JP2004356989A - Geometrical correction system for input signal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a geometrical correction system for input signals which performs geometrical correction of an input signal. <P>SOLUTION: This system is composed of a curved screen 1 which requires geometrical correction, a projector 2 which determines the aspect and resolution, etc. of the input signal and projects a video image onto the curved screen 1, a computer 4 which performs processing of the geometrical correction of the input signal, a video image output unit 5 for outputting the video image input signal, and a communication cable 6 for performing two-way communication between the projector 2 and the computer 4. When a projected image on a projection surface 3 is distorted, the computer 4 receives a specified input from a user, receives an input signal from the projector 2, performs its geometrical correction, and sends its processing result to the projector 2. The projector 2 projects a video image corresponding to the corrected signal onto the curved screen 1. The two-way communication between the projector 2 and the computer 4 is performed until the distortion is corrected correctly. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an input signal geometric correction system, and more particularly to an input signal geometric correction system that does not depend on the aspect or resolution of an input signal.
[0002]
[Prior art]
When a projector projects an image on a screen on a curved surface, the projected image may be distorted due to the shape of the screen. Connect a computer with an application that performs geometric correction processing to correct the distortion to the projector, analyze the input signal that is the basis of the image projected by the projector, and convert appropriate correction data to the input signal. In addition, the input signal is deformed, and the projector projects an image corresponding to the deformed input signal onto a screen on a curved surface, thereby providing a distortion-free image.
[0003]
FIG. 10 shows a configuration diagram of a conventional typical geometric correction system that provides an image without such distortion. The input signal geometric correction system shown in FIG. 10 includes a curved screen 1, a projector 2 for projecting an image, a computer 4 for arithmetic processing, and an image output device (a video or DVD player) for outputting an input signal to the projector 2. Video output device 5).
[0004]
The projector 2 and the computer 4 are connected by a communication cable 6 for transmitting correction data of correction processing performed by the computer 4 to the projector 2.
[0005]
The projector 2 receiving the input from the video output device 5 projects a video on the curved screen 1. At this time, since the screen is a curved surface, a geometric distortion occurs in the projected image.
[0006]
The computer 4 receives an operation from the user, calculates a numerical value for geometric deformation, outputs a corresponding correction result, and transmits the correction result to the projector 2.
[0007]
However, the following problems occur with this system configuration.
The first problem is that it cannot deal with changes in the aspect of the input signal.
A second problem is that it cannot deal with a change in resolution of an input signal.
A third problem is that there is only a system configuration that performs geometric correction only for a video signal of a specific ratio with respect to an input signal from the video output device 5.
The reason is that the geometric correction of the input signal is performed only by one-way communication such that the computer 4 receives correction processing by a user's operation and transmits the corresponding correction data to the projector 2. This is because the system configuration cannot transmit the signal information from the projector 2 to the application built in the computer 4 that performs the operation. When performing efficient geometric correction of an input signal, it is desirable to refer to information (aspect, resolution, etc.) included in the input signal from the projector.
[0008]
As a conventional technique relating to correction of distortion of a projected image, there is a technique described in Patent Document 1. In this technology, video data is supplied in order to be able to correct the distortion of the video projected on the projection target in real time, and to quickly respond to various stage effects in a flexible manner. A computer, a projector that projects an image based on image data supplied from the computer onto a screen, and an image projected from the projector onto the screen becomes a front projected image projected vertically from the screen. And a computer that corrects the video data as described above, but the computer does not perform correction in consideration of the analysis of signal information from the projector. One-way communication by simply sending correction data from a computer to the projector Since there is only those that do, not able to cope with the problems described above.
[0009]
[Patent Document 1]
JP 2000-314923 A
[Problems to be solved by the invention]
In view of the above circumstances, in the present invention, by performing bidirectional communication between the projector and the computer to which an indeterminate input signal has been input, the computer obtains information such as the input signal from the projector, and converts the information into the signal. It is an object of the present invention to provide an input signal geometric correction system that performs a matched correction.
[0011]
In addition, at present, calculations are dependent on an external computer due to the problem of processing speed, but if the processing speed is resolved, a geometric correction function is installed inside the projector, and only the projector is used without relying on an external computer. Therefore, it is an object of the present invention to provide a geometric correction system for an input signal that handles geometric correction of any signal.
[0012]
It is another object of the present invention to provide a geometric correction system for input signals that makes it possible to automate input correction by utilizing the function of bidirectional communication between a projector and a computer.
[0013]
[Means for Solving the Problems]
In order to solve this object, the invention according to claim 1 has an input signal relating to an image, and the image projected by the image projection means for projecting an image based on the input signal has a curved surface to be projected. A geometric correction of the image of the input signal when an image projected on the means and projected on the projected means has a geometric distortion. And input signal output means for outputting an input signal relating to an image to the image projection means, analyzing distortion of the image, generating correction information based on a corresponding analysis result, and transmitting the correction information to the image projection means. Input signal geometry correction means for transmitting, the image projection means receives the correction information from the input signal geometry correction means, deforms the input signal based on the correction information, the deformed Projecting an image on the projection target means based on a force signal, wherein the image projection means and the input signal geometry correction means take a two-way communication form, so that the input from the image projection means is performed. The signal information of the input signal is transmitted to the signal geometry correction means, the correction information is transmitted from the input signal geometry correction means to the image projection means, and the input signal geometry correction means generates the correction information. Therefore, when analyzing the distortion of the image, the signal information is received from the image projecting means, and information which causes the distortion of the image among the signal information is referred to.
[0014]
According to a second aspect of the present invention, in the first aspect of the present invention, the input signal geometric correction unit is mounted inside the image projection unit.
[0015]
The invention according to claim 3 is the invention according to claim 1 or 2, further comprising input means for receiving an input of distortion correction by a user, wherein the input signal geometric correction means receives from the input means. The correction information is generated based on input information on distortion correction to be performed.
[0016]
The invention described in claim 4 is the invention according to any one of claims 1 to 3, further comprising an image input unit that captures an image projected onto the projection target unit by the image projection unit, The input signal geometry correction unit generates the correction information based on image information of an image received from the image input unit.
[0017]
The invention according to claim 5 is the invention according to any one of claims 1 to 3, further comprising voice input means for receiving a voice input by a user, wherein the input signal geometric correction means comprises: The correction information is generated based on voice information of a voice received from the voice input unit.
[0018]
According to a sixth aspect of the present invention, in the first aspect of the present invention, the information of the signal information that causes distortion of the image is information relating to an aspect of the image. .
[0019]
According to a seventh aspect of the present invention, in the first aspect of the present invention, the information of the signal information that causes distortion of the image is information relating to the resolution of the image. .
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described. Note that the present embodiment is an example of a preferred embodiment of the present invention, and the embodiment of the present invention is not limited to this, and may be variously modified and implemented without departing from the gist of the present invention. It is possible.
[0021]
<Configuration of First Embodiment>
As shown in FIG. 1, the input signal geometric correction system according to the first embodiment requires some geometric correction, not a flat surface such as a curved screen 1 (or a spherical surface, a corner of a wall, a curtain, etc.). A screen (see FIG. 9)), a projector 2 for projecting an image, a computer 4 for arithmetic processing, and an image output device (an image output device such as a video or DVD player) 5.
[0022]
The projector 2 and the computer 4 are connected by a communication cable 6 capable of two-way communication, and can exchange information of both.
[0023]
The projector 2 or the computer 4 receives the input value from the slide bar 7 and receives the input value from the slide bar 7 using a simple input means such as the slide bar 7 shown in FIG. , An scaler (image processing device) 9 that can perform image scaling processing, and an output device 10 that outputs the result of deformation by the scaler 9. In the first embodiment, the computer 4 includes these devices. These devices generally operate as follows.
[0024]
The projector 2 receiving the input from the video output device 5 projects a video on the curved screen 1. At this time, since the screen is a curved surface, a geometric distortion occurs in the projected image.
[0025]
The computer 4 receives an operation from the user and calculates a numerical value for geometric deformation using input from the slide bar 7 and input signal information (aspect, resolution, etc.) obtained from the projector 2 through the communication cable 6. The image is transformed by the scaler 9 through the approximation formula computing device 8 and the transformed result is outputted by the output device 10.
It should be noted that the technology of geometric deformation may be a known one.
[0026]
<Operation of First Embodiment>
Next, the overall operation of the first embodiment will be described in detail with reference to the flowchart of FIG.
[0027]
First, the projector 2 receives video input signal information from the video output device 5 (step A1).
[0028]
Next, the projector 2 determines the type, aspect, and the like of the input signal information (step A2).
[0029]
Further, the video (image) is transformed based on the correction data currently stored in the projector 2 itself (step A3).
[0030]
The projector 2 projects the image (image) deformed in Step A3 on the curved screen 1 (Step A4).
[0031]
At this time, if the projected image is distorted, the input of the user is accepted. The user inputs a numerical value to be corrected from the slide bar 7 (step A5).
[0032]
The computer 4 having received the user's input obtains signal information from the projector 2 via the communication cable 6 (step A6).
[0033]
The computer 4 causes the scaler 9 to change the size of the video according to the signal information for output, based on the signal information received from the projector 2. Furthermore, using the numerical value input by the user, the numerical value for geometric deformation calculated by the approximate expression by the arithmetic processing of the approximate expression calculating device 8 is added to the image after the deformation (step A7). .
The image of the above deformation process is such that the resolution and aspect of the base image are first determined, and then the numerical value of the geometric correction corrected by the approximate expression is added to the image. It can be considered as.
[0034]
The computer 4 causes the output device 10 to output the transformation data obtained in step A7, and sends the transformation data to the projector 2 through the communication cable 6 (step A8).
[0035]
The projector 2 projects an image on the curved screen 1 via the processing in steps A3 and A4 described above.
[0036]
Feedback is applied until the distortion projected on the curved screen 1 is corrected normally. That is, steps A5, A6, A7, A8, A3, and A4 are repeatedly performed.
[0037]
<Configuration of Second Embodiment>
Next, a configuration of the second exemplary embodiment of the present invention will be described in detail with reference to the drawings.
[0038]
As shown in FIG. 4, the input signal geometric correction system according to the second embodiment requires some geometric correction, not a flat surface such as a curved screen 1 (or a spherical surface, a corner of a wall, a curtain, etc.). A screen (see FIG. 9)), a projector 2 that projects an image and also performs arithmetic processing, and an image output device (an image output device such as a video or a DVD player) 5.
[0039]
The projector 2 receives simple input means such as the slide bar 7 shown in FIG. 2 and an input value from the slide bar 7 and calculates a numerical value for geometric deformation by using a held approximation formula. The image processing apparatus includes an approximate expression calculation device 8, a scaler (image processing device) 9 capable of performing image scaling processing, and an output device 10 that outputs a result of deformation by the scaler 9. These devices generally operate as follows.
[0040]
The projector 2 receiving the input from the video output device 5 projects a video on the curved screen 1. At this time, since the screen is a curved surface, a geometric distortion occurs in the projected image.
[0041]
The projector 2 receives an operation from the user, uses an input from the slide bar 7 and input signal information (aspect, resolution, and the like), and calculates a numerical value for geometric transformation. The image is deformed, and the deformation result is output by the output device 10.
[0042]
Therefore, the second embodiment shown in FIG. 4 employs a configuration in which the computer 4 is eliminated from FIG. 1 in the first embodiment, and the apparatus configuration for performing the geometric correction shown in FIG. Therefore, the operation processing shown in FIG. 3 does not require the assistance of the external computer 4.
[0043]
<Operation of Second Embodiment>
Next, the operation of the second embodiment will be described with reference to the flowchart of FIG.
[0044]
First, the projector 2 receives video input signal information from the video output device 5 (step B1).
[0045]
Next, the projector 2 determines the type, aspect, and the like of the input signal information (step B2).
[0046]
Further, the video (image) is deformed based on the correction data currently stored in the projector 2 itself (step B3).
[0047]
The projector 2 projects the video (image) deformed in Step B3 on the curved screen 1 (Step B4).
[0048]
At this time, if the projected image is distorted, the input of the user is accepted. The user inputs a numerical value to be corrected from the slide bar 7 of the projector 2 (step B5).
[0049]
The projector 2 receiving the user's input obtains signal information (step B6).
[0050]
Based on the signal information in step B6, the projector 2 causes the scaler 9 to change the size of the video according to the signal information for output. Further, using the numerical value input by the user, the numerical value for geometric deformation calculated by the approximate expression by the arithmetic processing of the approximate expression calculating device 8 is added to the deformed image (step B7). .
The image of the above deformation process is such that the resolution and aspect of the base image are first determined, and then the numerical value of the geometric correction corrected by the approximate expression is added to the image. It can be considered as.
[0051]
The projector 2 causes the output device 10 to output the data for deformation obtained in step B7 (step B8).
[0052]
The projector 2 projects an image on the curved screen 1 via the processing of Steps B3 and B4 described above.
[0053]
Feedback is applied until the distortion projected on the curved screen 1 is corrected normally. That is, steps B5, B6, B7, B8, B3, and B4 are repeatedly performed.
[0054]
<Configuration of Third Embodiment>
Next, a third embodiment of the present invention will be described in detail with reference to the drawings.
[0055]
As shown in FIG. 6, the input signal geometric correction system according to the third embodiment requires some geometric correction, not a flat surface such as a curved screen 1 (or a spherical surface, a corner of a wall, a curtain, etc.). Screen (see FIG. 9)), a projector 2 for projecting an image, a computer 4 for arithmetic processing, an image output device (an image output device such as a video or DVD player) 5, and an image input provided in the projector 2. The apparatus is constituted by a camera 11 that performs automatic input.
[0056]
The projector 2 and the computer 4 are connected by a communication cable 6 capable of two-way communication, and can exchange information of both.
[0057]
The projector 2 or the computer 4 receives input values from a simple input unit such as a slide bar 7 shown in FIG. 2 and a camera 11 for performing automatic image input processing shown in FIG. Approximate expression calculation device 8 for calculating numerical values for geometric deformation using the same, scaler (image processing device) 9 capable of performing image scaling processing, and output device for outputting the result of deformation by scaler 9 10 is included. In the third embodiment, the computer 4 includes these devices. These devices generally operate as follows.
[0058]
The projector 2 receiving the input from the video output device 5 projects a video on the curved screen 1. At this time, since the screen is a curved surface, a geometric distortion occurs in the projected image.
[0059]
The computer 4 transforms the image into an image by the scaler 9 through the approximate expression computing device 8 that computes a numerical value for geometric transformation by using the input by the automatic input processing of the image by the camera 11 and the input signal information (aspect, resolution, etc.) And output the transformation result on the output device 10.
[0060]
Therefore, the third embodiment shown in FIG. 6 employs a configuration in which a video input device such as the camera 11 is added to FIG. 1 of the first embodiment. Without performing this, it is possible to perform geometric correction by automatic input processing of the video input device itself. However, even if the geometric correction is performed by the automatic input processing of the video input device itself, if the user is not satisfied with the correction, the input correction using the slide bar 7 may be performed.
[0061]
Note that the camera 11 is not only provided in the projector 2 as described in the third embodiment, but may be a system configuration mounted inside the projector 2, or may be interlocked with the computer 4 and provided in the computer 4. Or a configuration mounted in the computer 4.
[0062]
Also, when a video input device such as a camera is used, data input by a user using a voice input device such as a microphone is treated as data for geometric correction. A configuration that enables the geometric correction described in the invention may be adopted.
[0063]
<Operation of Third Embodiment>
Next, the operation of the third embodiment will be described with reference to the flowchart of FIG. 8 along the configuration of the geometric correction system of FIG.
[0064]
First, the projector 2 receives video input signal information from the video output device 5 (Step C1).
[0065]
Next, the projector 2 determines the type, aspect, and the like of the input signal information (step C2).
[0066]
Further, the video (image) is transformed based on the correction data currently stored in the projector 2 itself (step C3).
[0067]
The projector 2 projects the video (image) deformed in Step C3 on the curved screen 1 (Step C4).
[0068]
At this time, if the projected image is distorted, the user does nothing and the automatic input processing from the camera 11 is performed. The projector 2 projects an image on the curved screen 1 and, from the moment the correction execution command is received, uses the camera 11 and inputs a numerical value to be corrected (step C5).
[0069]
The computer 4 receiving the input from the camera 11 obtains signal information from the projector 2 via the communication cable 6 (Step C6).
[0070]
The computer 4 causes the scaler 9 to change the size of the video according to the signal information for output, based on the signal information received from the projector 2. Further, using the numerical value input by the user, the numerical value for geometric deformation calculated by the approximate expression by the arithmetic processing of the approximate expression calculating device 8 is added to the deformed image (step C7). .
The image of the above deformation process is such that the resolution and aspect of the base image are first determined, and then the numerical value of the geometric correction corrected by the approximate expression is added to the image. It can be considered as.
[0071]
The computer 4 causes the output device 10 to output the transformation data obtained in step C7, and sends the transformation data to the projector 2 through the communication cable 6 (step C8).
[0072]
The projector 2 projects an image on the curved screen 1 via the processing of Steps C3 and C4 described above.
[0073]
Feedback is applied until the distortion projected on the curved screen 1 is corrected normally. That is, steps C5, C6, C7, C8, C3, and C4 are repeatedly performed.
[0074]
Therefore, the operation processing of the third embodiment is different from that of the first embodiment in that the input processing from the user is an automatic input processing from the camera 11, and in this case, the user does nothing. The projector projects an image on a curved screen, uses a camera, performs feedback processing between the camera, the projector, and the computer from the moment the correction execution command is received, and automatically executes the geometric correction. This correction is repeated until the distortion of the image projected on the curved screen captured by the camera approximates a straight line.
[0075]
In the third embodiment, the case of outputting the geometric correction data by the computer 4 has been described. However, a system in which the computer 4 does not exist as in the second embodiment, that is, a system in which the geometric correction function is mounted in the projector 2 It should be noted that it can be operated with.
[0076]
【The invention's effect】
From the above description, the present invention performs bidirectional communication between the projector and the computer, so that the computer obtains information such as an input signal from the projector and performs correction in accordance with the signal. Aspect).
[Brief description of the drawings]
FIG. 1 is a geometric correction system for an input signal according to a first embodiment.
FIG. 2 is a configuration diagram of each device for performing geometric correction included in the projector 2 or the computer 4.
FIG. 3 is an operation flowchart of the first embodiment.
FIG. 4 is a geometric correction system for an input signal according to a second embodiment.
FIG. 5 is an operation flowchart of the second embodiment.
FIG. 6 is a geometric correction system for an input signal according to a third embodiment.
FIG. 7 is a configuration diagram of each device that performs geometric correction of the projector 2 or the computer 4.
FIG. 8 is an operation flowchart of the third embodiment.
FIG. 9 is a sample list of the curved screen 1;
FIG. 10 is a conventional input signal geometric correction system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Curved screen 2 Projector 3 Projection surface 4 Computer 5 Video output device 6 Communication cable 7 Slide bar 8 Approximate formula operation device 9 Scaler 10 Output device 11 Camera

Claims (7)

There is an input signal related to an image, and an image projected by image projection means for projecting an image based on the input signal is projected onto a curved projection target means, and the image projected onto the projection projection means is geometrically projected. A geometric correction system for an input signal, comprising: performing geometric correction of an image of the input signal when the input signal has geometric distortion.
Input signal output means for outputting an input signal relating to an image to the image projection means,
Analyzing the distortion of the image, based on the corresponding analysis result, generating correction information, having an input signal geometry correction means for transmitting the correction information to the image projection means,
The image projection unit receives the correction information from the input signal geometry correction unit, deforms the input signal based on the correction information, and projects an image on the projection target unit based on the deformed input signal. Characterized in that
The image projecting unit and the input signal geometry correcting unit take a two-way communication form, so that the image projecting unit transmits signal information of an input signal to the input signal geometry correcting unit, and the input signal geometry The correction unit transmits correction information to the image projection unit, and the input signal geometry correction unit receives the signal information from the image projection unit when analyzing distortion of an image to generate correction information. A geometric correction system for an input signal, wherein information that causes image distortion among the signal information is referred to. The input signal geometric correction system according to claim 1, wherein the input signal geometric correction means is mounted inside the image projection means. Further comprising input means for receiving an input of distortion correction by the user,
The input signal geometry correction system according to claim 1, wherein the input signal geometry correction unit generates the correction information based on input information regarding distortion correction received from the input unit. An image input unit that captures an image projected on the projection target unit by the image projection unit,
4. The input signal geometry according to claim 1, wherein the input signal geometry correction unit generates the correction information based on image information of an image received from the image input unit. 5. Science correction system. Further comprising voice input means for receiving voice input by the user,
4. The input signal geometry according to claim 1, wherein the input signal geometry correction unit generates the correction information based on voice information of a voice received from the voice input unit. 5. Science correction system. The geometric correction system for an input signal according to any one of claims 1 to 5, wherein the information included in the signal information, which generates an image distortion, is information relating to an aspect of the image. The geometric correction system for an input signal according to any one of claims 1 to 5, wherein the information included in the signal information, which generates an image distortion, is information relating to an image resolution.

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