JP2009124681A - Projector and projection display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector and a projection display method capable of obtaining a projection image having a predetermined size even when the distance from a subject changes. <P>SOLUTION: The projector includes: an image pickup unit 2 which obtains an image of a subject; an image signal processing unit 3 which cuts an image corresponding to a projection display area of the subject contained in an image obtained by the image pickup unit 2, and processes an image signal such that the cut image has a predetermined size to produce a projection image signal; and a projection unit 4 which produces an image according to the image signal produced by the image signal processing unit 3 and projects the image. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projector and a projection display method, and more particularly to control of the size of a projected image.

2. Description of the Related Art Conventionally, a projector provided with an imaging means includes, for example, a “shooting camera for picking up an image of a subject 6 and this shooting camera arranged on the bottom side, converting a video signal from the shooting camera into video light, and a projection lens And a projector main body 2 that magnifies and projects through 3 so that a subject placed on the bottom surface side of the projector main body 2 can be imaged (see, for example, Patent Document 1).
JP 2003-15216 A (summary, FIG. 1)

  In the projector described above, if the distance between the camera and the subject is constant, the size of the image is constant when the subject image is projected onto the screen. For example, a display screen of a mobile phone or the like is captured and projected onto the screen. In this case, the video size varies depending on the size of the mobile phone, and the distance and the rate of expansion vary depending on the installation location. Although it is possible to adjust this manually, there is a problem that the operation is troublesome.

  The present invention has been made to solve such problems, and provides a projector and a projection display method capable of obtaining a projection image of a predetermined size even when the distance to the subject changes. With the goal.

  The projector according to the present invention cuts out an image corresponding to the projection display area of the subject from the image pickup unit that picks up the subject, and the image picked up by the image pickup unit, and the cut out image has a predetermined size. Video signal processing means for processing the video signal to generate a video signal for projection, and projection means for generating a video based on the video signal generated by the video signal processing means and projecting the video. It is a thing. In the present invention, the video signal processing means cuts out the video corresponding to the video in the projection display area of the subject from the video taken by the imaging means, and the video so that the cut out video has a predetermined size. Since the signal is processed to generate a video signal for projection (scaling process), and the projection means projects the video based on the video signal, a projected video of a predetermined size can be obtained even if the distance to the subject changes. can get.

  The projector according to the present invention further includes a distance measuring unit that measures a distance to the subject, and the video signal processing unit determines the size of the video of the subject or the video based on the distance information measured by the distance measuring unit. A video signal indicating the pixel size of the signal is generated, the video signal is combined with the cut-out video signal, and the projection video signal is generated based on the combined video signal. In the present invention, based on the distance information measured by the distance measuring means, a video signal indicating the size of the video of the subject or the size of the pixel of the video signal is generated, and the video signal is cut out. And a projection video signal is generated on the basis of the synthesized video signal and projected onto a screen or the like for display. For this reason, the projection display area of the subject is displayed in a predetermined size regardless of the size and the distance to the subject, but information indicating the size of the subject image is displayed, so the size of the subject is displayed. It is possible to grasp.

  The projector according to the present invention inputs a video signal of a subject, cuts out a video corresponding to the projection display area of the subject from the video based on the video signal, and the video so that the cut-out video has a predetermined size. Video signal processing means for processing a signal to generate a video signal for projection, and projection means for generating a video based on the video signal generated by the video signal processing means and projecting the video is there. In the present invention, the video signal processing means inputs, for example, a video signal of a subject imaged by an external imaging means, and cuts out a video corresponding to the video in the projection display area of the subject from the video signal, The video signal is processed so that the cut-out video has a predetermined size to generate a video signal for projection (scaling processing), and the projection means projects the video based on the video signal. Even if the distance to the projector changes, a projection image of a predetermined size can be obtained.

  In the projector according to the aspect of the invention, the video signal processing unit inputs distance information indicating a distance to the subject, and an image indicating the size of the video of the subject or the size of the pixel of the video signal based on the distance information. A signal is generated, the video signal is combined with the cut out video signal, and the projection video signal is generated based on the combined video signal. In the present invention, the projection display area of the subject is displayed in a predetermined size regardless of the size and the distance to the subject, but information indicating the size of the subject image is displayed. It is possible to grasp the size.

  The projection display method according to the present invention includes a step of imaging a subject by an imaging unit, a step of cutting out a video corresponding to an arbitrary area among videos captured by the imaging unit, and the cut out video is a predetermined video A process of generating a video signal for projection by processing the video signal to have a size, and a process of generating a video based on the video signal for projection and projecting the video on a screen is there. In the present invention, since an image of an arbitrary area is cut out, for example, manually or automatically, the cut out image is a video of a predetermined size on a screen or the like regardless of the distance to the subject. Is displayed.

  The projection display method according to the present invention includes a step of inputting a video signal of a subject, a step of cutting out a video corresponding to a projection display region of the subject or an arbitrary region from the video based on the video signal, and the cut out video Processing to generate a video signal for projection by processing the video signal so as to have a predetermined size, and generating a video based on the video signal for projection and projecting the video on a screen. It is a thing. In the present invention, for example, an image of an arbitrary area is extracted from an image based on an image signal captured from the outside, for example, manually or automatically, so that the extracted image is related to the distance to the subject. Instead, it is displayed as an image of a predetermined size on a screen or the like.

Embodiment 1. FIG.
FIG. 1 is a block diagram showing a configuration of a projector according to Embodiment 1 of the present invention.
The projector 1 includes an imaging unit 2, a video signal processing unit 3, and a projection unit 4. The image pickup means 2 is composed of, for example, a CCD camera or the like, picks up a subject and outputs the video signal to the video signal processing means 3. The video signal processing unit 3 performs signal processing (details will be described later) on the video signal from the imaging unit 2 and outputs the video signal to the projection unit 4. The projection unit 4 includes, for example, a light source, a liquid crystal light valve (or DMD (registered trademark): digital micromirror device), a projection optical system, and the like. It is generated and projected onto the screen SC to display the subject.

  Further, the projector 1 includes a control unit 5, a storage device 6, a distance measuring unit 7, an operation panel 8, and an operation signal processing unit 9. The control unit 5 controls the entire projector 1 including the video signal processing means 3 described above, and performs various signal processing based on programs, data, and the like stored in the storage device 6. The distance measuring means 7 measures the distance to the subject, and for example, a distance meter using laser light or infrared light is used. The distance information measured by the distance measuring means 7 is supplied to the control unit 5. The control unit 5 transfers the distance information to the video signal processing means 3. The operation signal generated by operating the operation panel 8 is signal-processed by the operation signal processing unit 9 and input to the control unit 5, and the control unit 5 performs various signal processing based on the operation signal.

  FIG. 2 is a block diagram showing a detailed configuration of the video signal processing means 3. The video signal processing unit 3 includes a frame memory 21, a video cutout circuit 22, and a frame memory 23 as a configuration for processing the video signal from the imaging unit 2. In addition, as a configuration for adding information about the size of the subject to the video imaged by the imaging unit 2, the arithmetic unit 24, the ROM 25, the ROM 26, and the OSD (on-screen display) circuit 27 are provided. Is scaled by the scaler 28 and output to the projection unit 4.

  Further, the video signal from the imaging means 2 is developed in the frame memory 21. The video cutout circuit 22 takes in the video signal developed in the frame memory 21 and detects the edge portion of the video (for example, when the video projection portion corresponds to a portion surrounded by the edge portion of the video). Then, the video signal surrounded by the edge portion is cut out and developed in the frame memory 23. On the other hand, when the calculation unit 24 acquires the distance information, it fetches the size information for one pixel corresponding to the distance information from the ROM 25 (see FIG. 3 to be described later in detail), and the OSD stored in the ROM 26 based on the size information. The data is output to the OSD circuit 27. The OSD circuit 27 outputs to the scaler 28 a video signal synthesized by superimposing OSD data on the video signal from the frame memory 23.

  FIG. 3 shows a data table stored in the ROM 25 of the video signal processing means 3, in which data about the scan range (imaging range, W × L) and the size for one pixel with respect to the distance h is stored. ing. In the data table of FIG. 3, the distance h is a discrete value. However, when the measured distance does not match the distance h of the data table, the calculation unit 24 performs an interpolation process for one pixel. The size is to be calculated.

  4A and 4B are a perspective view of the mobile phone 31 as a subject and an explanatory diagram showing a state when the mobile phone 31 is imaged by a projector and the image is projected. For example, the mobile phone 31 is placed on a lower base 32a of an H-shaped mounting base 32, and the projector 1 is placed on the upper base 32b. An elevating mechanism 32d for elevating the upper table 32b is attached to the central member 32c of the mounting table 32, and the distance h between the display screen 31a of the mobile phone 31 that is the subject and the imaging means 2 of the projector 1 is provided. Is adjustable.

Next, the operation of the projector 1 having the above configuration will be described.
FIG. 5 is an explanatory diagram showing the transition of the video until the video imaged by the imaging means 2 is output from the scaler 28.
When the projector 1 is placed in the state shown in FIG. 4B, the imaging means 2 images the display screen 31a of the mobile phone 31 that is the subject, and the image is expanded in the frame memory 21, FIG. ) Is obtained. Of the video 50 in FIG. 5A, an area indicated by reference numeral 51 is an image corresponding to the display screen 31a (projection display area) of the mobile phone. It is assumed that the scan range (imaging range) by the imaging unit 2 at this time is W: 100 and L: 100. The video cut-out circuit 22 takes in the video signal developed in the frame memory 21, detects the edge portion of the video (that is, detects the edge 51 of the display screen of the mobile phone), and includes the edge. A video signal corresponding to the video is cut out and developed in the frame memory 23. At this time, an image as shown in FIG. 5B is obtained in the frame memory 23. Assume that the size of the video at this time is, for example, W: 50 and L: 50. The video signal cut-out process is performed by detecting a brightness or color change portion as an edge portion. Note that a certain amount of margin may be provided when performing this cutout. In addition, when there are a plurality of edge portions of the video, it may be performed after the operation panel 8 sets in advance in the storage device 6 which edge is detected. The video cut-out circuit 22 can grasp the overall size of the video and the size of the cut-out video, that is, knows how many times the cut-out video should be increased. The magnification information indicating whether or not there is is output to the scaler 28. In the previous example, both the vertical and horizontal directions are doubled, so the information of double the vertical and horizontal directions is output to the scaler 28.

  On the other hand, when the calculation unit 24 inputs the distance information from the distance measuring means 7, the size of one pixel corresponding to the distance h is read from the ROM 25, and the OSD data corresponding to the size is read from the ROM 26 to the OSD circuit. 27 to output. The OSD circuit 27 superimposes the OSD data on the video signal from the frame memory 23 and outputs it to the scaler 28. An image corresponding to the output (video signal) of the OSD circuit is as shown in FIG. 5C, and size information (in this example, 1 cm) indicating the size of the image is displayed in the video signal from the frame memory 23. The video showing the size) is overlaid. The scaler 28 scales the video signal output from the OSD circuit 27 based on at least the magnification information from the video cutout circuit 22 and outputs a video signal corresponding to the video as shown in FIG. 4 is output. In this example, the output of the OSD circuit 27 is doubled both vertically and horizontally, and the OSD data is also doubled both vertically and horizontally.

  FIG. 6 is an explanatory diagram showing the relationship between the distance between the projector 1 and the mobile phone 31 and the projected video. As shown in FIG. 9A, the image of the subject at the distance h1 is displayed in the area indicated by A1. When the distance h1 is changed to h2 (h1 <h2), the distance h1 is displayed in the area A2 as shown in (b) of FIG. However, in the present embodiment, by processing the video with the video magnification information corresponding to the projection distance, the video is displayed in the area A3 as shown in (b) of FIG. An image having the same size as that in the case of FIG. In addition, this means that an image of the same size is projected on the screen regardless of the size of the subject. In this embodiment, the dimensions are as shown in FIG. In addition, the user can display the information indicating the size of the subject.

  As described above, in this embodiment, the video corresponding to the video on the display screen (projection display area) of the mobile phone 31 as the subject among the video specified by the video signal from the image pickup means 2 by the video cutting circuit 22. The signal is cut out, the scaler 28 processes the video signal so that the video of the cut out video signal has a predetermined size, and generates a video signal for projection. The projection unit 4 generates the video based on the video signal. Since it is generated and projected and displayed on the screen SC, it is possible to always obtain a projected image of the subject having a predetermined size even if the distance between the subject and the imaging means 2 changes.

  Further, the distance measuring means 7 measures the distance to the subject, the calculation unit 24 generates a video signal indicating the size of the video pixel based on the distance information, and the OSD circuit 27 extracts the video signal and the video signal. The scaler 28 generates a projection video signal based on the combined video signal, and the projection unit 4 generates a video based on the video signal and projects it onto the screen SC. Since it is displayed, it is possible to grasp the size of the projected subject video.

Embodiment 2. FIG.
In the first embodiment, the video extracting circuit 22 automatically performs the process of developing the video in the frame memory 23. However, the clipping process may be performed manually. In that case, the video in the frame memory 21 is initially developed as it is in the frame memory 23 and the video is projected. However, the user operates the operation panel 8 while viewing the video, and any area or When an operation for clipping a video in a preset projection display area is performed, the operation signal is input to the video clipping circuit 22 of the video signal processing means 3 via the operation signal processing unit 9 and the control unit 5 (see FIG. 2), the video cutout circuit 22 cuts out the video signal of the frame memory 21 based on the operation signal and develops it in the frame memory 23. The image developed in the frame memory 23 is adjusted in size by the scaler 28 and output to the projection unit 4 as in the above embodiment, and the clipped image is displayed on the screen SC. The size of the image becomes a constant size regardless of the distance to the subject. The description of the second embodiment is similarly applied to later-described fourth to sixth embodiments.

Embodiment 3. FIG.
In the first embodiment, it has been described that laser light or infrared light is used as the distance measuring unit. However, the distance to the subject may be measured by detecting the amount of elevation of the elevation mechanism 32d in FIG. 4B.
In the data table of FIG. 3, an example of storing data of one pixel size has been described, but in the present invention, the size of an arbitrary pixel unit such as 10 pixels, 100 pixels, 1000 pixels, etc. You may make it store as data.
In the first embodiment, the example of displaying the magnification information indicating the size of the pixel has been described. However, since the size of the captured subject can be grasped, a video signal that directly represents the size of the subject is generated. May be displayed. Furthermore, the display mode is not necessarily the mode shown in FIG. 5D, and for example, articles having known sizes may be displayed side by side.
In the first embodiment, the example of the display screen of the mobile phone 31 is described as the projection display area. However, the entire mobile phone 31 may be the projection display area. In addition, the subject is not limited to the mobile phone 31 and is changed as required by the user. Note that the description of the third embodiment is also appropriately applied to the later-described fourth to sixth embodiments.

Embodiment 4 FIG.
FIG. 7 is a block diagram showing a configuration of the projector according to the fourth embodiment of the invention. In contrast to the first embodiment shown in FIG. 1, the projector 1 does not include the imaging unit 2 and the distance measuring unit 7, and takes in the video signal from the imaging unit 62 of the external document camera 60. Is different. Hereinafter, this difference will be mainly described.

  The video signal of the imaging means 62 of the document camera 60 is supplied to the video signal processing means 3 of the projector 1. The interface at this time is, for example, a video signal, RGB (red / green / blue), HDMI (High-High). Definition Multimedia Interface: High-definition multimedia interface), USB (Universal Serial Bus), wired / wireless LAN (Local Area Network), etc.

  The video signal processing means 3 has the configuration shown in FIG. 2 (this is the same in Embodiments 5 and 6 to be described later), and the video signal from the imaging means 62 of the document camera 60 is implemented as described above. Processing is performed in the same manner as in the embodiment (however, processing by the distance h from the distance measuring means 7 is excluded). That is, the outline thereof will be described with reference to the video signal processing means 3 in FIG. 2. The video signal from the imaging means 62 is developed in the frame memory 21, and the video cutout circuit 22 is developed in the frame memory 21. Among them, a video corresponding to the projection display area of the subject is cut out and developed in the frame memory 23, and magnification information is output to the scaler 28. Then, the scaler 28 scales the video expanded in the frame memory 23 based on the magnification information. By such processing, the video transition as shown in FIGS. 5A to 5E is performed, and the video as shown in FIG. 5D (however, in this case, the video “1 cm” with the distance h). Is output to the projection unit 4, and the projection unit 4 generates an image based on the image signal and projects it on the screen SC (in this case, depending on the distance h). The portion of the image “1 cm” is not projected.)

  As described above, in the fourth embodiment, since the projector 1 takes in the video signal from the document camera 60 and generates and projects the video, the projector 1 does not include the image pickup unit. A projection image similar to that of the first embodiment is obtained.

Embodiment 5. FIG.
FIG. 8 is a block diagram showing the configuration of the projector according to the fourth embodiment of the invention. This projector 1 is different from the first embodiment of FIG. 1 in that the external document camera 60 includes a distance measuring means 67 in addition to the imaging means 62 in contrast to the fourth embodiment of FIG. In contrast, the projector 1 does not incorporate the image pickup means 2 and the distance measurement means 7, but takes in video signals and distance information from the image pickup means 62 and distance measurement means 67 of the external document camera 60. The point is different.

  The distance information from the distance measuring means 67 of the document camera 60 is supplied to the control unit 5 of the projector 1, and the interface at this time is, for example, HDMI (High-Definition Multimedia Interface), By USB (Universal Serial Bus), wired / wireless LAN (Local Area Network), etc.

  The video signal processing unit 3 processes the video signal from the imaging unit 62 of the document camera 60 in the same manner as in the first embodiment. Then, after the transition of the video as shown in FIGS. 5A to 5E, the video signal corresponding to the video as shown in FIG. 5D is output to the projection unit 4, and the projection unit 4 A video based on the video signal is generated and projected onto the screen SC.

  As described above, in the fifth embodiment, since the projector 1 takes in the video signal and distance information from the document camera 60 and projects the video, the projector 1 does not include the imaging unit and the distance measurement unit. In both cases, a projection image similar to that of the first embodiment can be obtained.

Embodiment 6. FIG.
FIG. 9 is a block diagram showing a configuration of a projector according to Embodiment 6 of the present invention. The projector 1 is different from the fifth embodiment in FIG. 7 in that distance information from the distance measuring unit 67 is transmitted together with a video signal from the imaging unit 62. That is, the output of the imaging unit 62 and the output of the distance measuring unit 67 are connected to an output interface unit (hereinafter referred to as an output I / F) 68. The output of the output I / F unit 68 is connected to an input interface unit (hereinafter referred to as an input I / F unit) 69 provided in the projector 1. For the output I / F unit 68 and the input I / F unit 69, for example, USB, HDMI, wired / wireless LAN, or the like is used.

  In the projector 1 of FIG. 9, the video signal from the imaging unit 62 of the document camera 60 and the distance information from the distance measuring unit 67 are transmitted to the projector 1 side via the output I / F unit 68. On the projector 1 side, when the input I / F unit 69 receives the video signal and distance information from the document camera 60, the video signal processing means 3 takes in the video signal, and the control unit 5 takes in the distance information. The subsequent signal processing of the video signal processing means 3 and the control unit 5 is the same as that of the first embodiment of FIG.

  As described above, in the sixth embodiment, since the video signal and the distance signal from the document camera 60 are transmitted to the projector 1 together, the communication path between the document camera 60 and the projector 1 can be simplified. Figured.

  In the above embodiments 4 to 6, the example of the document camera has been described as the external imaging unit. The imaging unit of the present invention is not limited to the example of the document camera, and a normal digital camera may be used. Good.

It is a block diagram which shows the structure of the projector which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the video signal processing means of FIG. It is the figure which showed the data table stored in ROM25 of a video signal processing means. It is the perspective view of the mobile phone used as a to-be-photographed object, and explanatory drawing which showed the state when imaging a mobile phone and projecting the image | video. It is explanatory drawing which showed the transition of the image | video until the image | video imaged by the imaging means is output from a scaler. It is explanatory drawing which showed the relationship between the distance of a projector and a mobile telephone, and a projection image | video. It is a block diagram which shows the structure of the projector which concerns on Embodiment 4 of this invention. It is a block diagram which shows the structure of the projector which concerns on Embodiment 5 of this invention. It is a block diagram which shows the structure of the projector which concerns on Embodiment 6 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Projector, 2 Imaging means, 3 Video signal processing means, 4 Projection part, 5 Control part, 6 Memory | storage device, 7 Distance measuring means, 8 Operation panel, 9 Operation signal processing part, 21 Frame memory, 22 Image | video cutting circuit, 23 frame memory, 24 arithmetic unit, 27 OSD circuit, 28 scaler, 31 mobile phone, 31a display screen, 60 document camera, 62 imaging means, 67 distance measuring means, 68 output I / F unit, 69 output I / F unit.

Claims (6)

Imaging means for imaging a subject;
A video corresponding to the projection display area of the subject is cut out from the video taken by the imaging means, and the video signal is processed so that the cut out video has a predetermined size to generate a video signal for projection. Video signal processing means for
A projector comprising: projection means for generating an image based on the image signal generated by the image signal processing means and projecting the image. It further comprises a distance measuring means for measuring the distance to the subject,
The video signal processing unit generates a video signal indicating the size of the video of the subject or the size of the pixel of the video signal based on the distance information measured by the distance measuring unit, and the video signal is cut out. The projector according to claim 1, wherein the projection video signal is synthesized with the synthesized video signal and the projection video signal is generated based on the synthesized video signal. Input a video signal of the subject, cut out the video corresponding to the projection display area of the subject from the video based on the video signal, process the video signal so that the cut out video has a predetermined size, and use it for projection Video signal processing means for generating a video signal of
A projector comprising: projection means for generating an image based on the image signal generated by the image signal processing means and projecting the image.   The video signal processing means inputs distance information indicating the distance to the subject, generates a video signal indicating the size of the video of the subject or the size of the pixel of the video signal based on the distance information, and the video 4. The projector according to claim 3, wherein a signal is synthesized with the clipped video signal, and the projection video signal is generated based on the synthesized video signal. Imaging a subject with an imaging means;
A step of cutting out a video corresponding to a projection display area or an arbitrary area of the subject from the video captured by the imaging unit;
Processing the video signal so that the clipped video has a predetermined size to generate a video signal for projection;
A projection display method comprising: generating a video based on the projection video signal and projecting the video on a screen. Inputting a video signal of a subject;
Cutting out a video corresponding to a projection display area or an arbitrary area of the subject from the video signal;
Processing the video signal so that the clipped video has a predetermined size to generate a video signal for projection;
A projection display method comprising: generating a video based on the projection video signal and projecting the video on a screen.

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