JP2000241874A - Method and device for automatically adjusting screen position for projector - Google Patents

Method and device for automatically adjusting screen position for projector

Info

Publication number
JP2000241874A
JP2000241874A JP11041428A JP4142899A JP2000241874A JP 2000241874 A JP2000241874 A JP 2000241874A JP 11041428 A JP11041428 A JP 11041428A JP 4142899 A JP4142899 A JP 4142899A JP 2000241874 A JP2000241874 A JP 2000241874A
Authority
JP
Japan
Prior art keywords
screen
adjusting
image
projector
adjustment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11041428A
Other languages
Japanese (ja)
Inventor
Kazunori Ozawa
一徳 小澤
Original Assignee
Nec Corp
日本電気株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nec Corp, 日本電気株式会社 filed Critical Nec Corp
Priority to JP11041428A priority Critical patent/JP2000241874A/en
Publication of JP2000241874A publication Critical patent/JP2000241874A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179Video signal processing therefor
    • H04N9/3185Geometric adjustment, e.g. keystone or convergence

Abstract

(57) [Summary] [PROBLEMS] To automatically perform focus adjustment, zoom adjustment to a screen frame, trapezoidal distortion adjustment, and the like. SOLUTION: A projector 2 fixed to face a screen 1 processes a monitor camera 3 installed on the front surface of the projector main body and information of a video signal inputted from the monitor camera 3 to adjust a focus adjustment value and zooming. A CPU 4 of a calculation unit for calculating an adjustment value and a trapezoidal distortion adjustment value;
A display drive unit 6 that adjusts the projection lens 5 to perform focus adjustment, zooming adjustment, and trapezoidal distortion adjustment, and an input image data conversion unit 7 that converts an input image into display data and outputs the display data to the display drive unit 6. Have.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display system for projecting an image on a large screen by a CRT projector or a liquid crystal projector, and more particularly, to a screen position of a portable projector in which the relative position between the projector and the screen is variable. Related to adjustment technology.

[0002]

2. Description of the Related Art Various means have been disclosed for the above-described projector screen adjusting method.

[0003] For example, as for focus adjustment, like a general auto-focus camera, a technique of measuring a distance to an object using infrared rays or ultrasonic waves, and automatically adjusting the focus of a lens according to the distance. It has been known. As one example, Japanese Patent Application Laid-Open No. 4-338706 discloses an "auto focus projector" which measures the propagation time of an ultrasonic signal reflected by a screen in order to automatically adjust the focus of a portable projection device. The focus adjustment of the projection lens is performed based on the measured distance by using the transmission / reception element and the zero-cross circuit.

Japanese Patent Application Laid-Open No. 08-088860 discloses an "automatic image distortion correction apparatus" for automatically adjusting raster distortion and convergence of a CRT video projector. A part of the image is magnified by a camera via a movable mirror, the image signal is converted into digital data, and the image is processed by a CPU. It is disclosed that a correction signal is created by automatically measuring a convergence deviation amount. The drive control position of the imaging means for imaging the corner of the screen is input by the adjuster.

[0005] Japanese Patent Application Laid-Open No. 10-090795 discloses an "image display system and a focusing method" which discloses a spatial light modulator (SL) for modulating light from a light source to form an image composed of pixels.
M) an optical system for focusing an image formed by the spatial light modulator on an image plane, a sensor for sensing a focus of at least one pixel projected on the image plane and providing a sensor output, and an optical system. Adjusting the parameters of the SLM as a function of the sensor output by irradiating the SLM with light to determine an image of pixels on the image plane for display, sensing the sharpness of at least one pixel of the image, By adjusting the optical parameters of the optical system as a function of the perceived pixel sharpness, the focus is established by sensing the sharpness of the individual pixels generated by the SLM, rather than the sharpness of the projected image. ing.

[0006] Japanese Patent Application Laid-Open No. 10-161243 discloses a method and apparatus for adjusting the focus of a three-panel liquid crystal projector.
In order to accurately and quickly adjust the focus of the screen of each color of the red and blue three-panel liquid crystal projectors in a short time, a CCD camera that captures a color image of the projected image projected on the screen by the three-panel liquid crystal projector, and shooting An A / D converter for digitizing the three color video signals, an image memory for storing digital data of each color, an arithmetic unit for digitizing the degree of focus for each color as a focus value, and a display unit. The focus distribution of the projected image of each color is obtained, and the focus is adjusted based on the distribution data.

Further, Japanese Patent No. 2766229 (Japanese Patent Laid-Open No.
The method disclosed in “Color Projector Focusing Apparatus” of Japanese Patent Application Laid-Open No. H11-26083, focuses on the entire projection screen on a color projector screen, which enlarges an image of a color liquid crystal display with a projection lens and projects it on a screen. To make adjustments, image the projected screen of the screen and
A TV camera that outputs the G and B signals, respectively, and values indicating the fluctuations of the signal levels of the R, G, and B signals in each of the focus confirmation areas set in the center and the periphery of the projection screen are calculated. Level fluctuation calculating means, liquid crystal angle adjusting means for adjusting the angle of the liquid crystal surface of the color liquid crystal display, lens position adjusting means for adjusting the focus by moving the projection lens, and based on the calculated value for each focusing confirmation area Focusing control means for controlling the liquid crystal angle adjusting means and the lens position adjusting means, respectively, projecting an all-white image on the screen, capturing the projection screen at once with a color TV camera, and centrally and peripherally of the projection screen. The focus control is performed based on the level fluctuation width of the R, G, and B signals of each imaging pixel in the focus confirmation area set in advance in the portion.

[0008]

In recent years, projectors,
In particular, high-performance portable projectors have emerged, and when used together with a notebook computer, they have created an opportunity for presentations that can be easily moved. At that time, not only the setting of the notebook computer but also the setting of the projector are necessary, but the adjustment for the setting requires time and skill, which is a burden on the user.

In particular, in setting a portable projector, first, the projector and the screen are opposed to each other and fixed on a floor, a desk, or another fixed base, and then the brightness of the screen is adjusted and the focus of the projected image on the screen is adjusted. In addition to the above, zoom adjustment to enlarge and reduce the projected image to the screen frame of the screen, and adjustment of the trapezoidal distortion of the screen due to the projected light beam being projected obliquely from the top and bottom, or left and right directions, etc. Although it is necessary to perform such adjustment, the conventional automatic adjustment means is limited to substantially autofocus, and the user manually performs all other adjustments, which requires time and skill.

An object of the present invention is to provide a projector device for enlarging an input signal and displaying the enlarged image on a screen without performing complicated adjustments after installation, such as focus adjustment, zoom adjustment up to a screen frame, and trapezoidal distortion adjustment. An object of the present invention is to provide a method and an apparatus for automatically adjusting a position of a projector screen that can automatically adjust the position.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a monitor camera is provided in an apparatus, and various adjustments required for display are automatically performed by monitoring a projection screen.

That is, the automatic screen position adjusting device for a projector according to the present invention is provided with a projection lens capable of adjusting focus, zooming, elevation angle adjustment, and tilting operation, and is provided on the front surface of the projector main body to display a projection screen on a screen. A monitor camera for capturing an image, data conversion means for converting information of a video signal input from the monitor camera into digital data and storing the digital data, arithmetic means for arithmetically processing the digital data converted by the data conversion means, and a focus of the projector Adjusting means, zooming driving means for zooming the projection lens of the projector, screen position detecting means for detecting the position of the screen within the imaged screen input from the monitor camera, and the position of the screen detected by the screen position detecting means. The projection light of the projector is It has a projection direction adjustment means for directing the axis in the center of the screen, and a trapezoidal distortion adjustment means for adjusting the keystone distortion of the projection screen by the data in the position of the screen detected by the screen position detector.

The data conversion means converts at least information representing the position and luminance of each pixel on a scanning line from the video signal input from the monitor camera into digital data and stores the digital data.

The focus adjusting means may be a distance measuring method using ultrasonic waves.

In the automatic screen position adjusting method for a projector according to the present invention, a predetermined test pattern is projected from a projector onto a screen, an image of the test pattern on the screen is captured by a monitor camera, and data of the captured monitor image is analyzed. To adjust the focus of the projector,
Next, the test pattern is changed to an all-white square screen, projected on the screen, imaged by the monitor camera, the screen position and the peripheral end points in the monitor screen are detected, and the projected light is directed toward the center of the detected screen. Move the optical axis of
The trapezoidal distortion is verified by comparing the lengths of the opposite sides of the screen in the captured monitor screen, and the trapezoidal distortion of the projection screen is adjusted based on the verification result.

The trapezoidal distortion can be adjusted by a projection lens having an optical tilting device or by correcting display image data input to the projection lens.

[0017]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of an automatic screen position adjusting device for a projector according to the present invention.
FIG. 3 is a flowchart of an embodiment of the present invention, FIG. 3 is an embodiment of a focus adjustment test pattern, FIG. 4 is an explanatory diagram of focus adjustment, and FIG. 5 is an explanatory diagram of projection screen position adjustment.

Referring to FIG. 1, an automatic screen position adjusting apparatus according to the present embodiment includes a projection lens 3 capable of adjusting focus, zooming, elevation angle adjustment, and tilting operation, and a monitor camera 4 installed on the front of the projector main body. , Monitor camera 4
A focus detection unit 5 for detecting the best point of the focus of the input image, an edge detection unit 6 for detecting the position of the screen in the monitor screen, and calculating a focus adjustment value, a zooming adjustment value, and a trapezoidal distortion adjustment value. Calculation unit C
By adjusting the PU 7 and the projection lens 3, focus adjustment,
A display drive unit for performing zooming adjustment, elevation angle adjustment, and trapezoidal distortion adjustment; and an input image data conversion unit for converting an input image into display data and outputting the display data to the display drive unit. And is fixed by a projector 2.

Next, the operation of this embodiment will be described with reference to FIG.

First, after the user fixes the main body of the projector 2 so as to substantially face the screen 1, the user activates the automatic screen position adjusting device.

After initializing the set values of the respective sections of the projector (step S1), the automatic screen position adjusting device projects a predetermined test pattern from the projection lens 3 of the projector 2 (step S2). For example, as shown in FIG. 3, a plurality of black straight lines perpendicular to the scanning direction of the monitor camera are arranged on a white or transparent plane, and the test pattern has an amplitude of a light amount change and a horizontal scanning. It is preferable that the frequency component be high.

The test pattern projected from the projector is reflected by the screen and the wall behind the screen. The monitor camera receives the reflected light and captures an image of the projection screen (step S3).

The focus detecting section 5 analyzes the data of the captured monitor image and detects the best focus by detecting the presence of a high peak value of the amplitude of the horizontal signal or the presence or absence of a high-order frequency component by Fourier series expansion. A point is detected (step S4). In this case, the best point of the focus to be obtained can be set to one point near the center of the imaging screen, or the average focus of the entire screen including the peripheral part can be made the best.

When the best point of focus is detected, the focus of the projection lens is adjusted (step S5).
Thereafter, an all-white screen is projected from the projector in the direction of the screen, and the image is monitored (step S6).

Next, a point at which the luminance of the reflected light greatly changes on the horizontal scanning line of the monitor screen is detected, and the position of the screen within the monitor screen is detected as an end point of the screen (step S7).

Next, the projection lens of the projector is zoomed to reduce or enlarge the projection range until the projection screen reaches the end point of the screen (step S8).

Next, the orientation of the front surface of the projector main body or the elevation angle of the projection lens is adjusted so that the screen image is positioned at the center of the screen within the monitor screen (step S9). Thereby, the optical axis of the projection lens is directed to the center of the screen, and an image is projected on the center of the screen.

Next, trapezoidal distortion is verified by comparing the lengths of the opposite sides of the screen in the captured monitor screen, and the trapezoidal distortion of the projection screen is adjusted based on the verification result (step S1).
0). To detect the position of the screen within the image screen of the monitor camera, after performing focus adjustment, project an all-white screen from the projector toward the screen, zoom the projection lens of the projector, and gradually reduce or enlarge the projection range While measuring the total light amount of the monitor screen and detecting the boundary point where the influence of the reflected light from the screen background disappears and the light amount of the entire monitor screen becomes almost constant, zooming is stopped and the boundary point is stopped. The position of the screen is detected using the position of the screen as the end point of the screen, and the difference in brightness between the inside and outside around the detected screen is compared for each of the upper, lower, left and right opposing sides, and a trapezoid generated around the projected image The distortion may be tested.

In the case of a CRT projector, the trapezoidal distortion can be adjusted by changing the amplitude voltage range of the projected image depending on the location on the screen.

In an LCD projector, correction can be made by adjusting the position of the projection lens (lens shift) and using the "tilt" effect, or by electrically interpolating data.

The CPU 7 calculates the data for these corrections from the edge detection data and sends the data to the display drive unit 6.
Match the screen frame with the display image.

Further, in this embodiment, the monitor camera is used for the focus adjustment, but the focus adjustment using ultrasonic waves may be performed.

In this embodiment, a monitor camera is provided on the front of the projector, and a test pattern on the screen projected from the projector is imaged and analyzed by the monitor camera.
Zooming adjustment up to the screen frame and trapezoidal distortion adjustment can be automatically performed, and it is not necessary to perform the conventionally required complicated adjustment after installation.

[0035]

As described above, the present invention captures a test pattern on a screen projected from a projector by a monitor camera, analyzes the data, analyzes the data, and adjusts the screen frame in addition to the focus adjustment of the projector based on the analysis result. By automatically performing the zooming adjustment and trapezoidal distortion adjustment up to this point, the screen position of the projector can be adjusted quickly and easily even by unskilled persons without the troublesome adjustment after installation, which was required conventionally. There is an effect that can be adjusted.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of an automatic screen position adjusting device according to the present invention.

FIG. 2 is a flowchart of an embodiment of an automatic screen position adjusting method for a projector according to the present invention.

FIG. 3 is an example of a focus adjustment test pattern.

FIG. 4 is an explanatory diagram of focus adjustment.

FIG. 5 is an explanatory diagram of projection screen position adjustment.

[Explanation of symbols]

 1. Screen 2. Projector 3. 3. Projection lens Monitor camera 5. Focus detection unit 6. Edge detection section 7. CPU8. Display drive unit 9. Input image data conversion unit S1 to S10 Step

Claims (8)

[Claims]
1. A screen position adjusting device for an image display system for adjusting a position of a screen projected from a projector onto a screen, comprising: a projection lens capable of adjusting focus, zooming, elevation angle adjustment, and tilt; A monitor camera that is installed on the front side and captures an image projected on the screen; a data conversion unit that converts information of a video signal input from the monitor camera into digital data and stores the digital data; Arithmetic means for arithmetically processing digital data; focus adjusting means for the projection lens; zooming driving means for zooming the projection lens; screen position detecting means for detecting the position of the screen in the screen imaged by the monitor camera; Depending on the detected screen position data, Projection direction adjusting means for adjusting the elevation angle of the lens; and trapezoidal distortion adjusting means for adjusting trapezoidal distortion of the projection screen based on the detected screen position data. apparatus.
2. The projector according to claim 1, wherein the data conversion means converts at least information representing a position and a luminance of each pixel on a scanning line from a video signal input from a monitor camera into digital data and stores the digital data. Automatic screen position adjustment device.
3. The automatic screen position adjusting device for a projector according to claim 1, further comprising a focus adjusting means of a distance measuring method using an ultrasonic wave.
4. A screen position adjusting method for an image display system for adjusting a position of a screen projected from a projector onto a screen, wherein a predetermined test pattern is projected from the projector onto the screen, and an image of the test pattern on the screen is monitored. An image is taken with a camera, the focus of the projector is adjusted by analyzing the image data of the taken test pattern, and then the test pattern is changed to an all-white square screen and projected on a screen, and the all-white image taken with a monitor camera is taken. Detecting the position of the screen within the screen, zooming the projection lens to enlarge or reduce the projected screen up to the detected screen position, and reducing the trapezoidal distortion from the positions of the screen endpoint and the all-white screen endpoint A project characterized by calculating an adjustment value and adjusting a trapezoidal distortion of a projected image. Automatic screen position adjustment method of data.
5. A method for detecting a position of a screen in an image screen of the monitor camera, wherein the monitor camera captures an image of an all-white screen projected from a projector toward the screen, and changes in luminance of a scanning line of the image screen. The method according to claim 4, wherein the point is determined as an end point of the screen.
6. The adjustment value of the trapezoidal distortion is a distance from a position of an end point of the screen in the imaged all-white screen to an end point of the all-white screen extended in the horizontal direction and the vertical direction. 6. The method according to claim 4, wherein calculation is performed for each of the left and right sides and the left and right sides are calculated and compared.
7. The method according to claim 4, wherein the trapezoidal distortion is adjusted by a projection lens having an optical tilt device.
8. The method according to claim 4, wherein the trapezoidal distortion is adjusted by correcting display image data input to a projection lens.
JP11041428A 1999-02-19 1999-02-19 Method and device for automatically adjusting screen position for projector Pending JP2000241874A (en)

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