JP2014057237A - Computer input system, coordinate conversion device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate calibration work for a user even if setting of a projection apparatus is changed after calibration.SOLUTION: A computer 61 includes: a measuring function 61e for inputting a detection position of a measuring point, which is inputted from a position detector 4 during photographing of a measurement video; an initial projection parameter input function 61f for inputting an initial projection parameter from a projection device 3; a projection parameter re-inputting function for inputting a second projection parameter from the projection device 3 when the projection parameter of the projection device 3 is changed; a calibration function for calculating coordinate conversion parameters A and B for coordinate conversion from a position of the measuring point of a video coordinate system, a detection position of the measuring point of a detection coordinate system, the initial projection parameter and the second projection parameter; and a coordinate conversion function 61c for converting a coordinate system of the detection position inputted from the position detector 4 by using the parameters A and B from the detection coordinate system to the video coordinate system.

Description

  The present invention relates to a computer input system, a coordinate conversion device, and a program.

  It is widely practiced that a material created by a computer is projected on a screen by a projection device, and a presenter gives an explanation while pointing an arbitrary position on the screen with a pointer, a laser pointer, an interactive pen, or the like. In addition, a system has been developed that allows a position input / direction input by using a pointing stick, a laser pointer, an interactive pen, or the like like a pointing device. Specifically, an optical or ultrasonic position detection device is provided at the peripheral edge of the screen, the position where the interactive pen on the screen contacts is detected by the position detection device, and the detected position is detected from the position detection device to the computer. (See Patent Document 1). As a result, a graphical user interface is realized on the computer, and a cursor in the video can be moved, a predetermined button in the video can be clicked, and a line or the like can be drawn in the video. A computer having a graphical user interface function sets a coordinate system and performs coordinate calculation. Therefore, there are a coordinate system used when the position is detected by the position detection device and a coordinate system used for computer coordinate calculation, and the user needs to perform calibration work in order to accurately associate these coordinate systems ( Patent Document 1).

JP 2011-126225 A

  By the way, after the user performs the calibration work, the focal length of the zoom type projection lens of the projection apparatus may be changed, or the resolution of the image projected by the projection apparatus may be changed. If it does so, the correlation of the coordinate system of a position detection apparatus and the coordinate system of a computer will collapse. Therefore, it is necessary for the user to perform the calibration work again.

  Therefore, the problem to be solved by the present invention is to make it unnecessary for the user to perform calibration work even when the setting of the projection apparatus is changed after calibration.

  In order to solve the above problems, an input computer input system according to the present invention projects a video by a computer that outputs a video signal and a projection device that is connected to the computer and displays a video according to the video signal. A position detection device that detects a user's designated position on the screen so as to be represented by a detection coordinate system along the screen, and outputs the detected position to the computer. A measurement image generation function that generates a measurement image including a measurement point whose position is represented in a coordinate system, and outputs a signal of the measurement image to the projection device; and the measurement point input from the position detection device A measurement function for inputting and storing a detection position, and an initial projection parameter input function for inputting and storing an initial projection parameter from the projection apparatus; A projection parameter re-input function for inputting the second projection parameter from the projection device when the projection parameter of the projection device is changed from the initial projection parameter to the second projection parameter, and the image coordinate system. For coordinate conversion from the position of the measurement point, the detection position of the measurement point stored by the measurement function, the initial projection parameter stored by the initial projection parameter input function, and the second projection parameter input by the projection parameter re-input function A calibration function for calculating a parameter of the image, and a coordinate system of a detection position input from the position detection device using the parameter for coordinate conversion calculated by the calibration function from the detection coordinate system to the video coordinate system And a coordinate conversion function for converting to.

  The coordinate conversion device according to the present invention inputs the detection position from a position detection device that detects the user's designated position on the screen on which the image is projected by the projection device so as to be represented by a detection coordinate system along the screen. A computer for outputting a video signal to the projection device, wherein the computer generates a measurement video including a measurement point whose position is represented in a video coordinate system along the video, and outputs the measurement video signal. Measurement video generation function to be output to the projection apparatus, measurement function to input and store the detection position of the measurement point input from the position detection apparatus, and initial stage to input and store initial projection parameters from the projection apparatus Projection parameter input function and the projection when the projection parameter of the projection device is changed from the initial projection parameter to the second projection parameter. A projection parameter re-input function for inputting the second projection parameter from a position; a position of the measurement point represented in the video coordinate system; a detection position of the measurement point stored by the measurement function; and an initial projection parameter input function A calibration function for calculating a parameter for coordinate conversion from the initial projection parameter stored by the above and the second projection parameter input by the projection parameter re-input function, and the parameter for coordinate conversion calculated by the calibration function And a coordinate conversion function for converting the coordinate system of the detection position input from the position detection device from the detection coordinate system to the video coordinate system.

  A program according to the present invention inputs a detection position from a position detection device that detects a user's designated position on a screen on which a video is projected by the projection device so as to be represented by a detection coordinate system along the screen, and A computer for outputting a signal to the projection device generates a measurement image including a measurement point whose position is represented in the image coordinate system along the image, and outputs a signal of the measurement image to the projection device. An image generation function, a measurement function for inputting and storing the detection position of the measurement point input from the position detection device, an initial projection parameter input function for inputting and storing an initial projection parameter from the projection device, and the projection When the projection parameter of the apparatus is changed from the initial projection parameter to the second projection parameter, the second projection parameter from the projection apparatus A projection parameter re-input function to be input; the position of the measurement point represented in the video coordinate system; the detection position of the measurement point stored by the measurement function; the initial projection parameter stored by the initial projection parameter input function; A calibration function for calculating a parameter for coordinate conversion from the second projection parameter input by the projection parameter re-input function, and the position detection device using the parameter for coordinate conversion calculated by the calibration function And a coordinate conversion function for converting the coordinate system of the detection position input from the detection coordinate system to the video coordinate system.

  According to the present invention, the detection position by the position detection device is converted from the detection coordinate system to the video coordinate system using the initial projection parameter and the second projection parameter input to the computer from the projection device. Even if the setting is changed, the user does not need to perform calibration work.

It is a perspective view which shows the use condition of a computer input system. It is a block diagram of a computer input system. It is drawing which showed the image | video for a measurement.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. However, the embodiments described below are given various technically preferable limitations for carrying out the present invention. Therefore, the technical scope of the present invention is not limited to the following embodiments and illustrated examples.

  FIG. 1 is a perspective view showing a use state of the computer input system 1. This computer input system 1 is applied to an interactive whiteboard system (electronic blackboard system) using a projection device 3. The computer input system 1 is a coordinate conversion system that performs coordinate conversion (coordinate calibration) of a detection position using the coordinate conversion device 6.

  The computer input system 1 includes a screen 2, a projection device 3, a position detection device (digitizer) 4, an instruction pen 5, and a coordinate conversion device 6.

  The screen 2 is a wall, curtain, board or the like. For example, a projection screen (projector screen), a white board, a white wall, a table, or the like can be used for the screen 2.

  The coordinate transformation device 6 is a notebook personal computer, desktop personal computer, tablet personal computer or other personal computer. The coordinate conversion device 6 generates a video (screen) by various arithmetic processes, and outputs a video signal according to the video to the projection device 3. The coordinate conversion device 6 performs various coordinate operations when generating an image, and sets an orthogonal coordinate system when performing coordinate operations. That is, the x coordinate along the horizontal direction of the video is set by the coordinate conversion device 6, and the y coordinate along the vertical direction of the video is set by the coordinate conversion device 6. Hereinafter, an orthogonal coordinate system representing a position on an image is referred to as an image coordinate system.

  The projection device 3 is a so-called data projector. That is, the video signal output by the coordinate conversion device 6 is transmitted to the projection device 3 by the video transmission cable 7, and the projection device 3 projects an image according to the video signal onto the screen 2.

  The projection device 3 and the coordinate conversion device 6 are connected by a communication cable (for example, a USB cable) 8, and data representing the projection status of the projection device 3 (hereinafter referred to as projection parameters) is transmitted from the projection device 3 to the communication cable 8. And transferred to the coordinate conversion device 6. Projection parameters include a slow ratio, a horizontal scale parameter, and a vertical scale parameter. The slow ratio represents a reduction rate of the projection distance, and generally refers to a value obtained by dividing the projection distance by the screen width. The vertical scale parameter is a value obtained by dividing the vertical resolution of the output video by the vertical resolution of the input video. The horizontal direction scale parameter is a value obtained by dividing the horizontal resolution of the output video by the horizontal resolution of the input video. The input video refers to the video of the video signal input from the coordinate conversion device 6 to the projection device 3, and the output video refers to the video projected by the projection device 3. Also, the resolution does not mean the density of pixels in the video, but the number of pixels in the video. In other words, the vertical resolution of the video refers to the number of pixels in the vertical direction of the video, the horizontal resolution of the video refers to the number of pixels in the horizontal direction of the video, and the resolution of the video refers to the total number of pixels of the video (video The number of vertical pixels × the number of horizontal pixels).

  The position detection device 4 is provided on the screen 2. The position detection device 4 detects the position of the pointing pen 5 on the screen 2. Any method for detecting the position of the pointing pen 5 by the position detection device 4 may be used. For example, the position detection device 4 includes a plurality of light projecting elements and light receiving elements arranged on the peripheral edge of the screen 2, and these light projecting elements emit light along the screen 2 and light emitted from the light projecting elements. (Preferably, light outside the visible light band is received) by these light receiving elements, and when the light is blocked by the pointing pen 5, the position is detected by the light receiving elements. Alternatively, the position detection device 4 has an electronic camera (for example, an infrared electronic camera) or the like directly facing the screen 2, and the screen 2 including the pointing pen 5 is imaged by the electronic camera, and an image of the pointing pen 5 in the captured image. Is detected by an image processing technique, so that the position of the pointing pen 5 is detected. Alternatively, the position detection device 4 has a plurality of electronic cameras (for example, infrared electronic cameras) provided on the peripheral edge of the screen 2, the pointing pen 5 is imaged by these electronic cameras, and triangulation is performed from these captured images. The position of the pointing pen 5 is detected. Alternatively, the position detection device 4 includes two or more ultrasonic detectors arranged at the peripheral edge of the screen 2, an ultrasonic oscillator is built in the pointing pen 5, and ultrasonic waves emitted from the pointing pen 5 are detected by these ultrasonic waves. The position of the pointing pen 5 is detected trigonometrically from the time difference until the ultrasonic waves reach the ultrasonic detectors. Alternatively, when the position detection device 4 is a pressure-sensitive sheet attached to the screen 2 and the pointing pen 5 contacts the pressure-sensitive sheet, the position is detected.

  When the user indicates a certain position (contact position) in the projected image by bringing the tip of the pointing pen 5 into contact with the screen 2, the position is detected by the position detection device 4, and the detected position is detected by the position detection device. 4 is input to the coordinate conversion device 6. Thus, the user can move the cursor in the projected video and input various positions. Transmission of the detection position from the position detection device 4 to the coordinate conversion device 6 is performed by a communication cable (for example, USB cable) 9 or wirelessly. The detection position detected by the position detection device 4 is represented by an orthogonal coordinate system. That is, the X coordinate is determined along the horizontal direction of the screen 2, the Y coordinate is determined along the vertical direction of the screen 2, and the detection position detected by the position detection device 4 is expressed by the X coordinate and the Y coordinate. . An orthogonal coordinate system representing the detection position detected by the position detection device 4 is referred to as a detection coordinate system.

  The instruction pen 5 is provided with a push button corresponding to a mouse click button. That is, when the user presses the push button of the pointing pen 5, a signal to that effect (hereinafter referred to as a click signal) is transmitted to the coordinate conversion device 6 by the pointing pen 5 wirelessly or by wire. Thereby, the user can input various commands (page switching command, window switching command, click command, selection command, determination command, drag command, drop command, video enlargement command, video reduction command, etc.).

  FIG. 2 is a block diagram of the computer input system 1. As shown in FIG. 2, the projection device 3 includes a video input terminal 30, a video signal processing unit 31, a display controller 32, a display element 33, a light irradiation device 34, a projection lens 35, a lens driving unit 36, an operation unit 37, and a control. Part 38 and the like.

  The operation unit 37 includes a plurality of switches (push buttons). The operation unit 37 outputs a signal corresponding to the operation content to the control unit 38 when operated by the user. For example, when the user operates the operation unit 37, the focal length of the projection lens 35 is changed, or the aspect ratio of the projected image (the aspect ratio of the display image of the display element 33) is changed.

  The video output terminal of the computer 61 of the coordinate transformation device 6 is connected to the video input terminal 30 via the video transmission cable 7, and the video signal output by the computer 61 is input to the video input terminal 30. Note that the video signal may be transmitted from the coordinate conversion device 6 to the projection device 3 wirelessly.

  The video signal processing unit 31 performs various types of signal processing on the video signal input from the video input terminal 30. For example, the video signal processing unit 31 performs scaling of the video signal input from the computer 61 of the coordinate conversion device 6 to increase or decrease the resolution of the video signal. The resolution of the video signal before being converted by the video signal processing unit 31 is referred to as input resolution, and the resolution of the video signal after being converted by the video signal processing unit 31 is referred to as output resolution. The input resolution is equal to the resolution of the input video input from the coordinate conversion device 6 to the projection device 3, and the output video is equal to the resolution of the output video projected by the projection device 3.

  The display controller 32 drives the display element 33 based on the video signal input from the video signal processing unit 31. The display controller 32 performs PWM control, PNM control, or the like for each pixel of the display element 33 according to the video signal input from the video signal processing unit 31, so that light emitted to the display element 33 is modulated pixel by pixel. . Thereby, an image (screen) is formed by the display element 33.

  The display element 33 is a DMD (digital micromirror device), a transmissive LCD panel (liquid crystal display panel), or a reflective LCD panel having a plurality of pixels arranged in a two-dimensional array. When the display element 33 is a DMD, the pixel of the display element 33 is a movable micromirror, and when the display element 33 is an LCD panel, the pixel of the display element 33 is a liquid crystal shutter element.

  The display controller 32 controls the light irradiation device 34. The light irradiation device 34 emits visible light toward the display element 33. Specifically, the light irradiation device 34 is of a time division method or a color separation method.

  When the light irradiation device 34 is a color separation method, the light irradiation device 34 has a white light source, a color separator, and the like, and white light emitted from the white light source is output in a plurality of colors (for example, red, green, blue). ). In this case, the display element 33 is provided for each color, light of a plurality of colors is irradiated to the display element 33, and light transmitted or reflected by the display elements 33 is synthesized.

  When the light irradiation device 34 is a time division system, the light irradiation device 34 sequentially irradiates the display element 33 with visible light of different colors (for example, red light, green light, and blue light) one after another. The period corresponds to a period of one frame. When the light irradiation device 34 is a time division method, the light irradiation device 34 is a color filter method or a color light source method. When the light irradiation device 34 is a color filter system, the light irradiation device 34 includes a color filter, a spindle motor, a white light source, and the like. The color filter is rotated by the spindle motor, and white light emitted from the white light source is rotating. By passing through the color filter, the white light is sequentially converted into each color (red, green, blue) and converted. When the light irradiation device 34 is a color light source system, the light irradiation device 34 has a plurality of light sources having different colors (for example, a red light source, a green light source, and a blue light source), and these light sources are sequentially turned on repeatedly. The light source is a semiconductor light emitting element (for example, a laser diode, a light emitting diode) or a lamp (for example, a halogen lamp, a xenon lamp, a metal halide, a mercury lamp, a discharge lamp), or a phosphor is added to the semiconductor light emitting element or the lamp. A combination.

  The projection lens 35 projects the video (screen) formed by the display element 33 onto the screen 2 as a projection screen. The projection lens 35 is provided so as to be movable along the optical axis by a helicoid mechanism or the like, and the projection lens 35 can be focused by moving the projection lens 35 along the optical axis. The projection lens 35 is a zoom lens, and the focal length of the projection lens 35 is adjusted by driving the projection lens 35 by the lens driving unit 36.

  The control unit 38 is a microcomputer having a CPU and a storage device. Various functions according to the program stored in the storage device are realized in the control unit 38, and the video signal processing unit 31, the display controller 32, and the lens driving unit 36 are integrally controlled by the control unit 38. An example of the function of the control unit 38 realized by the program will be described below.

  The control unit 38 causes the video signal processing unit 31 to perform signal processing of the video signal. At that time, the control unit 38 acquires the horizontal scale parameter and the vertical scale parameter from the video signal processing unit 31. That is, the control unit 38 divides the horizontal resolution of the video signal output from the video signal processing unit 31 by the horizontal resolution of the video signal input to the video signal processing unit 31 (horizontal scale parameter). ) Is acquired from the video signal processing unit 31. Further, the control unit 38 divides the vertical resolution of the video signal output from the video signal processing unit 31 by the vertical resolution of the video signal input to the video signal processing unit 31 (vertical scale parameter). ) Is acquired from the video signal processing unit 31. And the control part 38 memorize | stores the acquired horizontal direction scale parameter and vertical direction scale parameter. The control unit 38 may acquire the input resolution and the output resolution of the video signal processing unit 31 and calculate the horizontal scale parameter and the vertical scale parameter from the input resolution and the output resolution.

  The aspect ratio of the video signal converted by the video signal processing unit 31 is not always constant, and the video signal processing unit 31 can change the aspect ratio of the video signal. That is, the control unit 38 sets the output resolution, and the video signal processing unit 31 scales the video signal input from the coordinate conversion device 6 via the video input terminal 30 to the video signal having the set resolution. At that time, the control unit 38 acquires the horizontal scale parameter and the vertical scale parameter from the video signal processing unit 31.

  When the control unit 38 controls the lens driving unit 36, the projection lens 35 is driven by the lens driving unit 36. When the projection lens 35 is driven, the focal length of the projection lens 35 is changed.

  The control unit 38 acquires the focal length of the projection lens 35 through the lens driving unit 36. The control unit 38 stores the detected focal length. The slow ratio is a function of the focal length of the projection lens 35, and the slow ratio is uniquely determined from the focal length of the projection lens 35. That is, the control unit 38 has a function of converting the focal length of the projection lens 35 into a slow ratio, and the acquisition of the focal length of the projection lens 35 by the control unit 38 corresponds to the acquisition of the slow ratio.

  The coordinate transformation device 6 includes a computer 61, a storage medium 62, a display 63 and an input device 64.

  The computer 61 has a CPU, memory, GPU, VRAM, ASIC, bus, input / output interface, disk reader, and the like. The storage medium 62 is accessible to the computer 61. The storage medium 62 is a hard disk drive, non-volatile memory, ROM, or other storage device.

  The storage medium 62 stores a program 62a. The program 62 a is a device driver for the position detection device 4 and the pointing pen 5. The program 62a sends a detection position input function 61a, a click signal input function 61b, a coordinate conversion function 61c, a measurement image generation function 61d, a measurement function 61e, an initial projection parameter input function 61f, an initial calibration function 61g, a projection parameter re-transmission to the computer 61. The input function 61h and the recalibration function 61i are realized. Hereinafter, these functions 61a to 61i will be described.

・ Detection position input function 61a
The computer 61 inputs the detection position output by the position detection device 4. As described above, the detection position input from the position detection device 4 to the computer 61 is expressed in the detection coordinate system, and the detection position input from the position detection device 4 to the computer 61 is (X, Y). Represent.

・ Click signal input function 61b
The computer 61 inputs the click signal output by the pointing pen 5.

・ Coordinate conversion function 61c
The computer 61 converts the coordinate system of the detection position (X, Y) input by the detection position input function 61a from the detection coordinate system to the video coordinate system. Specifically, the computer 61 converts the detection position (X, Y) into coordinates (x, y) in the video coordinate system based on the following formula (1).

  A and B are parameters for coordinate conversion, A is a matrix with 2 rows and 2 columns, and B is a matrix with 2 rows and 1 column. Elements a11, a22, b1, and b2 of the matrices A and B are obtained by an initial calibration function 61g and a recalibration function 61i described later. Note that, if calibration by the initial calibration function 61g and the recalibration function 61i is not performed, the elements a11, a22, b1, and b2 are default values.

  The computer 61 uses the position (x, y) after the coordinate conversion for other software, applications, operating systems, and the like. Thus, the user can move the cursor in the projected video and input various positions.

・ Measurement video generation function 61d
The computer 61 generates a measurement video as shown in FIG. 3 and outputs a video signal of the measurement video to the projection device 3. Specifically, the computer 61 sets the measurement points P1 to P4 in the video coordinate system, generates a measurement video including the measurement points P1 to P4, and outputs the video signal of the measurement video to the projection device 3. Output to. Then, the measurement points P1 to P4 are displayed on the image projected on the screen 2 by the projection device 3.

  The coordinates (x0, y0) of the measurement point P1, the coordinates (x0, y1) of the measurement point P2, the coordinates (x1, y0) of the measurement point P3, and the coordinates (x1, y1) of the measurement point P4 are represented in the video coordinate system. It is a thing. The coordinates (x0, y0) of the measurement point P1, the coordinates (x0, y1) of the measurement point P2, the coordinates (x1, y0) of the measurement point P3, and the coordinates (x1, y1) of the measurement point P4 are previously stored in the program 62a. It has been incorporated.

  When the user inputs a calibration command by operating the input device 64, or when the position detection device 4 is connected to the computer 61, the measurement video generation function 61d is realized.

  Note that the measurement points P1 to P4 may not be displayed at the same time but the measurement points P1 to P4 may be sequentially displayed.

・ Measurement function 61e
When the measurement video is projected on the screen 2 by the measurement video generation function 61d, the user places the indication pen 5 on the measurement point P1 displayed on the screen 2 and presses the push button of the indication pen 5. Then, the computer 61 inputs a click signal from the pointing pen 5 (refer to the description of the click signal input function 61b), and when the click signal is input, the detection position (X 0, X) input from the position detection device 4 by the detection position input function 61a. Y0) is stored in association with the coordinates (x0, y0). The detection position (X0, Y0) represents the position of the measurement point P1 in the detection coordinate system.

  Similarly, when the user places the pointing pen 5 on the measurement point P2 and presses the push button of the pointing pen 5, the computer 61 detects the detection position (X0, Y1) is stored in association with the coordinates (x0, y1), and when the user places the pointing pen 5 on the measurement point P3 and presses the push button of the pointing pen 5, the computer 61 at that time detects the position detecting device 4 The detection position (X1, Y0) of the measurement point P3 input from is stored in association with the coordinates (x1, y0), and the user places the indication pen 5 on the measurement point P4 and presses the push button of the indication pen 5 The computer 61 stores the detection position (X1, Y1) of the measurement point P4 input from the position detection device 4 at that time in association with the coordinates (x1, y1).

  When the measurement image is projected on the screen 2, the user points to the measurement points P <b> 1 to P <b> 4 on the screen 2 by using a hand, a pointer, a laser pointer, or the like without using the pointing pen 5. Also good. The position indicated by the hand, the pointing bar or the laser pointer is detected by the position detection device 4. When the user points to the measurement points P1 to P4 with a hand, an indicator bar or a laser pointer, the user presses the push button of the indicator pen 5 or presses a specific key (for example, a return key) of the input device 64 The computer 61 stores the detection position input from the position detection device 4 by the detection position input function 61a at that time. The detection position is the position of the measurement point P1, the measurement point P2, the measurement point P3, or the measurement point P4 expressed in the detection coordinate system.

-Initial projection parameter input function 61f
When the measurement image is projected, the user places the indication pen 5 on the measurement point P1, the measurement point P2, the measurement point P3, or the measurement point P4 and presses the push button of the indication pen 5, whereby the computer 61 is instructed. 5 receives a click signal (refer to the description of the measurement function 61e and the click signal input function 61b). Then, the computer 61 issues a projection parameter output command to the control unit 38 of the projection device 3, and the control unit 38 that receives the command acquires the horizontal scale parameter and the vertical scale parameter from the video signal processing unit 31. Further, the control unit 38 acquires the slow ratio through the lens driving unit 36. Then, the control unit 38 transfers the horizontal scale parameter, the vertical scale parameter, and the slow ratio to the computer 61 of the coordinate conversion device 6. The computer 61 inputs and stores the horizontal scale parameter, vertical scale parameter, and slow ratio output by the control unit 38. Hereinafter, the horizontal scale parameter, the vertical scale parameter, and the slow ratio input by the initial projection parameter input function 61f are referred to as an initial horizontal scale parameter SPx0, an initial vertical scale parameter SPy0, and an initial slow ratio TR0, respectively.

・ Initial calibration function 61g
The computer 61 uses the coordinates (x0, y0) and the detection position (X0, Y0) of the measurement point P1, the detection position (X0, Y1) and the coordinates of the measurement point P2 as shown in the following equations (2) to (5). x0, y1), the detection position (X1, Y0) and coordinates (x1, y0) of the measurement point P3, and the detection position (X1, Y1) and coordinates (x1, y1) of the measurement point P4, the elements a11 of the matrices A and B , A22, b1, b2.

  Then, the computer 61 reflects the elements a11, a22, b1, and b2 of the obtained matrices A and B on the coordinate conversion function 61c. Thereby, the calibration of the coordinate system is performed, and the detection coordinate system and the video coordinate system can be accurately associated with each other.

・ Projection parameter re-input function 61h
After the calibration is performed by the initial calibration function 61g, the computer 61 stands by while monitoring the control unit 38 of the projection apparatus 3. At this time, the focal length (slow ratio) of the projection lens 35 is changed by the user operating the operation unit 37 and the control unit 38 controlling the lens driving unit 36 according to the operation content. Thereby, the size of the image projected on the screen 2 is changed. In addition, the user operates the operation unit 37, and the control unit 38 changes the output resolution of the video signal processing unit 31 according to the operation content. Thereby, the resolution of the image projected on the screen 2 is changed. Note that the aspect ratio may be changed or the aspect ratio may not be changed by changing the resolution of the image projected on the screen 2.

  When the focal length of the projection lens 35 and / or the output resolution of the video signal processing unit 31 are changed, the control unit 38 acquires the horizontal scale parameter and the vertical scale parameter from the video signal processing unit 31. Further, the control unit 38 acquires the slow ratio through the lens driving unit 36. Then, the control unit 38 transfers the horizontal scale parameter, the vertical scale parameter, and the slow ratio to the computer 61 of the coordinate conversion device 6. The computer 61 inputs and stores the horizontal scale parameter, vertical scale parameter, and slow ratio output by the control unit 38. Hereinafter, the horizontal scale parameter, the vertical scale parameter, and the slow ratio input by the projection parameter re-input function 61h are referred to as a second horizontal scale parameter SPxn, a second vertical scale parameter SPyn, and a second slow ratio TRn, respectively.

  For example, in the following situations (1) to (2), when the output resolution of the video signal processing unit 31 is changed by the user operating the operation unit 37 as described above, the image is projected on the screen 2. The aspect ratio of the recorded video can be made appropriate. In the following situations (3) to (4), when the output resolution of the video signal processing unit 31 is changed by the user operating the operation unit 37 as described above, the image is projected onto the screen 2. The video resolution can be made appropriate. In the following situations (5) to (6), when the focal length (slow ratio) of the projection lens 35 is changed by the user operating the operation unit 37 as described above, the projection is performed on the screen 2. The size of the image to be played can be made appropriate.

(1) When video data (for example, a file) displayed by the coordinate conversion device 6 is changed and the aspect ratio of the video data after the change is different from the aspect ratio of the video data before the change

(2) When the image projected on the screen 2 is easier to see when the aspect ratio is changed by changing the output resolution of the video signal processing unit 31

(3) When the resolution of the video signal of the coordinate conversion device 6 is changed (when the input resolution of the video signal processing unit 31 is changed)

(4) When the coordinate calculation device 6 performs a digital zoom process and generates a video signal that enlarges a part of the display area.

(5) When the output resolution of the video signal processing unit 31 is changed, and the focal length (slow ratio) of the projection lens 35 needs to be changed along with the scaling setting change of the video projected on the screen 2

(6) When the focal length of the projection lens 35 is not appropriate when the projection device 3 is installed, and the size of the image projected on the screen 2 and the size of the screen 2 are extremely different

・ Recalibration function 61i
The computer 61 obtains the elements a11, a22, b1, and b2 of the matrices A and B when the projection parameters are input by the projection parameter re-input function 61h. Specifically, the computer 61 uses the coordinates (x0, y0) and the detection position (X0, Y0) of the measurement point P1, and the coordinates (x0, y1) of the measurement point P2 as in the following equations (6) to (9). ) And detection position (X0, Y1), coordinates (x1, y0) and detection position (X1, Y0) of measurement point P3, coordinates (x1, y1) and detection position (X1, Y1) of measurement point P4, initial horizontal The elements a11, a22, b1 of the matrices A, B from the direction scale parameter SPx0, the initial vertical scale parameter SPy0, the initial slow ratio TR0, the second horizontal scale parameter SPxn, the second vertical scale parameter SPyn, and the second slow ratio TRn , B2.

  Then, the computer 61 reflects the elements a11, a22, b1, and b2 of the obtained matrices A and B on the coordinate conversion function 61c. Thereby, even after the size and resolution of the projected image are changed, the coordinate system is calibrated, and the detected coordinate system and the image coordinate system can be accurately associated with each other. For example, the user finishes the initial calibration operation (see the description of the measurement function 61e) while the projection device 3 is not projected at the optimal projection magnification, and then the optical zoom ( Even if the focal length of the projection lens 35 is changed) or digital zoom (change of output resolution) is performed to achieve the optimum projection magnification, the user does not have to perform calibration again. Therefore, the convenience of the computer input system 1 is improved.

[Modification]
Hereinafter, some modified examples will be described. The modifications described below are the same as those in the above-described embodiment except for the changes.

(1) In the above-described embodiment, the initial projection parameters that the computer 61 inputs and stores using the initial projection parameter input function 61f are the initial horizontal scale parameter SPx0, the initial vertical scale parameter SPy0, and the initial slow ratio TR0. The second projection parameters input and stored by the computer 61 using the projection parameter re-input function 61h were the second horizontal scale parameter SPxn, the second vertical scale parameter SPyn, and the second slow ratio TRn. In contrast, the initial projection parameter that the computer 61 inputs and stores using the initial projection parameter input function 61f is the initial slow ratio TR0, and the second projection parameter that the computer 61 inputs and stores using the projection parameter re-input function 61h. The second slow ratio TRn may be used.

  In this case, when the focal length (slow ratio) of the projection lens 35 is changed, the control unit 38 of the projection device 3 outputs the second slow ratio TRn to the computer 61. Further, the computer 61 uses the recalibration function 61i to set the coordinates (x0, y0), the detection position (X0, Y0), and the measurement point P2 of the measurement point P1, as in the following equations (10) to (13). Coordinates (x0, y1) and detection position (X0, Y1), coordinates (x1, y0) and detection position (X1, Y0) of measurement point P3, coordinates (x1, y1) and detection position (X1, Y0) of measurement point P4 Y1), the elements a11, a22, b1, and b2 of the matrices A and B are obtained from the initial slow ratio TR0 and the second slow ratio TRn.

(2) The initial projection parameters input and stored by the computer 61 using the initial projection parameter input function 61f are the initial horizontal scale parameter SPx0 and the initial vertical scale parameter SPy0. The computer 61 inputs the projection parameter reinput function 61h. The second projection parameters stored in this manner may be the second horizontal scale parameter SPxn and the second vertical scale parameter SPyn.

  In this case, when the output resolution of the video signal processing unit 31 is changed, the control unit 38 of the projection device 3 outputs the second horizontal scale parameter SPxn and the second vertical scale parameter SPyn to the computer 61. In addition, the computer 61 uses the recalibration function 61i so that the coordinates (x0, y0), the detection position (X0, Y0), and the measurement point P2 of the measurement point P1 are represented by the following equations (14) to (17). Coordinates (x0, y1) and detection position (X0, Y1), coordinates (x1, y0) and detection position (X1, Y0) of measurement point P3, coordinates (x1, y1) and detection position (X1, Y0) of measurement point P4 Y1), the elements a11, a22, b1, and b2 of the matrices A and B are obtained from the second horizontal scale parameter SPxn and the second vertical scale parameter SPyn.

但し、（Ｘ，Ｙ）は前記位置検出装置によって検出された検出位置を前記検出座標系で表したものであり、（ｘ，ｙ）は前記位置検出装置によって検出された検出位置を前記映像座標系で表したものである。
＜請求項４＞
前記投影装置の投影パラメータが、前記投影装置によって投影される映像の横方向の解像度を前記投影装置に入力される映像の横方向の解像度で除して得られる横方向スケールパラメータ及び前記投影装置によって投影される映像の縦方向の解像度を前記投影装置に入力される映像の縦方向の解像度で除して得られる縦方向スケールパラメータである、
ことを特徴とする請求項１に記載のコンピュータ入力システム。
＜請求項５＞
前記測定点の数が４であり、前記映像座標系におけるこれら測定点の位置をそれぞれ（ｘ0，ｙ0）、（ｘ0，ｙ1）、（ｘ1，ｙ0）及び（ｘ1，ｙ1）とし、前記測定機能によって記憶したこれら測定点の検出位置をそれぞれ（Ｘ0，Ｙ0）、（Ｘ0，Ｙ1）、（Ｘ1，Ｙ0）及び（Ｘ1，Ｙ1）とし、前記初期投影パラメータ入力機能により記憶した前記初期投影パラメータとしての横方向スケールパラメータをSPx0とし、前記初期投影パラメータ入力機能により記憶した前記初期投影パラメータとしての縦方向スケールパラメータをSPy0とし、前記投影パラメータ再入力機能により入力した前記第二投影パラメータとしての横方向スケールパラメータをSPxnとし、前記投影パラメータ再入力機能により入力した前記第二投影パラメータとしての縦方向スケールパラメータをSPynとし、前記キャリブレーション機能により算出される前記座標変換用のパラメータをＡ，Ｂとすると、前記座標変換機能は前記位置検出装置から入力した検出位置の座標系を以下の式（１）に従って前記検出座標系から前記映像座標系に変換する、
ことを特徴とする請求項４に記載のコンピュータ入力システム。

但し、（Ｘ，Ｙ）は前記位置検出装置によって検出された検出位置を前記検出座標系で表したものであり、（ｘ，ｙ）は前記位置検出装置によって検出された検出位置を前記映像座標系で表したものである。
＜請求項６＞
前記投影装置の投影パラメータが、前記投影装置によって投影される映像の横方向の解像度を前記投影装置に入力される映像の横方向の解像度で除して得られる横方向スケールパラメータ、前記投影装置によって投影される映像の縦方向の解像度を前記投影装置に入力される映像の縦方向の解像度で除して得られる縦方向スケールパラメータ及びスローレシオである、
ことを特徴とする請求項１に記載のコンピュータ入力システム。
＜請求項７＞
前記測定点の数が４であり、前記映像座標系におけるこれら測定点の位置をそれぞれ（ｘ0，ｙ0）、（ｘ0，ｙ1）、（ｘ1，ｙ0）及び（ｘ1，ｙ1）とし、前記測定機能によって記憶したこれら測定点の検出位置をそれぞれ（Ｘ0，Ｙ0）、（Ｘ0，Ｙ1）、（Ｘ1，Ｙ0）及び（Ｘ1，Ｙ1）とし、前記初期投影パラメータ入力機能により記憶した前記初期投影パラメータとしての横方向スケールパラメータをSPx0とし、前記初期投影パラメータ入力機能により記憶した前記初期投影パラメータとしての縦方向スケールパラメータをSPy0とし、前記初期投影パラメータ入力機能により記憶した前記初期投影パラメータとしてのスローレシオをTR0とし、前記投影パラメータ再入力機能により入力した前記第二投影パラメータとしての横方向スケールパラメータをSPxnとし、前記投影パラメータ再入力機能により入力した前記第二投影パラメータとしての縦方向スケールパラメータをSPynとし、前記投影パラメータ再入力機能により入力した前記第二投影パラメータとしてのスローレシオをTRnとし、前記キャリブレーション機能により算出されるパラメータをＡ，Ｂとすると、前記座標変換機能は前記位置検出装置から入力した検出位置の座標系を以下の式（１）に従って前記検出座標系から前記映像座標系に変換する、
ことを特徴とする請求項６に記載のコンピュータ入力システム。

但し、（Ｘ，Ｙ）は前記位置検出装置によって検出された検出位置を前記検出座標系で表したものであり、（ｘ，ｙ）は前記位置検出装置によって検出された検出位置を前記映像座標系で表したものである。
＜請求項８＞
投影装置によって映像が投影されるスクリーン上のユーザーの指示位置を前記スクリーンに沿った検出座標系で表すように検出する位置検出装置からその検出位置を入力するとともに、映像信号を前記投影装置に出力するコンピュータを備え、
前記コンピュータが、
前記映像に沿った映像座標系で位置が表された測定点を含む測定用映像を生成し、その測定用映像の信号を前記投影装置に出力する測定用映像生成機能と、
前記位置検出装置から入力した前記測定点の検出位置を入力して記憶する測定機能と、
前記投影装置から初期投影パラメータを入力して記憶する初期投影パラメータ入力機能と、
前記投影装置の投影パラメータが前記初期投影パラメータから第二投影パラメータに変更された場合に前記投影装置から前記第二投影パラメータを入力する投影パラメータ再入力機能と、
前記映像座標系で表された前記測定点の位置、前記測定機能により記憶した前記測定点の検出位置、前記初期投影パラメータ入力機能により記憶した前記初期投影パラメータ及び前記投影パラメータ再入力機能により入力した前記第二投影パラメータから座標変換用のパラメータを演算するキャリブレーション機能と、
前記キャリブレーション機能により演算された前記座標変換用のパラメータを利用して前記位置検出装置から入力した検出位置の座標系を前記検出座標系から前記映像座標系に変換する座標変換機能と、を有する、
ことを特徴とする座標変換装置。
＜請求項９＞
投影装置によって映像が投影されるスクリーン上のユーザーの指示位置を前記スクリーンに沿った検出座標系で表すように検出する位置検出装置からその検出位置を入力するとともに、映像信号を投影装置に出力するコンピュータに、
前記映像に沿った映像座標系で位置が表された測定点を含む測定用映像を生成し、その測定用映像の信号を前記投影装置に出力する測定用映像生成機能と、
前記位置検出装置から入力した前記測定点の検出位置を入力して記憶する測定機能と、
前記投影装置から初期投影パラメータを入力して記憶する初期投影パラメータ入力機能と、
前記投影装置の投影パラメータが前記初期投影パラメータから第二投影パラメータに変更された場合に前記投影装置から前記第二投影パラメータを入力する投影パラメータ再入力機能と、
前記映像座標系で表された前記測定点の位置、前記測定機能により記憶した前記測定点の検出位置、前記初期投影パラメータ入力機能により記憶した前記初期投影パラメータ及び前記投影パラメータ再入力機能により入力した前記第二投影パラメータから座標変換用のパラメータを演算するキャリブレーション機能と、
前記キャリブレーション機能により演算された前記座標変換用のパラメータを利用して前記位置検出装置から入力した検出位置の座標系を前記検出座標系から前記映像座標系に変換する座標変換機能と、
を実現させるためのプログラム。 Although the embodiment of the present invention and the modification thereof have been described above, the technical scope of the present invention is not limited to the above-described embodiment or modification, and is described above without departing from the spirit and the gist of the present invention. Embodiments modified from these embodiments also belong to the technical scope of the present invention. Further, the technical scope of the present invention is determined based on the description of the scope of claims, and equivalent scopes obtained by modifying the scope of the claims and not related to the essence of the present invention are also included in the present invention. Is included in the technical scope.
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.
[Appendix]
<Claim 1>
A computer that outputs video signals;
A projection device connected to the computer and displaying a video according to the video signal detects a user's designated position on the screen on which the video is projected so as to be represented by a detection coordinate system along the screen, and the detection position is detected. A position detection device that outputs to the computer,
The computer is
A measurement image generation function for generating a measurement image including a measurement point whose position is represented in an image coordinate system along the image, and outputting a signal of the measurement image to the projection device;
A measurement function for inputting and storing the detection position of the measurement point input from the position detection device;
An initial projection parameter input function for inputting and storing an initial projection parameter from the projection device;
A projection parameter re-input function for inputting the second projection parameter from the projection device when the projection parameter of the projection device is changed from the initial projection parameter to the second projection parameter;
The position of the measurement point represented in the video coordinate system, the detection position of the measurement point stored by the measurement function, the initial projection parameter stored by the initial projection parameter input function, and the input by the projection parameter re-input function A calibration function for calculating parameters for coordinate transformation from the second projection parameters;
A coordinate conversion function for converting the coordinate system of the detection position input from the position detection device from the detection coordinate system to the video coordinate system using the coordinate conversion parameters calculated by the calibration function; ,
A computer input system.
<Claim 2>
The projection parameter of the projection device is a slow ratio,
The computer input system according to claim 1.
<Claim 3>
The number of measurement points is 4, and the positions of these measurement points in the video coordinate system are (x0, y0), (x0, y1), (x1, y0) and (x1, y1), respectively, and the measurement function (X0, Y0), (X0, Y1), (X1, Y0), and (X1, Y1) are stored as the initial projection parameters stored by the initial projection parameter input function. Is set to TR0, the slow ratio as the second projection parameter input by the projection parameter re-input function is set to TRn, and the coordinate conversion parameters calculated by the calibration function are set to A and B. The coordinate conversion function converts the coordinate system of the detection position input from the position detection device from the detection coordinate system to the video coordinate system according to the following equation (1):
The computer input system according to claim 2.

However, (X, Y) represents the detection position detected by the position detection device in the detection coordinate system, and (x, y) represents the detection position detected by the position detection device as the video coordinates. It is expressed in a system.
<Claim 4>
The projection parameter of the projection device includes a lateral scale parameter obtained by dividing a lateral resolution of an image projected by the projection device by a lateral resolution of an image input to the projection device, and the projection device. The vertical scale parameter obtained by dividing the vertical resolution of the projected video by the vertical resolution of the video input to the projection device.
The computer input system according to claim 1.
<Claim 5>
The number of measurement points is 4, and the positions of these measurement points in the video coordinate system are (x0, y0), (x0, y1), (x1, y0) and (x1, y1), respectively, and the measurement function (X0, Y0), (X0, Y1), (X1, Y0), and (X1, Y1) are stored as the initial projection parameters stored by the initial projection parameter input function. SPx0 as the horizontal scale parameter, and SPy0 as the vertical scale parameter as the initial projection parameter stored by the initial projection parameter input function, and the horizontal direction as the second projection parameter input by the projection parameter re-input function The scale parameter is SPxn, and the vertical scale parameter as the second projection parameter input by the projection parameter re-input function is used. If the parameter is SPyn and the parameters for coordinate conversion calculated by the calibration function are A and B, the coordinate conversion function uses the coordinate system of the detection position input from the position detection device as the following equation (1): Converting from the detected coordinate system to the video coordinate system according to
The computer input system according to claim 4.

However, (X, Y) represents the detection position detected by the position detection device in the detection coordinate system, and (x, y) represents the detection position detected by the position detection device as the video coordinates. It is expressed in a system.
<Claim 6>
The projection parameter of the projection device is a lateral scale parameter obtained by dividing the horizontal resolution of the image projected by the projection device by the lateral resolution of the image input to the projection device, and the projection device A vertical scale parameter and a slow ratio obtained by dividing the vertical resolution of the projected video by the vertical resolution of the video input to the projector;
The computer input system according to claim 1.
<Claim 7>
The number of measurement points is 4, and the positions of these measurement points in the video coordinate system are (x0, y0), (x0, y1), (x1, y0) and (x1, y1), respectively, and the measurement function (X0, Y0), (X0, Y1), (X1, Y0), and (X1, Y1) are stored as the initial projection parameters stored by the initial projection parameter input function. The horizontal scale parameter is SPx0, the vertical scale parameter as the initial projection parameter stored by the initial projection parameter input function is SPy0, and the slow ratio as the initial projection parameter stored by the initial projection parameter input function is TR0, and the horizontal scale parameter as the second projection parameter input by the projection parameter re-input function is S Pxn, the vertical scale parameter as the second projection parameter input by the projection parameter re-input function is SPyn, the slow ratio as the second projection parameter input by the projection parameter re-input function is TRn, Assuming that the parameters calculated by the calibration function are A and B, the coordinate conversion function changes the coordinate system of the detection position input from the position detection device from the detection coordinate system to the video coordinate system according to the following equation (1). Convert,
The computer input system according to claim 6.

However, (X, Y) represents the detection position detected by the position detection device in the detection coordinate system, and (x, y) represents the detection position detected by the position detection device as the video coordinates. It is expressed in a system.
<Claim 8>
The detection position is input from the position detection device that detects the user's designated position on the screen on which the image is projected by the projection device so as to be represented by the detection coordinate system along the screen, and the video signal is output to the projection device. Equipped with a computer
The computer is
A measurement image generation function for generating a measurement image including a measurement point whose position is represented in an image coordinate system along the image, and outputting a signal of the measurement image to the projection device;
A measurement function for inputting and storing the detection position of the measurement point input from the position detection device;
An initial projection parameter input function for inputting and storing an initial projection parameter from the projection device;
A projection parameter re-input function for inputting the second projection parameter from the projection device when the projection parameter of the projection device is changed from the initial projection parameter to the second projection parameter;
The position of the measurement point represented in the video coordinate system, the detection position of the measurement point stored by the measurement function, the initial projection parameter stored by the initial projection parameter input function, and the input by the projection parameter re-input function A calibration function for calculating parameters for coordinate transformation from the second projection parameters;
A coordinate conversion function for converting the coordinate system of the detection position input from the position detection device from the detection coordinate system to the video coordinate system using the coordinate conversion parameters calculated by the calibration function; ,
A coordinate conversion device characterized by that.
<Claim 9>
The detection position is input from the position detection device that detects the user's designated position on the screen on which the image is projected by the projection device so as to be represented by the detection coordinate system along the screen, and the video signal is output to the projection device. On the computer,
A measurement image generation function for generating a measurement image including a measurement point whose position is represented in an image coordinate system along the image, and outputting a signal of the measurement image to the projection device;
A measurement function for inputting and storing the detection position of the measurement point input from the position detection device;
An initial projection parameter input function for inputting and storing an initial projection parameter from the projection device;
A projection parameter re-input function for inputting the second projection parameter from the projection device when the projection parameter of the projection device is changed from the initial projection parameter to the second projection parameter;
The position of the measurement point represented in the video coordinate system, the detection position of the measurement point stored by the measurement function, the initial projection parameter stored by the initial projection parameter input function, and the input by the projection parameter re-input function A calibration function for calculating parameters for coordinate transformation from the second projection parameters;
A coordinate conversion function for converting the coordinate system of the detection position input from the position detection device using the parameter for coordinate conversion calculated by the calibration function from the detection coordinate system to the video coordinate system;
A program to realize

DESCRIPTION OF SYMBOLS 1 Computer input system 2 Screen 3 Projection apparatus 4 Position detection apparatus 6 Coordinate conversion apparatus 61 Computer 61a Detection position input function 61b Click signal input function 61c Coordinate conversion function 61d Measurement image generation function 61e Measurement function 61f Initial calibration function 61g Initial projection Parameter input function 61h Projection parameter re-input function 61i Re-calibration function 62 Storage medium 62a Program

Claims (9)

A computer that outputs video signals;
A projection device connected to the computer and displaying a video according to the video signal detects a user's designated position on the screen on which the video is projected so as to be represented by a detection coordinate system along the screen, and the detection position is detected. A position detection device that outputs to the computer,
The computer is
A measurement image generation function for generating a measurement image including a measurement point whose position is represented in an image coordinate system along the image, and outputting a signal of the measurement image to the projection device;
A measurement function for inputting and storing the detection position of the measurement point input from the position detection device;
An initial projection parameter input function for inputting and storing an initial projection parameter from the projection device;
A projection parameter re-input function for inputting the second projection parameter from the projection device when the projection parameter of the projection device is changed from the initial projection parameter to the second projection parameter;
The position of the measurement point represented in the video coordinate system, the detection position of the measurement point stored by the measurement function, the initial projection parameter stored by the initial projection parameter input function, and the input by the projection parameter re-input function A calibration function for calculating parameters for coordinate transformation from the second projection parameters;
A coordinate conversion function for converting the coordinate system of the detection position input from the position detection device from the detection coordinate system to the video coordinate system using the coordinate conversion parameters calculated by the calibration function; ,
A computer input system. The projection parameter of the projection device is a slow ratio,
The computer input system according to claim 1. The number of measurement points is 4, and the positions of these measurement points in the video coordinate system are (x0, y0), (x0, y1), (x1, y0) and (x1, y1), respectively, and the measurement function (X0, Y0), (X0, Y1), (X1, Y0), and (X1, Y1) are stored as the initial projection parameters stored by the initial projection parameter input function. Is set to TR0, the slow ratio as the second projection parameter input by the projection parameter re-input function is set to TRn, and the coordinate conversion parameters calculated by the calibration function are set to A and B. The coordinate conversion function converts the coordinate system of the detection position input from the position detection device from the detection coordinate system to the video coordinate system according to the following equation (1):
The computer input system according to claim 2.

However, (X, Y) represents the detection position detected by the position detection device in the detection coordinate system, and (x, y) represents the detection position detected by the position detection device as the video coordinates. It is expressed in a system. The projection parameter of the projection device includes a lateral scale parameter obtained by dividing a lateral resolution of an image projected by the projection device by a lateral resolution of an image input to the projection device, and the projection device. The vertical scale parameter obtained by dividing the vertical resolution of the projected video by the vertical resolution of the video input to the projection device.
The computer input system according to claim 1. The number of measurement points is 4, and the positions of these measurement points in the video coordinate system are (x0, y0), (x0, y1), (x1, y0) and (x1, y1), respectively, and the measurement function (X0, Y0), (X0, Y1), (X1, Y0), and (X1, Y1) are stored as the initial projection parameters stored by the initial projection parameter input function. SPx0 as the horizontal scale parameter, and SPy0 as the vertical scale parameter as the initial projection parameter stored by the initial projection parameter input function, and the horizontal direction as the second projection parameter input by the projection parameter re-input function The scale parameter is SPxn, and the vertical scale parameter as the second projection parameter input by the projection parameter re-input function is used. If the parameter is SPyn and the parameters for coordinate conversion calculated by the calibration function are A and B, the coordinate conversion function uses the coordinate system of the detection position input from the position detection device as the following equation (1): Converting from the detected coordinate system to the video coordinate system according to
The computer input system according to claim 4.

However, (X, Y) represents the detection position detected by the position detection device in the detection coordinate system, and (x, y) represents the detection position detected by the position detection device as the video coordinates. It is expressed in a system. The projection parameter of the projection device is a lateral scale parameter obtained by dividing the horizontal resolution of the image projected by the projection device by the lateral resolution of the image input to the projection device, and the projection device A vertical scale parameter and a slow ratio obtained by dividing the vertical resolution of the projected video by the vertical resolution of the video input to the projector;
The computer input system according to claim 1. The number of measurement points is 4, and the positions of these measurement points in the video coordinate system are (x0, y0), (x0, y1), (x1, y0) and (x1, y1), respectively, and the measurement function (X0, Y0), (X0, Y1), (X1, Y0), and (X1, Y1) are stored as the initial projection parameters stored by the initial projection parameter input function. The horizontal scale parameter is SPx0, the vertical scale parameter as the initial projection parameter stored by the initial projection parameter input function is SPy0, and the slow ratio as the initial projection parameter stored by the initial projection parameter input function is TR0, and the horizontal scale parameter as the second projection parameter input by the projection parameter re-input function is S Pxn, the vertical scale parameter as the second projection parameter input by the projection parameter re-input function is SPyn, the slow ratio as the second projection parameter input by the projection parameter re-input function is TRn, Assuming that the parameters calculated by the calibration function are A and B, the coordinate conversion function changes the coordinate system of the detection position input from the position detection device from the detection coordinate system to the video coordinate system according to the following equation (1). Convert,
The computer input system according to claim 6.

However, (X, Y) represents the detection position detected by the position detection device in the detection coordinate system, and (x, y) represents the detection position detected by the position detection device as the video coordinates. It is expressed in a system. The detection position is input from the position detection device that detects the user's designated position on the screen on which the image is projected by the projection device so as to be represented by the detection coordinate system along the screen, and the video signal is output to the projection device. Equipped with a computer
The computer is
A measurement image generation function for generating a measurement image including a measurement point whose position is represented in an image coordinate system along the image, and outputting a signal of the measurement image to the projection device;
A measurement function for inputting and storing the detection position of the measurement point input from the position detection device;
An initial projection parameter input function for inputting and storing an initial projection parameter from the projection device;
A projection parameter re-input function for inputting the second projection parameter from the projection device when the projection parameter of the projection device is changed from the initial projection parameter to the second projection parameter;
The position of the measurement point represented in the video coordinate system, the detection position of the measurement point stored by the measurement function, the initial projection parameter stored by the initial projection parameter input function, and the input by the projection parameter re-input function A calibration function for calculating parameters for coordinate transformation from the second projection parameters;
A coordinate conversion function for converting the coordinate system of the detection position input from the position detection device from the detection coordinate system to the video coordinate system using the coordinate conversion parameters calculated by the calibration function; ,
A coordinate conversion device characterized by that. The detection position is input from the position detection device that detects the user's designated position on the screen on which the image is projected by the projection device so as to be represented by the detection coordinate system along the screen, and the video signal is output to the projection device. On the computer,
A measurement image generation function for generating a measurement image including a measurement point whose position is represented in an image coordinate system along the image, and outputting a signal of the measurement image to the projection device;
A measurement function for inputting and storing the detection position of the measurement point input from the position detection device;
An initial projection parameter input function for inputting and storing an initial projection parameter from the projection device;
A projection parameter re-input function for inputting the second projection parameter from the projection device when the projection parameter of the projection device is changed from the initial projection parameter to the second projection parameter;
The position of the measurement point represented in the video coordinate system, the detection position of the measurement point stored by the measurement function, the initial projection parameter stored by the initial projection parameter input function, and the input by the projection parameter re-input function A calibration function for calculating parameters for coordinate transformation from the second projection parameters;
A coordinate conversion function for converting the coordinate system of the detection position input from the position detection device using the parameter for coordinate conversion calculated by the calibration function from the detection coordinate system to the video coordinate system;
A program to realize

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