JP2006201673A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector having a wide projection range where a video is projected and projecting the video to a desired place in the projection range, and a projector having a wide projection range, automatically detecting a screen arranged in the projection range and automatically adjusting a projected video so as to nearly agree with the detected screen. <P>SOLUTION: The projection part 1 of the projector 100 projects the video in a direction inclined according to the projecting length of the support 4a of a foot part 4 from a main body part 50 at a position obtained by rotationally moving the main body part 50 centering a fixed leg 3 by the rotating leg 4b of the foot part 4. In the projector 100, a range including the projected video is image-picked up by a CCD 2, and imaging data is analyzed by a video analysis part, and then foot adjustment by the foot part 4, and zoom adjustment and lens shift by the projection part 1 are performed so that the position and the size of the projected video agree with the detected position and size of the screen. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector that can move the projection position of an image, detects the position of a screen that projects an image, and automatically adjusts and projects the image so as to match the shape of the screen.

  As a technique for adjusting the position of an image projected by a projector, a lens shift function is known that moves the position of a projected image by moving the position of a projection lens that magnifies and projects the image. For example, the projector described in Patent Document 1 moves the projection lens within a range in which rectangular light representing the image from the liquid crystal panel falls within the circular outer periphery of the projection lens formed of a convex lens, thereby moving the position of the projected image. Can be moved. Although there is no description about the amount of movement of the projected image, considering the projection lens aperture of a normal projector, the lens shift function can move the position of the projected image up, down, left, and right about half of the screen of the projected image.

There is also a projector that automatically adjusts the projected image to match the shape of the screen by capturing the screen with an imaging unit such as a built-in area sensor and analyzing the captured image to detect the shape of the screen. Are known. For example, the projector described in Patent Document 2 automatically analyzes the brightness of various captured test pattern images and detects the optimal zoom and focus state of the projected image, thereby automatically adjusting the zoom and focus of the projected image. Match the screen.
The projector described in Patent Document 3 projects an image that matches the shape of the screen by performing trapezoidal distortion correction on the video signal so that the image projected by the imaging unit matches the shape of the screen. The image pickup section of these projectors needs an image pickup range that is slightly larger than the screen so that the entire screen can be confirmed.

JP 2001-215610 A Japanese Patent Laid-Open No. 8-292396 JP 2004-260785 A

However, the amount of movement by which the projected image can be moved by the lens shift function of Patent Document 1 is as small as about half of the screen of the projected image, which is insufficient when actually used. For example, if the projector is projecting an image on one of two adjacent screens side by side and you want to move the projected image to the other screen, the amount of movement of the lens shift function It has been difficult to move the projected image so as to match one of the screens. As described above, since the projector disclosed in Patent Document 1 has a small amount of movement of the projected image by the lens shift function, the projection range indicating the projectable range of the projected image is narrow and the image cannot be projected to a desired place. There was a point.
In addition, since the imaging range of the imaging unit of the projector that automatically adjusts the video so as to match the detected screen, such as Patent Document 2 and Patent Document 3, is slightly larger than the screen, the user who uses the projector When installing the projector, it was necessary to install the projector with high accuracy so that the screen was almost within the imaging range. As described above, the projectors of Patent Document 2, Patent Document 3, and the like have a problem in that the range in which the screen can be detected is not sufficient, and the corresponding range of automatic adjustment is narrow.

  In order to solve such a problem, in the present invention, a projection range in which an image can be projected is wide, a projector capable of projecting an image to a desired location within the projection range, and a projection range is wide. It is an object of the present invention to provide a projector that automatically detects a screen installed therein and automatically adjusts a projected image so as to substantially match the detected screen.

  To achieve the above object, a projector according to the present invention is a projector that is supported by a plurality of legs including at least one movable leg and projects an image on a screen, and includes a light source unit that supplies light, and a light source unit An optical unit including a light modulation element that converts the light of the light into a modulated light modulated in accordance with a video signal that defines an image, and represents the projected image projected on the screen by expanding the modulated light emitted from the optical unit A projection unit that generates projection light; a main unit that is a main body of the projector including at least the projection unit; a fixed leg that supports the main unit and serves as a fulcrum when the main unit rotates in a horizontal direction; A rotating leg that is provided below and rotates the main body in a substantially horizontal direction around the fixed leg, connects the rotating leg and the main body, and changes the protruding length from the main body to make the fixed leg a fulcrum. The projection unit includes a foot part as a movable leg having an extendable support column that tilts the main body part and moves the position of the projected image by the projection light from the projection part in a substantially vertical direction. An image is projected along a direction inclined according to the protruding length of the support column of the foot portion at a position rotated about the fixed leg by the rotating leg.

According to this configuration, the projection unit displays an image along a direction inclined according to the protruding length of the support column of the foot unit at a position where the main body unit is rotated about the fixed leg by the rotary unit of the foot unit. Since the projection is performed, the projector projects an image within a range corresponding to the allowable extension / contraction length of the support of the foot portion in the horizontal direction and 360 degrees in the vertical direction.
Therefore, the projector according to the present invention has a wide projection range in which an image can be projected, unlike a conventional projector in which the amount of movement of the projected image by the lens shift function is only about half of the screen of the projected image. An image can be projected to a desired location from the wide projection range by setting the foot.
Therefore, it is possible to provide a projector that has a wide projection range in which an image can be projected and can project an image to a desired place within the projection range.

  According to the projector of the present invention, the foot portion further includes an actuator that adjusts the protruding length of the support column and an actuator that rotates the rotary leg, and the projection unit projects at least projection light to expand the projection light. A lens and an actuator for adjusting a magnification ratio of the projection lens, and the main body includes an imaging unit provided so as to be able to capture a range including the entire image of the projected image, and at least a screen of the imaging data captured by the imaging unit. Necessary for adjusting the projection direction and magnification of the projection light so that the projected image substantially matches the position and size of the screen detected by the image analysis unit, which detects the position and size. A storage unit that stores information, and a control unit that instructs at least the imaging unit to perform imaging, and the control unit converts the image data captured by the imaging unit into a video solution. Each of the adjustment values for adjusting the projection direction and magnification rate of the projection light according to the detected position and size of the screen is obtained from the information read from the storage unit, and by the obtained adjustment value, It is preferable to drive a plurality of actuators in the foot portion and an actuator that adjusts the magnification of the projection lens.

According to this configuration, the control unit reads from the information read from the storage unit each adjustment value for adjusting the projection direction and magnification of the projection light according to the position and size of the screen detected by the video analysis unit. The projector automatically detects the position and size of the screen, and drives the actuator that adjusts the magnification ratio of the projection lens and the plurality of actuators of the foot unit according to the obtained adjustment value. Automatically adjusts the projected image so that it almost matches.
Accordingly, it is possible to provide a projector that has a wide projection range, automatically detects a screen installed within the projection range, and automatically adjusts a projected image so as to substantially match the detected screen.

  According to the projector of the present invention, the main unit further includes a video signal processing unit that performs processing for correcting the video shape on the video signal, and the video analysis unit further includes the imaging data captured by the imaging unit. The shape of the screen is detected, and the adjustment table in the storage unit corrects the shape of the image defined by the video signal so that the shape of the projected image substantially matches the shape of the screen detected by the image analysis unit. The control unit causes the video analysis unit to analyze the imaging data captured by the imaging unit, and corrects the video shape defined by the video signal corresponding to the detected screen shape. It is preferable to obtain an adjustment value for the image from the information read from the storage unit, and to perform a process for correcting the shape of the video signal in the video signal processing unit by the obtained adjustment value.

According to this configuration, the control unit obtains an adjustment value for correcting the shape of the video defined by the video signal corresponding to the shape of the screen detected by the video analysis unit from the information read from the storage unit. Based on the adjusted value, the video signal processing unit performs processing to correct the shape of the video signal, so the projector automatically detects the screen shape, and the projected image substantially matches the detected screen shape. To automatically adjust.
Accordingly, it is possible to provide a projector that has a wide projection range, automatically detects a screen installed within the projection range, and automatically adjusts a projected image so as to substantially match the detected screen.

  According to the projector of the present invention, the projection unit moves the projection lens on the surface where the optical axis of the modulated light is perpendicular by the actuator and the projection lens for enlarging the modulated light. It has a lens shift part that adjusts the position precisely, the foot part further has an actuator that expands and contracts the support column, and an actuator that rotates the rotary leg, and the main body part is parallel to the optical axis of the central part of the projection light An imaging unit provided with an imaging viewpoint that can capture a range larger than the adjustment range of the position of the projected image by the lens shift unit, and at least a screen is included in the imaging data captured by the imaging unit A video analysis unit for detecting the presence of the image, and a control unit for instructing at least the imaging unit to take an image. The control unit detects a screen by the video analysis unit. It is preferable that the whole picture of the detected screen for driving a plurality of actuators of the foot portion to fit within the adjustment range by the lens shift section.

According to this configuration, when the screen is detected by the video analysis unit, the control unit drives the plurality of actuators of the foot unit so that the entire screen of the detected screen is within the adjustment range by the lens shift unit. The detected screen falls within the adjustment range of the lens shift unit.
Therefore, the foot portion can be within the adjustment range of the lens shift portion capable of accurately adjusting the position of the projected image.

  According to the projector of the present invention, the projection unit further includes an actuator that adjusts the magnification of the projection lens, the video analysis unit further detects the position and size of the screen from the imaging data, and the control unit includes: When the entire screen detected by the video analysis unit is within the adjustment range of the lens shift unit, the lens shift unit and the projection lens are enlarged so that the projected image substantially matches the detected screen position and size. It is preferable to adjust the position and size of the projected image by an actuator that adjusts the rate.

According to this configuration, the control unit allows the lens shift unit and the projection so that the projected image substantially matches the detected position and size of the screen when the entire screen is within the adjustment range of the lens shift unit. Since the position and size of the projected image are adjusted by an actuator that adjusts the magnification ratio of the lens, the position and size of the projected image substantially match the detected screen.
Therefore, it is possible to provide a projector that has a wide projection range, automatically detects a screen installed within the projection range, and automatically adjusts the projected image so as to accurately match the detected screen.

  According to the projector of the present invention, the main unit further includes a video signal processing unit that performs processing for correcting the video shape on the video signal, and the video analysis unit further includes the imaging data captured by the imaging unit. When the entire shape of the screen detected by the image analysis unit falls within the adjustment range of the lens shift unit, the control unit detects the shape of the screen, and the shape of the projected image is changed to the shape of the screen detected by the image analysis unit. It is preferable to cause the video signal processing unit to perform processing for correcting the video shape of the video signal so as to substantially match.

According to this configuration, when the entire picture of the screen falls within the adjustment range of the lens shift unit, the control unit allows the shape of the image of the video signal so that the shape of the projected image substantially matches the detected shape of the screen. Since the image signal processing unit performs the process of correcting the image, the shape of the projected image substantially matches the detected screen.
Therefore, it is possible to provide a projector that has a wide projection range, automatically detects a screen installed within the projection range, and automatically adjusts the projected image so as to accurately match the detected screen.

  A method for adjusting a projected image by a projector according to the present invention includes a foot unit that rotates the projector main body in the horizontal direction and moves the position of the projected image in the horizontal direction and the vertical direction by tilting the projector main body, An image pickup unit provided with an image pickup unit capable of picking up a larger range than a projected image including a screen for projecting an image, and a method for adjusting a projected image of a projector having a larger range than a projected image including a screen by the image pickup unit The step of detecting the position and size of the screen from the captured image data, and the position of the projected image by the foot so that the projected image substantially matches the detected position and size of the screen. And a step of adjusting the size.

Since the projector is rotatable, the projector projects an image in a direction within a range corresponding to an allowable angle of tilt in the horizontal direction and 360 degrees in the horizontal direction. Therefore, the projection range in which an image can be projected is wide.
According to this adjustment method, the imaging unit captures a larger range than the projected image including the screen, the step of detecting the position and size of the screen from the captured imaging data, the detected screen position and And adjusting the position and size of the projected image by the foot so that the projected image substantially matches the size. Therefore, the projected image of the projector substantially matches the position and size of the detected screen. To do.
Therefore, there is provided a method for adjusting a projected image of a projector that has a wide projection range, automatically detects a screen installed within the projection range, and automatically adjusts the projected image to substantially match the detected screen. be able to.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Projector overview>
FIG. 1 is a schematic diagram of the use of a projector according to an embodiment of the present invention. The projector 100 is installed on a desk placed in a room such as a conference room. A screen SC for projecting video is installed on the wall of the conference room.
The projector 100 emits all white projection light from the projection unit 1 that emits projection light representing an image, projects the projection image V based on the projection light onto the wall surface H on which the screen SC is installed, and includes a range including the projection image V. Imaging is performed by a CCD (Charge Couple Device) 2 as an imaging unit. The imaging unit may be any sensor that can detect the luminance distribution within the imaging range, and may be, for example, a raster scan type sensor using laser light.
The CCD 2 is installed adjacent to the projection unit 1 and at a place where an imaging viewpoint can be maintained that is always parallel to the projection optical axis L that is the optical axis at the center of the projection light. Since the distance between the CCD 2 and the projection unit 1 is negligibly small compared to the distance from the projector 100 to the screen SC, the projection unit 1 always projects the CCD 2 from almost the same viewpoint as the projection unit 1. It is possible to capture a range including an image.

In FIG. 1, the screen SC faces the drawing (paper surface). Hereinafter, the viewpoint of facing the screen SC1 is referred to as “screen viewpoint”. A user who uses the projector 100 and a viewer who appreciates an image projected by the projector 100 expect a projected image of the screen SC along the rectangular shape of the screen SC from the screen viewpoint.
In the case of FIG. 1, since the projector 100 is located on the lower right side from the screen SC, the projected video V by the all-white projection light projected by the projector 100 has a shape distorted in a trapezoidal shape.
The projection light projected by the projector 100 is obtained by enlarging the modulated light emitted from a light modulation element such as a rectangular liquid crystal light valve that modulates the light with a video signal. For this reason, when the projector 100 projects projection light onto the screen SC from a position facing the screen SC, the projected image has the same rectangular shape as the shape of the light modulation element. However, as shown in FIG. When projection light is projected onto the SC, the shape of the projected image has distortion.

Q in FIG. 1 is a diagram illustrating a state of the screen SC and a projected image (hereinafter referred to as “projector viewpoint”) when the screen SC is viewed from the CCD 2. The projected image V from the projector viewpoint in FIG. 1 when viewed from the projector 100 is substantially rectangular as indicated by Q in FIG. 1, and on the contrary, the screen SC is observed as a trapezoidally distorted shape. This is because the viewpoint of the CCD 2 is substantially the same as the projection optical axis L of the projection light projected by the projection unit 1, so that when the image is projected on any projection surface, This is because the shape represented by the projected image is observed.
In order for the projector 100 to project an image that matches the screen SC at the screen viewpoint, an image that matches the position, size, and shape of the screen SC observed in Q of FIG. 1 must be projected. Next, a configuration necessary for this will be described.

<Schematic configuration of projector>
FIG. 2 is an external view of the projector 100. The projector 100 includes a main body 50 that is a projector main body having a flat rectangular parallelepiped shape, and a plurality of legs that support the main body 50.
The plurality of legs are composed of three of a fixed leg 3, a foot part 4 as a movable leg, and a follower leg 5, and supports the main body part 50 by the three legs.
The fixed leg 3 includes a fixed column 3a and a leg 3b with the fixed column 3a as an axis. The fixed support 3 a is made of a metal member such as stainless steel and is fixed to the main body 50. The leg 3b is provided so as to be rotatable in the direction of arrow Q about the fixed support 3a through a bearing such as a ball screw. The ground contact surface of the leg 3b is made of an elastic member such as rubber in order to prevent slipping. Moreover, it is good also as a structure which can adjust the length of the fixed leg 3 manually by using the fixed support | pillar 3a as a screw.

The foot 4 includes a support 4a, a servo motor FY as an actuator that adjusts the protruding length of the support 4a from the main body 50, a caterpillar (registered trademark of New Caterpillar Mitsubishi Corporation) -like rotary leg 4b, and a rotary leg. The servo motor FX is used as an actuator for rotating the 4b.
The support column 4a is made of a metal member such as aluminum, and adjusts the length of protrusion from the main body 50 by a rack j provided on the back surface and a plurality of pinions g that transmit the rotation of the rotation shaft of the servo motor FY.
The rotating leg 4b rotates an elastic member made of a caterpillar rubber or the like by a plurality of pinions (not shown) that transmit the rotation of the rotating shaft of the servo motor FX.
The foot portion 4 is provided on the lower surface of the substantially central portion of the surface of the main body portion 50 where the projection unit 1 is installed. The servo motors FX and FY are driven by a drive signal from the foot adjustment unit 6 built in the main body unit 50.

  The following leg 5 includes a following column 5a, a ball leg 5b provided at the tip of the following column 5a, and the like. The ball leg 5b is a ball-shaped leg in which a hard sphere such as metal is used as a core and an elastic member such as rubber is applied on the surface. The follow-up support 5 a is a bearing that rotatably fixes the ball leg 5 b and is fixed to the bottom surface of the main body 50.

The plurality of legs are installed on the bottom surface of the main body 50 so that the fixed leg 3 and the follower leg 5 are positioned at the respective vertices of the base of the isosceles triangle with the foot part 4 as the apex of the virtual isosceles triangle. Yes.
With such a configuration, the main body 50 rotates around the fixed leg 3 as the rotary leg 4b of the foot 4 is driven. The rotational movement is performed with a radius R as a line connecting the fixed leg 3 and the foot portion 4. Furthermore, the main body 50 tilts with the fixed leg 3 and the follower leg 5 as fulcrums in accordance with the expansion and contraction of the column 4a in the arrow T direction.
Since the projection unit 1 is installed on the main body 50 on the upper surface of the foot unit 4, the horizontal direction is 360 degrees along the rotation position and inclination of the main unit 50, and the maximum of the column 4 a of the foot unit 4 is vertical in the vertical direction. Projects an image within the range corresponding to the length of expansion / contraction. Hereinafter, moving the projection position of the image by adjusting the projection direction of the projection light in this way is referred to as “foot adjustment”. In the foot adjustment, the position of the projected image can be increased and moved quickly by the rotation of the rotating leg 4b and the expansion and contraction of the support column 4a.

Next, the internal configuration of the projector 100 will be described. FIG. 3 is a schematic configuration diagram of the projector 100.
The projector 100 separates light emitted from the lamp 10 as a light source into three primary color components of red light, blue light, and green light, and each color light that is a light modulation element included in the optical unit 17 for each color light. This is a so-called “liquid crystal three-plate projector” in which a liquid crystal light valve modulates in accordance with a video signal from a video signal supply device 7 such as a personal computer, synthesizes it again, and projects it onto a screen SC.
The projector 100 is operated by the operation unit 9 having a plurality of operation buttons (not shown) for operating the projector 100 provided on the upper surface of the main body unit 50, or a plurality of operations similar to the operation unit 9. Remote control is performed by a remote controller 8 having buttons.

The projector 100 includes a projection unit 1, a CCD 2, a fixed leg 3, a foot unit 4, a driven leg 5, a foot drive unit 6, an operation unit 9, a lamp 10, a power supply unit 11, a video signal processing unit 12, a video memory 13, and video correction. 14, pattern memory 15, liquid crystal panel drive unit 16, optical unit 17, lamp drive unit 18, projection lens adjustment unit 19, video analysis unit 20, operation receiving unit 21, control unit 22, storage unit 23, and the like. Yes.
The projection unit 1 includes a plurality of lenses (all not shown) including a projection lens for enlarging the modulated light, and a piezoelectric motor as an actuator for adjusting the magnification rate of the projection lens (hereinafter referred to as “zoom adjustment”). OZ, piezoelectric motor OF for adjusting the focus of the projected image (hereinafter referred to as “focus adjustment”), and piezoelectric as a lens shift unit for moving the position of the projection lens (hereinafter referred to as “lens shift”) Including motors SX and SY.

The CCD 2, the fixed leg 3, the foot part 4, the driven leg 5, and the operation part 9 have the configuration as described above.
The foot drive unit 6 transmits a drive signal for driving the servo motors FX and FY to the foot unit 4 according to a command for driving the foot unit 4 from the control unit 22 to drive the servo motors FX and FY.
The lamp 10 is a discharge-type lamp capable of obtaining high luminance such as a high-pressure mercury lamp, a metal halide lamp, and a halogen lamp.
The power supply unit 11 is stabilized by introducing AC power from the external power supply 24 from the plug and performing transformation, rectification, and smoothing in an internal AC / DC conversion unit (not shown). A DC voltage is supplied to each part of the projector 100.

The video signal processing unit 12 converts the video signal Vin from the analog signal to the digital signal so that the analog video signal Vin supplied from the video signal supply device 7 can perform various video signal processing described later. It includes a video converter (not shown) that performs A / D conversion processing or the like for converting to A.D.
The video signal processing unit 12 writes video data into the video memory 13 and reads it under a predetermined condition in order to make the video signal converted into a digital signal suitable for display on the liquid crystal light valve. Perform signal processing and output as digital video signal Dcs. The video signal processing includes scaling processing that matches the resolution of the liquid crystal light valve by enlarging and reducing the video represented by the video signal. In the scaling process, in order to correct the distortion of the projected image V shown in FIG. 1, the shape of the projected image is corrected so as to have the shape of the screen SC indicated by Q in FIG. "Trapezoidal distortion correction processing").

The video correction unit 14 converts the gradation value of the video signal Dcs into a digital video signal Dcs from the video signal processing unit 12 into a gradation value suitable for display on the liquid crystal light valve, Color unevenness correction processing caused by uneven brightness or the like inherent to the bulb is performed and output as a video signal Dout. Furthermore, the video correction unit 14 stores various test patterns required for automatic zoom and focus adjustment, a standby screen when no video signal is input, and the like according to commands from the control unit 22. In addition, it has a function of reading various test patterns and generating and outputting a video signal Dout.
The liquid crystal panel driving unit 16 supplies the liquid crystal light valve with the video signal Dout input from the video correction unit 14 and the driving voltage, and projects the video onto the liquid crystal light valve.

The optical unit 17 includes an integrator optical system that converts white light emitted from the lamp 10 into substantially parallel light having a stable luminance distribution, and red, green, and blue colors that are three primary colors of light. A separation optical system that separates light components and supplies them to a liquid crystal light valve for each color light, and a combination optical system that combines again each color light modulated according to the video signal Dout for each color light by the liquid crystal light valve ( Neither is shown). The optical unit 17 emits a full-color, substantially parallel modulated light synthesized by the synthesis optical system.
The lamp driving unit 18 is supplied with electric power from the power supply unit 11 and generates an igniter circuit that forms a discharge path by generating a high voltage for lighting the lamp 10 as a discharge lamp, and a stable lighting state after lighting. Is provided with a ballast circuit (none of which is shown).
The projection lens adjustment unit 19 drives the piezoelectric motors OZ and OF for “zoom adjustment” and “focus adjustment” and the piezoelectric motors SX and SY for “lens shift” of the projection unit 1 according to a command from the control unit 22. Drive signals are generated to drive each piezoelectric motor.

The video analysis unit 20 analyzes the luminance of the imaging data from the CCD 2 and detects whether the imaging data includes a screen or the position, size, shape, etc. of the screen when the screen is included. . The screen detection method will be described later.
When the operation receiving unit 21 is operated to the operation unit such as the remote controller 8, the operation receiving unit 21 receives the operation and sends an operation signal serving as a trigger for various operations to the control unit 22.
The control unit 22 is a CPU (Central Processing Unit), and exchanges signals with each unit via the bus line Bus. For example, when automatically detecting the screen, the control unit 17 sends an imaging command as an imaging command to the CCD 2 to cause the CCD 2 to perform imaging.

The storage unit 23 is configured by a nonvolatile memory capable of rewriting data, such as a flash memory, for example. In the storage unit 23, for example, a startup routine for starting the projector 100, a screen automatically detected, and the position and size of the projected image so that the projected image matches the detected screen are automatically detected. Various programs for controlling the operation of the projector 100, such as an “automatic image adjustment program” for adjusting the image data, and accompanying data are stored.
The accompanying data includes information necessary for adjusting the projection direction and magnification of the projection light so that the projected image substantially matches the position, size, and shape of the screen detected by the image analysis unit 20. And an adjustment table in which adjustment values as information necessary for correcting the shape of the video defined by the video signal are stored. The information necessary for adjusting the projection direction and magnification of the projection light and the information necessary for correcting the shape of the image may be, for example, arithmetic expressions for deriving the respective adjustment values. good.

<< Screen detection function and various adjustment functions >>
Next, main functions of the projector 100 will be described. The projector 100 has a screen detection function, a “zoom adjustment”, a “focus adjustment”, and a “lens shift” function.
First, the screen detection function will be described. FIG. 4 is a diagram showing the imaging range of the CCD 2 from the “projector viewpoint” and various aspects of the screen observed in the vicinity of the imaging range. The imaging range FA of the CCD 2 is provided so as to cover an image projection range by as many foot portions 4 as possible. Specifically, the opening length in the vertical direction of the imaging range FA is a length capable of capturing a projected image that moves according to the maximum extension / contraction length of the support column 4a of the foot portion 4. The opening length in the horizontal direction corresponds to, for example, the maximum detection length that can detect the luminance of the CCD 2. The lens shift range SA within the imaging range FA indicates a range in which the position of the projected image can be precisely adjusted by “lens shift”. The projected video V is included in the lens shift range SA.

Screens SC <b> 1 to SC <b> 6 show the aspect of the screen observed from the place where the projector 100 is installed from the viewpoint of the projector. In FIG. 4, it is assumed that the projector 100 is installed on the lower right side from the screen as shown in FIG.
In FIG. 4, for example, an all-white image is projected as the projected image V. In this state, it is assumed that the projector 100 is installed at a place where the screen viewed from the projector 100 is observed as the screen SC2. In this case, in the image data captured by the CCD 2, the screen SC2 should be observed in a state where a part of the shape is applied to the lower left side of the projected video V within the lens shift range SA. The video analysis unit 20 recognizes that the screen SC2 is in a state where a part of the shape is applied to the lower left side of the projection video V within the lens shift range SA by analyzing the captured data based on luminance.

  This is an application of the difference in color tone and reflectance between the screen and the wall surface on which the screen is installed. Since the screen uses a color tone and material such as white having a high reflectivity in order to display a clear image, the reflectivity differs from the wall surface. Therefore, by analyzing the luminance detected from the portion corresponding to the wall surface portion and the luminance detected from the portion corresponding to the screen in the imaging data, the screen SC2 is positioned as shown in FIG. 4 as the luminance distribution. Can be detected.

It is also possible to detect the screen without projecting an all-white image. This is a method of performing imaging by the CCD 2 in a state where projection of an image is stopped or an all black image with a gradation value of zero is projected. When the projection of the image is stopped, since the projection image V does not exist, the state of the wall surface and the screen reflecting the illumination in the environment of the imaging range FA is observed. Even when an all-black image is projected, the all-black image is low in brightness because the gradation value is zero, and is assimilated with the background such as a wall, and under the same environment illumination as when the image projection is stopped. It is possible to observe the state of the wall and the screen.
Even under ambient lighting, since the color tone and reflectance of the screen and the wall surface on which the screen is installed are different, the luminance analyzed from the imaging data is different. This makes it possible to detect the screen from the luminance distribution status. However, in order to detect a slight luminance difference between the wall surface and the screen under ambient illumination, it is necessary to increase the sensor sensitivity setting of the CCD 2.

  Next, the “zoom adjustment” and “focus adjustment” functions will be described with reference to FIG. When the screen is detected by the method described above, the “zoom adjustment” function drives the zoom adjustment piezoelectric motor OZ so that the size of the projected image matches the size of the detected screen. This is done by adjusting the magnification of the projection lens of the projection unit 1.

“Focus adjustment”, for example, as shown in Patent Document 2, projects a test pattern in which white and black lines are alternately arranged repeatedly, and changes the focal length of the test pattern. An image is picked up by the image pickup means, and a place where the contrast, which is the difference in luminance between the white portion and the black portion of the picked-up test pattern, is maximized is derived as the optimum focal length. Alternatively, a distance measuring unit (not shown) for emitting and receiving infrared rays may be provided, the infrared rays may be emitted, the distance may be measured by infrared rays reflected from the screen, and the measured distance may be focused. .
For example, the projector 100 drives the piezoelectric motor OF of the projection unit 1 by the projection lens adjustment unit 19 so that the portion where the projection optical axis L intersects the screen is focused before each imaging, for example, every time the CCD 2 performs the imaging. Automatically performs “focus adjustment” to focus the image projected on the screen. In addition, the timing for automatically performing “focus adjustment” may be performed every time projection image adjustment such as foot adjustment, zoom adjustment, and lens shift is performed.

  Next, the “lens shift” function will be described with reference to FIGS. The projector 100 can move the position of the projected image V within the lens shift range SA by lens shift. For example, when the detected screen is within the lens shift range SA like the screens SC1 and SC2, the position of the projected image V can be adjusted to the screen by lens shift. The lens shift is performed by moving the projection lens on the surface where the optical axis of the modulated light emitted from the optical unit 17 becomes a vertical line by piezoelectric motors SX and SY that can be finely driven.

  In FIG. 4, the position of the lens shift range SA is below the central portion of the imaging range FA because the column 4a of the foot portion 4 is in the shortest state. Using this state as a reference setting, the projector 100 adjusts the projected image to the detected screen position. The adjustment table of the storage unit 23 stores adjustment values for adjusting the foot according to the screen position observed from the reference setting. In the projector 100, for example, a screen that is observed outside the lens shift range SA and inside the imaging range FA, such as the screen SC4, falls within the lens shift range SA that allows precise projection image alignment. Next, adjust the foot. The foot adjustment is performed within a foot adjustable range indicated by an arrow U.

<Automatic image adjustment processing>
Next, FIGS. 5 and 4 show automatic image adjustment processing for automatically detecting the screen and automatically adjusting the projection position, size, and shape of the projected image so that the projected image matches the detected screen. The description will be made with reference to FIGS. 1 and 3 as appropriate. FIG. 5 is a flowchart showing the flow of the automatic video adjustment process.
Since the projector 100 is installed in an environment as shown in FIG. 1 and an operation for performing automatic video adjustment processing is performed by the remote controller 8, the “automatic video adjustment program” stored in the storage unit 23 is executed.

In step S <b> 1, the control unit 22 causes the video correction unit 14 to read out an all white test pattern from the pattern memory 15 and causes the projection unit 1 to project an all white image. At this time, the “zoom adjustment” of the projection lens of the projection unit 1 is set to the maximum zoom by the servo motor OZ.
In step S <b> 2, the control unit 22 images a range including an all white image projected by the CCD 2. Prior to imaging, the all-white video is automatically focused.

  In step S <b> 3, the control unit 22 analyzes whether the screen is included in the range of the all-white projection video V of the data captured by the CCD 2 by the video analysis unit 20 based on the luminance. In the analyzed imaging data, the screen can be detected when the screen is within the range of the projected video V in FIG. For example, when the screen is not in the range of the all-white projected image V as in the screens SC4, SC5, SC6, the screen cannot be detected, and the process proceeds to step S15. Here, as in the screens SC1, SC2, and SC3, the screen falls within the range of the projected image V of all white or is included, so the process proceeds to step S4.

In step S4, the control unit 22 determines whether or not the detected entire screen is within the lens shift adjustment range SA. When the entire picture of the screen is not within the lens shift adjustment range SA as in the screen SC3 of FIG. 4, since the adjustment range by the lens shift is exceeded, the process proceeds to step S11. Note that whether or not the entire screen is within the lens shift adjustment range SA is, for example, that the detected screen does not cover the outer shape of the lens shift adjustment range SA in FIG. If so, it is determined that it is within the lens shift adjustment range SA. Here, since the screen is within the lens shift adjustment range SA like the screen SC1, the process proceeds to step S5.
In step S5, the control unit 22 adjusts the lens shift, zoom, and trapezoidal distortion correction values for adjusting the projected image to the detected position, size, and shape of the screen, and the adjustment values in the storage unit 23. Assign from the table.

In step S6, the control unit 22 causes the projection lens adjustment unit 19 to drive the lens shifting piezoelectric motors SX and SY of the projection unit 1 along the adjustment value, and precisely adjusts the position of the projected image to the detected screen position. To match.
In step S7, the control unit 22 causes the projection lens adjustment unit 19 to drive the zoom adjustment piezoelectric motor OZ of the projection unit 1 along the adjustment value, and adjusts the size of the projected image to the detected screen size. .
In step S8, the control unit 22 causes the video signal processing unit 12 to perform a trapezoidal distortion correction process on the video signal along the adjustment value so as to match the shape of the projected video with the detected screen shape. As described above, since the shape of the projected image V at the “projector line of sight” is always a rectangle of the liquid crystal light valve, the difference shape portion from the rectangle that is generated due to the trapezoidal distortion correction processing becomes the all black. Is projected.
In step S9, the control unit 22 causes the CCD 2 to capture the all white image adjusted in the projected steps S6 to S8. Prior to imaging, the all-white video is automatically focused.

  In step S10, the control unit 22 causes the video analysis unit 20 to analyze the data captured by the CCD 2, and determines whether the position, size, and shape of the projected video match the screen. If they do not match, the process returns to step S5, and the projected image is adjusted again. Here, since the adjusted projected image matches the screen, the automatic image adjustment process is terminated.

Next, a case will be described where the entire screen detected in step S4 is not within the lens shift adjustment range SA like the screen SC3.
In step S <b> 11, the control unit 22 assigns an adjustment value of foot adjustment for keeping the detected screen within the lens shift adjustment range SA from the adjustment table of the storage unit 23.
In step S12, the control unit 22 drives the servo motors FX and FY as power sources of the support column 4a and the movable leg 4b of the foot unit 4 to bring the position of the projected image closer to the detected screen position.

In step S13, the control unit 22 causes the CCD 2 to capture the all-white image adjusted in the projected step S12. Prior to imaging, the all-white video is automatically focused.
In step S14, the control unit 22 causes the video analysis unit 20 to analyze the data captured by the CCD 2, and determines whether the entire screen is within the lens shift adjustment range SA. If not, the process returns to step S11 to adjust the projected image again. When the entire screen is within the lens shift adjustment range SA, the process proceeds to step S5, and precise adjustment of the projected image by lens shift is performed.

Subsequently, a case where the screen is not detected in step S3 as in the screens SC4, SC5, and SC6 will be described.
In step S <b> 15, the control unit 22 causes the video correction unit 14 to read out an all-black test pattern from the pattern memory 15 and causes the projection unit 1 to project an all-black image. The all-black image is an image with a gradation value of zero, so the luminance is low and it is assimilated with the background such as the wall.
In step S16, the control unit 22 causes the CCD 2 with increased detection sensitivity to image the imaging range FA.
In step S17, the control unit 22 causes the video analysis unit 20 to analyze the data captured by the CCD 2, and determines whether a screen is included within the imaging range FA.
The analyzed imaging data becomes an image within the imaging range FA of FIG. When the screen is not in the imaging range FA as in the screen SC6, since the screen cannot be detected, the “automatic image adjustment program” is terminated. Here, as in the screens SC4 and SC5, since the screen is within or included in the imaging range FA, the process proceeds to step S18.

In step S18, the control unit 22 determines whether the entire screen is within the imaging range FA based on the imaging data analyzed by the video analysis unit 20. For example, when the entire screen is not within the imaging range FA as in the screen SC5, it is out of the adjustment range of the projected image, so the “automatic image adjustment program” is terminated. Here, for example, the entire picture of the screen is within the imaging range FA like the screen SC4, and thus the process proceeds to step S19.
In step S <b> 19, the control unit 22 assigns an adjustment value for foot adjustment for keeping the detected screen within the lens shift adjustment range SA from the adjustment table of the storage unit 23.
In step S20, the control unit 22 drives the servo motors FX and FY of the foot unit 4 along the adjustment value to bring the position of the projected image closer to the detected screen position.

In step S <b> 21, the control unit 22 causes the video correction unit 14 to read out an all white test pattern from the pattern memory 15 and causes the projection unit 1 to project an all white image.
In step S <b> 22, the control unit 22 captures an all white image projected by the CCD 2. Prior to imaging, the all-white video is automatically focused.
In step S23, the control unit 22 causes the video analysis unit 20 to analyze data captured by the CCD 2, and determines whether the entire screen is within the lens shift adjustment range SA. If not, the process returns to step S19 to adjust the projected image again. When the entire screen is within the lens shift adjustment range SA, the process proceeds to step S5, and precise adjustment of the projected image by lens shift is performed.

FIG. 6 is a diagram showing an aspect when the projected image is matched with the detected screen by the above-described “automatic image adjustment program”. From the screen viewpoint, the image portion E of the projected image V matches the position, size and shape of the screen SC as shown in FIG. An all-black image B is projected on the difference shape portion between the projected image V and the image portion E. Further, the projection optical axis L of the projection light substantially coincides with the center point P of the screen SC.
When this state is viewed from the projector viewpoint Q, the all-black image B is not assimilated with the wall surface, and a state in which the position, size, and shape of the image portion E substantially match the screen SC is observed. . In the above-described “automatic image adjustment program”, the projector 100 has been described on the assumption that it is installed at the lower right side from the screen as shown in FIG. 1. However, where the projector 100 is installed. Works similarly.

As described above, according to the present embodiment, the following effects can be obtained.
(1) The projection unit 1 is a direction in which the main body 50 is inclined according to the protruding length of the support column 4a from the main body 50 at the position where the main body 50 is rotated about the fixed leg 3 by the rotating leg 4b of the foot 4 Therefore, the projector 100 projects the image within a range corresponding to the allowable extension / contraction length of the support column 4a of the foot portion 4 in the horizontal direction and 360 degrees in the horizontal direction.
Therefore, the projector 100 has a wide projection range in which an image can be projected, and can project an image to a desired place by setting the foot unit 4 from a wide projection range.
Therefore, it is possible to provide a projector 100 that has a wide projection range in which an image can be projected and can project an image to a desired place within the projection range.

(2) The control unit 22 causes the CCD 2 to capture a range including the projected video V, causes the video analysis unit 20 to analyze the captured data, and projects and expands the projection light according to the detected position and size of the screen. The adjustment values of the foot adjustment, the zoom adjustment, and the lens shift for adjusting the rate are assigned from the adjustment table of the storage unit 23, and the servo motors FX and FY of the foot unit 4 and the piezoelectric of the projection unit 1 according to the assigned adjustment values. Since the motors OZ, SX, and SY are driven, the projector 100 automatically detects the position and size of the screen, and automatically adjusts so that the projected image substantially matches the detected screen.
Accordingly, it is possible to provide a projector 100 that has a wide projection range, automatically detects a screen installed within the projection range, and automatically adjusts a projected image so as to substantially match the detected screen.

(3) The control unit 22 assigns an adjustment value for correcting the shape of the image defined by the image signal corresponding to the shape of the screen detected by the image analysis unit 20 from the adjustment table of the storage unit 23 and assigns it. In accordance with the adjustment value, the video signal processing unit 12 performs a trapezoidal distortion correction process on the video signal. Therefore, the projector 100 automatically detects the shape of the screen, and the projected image substantially matches the detected screen shape. To adjust automatically.
Accordingly, it is possible to provide a projector 100 that has a wide projection range, automatically detects a screen installed within the projection range, and automatically adjusts a projected image so as to substantially match the detected screen.

(4) When the screen is detected by the video analysis unit 20, the control unit 22 drives the servo motors FX and FY of the foot unit 4 so that the entire screen of the detected screen is within the lens shift range SA. The detected screen can be quickly accommodated within the lens shift range SA with a large movement.
Furthermore, when the entire screen is within the lens shift range SA, the control unit 22 causes the lens shift piezoelectric motor of the projection unit 1 to substantially match the detected position and size of the screen. The piezoelectric motor OZ for SX, SY and zoom adjustment is finely driven.
Therefore, the detected screen can be quickly stored in the lens shift range SA by the foot portion 4, and the position of the projected image can be accurately adjusted by the lens shift.
Accordingly, it is possible to provide a projector 100 that has a wide projection range, automatically detects a screen installed within the projection range, and automatically adjusts a projected image quickly and precisely so as to match the detected screen.

(5) Since the imaging range FA of the CCD 2 is provided so as to cover the image projection range including as many foot portions 4 as possible including the lens shift range SA, the range in which the screen can be detected is wide. In addition, since the imaging range FA is also a corresponding range for automatic video adjustment processing, the projector 100 has a wide corresponding range for automatic video adjustment processing.
Therefore, the user of the projector 100 does not need to install the projector 100 with high accuracy, it is only necessary to place the projector 100 with the screen facing properly, and the projector 100 automatically detects the screen and uses the detected screen. Project matching images.
Accordingly, it is possible to provide the projector 100 having a wide range in which the screen can be automatically detected and a corresponding range of the automatic image adjustment processing.

(6) Since the projector 100 automatically performs “focus adjustment” prior to imaging every time the CCD 2 performs imaging, the contrast of the projected image increases.
Therefore, since the image data captured by the CCD 2 also has a high contrast, it is possible to accurately grasp the position and shape of the screen based on the luminance.
Therefore, it is possible to provide the projector 100 that can accurately detect the position and shape of the screen.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below.

(Modification 1)
In the above embodiment, the precise position adjustment of the projected image has been described as being performed by lens shift, but the present invention is not limited to this. For example, it is good also as adjusting the position of a projection image only by the foot adjustment by the foot part 4, without having the structure for performing a lens shift. In the case of this configuration, it is possible to obtain the same effect as in the above embodiment by precisely driving the foot adjustment.

(Modification 2)
This will be described with reference to FIG. In the embodiment and the modification, the support column 4a and the rotating leg 4b of the foot portion 4 have been described as a metal support column and a caterpillar-shaped rotating member each provided with a rack, but are not limited thereto. For example, the column 4a may be a column or a column provided with an expansion / contraction mechanism using a screw. The rotating leg may be a rubber tire.
Even with such a configuration, since the foot adjustment can be performed in the same manner as in the above embodiment, the same effect as in the above embodiment can be obtained.

(Modification 3)
This will be described with reference to FIG. In the embodiment and the modification, when the screen cannot be detected because the screen is outside the adjustment range of the projected image, such as the screens SC5 and SC6, the fact that the screen cannot be detected may be notified by display or voice. For example, the video correction unit 14 superimposes the text “The screen cannot be detected. Please change the installation location of the projector.” On the video signal and displays the OSD (On Screen Display) on the projected video. The characters for OSD display are stored in the pattern memory 15.
Alternatively, an audio unit that generates an audio signal and a speaker may be provided, and an audio notification may be given such as "Screen cannot be detected. Change the projector installation location."
According to this configuration, it is possible to provide a projector capable of notifying the user that the screen is undetectable with visual or auditory sense.

(Modification 4)
In the embodiment and the modification, the projector 100 has been described as a liquid crystal three-plate type projection projector using three liquid crystal light valves as light modulation elements, but is not limited thereto. For example, a light modulation element of a projector uses a single-plate liquid crystal light valve having liquid crystal cells of the same number as the resolution for each color light, in which red, blue, and green color filters are regularly arranged in a grid pattern. May be. Further, a configuration using a reflective liquid crystal display device or a tilt mirror device may be used. Even if it is these structures, the effect similar to the said embodiment and each modification can be acquired.

FIG. 5 is a schematic diagram of use of the projector according to an embodiment. FIG. 1 is a schematic configuration diagram of a projector. The figure which shows the imaging range of CCD. The flowchart of an automatic image adjustment process. The figure which shows the one aspect | mode of the image | video adjusted by the automatic image | video adjustment process.

Explanation of symbols

Projection unit including a projection lens ... 1, CCD as an imaging unit ... 2, fixed leg as a leg ... 3, foot part as a movable leg ... 4, support post ... 4a, rotating leg ... 4b, follower leg as a leg ... 5 , Foot drive unit 6, lamp as light source unit 10, video signal processing unit 12, video correction unit 14, optical unit including light modulation element 17, projection lens adjustment unit 19, video analysis unit 20 , Control unit 22, storage unit for storing the adjustment table 23, servo motor as an actuator for extending and contracting the support column, FY, servo motor as an actuator for rotating the rotating leg FX, an actuator for adjusting the magnification of the projection lens Piezoelectric motor as OZ, Piezoelectric motor as lens shift unit SX, SY, Screen ... SC, Wall surface ... H, Projected image ... V, Lens shift range ... SA, Imaging range FA.

Claims (7)

A projector that is supported by a plurality of legs including at least one movable leg and projects an image on a screen,
A light source unit for supplying light;
An optical unit including a light modulation element that converts light from the light source unit into modulated light modulated in accordance with a video signal that defines a video;
A projection unit that expands the modulated light emitted from the optical unit and generates projection light representing a projection image projected on the screen;
A main body that is the main body of the projector including at least the projection unit;
A fixed leg that supports the main body and serves as a fulcrum when the main body rotates in a horizontal direction;
A rotating leg that is provided below the projection unit and rotates the main body part in a substantially horizontal direction around the fixed leg, and connects the rotating leg and the main body part, and a protruding length from the main body part And a supporting column that tilts the main body with the fixed leg as a fulcrum to move the position of the projected image by the projection light from the projection unit in a substantially vertical direction, and the foot as the movable leg. The projection unit is configured to display an image along a direction inclined according to the protruding length of the support column of the foot unit at a position where the main body unit is rotated about the fixed leg by a rotating leg of the foot unit. A projector characterized by projecting. The foot portion further includes an actuator for adjusting the protruding length of the support column and an actuator for rotating the rotating leg,
The projection unit includes at least a projection lens for enlarging the projection light, and an actuator for adjusting an enlargement ratio of the projection lens,
The main body includes an imaging unit provided so as to be able to capture a range including the entire image of the projected video, a video analysis unit that detects at least the position and size of the screen from imaging data captured by the imaging unit,
A storage unit that stores information necessary for adjusting a projection direction and an enlargement ratio of projection light so that the projection image substantially matches the position and size of the screen detected by the image analysis unit;
A control unit that instructs at least the imaging unit to perform the imaging,
The control unit causes the video analysis unit to analyze the imaging data captured by the imaging unit, and adjusts the projection direction and the enlargement ratio of the projection light according to the detected position and size of the screen. The adjustment value is obtained from the information read from the storage unit, and the plurality of actuators of the foot unit and the actuator for adjusting the magnification ratio of the projection lens are driven according to the obtained adjustment value. Projector. The main body further includes a video signal processing unit that performs a process of correcting a video shape on the video signal,
The video analysis unit further detects the shape of the screen from the imaging data captured by the imaging unit,
The adjustment table of the storage unit is information necessary for correcting the shape of the image defined by the image signal so that the shape of the projected image substantially matches the shape of the screen detected by the image analysis unit. Remember
The control unit causes the video analysis unit to analyze the imaging data captured by the imaging unit, and sets an adjustment value for correcting a video shape defined by a video signal corresponding to the detected screen shape. 3. The method according to claim 1, wherein the video signal processing unit performs a process of correcting the shape of the video on the video signal based on the obtained adjustment value obtained from the information read from the storage unit. The projector described. The projection unit precisely positions the projection image by moving the projection lens on a surface where the optical axis of the modulated light is perpendicular by an actuator and a projection lens for enlarging the modulated light. It has a lens shift part to adjust,
The foot portion further includes an actuator for expanding and contracting the support column and an actuator for rotating the rotating leg,
The main body has an imaging viewpoint that is parallel to the optical axis of the central portion of the projection light, and is provided so as to be able to capture a range larger than the adjustment range of the position of the projection image by the lens shift unit And
A video analysis unit for detecting that at least the screen is included in the imaging data captured by the imaging unit;
A control unit that instructs at least the imaging unit to perform the imaging,
When the screen is detected by the video analysis unit, the control unit drives the plurality of actuators of the foot unit so that the entire screen of the detected screen is within the adjustment range by the lens shift unit. The projector according to claim 1. The projection unit further includes an actuator for adjusting an enlargement ratio of the projection lens,
The video analysis unit further detects the position and size of the screen from the imaging data,
When the entire screen detected by the video analysis unit is within the adjustment range by the lens shift unit, the control unit substantially matches the detected position and size of the screen with the projected image. The projector according to claim 4, wherein the position and size of the projected image are adjusted by an actuator that adjusts an enlargement ratio of the lens shift unit and the projection lens. The main body further includes a video signal processing unit that performs a process of correcting a video shape on the video signal,
The video analysis unit further detects the shape of the screen from the imaging data captured by the imaging unit,
When the entire picture of the screen detected by the video analysis unit is within the adjustment range by the lens shift unit, the control unit determines that the shape of the projection video is in the shape of the screen detected by the video analysis unit. The projector according to claim 4, wherein the video signal processing unit is caused to perform a process of correcting a video shape of the video signal so as to substantially match. A foot part that rotates the projector body in the horizontal direction and tilts the projector body to move the position of the projected image in the horizontal direction and the vertical direction;
An adjustment unit for adjusting a projected image of a projector comprising: an imaging unit provided so as to be able to capture a range larger than the projected image including a screen for projecting an image;
Capturing a larger range than the projected image including the screen by the imaging unit;
Detecting the position and size of the screen from the captured image data;
Adjusting the position and size of the projected image by the foot so that the projected image substantially matches the detected position and size of the screen. Adjustment method.

Images