a smooth image.

(Fourth embodiment)
In a fourth embodiment of the present invention, a distance to an object projection surface is measured using a sonic distance measurement device as a distance measurement device, and the distance between the image projection device and the object projection surface is measured from the measured distance information. The distance is calculated.
FIG. 8 is a schematic configuration diagram showing an embodiment of an information presentation apparatus according to the fourth embodiment of the present invention. In the present embodiment, the video projector 1 is implemented as projectors 41, 42, and 43. The projectors 41 to 43 are installed so as to have different projection distances from the reference position toward a common projection area. The projector 41 has the closest projection distance, and gradually has a longer projection distance with the projector 42 and the projector 43 in order. When the respective projection distances are L8, L9, and L10, each projection distance is expressed by the following expression.

L8 <L9 <L10
The projectors 41 to 43 are assumed to project an image toward the floor, and are installed so as to project an image in substantially the same area. Further, it is assumed that the projector 43 having the longest projection distance is set so as to be focused on the floor surface.

  On the other hand, the position calculation unit 4, the distance calculation unit 10, and the video projection device selection unit 5 are implemented as a control program in a computer 44 such as a personal computer. The same number of video holding units 7 as the projectors 41 to 43 are provided, and are installed in the computer 45 as a control program. The projectors 41 to 43 are connected to a computer 45 and further connected between the computer 44 and the computer 45.

  Further, a video camera 46 is used for the imaging device 3. The video camera 46 is connected to the computer 44 and installed at a position where the entire area where the video is projected by the projectors 41 to 43 can be imaged. The distance measuring device 9 uses a sound wave distance measuring device 47 using sound waves. The sonic distance measuring device 47 is installed at a position where the distance can be measured in the entire area where the images are projected by the projectors 41 to 43.

Next, the operation of the information presentation apparatus according to the fourth embodiment configured as described above will be described. FIG. 9 is a flowchart showing an operation procedure and contents of the information presentation apparatus. In the present embodiment, the palm and floor of a human hand are targeted as the projection plane of the object on which the video is projected.
In step S9a, the projector 43 projects an image focused on the floor surface over the entire projection range. In this state, an image is picked up within the projection range of the projectors 23 to 26, and the image is picked up by the video camera 46 and input to the computer 44.

  Next, in step S <b> 9 b, the calculator 44 detects the objects 48 and 49 by image processing from the input captured video in the position calculation unit 4, and obtains the size, position, and number of objects. In step S9c, the sonic distance measuring device 47 first generates a sonic wave toward the position of the object 48 obtained by the position calculating unit 4, and measures the reflection of the sound, thereby measuring the sonic distance measuring device 47 to the object 48. Measure the distance of each.

  Further, in step S9d, the distance from the reference position where the projectors 41 to 43 are installed to the position of the projection plane of the object 48 is calculated from the positional relationship between the sonic distance measuring device 47 and each of the projectors 41 to 43. In step S <b> 9 e, the computer 44 determines a projector to project an image by the image projection device selection unit 5 based on the calculated distance information. The image projection device selection unit 5 projects an image on the object 48 using the projector 41 that minimizes the difference (absolute value) between the projection plane of the object 48 from the projector, that is, the distance from the object 48 to the projection distance of the projector. Select as a projector.

  On the other hand, the computer 45 receives from the computer 44 information on the size and position of the object 48 on which an image is to be projected and selection information on the selected projector. In step S9f, the video holding unit 7 that supplies video to the projector 43 that projects video on the floor masks the area of the object 48 and causes the projector 43 to project the masked video. In step S9g, the computer 45 projects an image on the area of the object 48 from the projector 41 that has received the projection instruction. When the image is projected onto the object 48, the image of the projector 41 is black so that the part other than the area of the object 48 has a transparent background without filling, and the image projected from the projector 41 protrudes from the object 48. Do not overlap with the floor image projected from.

  In step S9h, it is determined whether or not there is still a detected object. If it is determined that there is an object, the process proceeds to step S9c and the above process is repeated. Here, as described above, an image is projected from the projector 42 onto the projection surface of the object 49. When video is presented to all detected objects, the process proceeds to step S9i to determine whether to repeat the presentation process. The above process is repeated until an instruction to end the presentation process is notified in step S9i.

In the fourth embodiment, a distance to the object projection surface is measured using the sonic distance measurement device 47 as the distance measurement device 9, and the distance between the image projection device 1 and the object projection surface is measured from the measured distance information. The distance is calculated. With this configuration, it is possible to measure the distance of the object to the projection plane without affecting the projected image.
In the fourth embodiment, the two computers 44 and 45 are used. However, the position calculation unit 4, the image projection device selection unit 5, the image holding unit 7, and the distance calculation unit are included in one computer. 10 may be implemented.

(Fifth embodiment)
In the fifth embodiment of the present invention, an illumination device is used as a distance measuring device to illuminate the projection surface of an object, and this state is the distance to the projection surface of the object based on illuminance information obtained from the captured image obtained by imaging Is calculated.
FIG. 8 is a schematic configuration diagram showing an embodiment of an information presentation apparatus according to the fifth embodiment of the present invention. In this embodiment, the same components as those in FIG. 8 of the fourth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. An illumination device 50 is used as the distance measuring device 9. The illuminating device 50 is installed at a position where the illumination can be applied in the entire area where the image is projected by the projectors 41 to 43.

  Next, the operation of the information presentation apparatus of the fifth embodiment configured as described above will be described. FIG. 11 is a flowchart showing an operation procedure and contents of the information presentation apparatus. In addition, in FIG. 11, since the process of step S11a-S11b and step S11e-S11i is the same as the process of step S9a-S9b of FIG. 9 in the said 4th Embodiment, and step S9e-S9i, description is abbreviate | omitted. Here, the processing of steps S11c to S11d will be described in detail.

  In step S <b> 11 c, the information presentation apparatus turns on the lighting device 50 from the position information of the objects 48 and 49 calculated by the position calculation unit 4. The video camera 46 captures the illuminance at the positions of the objects 48 and 49. The distance calculation unit 10 calculates the distances from the illumination device 50 to the objects 48 and 49 from the obtained illuminance information. Further, in step S11d, the distances between the projectors 41 to 43 and the objects 48 and 49 are derived from the positional relationship between the lighting device 50 and the projectors 41 to 43, respectively. The computer 44 determines a projector to project an image by the image projection device selection unit 5 from the distance information of the calculation result.

  In the fifth embodiment, an object projection plane is illuminated on the distance measuring device 9 using the illumination device 50, and the object projection plane is obtained based on illuminance information obtained from a captured image obtained by capturing this state with the video camera 46. The distance is calculated. With this configuration, it is possible to measure the distance of the object to the projection plane with a simple configuration.

(Sixth embodiment)
The sixth embodiment of the present invention uses blur detection technology instead of a distance measuring device, and causes a plurality of projection devices to project an identification image that can be identified for each projection device toward a common projection region, In this state, the degree of blur is detected from the captured image, and the distance to the projection plane of the object is calculated based on the detected degree of blur.
FIG. 12: is a schematic block diagram which shows one Embodiment of the information presentation apparatus concerning the 6th Embodiment of this invention. In this embodiment, the same components as those in FIG. 8 of the fourth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. A blur detector is used as the distance measuring device 9. The blur detection unit is implemented in the computer 44 as software. For the blur detection process, for example, a technique such as that described in Non-Patent Document 2 is used to determine the degree of blur by analyzing captured images.

  The distance measuring device 9 projects images of different colors from the projectors 41 to 43 at a time. The video camera 46 takes an image of the image projected onto the objects 48 and 49 and inputs it to the image projection device selection unit 5. The video projection device selection unit 5 performs blur detection processing for each color from this captured image, detects the clearest video among them, and selects a projector corresponding to the color of the video from the projector to the video projection surface. The projector is detected as the projector having the smallest difference (absolute value) between the distance and the projection distance of the projector.

  Next, the operation of the information presentation apparatus according to the sixth embodiment configured as described above will be described. FIG. 13 is a flowchart showing an operation procedure and contents of the information presentation apparatus. In FIG. 13, the processes of steps S13a to S13b and steps S13f to S13j are the same as the processes of steps S9a to S9b and steps S9e to S9i of FIG. Here, the processing of steps S13c to S13e will be described in detail.

  In step S <b> 13 c, the distance measuring device 9 is configured so that the computer 44 projects a grid-like image from the projectors 41 to 43 toward the position from the information of the objects 48 and 49 calculated by the position calculation unit 4. 45 is instructed. The computer 45 transmits the received information to the projectors 41 to 43, and the projectors 41 to 43 project grids of different colors toward the objects 48 and 49, respectively. This is shown in FIG.

  In step S <b> 13 d, the video camera 46 takes an image of the images projected on the objects 48 and 49. The computer 44 receives the video imaged by the video camera 46, performs blur detection processing for each color, and detects the video with the least blur. In step S13e, the video projection device selection unit 5 determines the projector that projects the video with the least blur on the object as the projector that projects the video on the object.

As described above, the sixth embodiment uses blur detection technology instead of the distance measurement device 9, and projects an identification image that can be identified for each device toward a common projection region on the plurality of video projection devices 1. In this state, the degree of blur is detected from an image captured by the video camera 46, and the distance to the projection plane of the object is calculated based on the detected degree of blur.
This configuration does not require a new device such as a stereo camera or a sonic distance measuring device to measure the distance from the reference position to the projection surface of the detected object. It becomes possible to do.

  In addition, this time, in order to increase the speed of the blur detection process, image processing is performed by projecting different colors at the same time for each projector instead of projecting each projector. In the present embodiment, in addition to colors, images of different shapes may be projected by each projector.

(Seventh embodiment)
The sixth embodiment of the present invention uses a contour detection technique instead of a distance measuring device, and causes a plurality of projection devices to project an identification image that can be identified for each projection device toward a common projection region, In this state, contour information is detected from the captured image, and the distance to the projection plane of the object is calculated based on the detected contour information.
FIG. 15: is a schematic block diagram which shows one Embodiment of the information presentation apparatus concerning 7th Embodiment of this invention. In the present embodiment, the video projector 1 is implemented as projectors 31, 32, and 33. The projectors 31 to 33 are installed so as to have different projection distances from the reference position toward a common projection area. The projector 31 has the closest projection distance, and gradually has a longer projection distance with the projector 32 and the projector 33 in order. When the respective projection distances are L5, L6, and L7, each projection distance is expressed by the following expression.

L5 <L6 <L7
The projectors 31 to 33 are assumed to project an image toward the floor, and are installed so that the images can be projected in substantially the same area. In addition, it is assumed that the projector 26 having the longest projection distance is set so as to be focused on the floor surface.

  On the other hand, the position calculation unit 4, the distance calculation unit 10, and the video projection device selection unit 5 are implemented as a control program in a computer 34 such as a personal computer. The video holding units 7 are provided in the same number as the projectors 31 to 33 and are installed in the computer 35 as a control program. The projectors 31 to 33 are connected to the computer 35 and further connected between the computer 34 and the computer 35.

  In addition, a video camera 36 is used for the imaging device 3. The video camera 36 is connected to the computer 34 and is installed at a position where the entire area in which the video is projected by the projectors 31 to 33 can be imaged. As the distance measuring device 9, the projectors 31 to 33 project images of a predetermined color and shape onto the projection plane, and measure the distance by measuring the outline of the image projected on each projection plane and the size of the image. The technique to be used is used.

In the present embodiment, the projection surfaces on which the image is projected are objects 37 and 38 having different positions, heights, and sizes, and the floor surface.
Next, the operation of the information presentation apparatus of the seventh embodiment configured as described above will be described. FIG. 16 is a flowchart showing an operation procedure and contents of the information presentation apparatus.

  In step S16a, the projector 33 projects an image focused on the floor surface on the entire screen. The video camera 36 captures an image within the projection range of the video and transmits the video to the computer 34. The computer 34 receives the video imaged by the video camera 36. Next, in step S <b> 16 b, the calculator 34 detects the objects 37 and 38 from the captured image by background difference extraction or color detection processing by the position calculation unit 4, and the size of the surface on which the object image is projected. Find the position, number. Then, the computer 34 transmits the calculation result data to the computer 35.

  In step S <b> 16 c, the computer 35 projects images in order by the projectors 31 to 33 toward the objects 37 and 38 based on the received data. In step S <b> 16 d, the video camera 36 captures an image of the image projected on the objects 37 and 38. Then, the computer 34 receives the video imaged by the video camera 36, and calculates the distance by the distance calculation unit 10 in step S16e.

  Specifically, an image obtained by capturing the projection images of the projectors 31 to 33 is received, and the edges of the images projected on the objects 37 and 38 projected from the projectors 31 to 33 are extracted. In step S16f, the computer 34 compares the edge extraction data of the image to be projected by the image projection device selection unit 5 with the edge extraction data of the image projected by each projector, and extracts the edge of the image to be projected. A projector having edge extraction data closer to the data is selected. With this configuration, no new device is required for distance measurement.

  On the other hand, the computer 35 receives from the computer 34 information on the size and position of the object 37 on which an image is to be projected, and selection information on the selected projector. In step S16f, the video holding unit 7 that supplies video to the projector 33 that projects video on the floor masks the area of the object 48 and causes the projector 33 to project the masked video. In step S16g, the computer 35 projects an image on the area of the object 37 from the projector 31 that has received the projection instruction. When the image is projected onto the object 37, the image of the projector 31 is black so that the part other than the region of the object 37 has a transparent background without being filled, and the image projected from the projector 31 protrudes from the object 37. Do not overlap with the floor image projected from.

  In step S16h, it is determined whether or not there is still a detected object. If it is determined that there is an object, the process proceeds to step S16c and the above process is repeated. Here, similarly to the above, an image is projected from the projector 32 onto the projection surface of the object 37. When video is presented for all detected objects, the process proceeds to step S16i to determine whether or not to repeat the presentation process. The above process is repeated until an instruction to end the presentation process is notified in step S16i.

In the seventh embodiment, contour detection technology is used instead of the distance measuring device 9, and the plurality of video projecting devices 1 project identification images that can be identified for each device toward a common projection area, In this state, contour information is detected from a captured image captured by the video camera 46, and the distance to the projection plane of the object is calculated based on the detected contour information.
Even with this configuration, it does not require a new device such as a stereo camera or a sonic distance measuring device to measure the distance from the reference position to the projection surface of the detected object. It becomes possible to do.

  In the seventh embodiment, the two computers 34 and 35 are used. However, the position calculation unit 4, the video projection device selection unit 5, the video holding unit 7, and the distance calculation unit are included in one computer. 10 may be implemented. In addition, the projectors 31 to 33 are configured to project images of predetermined colors and shapes in order onto the projection surface of the object, but this state is obtained by projecting different identification images for each projector at a time. The contour information of each projector may be detected from the captured image. In this way, the distance to the projection plane of the object can be calculated in a short time.

  The present invention is not limited to the above embodiments. The information presentation apparatus of the present invention can be realized by a computer and a program, and can be recorded on a recording medium or provided through a communication network. In addition, the configuration of the information presentation device, the operation procedure of each unit, and the contents thereof can be variously modified and implemented without departing from the scope of the present invention.

  In short, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The block block diagram which shows one Embodiment of the information presentation apparatus concerning 1st Embodiment of this invention. The schematic block diagram which shows the example of mounting of the information presentation apparatus shown in FIG. The flowchart which shows the operation | movement procedure of the information presentation apparatus shown in FIG. The block block diagram which shows one Embodiment of the information presentation apparatus concerning 2nd Embodiment of this invention. The flowchart which shows the procedure of the operation | movement of the information presentation apparatus shown in FIG. 4, and its content. The block block diagram which shows one Embodiment of the information presentation apparatus concerning the 3rd Embodiment of this invention. The flowchart which shows the operation | movement procedure of the information presentation apparatus shown in FIG. 6, and its content. The schematic block diagram of the information presentation apparatus concerning the 4th Embodiment of this invention. The flowchart which shows the operation | movement procedure of the information presentation apparatus shown in FIG. The schematic block diagram of the information presentation apparatus concerning the 5th Embodiment of this invention. The flowchart which shows the operation | movement procedure of the information presentation apparatus shown in FIG. The schematic block diagram of the information presentation apparatus concerning the 6th Embodiment of this invention. The flowchart which shows the operation | movement procedure of the information presentation apparatus shown in FIG. The figure which shows a mode that the image | video was projected on the object from the information presentation apparatus shown in FIG. The schematic block diagram of the information presentation apparatus concerning the 7th Embodiment of this invention. The flowchart which shows the operation | movement procedure of the information presentation apparatus shown in FIG. 15, and its content.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Information presentation apparatus, 1 ... Video projection apparatus, 3 ... Imaging apparatus, 4 ... Position calculation part, 5 ... Video projection apparatus selection part, 7 ... Video holding part, 9 ... Distance measurement apparatus, 10 ... Distance calculation part, 20 ... Video camera, 21, 22 ... Computer, 23, 24, 25, 26 ... Projector, 27 ... Binocular stereo camera, 6 ... Luminance changing unit, 7 ... Chromaticity changing unit, 41, 42, 43 ... Projector, 44, 45: Computer, 46: Video camera, 47, Sonic distance measuring device, 48, 49 ... Object, 50 ... Illumination device, 31, 32, 33 ... Projector, 34, 35 ... Computer, 36 ... Video camera, 37, 38 ... object.

Claims (9)

An information presentation device that projects and presents information as images by a plurality of projection devices that form projection planes at different projection distances from a reference position toward a common projection region,
Detecting means for detecting an object present in the projection area;
Distance acquisition means for acquiring distance information from the reference position to the projection surface of the detected object;
Selection means for selecting a first projection device having a projection distance corresponding to the distance to the projection surface of the object, among the plurality of projection devices based on the acquired distance information;
An information presentation apparatus comprising: a projection control unit configured to project the video toward the projection plane of the object on the selected first projection apparatus.   The projection control unit includes a determination unit that determines whether or not a difference between a distance of the object to the projection plane and a projection distance of the selected first projection device exceeds a predetermined threshold; Brightness change means for changing the brightness of each of the projection devices, and the determination means determines that the difference between the distance of the object to the projection surface and the projection distance of the first projection device exceeds a predetermined threshold value. A second projection device having a projection distance corresponding to a distance from the first projection device to the projection surface of the object, based on the acquired distance information. Brightness of the first and second projection devices by the brightness changing means according to the difference between the distance to the projection surface of the object and the projection distance of the selected projection device. It is characterized by changing Information presentation apparatus according to claim 1.   The projection control unit includes a determination unit that determines whether or not a difference between a distance of the object to the projection plane and a projection distance of the selected first projection device exceeds a predetermined threshold; Chromaticity changing means for changing the chromaticity of the projection apparatus, respectively, and the difference between the distance to the projection surface of the object and the projection distance of the first projection apparatus exceeds a predetermined threshold by the determination means. A second projection distance corresponding to a distance from the first projection device to the projection plane of the object based on the acquired distance information. A projection device is selected, and the first projection device and the second projection are selected by the chromaticity changing means according to a difference between a distance of the object to the projection surface and a projection distance of the selected projection device. It is characterized by changing the chromaticity of the device. Information presentation apparatus according to claim 1. The distance acquisition unit projects the identification image that can be identified for each of the plurality of projection devices toward the common projection area on the plurality of projection devices, and the identification image is projected by the plurality of projection devices. A captured image acquisition unit that acquires a captured image in which the common projection area is captured in a state in which the common projection region is captured, and a blur detection unit that detects a degree of blur from the captured image,
The information presentation apparatus according to claim 1, wherein distance information from the reference position to the projection plane of the detected object is acquired based on the detected degree of blur. The distance acquisition unit projects the identification image that can be identified for each of the plurality of projection devices toward the common projection area on the plurality of projection devices, and the identification image is projected by the plurality of projection devices. A captured image acquisition unit that acquires a captured image in which the common projection area is captured in a state of being captured, and a contour detection unit that detects contour information of an identification image from the captured image,
The information presentation apparatus according to claim 1, wherein distance information from the reference position to the projection plane of the detected object is acquired based on the detected contour information. Used in an information presentation device that projects and presents information as a video by a plurality of projection devices that form projection planes at different projection distances from a reference position toward a common projection region,
A detection step of detecting an object present in the projection region;
A distance acquisition step of acquiring distance information from the reference position to the projection plane of the detected object;
A selection step of selecting a first projection device having a projection distance corresponding to a distance to the projection plane of the object, among the plurality of projection devices, based on the acquired distance information;
A projection control step of causing the selected first projection device to project the video toward the projection plane of the object. The projection control step includes a determination step of determining whether a difference between a distance of the object to the projection surface and a projection distance of the selected first projection device exceeds a predetermined threshold value, A brightness changing step for changing the brightness of the projection device,
When the determination step determines that the difference between the distance of the object to the projection surface and the projection distance of the first projection device exceeds a predetermined threshold, A second projection device having a projection distance corresponding to a distance from the first projection device to the projection plane of the object is selected from among the plurality of projection devices, and the distance to the projection plane of the object; 7. The information presentation according to claim 6, wherein the luminance of the first projection device and the second projection device is changed by the luminance change step according to a difference with a projection distance of the selected projection device. Method. The projection control step includes a determination step of determining whether a difference between a distance of the object to the projection surface and a projection distance of the selected first projection device exceeds a predetermined threshold value, A chromaticity change step for changing the chromaticity of the projection device,
When the determination step determines that the difference between the distance of the object to the projection surface and the projection distance of the first projection device exceeds a predetermined threshold, A second projection device having a projection distance corresponding to a distance from the first projection device to the projection plane of the object is selected from among the plurality of projection devices, and the distance to the projection plane of the object; The chromaticity of the first projection device and the second projection device is changed by the chromaticity changing step according to a difference with a projection distance of the selected projection device. Information presentation method. A program used in an information presentation apparatus including a computer that projects and presents information as a video by a plurality of projection apparatuses that form projection planes at different projection distances from a reference position toward a common projection area,
A detection process for detecting an object present in the projection area;
Distance acquisition processing for acquiring distance information from the reference position to the projection surface of the detected object;
A selection process for selecting a projection device having a projection distance corresponding to the distance to the projection surface of the object from the plurality of projection devices based on the acquired distance information;
A program that causes the computer to execute a projection control process that causes the selected projection device to project the video toward a projection plane of the object.

Images