JP2006313979A - Projector, and method for controlling projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of automatically positioning a projection image within the projection surface of a screen. <P>SOLUTION: A projection position control section 76 constituting the projector 1 includes a luminance value calculation section 762 which calculates respective luminance values at a plurality of predetermined positions within a projection object area based upon an image picked up by an imaging section 6, an outer edge information generation section 763 which generates outer edge information by recognizing one of at least a portion of the outer edge of the projection surface of the screen Sc and at least a portion of the outer edge of the projection image within the projection luminance value based upon the respective luminance values, a movement decision section 764 which decides a movement direction of the projection image based upon the outer edge information, and a driving control section 765 which drives and controls a projection position adjusting device 44 to move the projection image in the decided movement direction and thus position the projection image within the projection surface of the screen Sc. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector and a projector control method.

Conventionally, it is known to use a projector for presentations at conferences, academic conferences, exhibitions, and the like. This projector modulates a light beam emitted from a light source according to image information, further synthesizes it, enlarges and projects it with a projection optical device, and projects it onto a screen.
In such a projector, there is a case where the projector is fixed at a low position and projected upward, or a projector is fixed at a high position and projected downward. For this reason, an optical system such as a light modulator is provided with a projection position adjusting device that moves the projection optical device in a direction orthogonal to the direction in which the light beam is emitted (for example, Patent Documents). 1).
In the projection position adjusting device described in Patent Document 1, the projection optical device is supported by the lens holder, and the lens holder is pressed against the second fixed side plate by the urging means provided on the back surface of the first fixed side plate. The pressing force is set so that the lens holder can be held and moved. Then, the user rotates the first dial or the second dial while observing the enlarged projected image on the screen, and projects the projected image so that the projected image is positioned at a predetermined position on the screen. Adjust the position.
JP 2004-85910 A

However, in the projector described in Patent Document 1, once the installation position of the projector is changed with respect to the screen, the position of the projected image on the screen also shifts. It will stick out of the projection surface. In such a case, the user again rotates the first dial or the second dial while observing the projection image enlarged and projected on the screen, so that the projection image is positioned within the projection plane of the screen. The projection position of the projection image is adjusted so that For this reason, it is necessary for the user to perform complicated work in accordance with the change in the installation position of the projector, and convenience cannot be improved.
Therefore, there is a demand for a technique that can automatically position a projection image within a projection surface of a screen.

  An object of the present invention is to provide a projector capable of automatically positioning a projection image within a projection surface of a screen, and a projector control method.

The projector of the present invention includes a light modulation device that modulates a light beam emitted from a light source, a display control device that controls the light modulation device, and an enlarged projection of the light beam modulated by the light modulation device on the screen. A projection optical device that generates a projection image on the projection, and a projection that enables the projection optical device to be movable in a plane orthogonal to the projection direction of the projection optical device and to adjust the position of the projection image on the screen A projector including a position adjustment device, wherein a setting input unit for setting and inputting position adjustment information for positioning the projection image within the projection plane of the screen, and imaging a projection target area including the projection plane of the screen And the projection position adjustment device is driven based on the projection image position adjustment information to position the projection image within the projection surface of the screen. A projection position adjustment device that performs projection position adjustment control, wherein the projection position control device is configured to calculate each luminance value at a plurality of predetermined positions in the projection target region based on an image captured by the imaging device. A luminance value calculation unit for calculating the image, and at least a part of an outer edge part of the projection surface of the screen and at least a part of the outer edge part of the projection image in the projection target area based on the luminance values. An outer edge information generating unit that recognizes at least one and generates outer edge information, a movement determining unit that determines a moving direction of the projection image based on the outer edge information, and driving and controlling the projection position adjusting device, A drive control unit configured to move the projection image in the determined movement direction and position the projection image within a projection plane of the screen.
Here, the projection position adjusting device may be configured to support the projection optical device so as to be movable in a plane orthogonal to the projection direction. For example, both the vertical direction (vertical direction) and the horizontal direction (horizontal direction) The projection optical device may be moved in the above-described manner, or the projection optical device may be moved only in the vertical direction or the left-right direction.

In the present invention, since the projector includes the setting input unit, the imaging device, and the projection position control device, the projection image can be automatically positioned within the projection plane of the screen as follows.
First, when position adjustment information for positioning a projection image within the projection plane of the screen is set and input by the user to the setting input unit, the imaging device captures an image of a projection target area including the projection plane of the screen.
Thereafter, the projection position control device drives and controls the projection position adjustment device based on the image captured by the imaging device, and positions the projection image within the projection plane of the screen as described below.
That is, first, the luminance value calculation unit calculates each luminance value at a predetermined plurality of positions in the projection target area based on the image captured by the imaging device.
Next, the outer edge information generation unit recognizes at least one of at least a part of the outer edge part on the projection surface of the screen and at least a part of the outer edge part in the projection image based on the calculated luminance values. . The outer edge information generation unit generates outer edge information related to the recognized outer edge.
Next, based on the generated outer edge information, the movement determination unit, for example, based on the shape of the outer edge portion on the recognized projection surface of the screen or the shape of the outer edge portion in the recognized projection image, Determine the direction of movement.
The drive control unit drives and controls the projection position adjusting device, moves the projection image in the determined movement direction, and positions the projection image in the projection plane of the screen.

  As described above, the projection image can be automatically positioned within the projection surface of the screen. For example, once the installation position of the projector is changed with respect to the screen, a part of the projection image is outside the projection surface of the screen. Even if it protrudes, the user can set the position adjustment information to the setting input unit, and automatically position the projected image that partially protrudes outside the projection surface again within the projection surface of the screen. Can do. For this reason, unlike the prior art, there is no need for the user to perform the complicated work of rotating the first dial and the second dial again, and the convenience of the projector can be improved.

The projector according to the present invention includes a posture changing unit that is configured to be movable forward and backward inside and outside the projector, has a tip portion grounded to the outside, and changes the posture of the projector by changing the posture of the projector by moving forward and backward. The drive control unit preferably drives and controls the projection position adjusting device and the attitude changing unit when performing the projection position adjustment control.
In the present invention, the drive control unit drives and controls both the projection position adjusting device and the posture changing unit when positioning the projection image within the projection surface of the screen. Thus, when performing the projection position adjustment control, for example, only the projection position adjustment device is driven and controlled, and the movement limit of the projection optical device is mechanically restricted (moving the projection optical device further). If the projected image is not positioned within the projection plane of the screen even after reaching the position where it is impossible, the position changer is driven to move the position of the projected image within the projection plane of the screen. A projected image can be positioned. For this reason, by driving both the projection position adjusting device and the attitude changing unit, the movement range of the projection image can be expanded, the projection image can be positioned well within the projection plane of the screen, and the convenience of the projector is further increased. Can be improved.

In the projector according to the aspect of the invention, the projector includes an advance / retreat position detection unit that detects an advance / retreat position of the posture change unit, and the display control device inputs image information based on the advance / retreat position detected by the advance / retreat position detection unit. Based on the trapezoidal distortion correction unit for correcting the trapezoidal distortion of the projection image generated when tilting projection is performed by the projector, and the image information on which the trapezoidal distortion correction process has been performed. And a light modulation device driving unit for controlling the light modulation device.
In the present invention, when the projection position control is performed by the projection position control device and the attitude changing unit is driven and controlled, the advance / retreat position detecting unit detects the advance / retreat position of the attitude changing unit. Then, the trapezoidal distortion correction unit of the display control device performs trapezoidal distortion correction processing on the image information based on the detected advance / retreat position. Thereafter, the light modulation device driving unit of the display control device modulates the light beam emitted from the light source to the light modulation device based on the image information subjected to the trapezoidal distortion correction process. As a result, it is possible to automatically correct the trapezoidal distortion generated in the projected image by driving the attitude changing unit and changing the attitude of the projector, and distort the projected image positioned in the projection plane of the screen by the projection position adjustment control. It is possible to obtain a good projected image with no image.

In the projector according to the aspect of the invention, the outer edge information generation unit may define at least one of the outer edge portions on the projection surface of the screen as a boundary where the difference in luminance value between adjacent positions in the predetermined plurality of positions is equal to or greater than a first threshold value. A boundary at which a difference between luminance values at adjacent positions in the predetermined plurality of positions is equal to or greater than a second threshold and less than the first threshold is defined as at least a part of an outer edge in the projection image It is preferable to recognize.
According to the present invention, the outer edge information generation unit simply compares the difference between the luminance values of adjacent positions with the first threshold value or the second threshold value, and at least a part of the outer edge portion on the projection surface of the screen, And / or at least one of the outer edge portions in the projection image can be recognized. For this reason, an outer edge part can be recognized rapidly with a simple structure, and projection position adjustment control can be implemented more rapidly.

In the projector according to the aspect of the invention, the movement determination unit may have at least one of a shape of at least a part of the outer edge part on the projection surface of the screen and at least a part of the outer edge part in the projection image based on the outer edge information. It is preferable that the movement direction of the projection image is determined based on the recognized shape.
In the present invention, for example, the projection surface of the screen and the projection image are configured in a rectangular shape. For example, when the movement determination unit recognizes at least a part of the outer edge portion of the projection surface of the screen as a substantially U-shape, the movement determination unit determines the direction toward the U-shaped opening as the movement direction of the projection image. To do. In addition, for example, when the movement determination unit recognizes at least a part of the outer edge portion of the projection surface of the screen as a substantially L shape, the movement determination unit determines the direction toward the L-shaped opening as the movement direction of the projection image. To do. Further, for example, when the movement determination unit recognizes at least a part of the outer edge of the projection image as a substantially U shape, the direction toward the opposite side of the U-shaped opening is set as the movement direction of the projection image. judge. Furthermore, for example, when the movement determination unit recognizes at least a part of the outer edge of the projection image as a substantially L-shape, the movement direction of the projection image is set to the direction toward the opposite side of the L-shaped opening. Judge as. Accordingly, the projection image can be positioned in the projection plane of the screen by driving the projection position adjusting device and the posture changing unit to move the projection image in the determined movement direction. Therefore, the determination of the moving direction can be performed with high accuracy, and the projected image can be positioned better in the projection plane of the screen.

In the projector according to the aspect of the invention, the movement determination unit may generate the outer edge information when the outer edge information generation unit recognizes the entire outer edge portion of the projection surface of the screen and the entire outer edge portion of the projection image. Based on outer edge information, the center position of the projection surface and the center position of the projection image are recognized, and the projection image for positioning the projection image at a predetermined position on the projection surface based on the recognized center position. When determining the movement direction, the drive control unit moves the projection image in the determined movement direction and positions the projection image at a predetermined position on the projection surface of the screen when performing the projection position adjustment control. Is preferred.
In the present invention, the movement determination unit, when the outer edge information generation unit recognizes the entire outer edge portion of the projection surface and the projection image of the screen and generates outer edge information, generates the projection surface and the projection image based on the outer edge information. Recognize each center position. Then, the movement determination unit determines the movement direction of the projection image for positioning the projection image at a predetermined position on the projection surface based on each recognized center position. Accordingly, the projection position adjusting device and the posture changing unit are driven and controlled, and the projection image is moved in the moving direction, so that the projection image can be positioned not only in the projection plane of the screen but also at a predetermined position on the projection plane. Thus, the convenience of the projector can be further improved.

In the projector according to the aspect of the invention, when the drive control unit performs the projection position adjustment control, the outer edge information generation unit includes at least a part of the outer edge portion on the projection surface of the screen and at least an outer edge portion in the projection image. When the outer edge information cannot be generated without recognizing at least one of the parts, it is preferable that the position of the projection image is moved until the outer edge information generation unit generates the outer edge information.
According to the present invention, when the outer edge information generation unit cannot generate the outer edge information, that is, when a part of the projection image is not projected on the projection surface of the screen, the drive control unit The position of the projection image is moved until information is generated, that is, until a part of the projection image is projected on the projection surface of the screen. As a result, even when a part of the projection image is not projected on the projection surface of the screen, the projection image can be positioned within the projection surface of the screen by the projection position adjustment control. Further improvement can be achieved.

In the projector according to the aspect of the invention, the projection optical device includes a projection lens that enlarges and projects the light beam modulated by the light modulation device onto the screen, and the projection lens that performs zoom adjustment of the projection image that is enlarged and projected onto the screen. A zoom state change unit that changes the zoom state, and a zoom adjustment control device that performs zoom adjustment control to drive the zoom state change unit to change the zoom state, and the zoom adjustment control device includes: It is preferable that the zoom state changing unit is driven and controlled based on the position adjustment information to change the zoom state in a direction in which the outline of the projection image is enlarged.
In the present invention, when the position adjustment information is set and input to the setting input unit by the user, the zoom adjustment control device drives and controls the zoom state changing unit so that the projection lens is enlarged in the direction in which the contour of the projection image is enlarged. Change the zoom state. As a result, the projection position adjustment control can be performed in a state in which the outline of the projection image is enlarged, that is, a part of the projection image is easily projected on the projection surface of the screen by enlarging the outline of the projection image. The information generation unit can easily recognize at least a part of the outer edge part on the projection surface of the screen and / or at least a part of the outer edge part in the projection image. Accordingly, the outer edge information generation unit can generate the outer edge information more reliably, and the projection image can be more reliably positioned within the projection surface of the screen.

In the projector according to the aspect of the invention, the movement position detection unit that detects the movement position of the projection optical device by the projection position adjustment device and the movement position detection unit after the projection position adjustment control by the projection position control device. A movement position information storage unit that stores movement position information relating to the movement position of the projection optical device, and the setting input unit can set and input reposition adjustment information for positioning the projection image at a previous position. Preferably, the drive control unit is configured to drive the projection position adjustment device based on the reposition adjustment information and move the projection optical device to a movement position based on the movement position information.
In the present invention, the drive control unit reads out the movement position information from the movement position information storage unit when the re-position adjustment information for positioning the projection image at the previous position is input by the user to the setting input unit, and the projection is performed. The position adjustment device is driven and controlled, and the projection optical device is moved to a movement position based on the movement position information (a movement position of the projection optical device positioned by the previous projection position adjustment control). For this reason, for example, there are the following effects.
For example, in order to project a projection image onto a first screen installed at a predetermined position, the projector is installed in a ceiling-mounted state (a state where the top and bottom surfaces of the projector are reversed). Then, a second screen (whiteboard or the like) that is different from the first screen is installed at a position different from the first screen, and the projection position adjustment control is performed by the projector. Project a projected image. Thereafter, when projecting the projection image on the first screen again, the user inputs the re-position adjustment information to the setting input unit so that the projection optical apparatus has previously used the first screen. Is moved to the adjusted movement position, and the projection image is projected from the projector onto the first screen. Therefore, it is possible to reduce the load applied to the projection position control device of the projector without causing the projector to perform the projection position adjustment control again, and to promptly project the projection image on the first screen more quickly. Can be implemented.

The projector control method of the present invention includes a light modulation device that modulates a light beam emitted from a light source, a display control device that controls the light modulation device, and an enlarged projection of the light beam modulated by the light modulation device on a screen. A projection optical device that generates a projection image on the screen, and the projection optical device is movably supported within a plane orthogonal to the projection direction of the projection optical device, and the position of the projection image on the screen can be adjusted. A projection position adjusting device, and an imaging step of imaging a projection target area including a projection surface of the screen, and a predetermined in the projection target area based on the captured image A luminance value calculating step for calculating each luminance value at a plurality of positions on the projection surface of the screen in the projection target area based on each luminance value. An outer edge information generation step for generating at least one of an outer edge and at least one of the outer edges in the projection image to generate outer edge information, and movement of the projection image based on the outer edge information A movement determination step for determining a direction; and a drive control step for driving and controlling the projection position adjusting device, moving the projection image in the determined movement direction, and positioning the projection image within the projection plane of the screen. It is characterized by.
According to the present invention, the projector control method includes the imaging step, the luminance value calculation step, the outer edge information generation step, the movement determination step, and the drive control step.・ We can enjoy effect.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Configuration of projector]
FIG. 1 is a block diagram showing a schematic configuration of a projector 1 in the first embodiment.
The projector 1 modulates a light beam emitted from a light source according to image information to form an optical image, and enlarges and projects the formed optical image on a screen Sc (FIG. 1). As shown in FIG. 1, the projector 1 includes an operation unit 2 as a setting input unit, a power supply unit 3, an image forming unit 4, an attitude changing unit 5, an imaging unit 6, a control device 7, a lens. The position detector 8 and the advance / retreat position detector 9 are roughly configured.

The operation unit 2 includes a remote controller (not shown) and buttons and keys provided in the projector 1. The operation unit 2 recognizes an operation by the user and outputs a predetermined operation signal to the control device 7. As illustrated in FIG. 1, the operation unit 2 includes a position adjustment information input unit 21 and the like. In FIG. 1, an input unit that performs ON / OFF of the projector 1 in the operation unit 2, an input unit that performs volume adjustment, an input unit that performs image quality adjustment of the projection image, and an input that performs focus adjustment of the projection image The other input units such as the input unit and the input unit that performs zoom adjustment of the projection image are not shown.
The position adjustment information input unit 21 is an input button for positioning the projection image at a predetermined position on the projection surface of the screen Sc. Then, the position adjustment information input unit 21 recognizes the pressing by the user and outputs a predetermined operation signal as position adjustment information to the control device 7.
The power supply unit 3 supplies power supplied from the outside to each unit of the projector 1. Although not shown in the figure, the power source unit 3 is in a main power source that supplies power supplied from the outside to each unit of the projector 1 and a state in which the main power source is turned off by the operation of the operation unit 2 by the user (standby state). The sub power source supplies only the power supplied from the outside only to the control device 7 of the projector 1.

The image forming unit 4 forms an optical image under the control of the control device 7 and enlarges and projects it on the screen Sc. As shown in FIG. 1, the image forming unit 4 includes a light source device 41, a liquid crystal light valve 42 as a light modulation device, a projection optical device 43, a projection position adjusting device 44, and the like.
The light source device 41 emits a light beam toward the liquid crystal light valve 42 under the control of the control device 7. The light source device 41 includes a light source lamp 411 and a lamp driving unit 412.
The light source lamp 411 is configured by an ultra high pressure mercury lamp. It should be noted that other discharge light source lamps such as a metal halide lamp and a xenon lamp may be employed in addition to the ultra-high pressure mercury lamp. Furthermore, not only the discharge light source lamp, but various self-light emitting elements such as a light emitting diode, an organic EL (Electro Luminescence) element, and a silicon light emitting element may be employed.
The lamp driving unit 412 generates a driving signal according to a predetermined driving frequency under the control of the control device 7 and drives the light source lamp 411.

  The liquid crystal light valve 42 is a transmissive liquid crystal panel, changes the arrangement of liquid crystal molecules sealed in a liquid crystal cell (not shown) based on a drive signal from the control device 7, and is emitted from the light source device 41. An optical image corresponding to the image information is emitted to the projection optical device 43 by transmitting or blocking the light beam.

The projection optical device 43 enlarges and projects the optical image emitted from the liquid crystal light valve 42 toward the screen Sc. The projection optical device 43 includes a projection lens 431 and a lens driving unit 432.
FIG. 2 is a diagram schematically showing a main part of the projection lens 431. Specifically, FIG. 2 is a view of the main part of the projection lens 431 viewed from the optical axis direction. Since the configuration of the focus ring 431A and the focus lens 431B and the configuration of the zoom ring 431C and the zoom lens 431D are substantially the same, the same reference numerals are given to the same members in FIG.
The projection lens 431 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical barrel. The projection lens 431 enlarges and projects the optical image emitted from the liquid crystal light valve 42 through the plurality of lenses toward the screen Sc.

The lens barrel is configured by connecting a plurality of members, and supports a plurality of lenses by the plurality of members.
Of the plurality of members constituting the lens barrel, the focus ring 431A supports a focus lens 431B that contributes to focus adjustment of the projected image among the plurality of lenses, as shown in FIG. The focus lens 431B may be configured as a single lens, or may be configured as a lens group having a plurality of lenses. The focus ring 431A is configured to be rotatable with respect to other members around the lens optical axis O of the focus lens 431B, and moves to move the focus lens 431B in the optical axis direction with respect to the other lenses. Thus, the position of the focus lens 431B relative to another lens, which is the relative position of the plurality of lenses, is changed (the focus state is changed), and the focus adjustment of the projection image is performed. That is, the rotation position of the focus ring 431A corresponds to the focus state.
Specifically, as shown in FIG. 2, the focus ring 431A is rotated and the predetermined position P is moved in the direction of the arrow A1, so that the projected image can be adjusted to a focused state when the projection distance is short. The focus state is changed to the side. On the other hand, by moving the predetermined position P in the direction of the arrow A2, the focus state is changed to the far end side where the projection image can be adjusted to the in-focus state when the projection distance is long.

In addition, among the plurality of members constituting the lens barrel, the zoom ring 431C contributes to zoom adjustment of the projected image among the plurality of lenses, as shown in FIG. 2, similarly to the focus ring 431A described above. The zoom lens 431D is supported. The zoom lens 431D may be configured as a single lens, or may be configured as a lens group having a plurality of lenses, like the focus lens 431B described above. Alternatively, the zoom lens 431D may be configured by a plurality of lens groups, and at least one of the plurality of lens groups may be supported by the zoom ring 431C. The zoom ring 431C is configured to be rotatable with respect to other members around the lens optical axis O of the zoom lens 431D, and rotates to move the zoom lens 431D in the optical axis direction with respect to the other lenses. Thus, the position of the zoom lens 431D relative to another lens, which is the relative position of the plurality of lenses, is changed (the zoom state is changed), and zoom adjustment of the projected image is performed. That is, the rotation position of the zoom ring 431C corresponds to the zoom state.
Specifically, as shown in FIG. 2, by rotating the zoom ring 431C and moving the predetermined position P in the arrow A1 direction, the zoom state is changed to the tele end side where the contour of the projected image is reduced, By positioning the predetermined position P at the position R1, the zoom state is changed to the tele end where the contour of the projected image is minimized.
On the other hand, by moving the predetermined position P in the direction of the arrow A2, the zoom state is changed to the wide end side where the contour of the projected image is enlarged, and by positioning the predetermined position P at the position R2, the contour of the projected image is changed. The zoom state is changed to the wide end where becomes the maximum.

The lens driving unit 432 rotates the focus ring 431A and the zoom ring 431C of the projection lens 431 under the control of the control device 7. As shown in FIG. 1, the lens driving unit 432 includes a focus state changing unit 432A and a zoom state changing unit 432B.
The focus state changing unit 432A is configured by, for example, a pulse motor or the like, and rotates the focus ring 431A to move the focus lens 431B with respect to other lenses under the control of the control device 7, thereby changing the focus state. .
Similarly to the focus state changing unit 432A, the zoom state changing unit 432B is configured by, for example, a pulse motor or the like, and rotates the zoom ring 431C to control the zoom lens 431D with respect to other lenses under the control of the control device 7. To change the zoom state.
Note that the focus ring 431A and the zoom ring 431C may be rotated manually in addition to being driven by the lens driving unit 432.

FIG. 3 is a diagram showing a state of adjustment of the position of the projected image by the projection position adjusting device 44 and a state of changing the posture of the projector 1 by the posture changing unit 5.
The projection position adjusting device 44 supports the projection lens 431 so as to be movable in a direction orthogonal to the projection direction of the projection lens 431, and adjusts the position of the projection image on the screen Sc. As shown in FIG. 1, the projection position adjusting device 44 includes a projection position adjusting device main body 441 and an adjusting device driving unit 442.
The projection position adjusting device main body 441 supports the projection lens 431, and the vertical direction (arrow U direction and arrow D direction shown in FIG. 3) and the horizontal direction (arrow L shown in FIG. 3) orthogonal to the projection direction of the projection lens 431. And the position of the projected image on the screen Sc is adjusted in the up and down direction and the left and right direction. The projection position adjusting device main body 441 may be configured to include, for example, a fixed plate, a moving plate, a pressing member, and a drive mechanism, although not specifically illustrated.

The fixed plate is a member that is fixed inside the projector 1 so that its plate surface is substantially parallel to a plane orthogonal to the projection direction of the projection optical device 43, and supports the projection lens 431 and the projection position adjusting device 44 as a whole. .
The movable plate supports the projection lens 431, and along the plate surface of the fixed plate, the vertical direction (arrow U direction and arrow D direction shown in FIG. 3) and the horizontal direction (arrow L direction and arrow R shown in FIG. 3). Direction).
The pressing member presses and fixes the moving plate against the fixed plate in a state where the moving plate is movable.
The drive mechanism is composed of gears, link members, and the like, and is driven by an adjustment device drive unit 442 to move the moving plate in the vertical direction and the horizontal direction.

The adjustment device driving unit 442 includes, for example, a pulse motor, and drives the drive mechanism of the projection position adjustment device main body 441 under the control of the control device 7 to move the position of the projection image on the screen Sc.
The drive mechanism is driven by the adjustment device drive unit 442, connected to the drive mechanism, provided with a dial or the like exposed to the outside from the exterior casing of the projector 1, and manually rotated by rotating the dial. It is good also as a structure which drives the said drive mechanism.
Further, in the present embodiment, even if the projection lens 431 is moved within the mechanical limit range (the range in which the projection lens 431 can be mechanically moved) by the projection position adjusting device 44 described above, trapezoidal distortion is generated in the projected image 100. It shall not occur.

The lens position detection unit 8 detects the rotational positions of the focus ring 431A and the zoom ring 431C in the projection lens 431 and the movement position of the projection lens 431 by the projection position adjustment device 44 (hereinafter referred to as a lens shift position). As shown in FIG. 1, the lens position detection unit 8 includes a focus state detection unit 81, a zoom state detection unit 82, and a lens shift position detection unit 83 as a movement position detection unit.
The focus state detection unit 81 includes, for example, a rotary encoder disposed on the motor shaft of the focus state change unit 432A, and detects the rotational position of the focus ring 431A. Then, the focus state detection unit 81 outputs a signal corresponding to the detected rotational position to the control device 7. As described above, since the rotation position of the focus ring 431A corresponds to the focus state, the control device 7 recognizes the focus state by detecting the rotation position of the focus ring 431A by the focus state detection unit 81.
Similarly to the focus state detection unit 81, the zoom state detection unit 82 includes, for example, a rotary encoder disposed on the motor shaft of the zoom state change unit 432B, and detects the rotational position of the zoom ring 431C. Then, the zoom state detection unit 82 outputs a signal corresponding to the detected rotational position to the control device 7. As described above, since the rotation position of the zoom ring 431C corresponds to the zoom state, the control device 7 recognizes the zoom state by detecting the rotation position of the zoom ring 431C by the zoom state detection unit 82.

  Similarly to the focus state detection unit 81 and the zoom state detection unit 82, the lens shift position detection unit 83 includes, for example, a rotary encoder disposed on the motor shaft of the adjustment device driving unit 442, and the projection position adjustment device main body. The movement position of 441, that is, the lens shift position is detected. Then, the lens shift position detecting unit 83 outputs a signal corresponding to the detected lens shift position to the control device 7.

  Note that the lens position detection unit 8 may be configured so that the rotary encoder described above is a part other than the motor shaft as long as the rotation position of the focus ring 431A and the zoom ring 431C and the lens shift position in the projection lens 431 can be detected. It may also be arranged in a member other than the rotary encoder described above.

  Although not shown, the projector 1 includes three liquid crystal light valves 42 corresponding to the three colors RGB. The light source device 41 also includes a color light separation optical system that separates light source light into three colors of light. Further, the projection optical device 43 has a combining optical system that generates an optical image representing a color image by combining three color image lights. As for the configuration of such an optical system, various general projector optical system configurations can be used.

The posture changing unit 5 changes the vertical and horizontal tilt positions of the projector 1 under the control of the control device 7 and adjusts the position of the projected image on the screen Sc. As shown in FIG. 1, the posture change unit 5 includes a posture change unit main body 51 and a posture change drive unit 52.
As shown in FIG. 3, the posture changing unit main body 51 is provided at each of the front corners of the bottom surface of the projector 1. The posture changing unit main body 51 is configured to be able to move forward and backward in and out of the projector 1. When the projector 1 is installed in a normal posture, the tip end portion is grounded to a grounding surface such as a desk and moves forward and backward. The tilt position in the vertical direction and the horizontal direction is changed. As a result, the position of the projected image on the screen Sc moves in the vertical direction (arrow U direction and arrow D direction shown in FIG. 3) and also in the left-right direction (arrow L direction and arrow R direction shown in FIG. 3). The tilt state is changed.
The attitude change drive unit 52 is configured by, for example, a pulse motor or the like, and drives (advances / retreats) the attitude change unit main body 51 under the control of the control device 7 to change the tilt position of the projector 1.
The posture change unit main body 51 may be driven by the posture change drive unit 52 in addition to driving by the posture change drive unit 52.

The advance / retreat position detection unit 9 includes, for example, a rotary encoder disposed on the motor shaft of the attitude change drive unit 52, and detects the drive amount of the attitude change drive unit 52, that is, the advance / retreat position of the attitude change unit main body 51. To do. Then, the advance / retreat position detector 9 outputs a signal corresponding to the detected advance / retreat position to the control device 7.
The advance / retreat position detection unit 9 is provided with the above-described rotary encoder in a portion other than the motor shaft of the attitude change drive unit 52 as long as the advance / retreat position of the attitude change unit main body 51 can be detected. Alternatively, it may be composed of a member other than the rotary encoder described above.

  The imaging unit 6 images the projection target area including the projection surface Scf of the screen Sc under the control of the control device 7. The imaging unit 6 is constituted by, for example, a CCD camera including an area sensor using a CCD (Charge Coupled Device) as an imaging element, and outputs a signal corresponding to the captured projection target area to the control device 7.

  The control device 7 includes an arithmetic processing device such as a CPU (Central Processing Unit), executes a predetermined program, and performs a power supply unit 3, an image forming unit 4, an imaging unit 6, a lens position detection unit 8, and an advance / retreat position detection. Control unit 9 and the like. Then, the control device 7 causes the image forming unit 4 to form an image corresponding to an image signal input from an external device or the like, and controls the projection image to be positioned at a predetermined position on the projection surface Scf of the screen Sc. As shown in FIG. 1, the control device 7 includes a signal input unit 71, a liquid crystal panel drive control unit 72 as a display control device, a frame memory 73, a focus adjustment control unit 74, and a zoom adjustment control device. The zoom adjustment control part 75, the projection position control part 76 as a projection position control apparatus, and the memory | storage part 77 are provided.

The signal input unit 71 inputs image signals and the like output from various external devices, converts them into image signals that can be processed by the liquid crystal panel drive control unit 72, and outputs them. The image signal (digital image signal) output from the signal input unit 71 is temporarily recorded in the frame memory 73 as image data for each frame, for example.
The liquid crystal panel drive control unit 72 appropriately reads the image data output from the signal input unit 71 and sequentially stored in the frame memory 73, performs a predetermined process on the read image data, and corresponds to the processed image A drive signal as image information to be output is output to the liquid crystal light valve 42 to form a predetermined optical image. Examples of the predetermined processing in the liquid crystal panel drive control unit 72 include image size adjustment processing such as enlargement / reduction, trapezoidal distortion correction processing, image quality adjustment processing, and gamma correction processing. Note that image size adjustment processing such as enlargement / reduction, image quality adjustment processing, and gamma correction processing are well-known techniques, and thus will not be described in detail, and only the trapezoidal distortion correction processing will be described below. The liquid crystal panel drive control unit 72 includes a trapezoidal distortion correction unit 721 and a panel drive unit 722 as shown in FIG.

  The trapezoidal distortion correction unit 721 converts the advance / retreat position output from the advance / retreat position detection unit 9 into a distortion correction amount based on later-described distortion correction amount information stored in the storage unit 77. Then, the trapezoidal distortion correction unit 721 performs a trapezoidal distortion correction process for a projection image generated when the projector 1 performs a side projection on the image data read from the frame memory 73 according to the distortion correction amount. In the trapezoidal distortion correction process, for example, a digital process is performed in which the number of pixels in the scanning line is changed in units of a predetermined scanning line or the time axis is changed.

FIG. 4 is a diagram illustrating a specific example of the trapezoidal distortion correction process by the trapezoidal distortion correction unit 721.
For example, when vertical tilt projection is performed by tilting the projector 1 so that the image is projected upward, the optical axis of the light beam projected from the projector 1 is in the normal direction of the screen Sc plane. In contrast, as shown in FIG. 4A, the upper width of the projected image 100 projected on the screen Sc is wide and the lower width is narrow. At this time, the trapezoidal distortion correction unit 721 changes the frame memory 73 according to the distortion correction amount obtained by converting the advance / retreat position output from the advance / retreat position detection unit 9 in order to make the projection image 100 a projection image 100 ′ without distortion. The trapezoidal distortion correction process is performed on the image data read out from. In this trapezoidal distortion correction processing, as shown in FIG. 4B, the upper width of the formation region 421 that is preliminarily distorted in the direction opposite to the distortion state of the projection image 100 and forms an optical image on the liquid crystal light valve 42. The vertical distortion correction is performed to form the correction formation region 422 having a narrower and wider lower side. Further, the trapezoidal distortion correction unit 721 masks the formation area 421 by putting the area 423 excluding the correction formation area 422 into a blanking state.

Further, for example, even when horizontal tilt projection is performed by projecting the projector 1 so as to project an image in the horizontal direction, the optical axis of the light beam projected from the projector 1 is the method of the screen Sc plane. For example, as shown in FIG. 4C, the left side of the projected image 100 projected on the screen Sc is wide and the right side is narrow as shown in FIG. At this time, the trapezoidal distortion correction unit 34 converted the advance / retreat position output from the advance / retreat position detection unit 9 in order to make the projection image 100 a distortion-free projection image 100 ′ in substantially the same manner as the vertical distortion correction. The trapezoidal distortion correction process is performed on the image data read from the frame memory 73 in accordance with the distortion correction amount. In the trapezoidal distortion correction process, as shown in FIG. 4D, correction is performed in advance in the direction opposite to the distortion state of the projection image 100, the left width of the formation region 421 is narrowed, and the right width is widened. Lateral distortion correction for forming the formation region 422 is performed. Further, the trapezoidal distortion correction unit 721 masks the formation area 421 by putting the area 423 excluding the correction formation area 422 into a blanking state.
Then, the trapezoidal distortion correction unit 721 performs image data corresponding to the correction formation area 422 subjected to the trapezoidal distortion correction processing, and a black image representing black in order to make the area 423 correspond to the area 423 and display nothing. Data is output to the panel driver 722.

  The panel drive unit 722 outputs drive signals corresponding to the image data and black image data output from the trapezoidal distortion correction unit 721 to the liquid crystal light valve 42. Then, the liquid crystal light valve 42 forms an optical image that has been subjected to the trapezoidal distortion correction process in accordance with the drive signal.

The focus adjustment control unit 74 drives the focus state change unit 432A that constitutes the lens drive unit 432 of the projection optical device 43 in accordance with the operation signal from the operation unit 2 and the control signal from the projection position control unit 76. The focus adjustment of the projection image displayed on the screen Sc is performed.
For example, the focus adjustment control unit 74 changes the focus state in response to an operation signal from the operation unit 2 when a setting input for causing the operation unit 2 to change the focus state by a predetermined amount is performed by the user. Manual adjustment control is performed to drive the unit 432A and rotate the focus ring 431A to change the focus state by a predetermined amount.

Further, for example, the focus adjustment control unit 74 is an operation that is output from the operation unit 2 when a user inputs a setting to change the focus state until the projection image is in focus on the operation unit 2. The following automatic adjustment control is performed according to the signal and the control signal from the projection position control unit 76.
That is, the focus adjustment control unit 74 causes the imaging unit 6 to capture a projected image that is enlarged and projected on the screen Sc while driving the focus state changing unit 432A to rotate the focus ring 431A to change the focus state. Then, the focus adjustment control unit 74 analyzes the image captured by the imaging unit 6. Thereafter, the focus adjustment control unit 74 determines a focus position where the projection image is in focus, and drives the focus state change unit 432A to change the focus state to the focus position. When the automatic adjustment control is performed, for example, the adjustment pattern image having a predetermined pattern shape in which white and black lines are arranged in parallel is projected on the screen Sc, and the adjustment imaged by the imaging unit 6 is used. A configuration may be adopted in which the focus position where the adjustment pattern image is in focus is determined based on the pattern image.

The zoom adjustment control unit 75 drives the zoom state change unit 432B that constitutes the lens drive unit 432 of the projection optical device 43 in accordance with the operation signal from the operation unit 2 and the control signal from the projection position control unit 76. The zoom adjustment of the projected image displayed on the screen Sc is performed.
For example, the zoom adjustment control unit 75 changes the zoom state according to the operation signal from the operation unit 2 when the user inputs to the operation unit 2 a setting to reduce the outline of the projected image. The unit 432B is driven to rotate the zoom ring 431C, and the zoom state is changed to the tele end side (arrow A2 direction shown in FIG. 2).
Further, for example, when the user inputs a setting for enlarging the outline of the projected image to the operation unit 2, the zoom adjustment control unit 75 performs zooming according to an operation signal from the operation unit 2. The state changing unit 432B is driven to rotate the zoom ring 431C, and the zoom state is changed to the wide end side (in the direction of arrow A2 shown in FIG. 2).
Further, for example, when the user inputs a setting for positioning the projection image at a predetermined position on the projection surface of the screen Sc to the operation unit 2, the zoom adjustment control unit 75 adjusts the position from the operation unit 2. In response to the operation signal as information, the zoom state changing unit 432B is driven to rotate the zoom ring 431C, and the zoom state is changed to the wide end where the contour of the projected image is maximized. Further, the zoom adjustment control unit 75 drives the zoom state changing unit 432B and rotates the zoom ring 431C in accordance with a control signal from the projection position control unit 76, thereby changing the zoom state to a predetermined zoom state.

  The projection position control unit 76 adjusts the projection position based on an image captured by the imaging unit 6 in accordance with an operation signal as position adjustment information output from the operation unit 2 by a setting input of the operation unit 2 by the user. The adjustment device driving unit 442 constituting the device 44 and / or the posture changing driving unit 52 constituting the posture changing unit 5 is drive-controlled, and a projection image enlarged and projected on the screen Sc is displayed at a predetermined position on the projection surface of the screen Sc. Projection position adjustment control is performed. As shown in FIG. 1, the projection position control unit 76 includes a calibration image display control unit 761, a luminance value calculation unit 762, an outer edge information generation unit 763, a movement determination unit 764, and a drive control unit 765. Prepare.

The calibration image display control unit 761 outputs a predetermined control command to the liquid crystal panel drive control unit 72, and causes the liquid crystal light valve 42 to form a calibration image based on calibration image information described later stored in the storage unit 77. Control is performed by the liquid crystal panel drive controller 72.
The luminance value calculation unit 762 calculates, for each pixel, the luminance value in the projection target area including the projection surface of the screen Sc and the projection image (calibration image) based on the image captured by the imaging unit 6. .

  Based on each luminance value calculated by the luminance value calculation unit 762, the outer edge information generation unit 763 includes at least a part of the outer edge portion on the projection surface of the screen Sc and the outer edge portion in the projection image within the projection target area. At least one of at least one part is recognized, and outer edge information related to the recognized outer edge (coordinate values, etc.) is generated.

The movement determination unit 764 determines the movement direction of the projection image based on the outer edge information generated by the outer edge information generation unit 763.
In addition, the movement determination unit 764 generates the outer edge information by recognizing the entire outer edge of the rectangular frame shape on the projection surface of the screen Sc and the entire outer edge of the rectangular frame shape in the projection image. Recognizes the center positions of the projection plane and the projection image (center positions of the respective outer edge portions of the rectangular frame shape) based on the outer edge information. Then, the movement determination unit 764 determines a movement direction and a movement amount for the center position of the projection image to match the center position of the projection surface.

  The drive control unit 765 drives and controls the adjustment device drive unit 442 constituting the projection position adjustment device 44 and / or the posture change drive unit 52 constituting the posture change unit 5, and the movement direction determined by the movement determination unit 764. The projection image is moved to (movement amount), and the projection image is positioned at a predetermined position on the projection surface of the screen Sc.

As illustrated in FIG. 1, the storage unit 77 includes a distortion correction amount information storage unit 771 and a calibration image information storage unit 772.
The distortion correction amount information storage unit 771 corrects trapezoidal distortion of the projected image when the pair of posture change unit main bodies 51 are positioned at the forward / backward positions and the pair of posture change unit main bodies 51 are positioned at the respective forward / backward positions. The distortion correction amount information associated with the distortion correction amount is stored. For example, a look-up table can be used as the distortion correction amount information.
The calibration image information storage unit 772 stores calibration image information related to a calibration image for performing projection position adjustment control by the projection position control unit 76.
As the calibration image, for example, an image in which the entire area is white can be adopted. By adopting such an image, it is possible to clarify a difference in luminance value between a region where the projection image is projected and another region within the projection target region. For this reason, the outer edge information generation unit can recognize the outer edge portion with higher accuracy.

[Projector control method]
Next, a method for controlling the projector 1 described above will be described.
In the following, projection position adjustment control will be mainly described, and description of other controls will be omitted.
5 to 7 are flowcharts for explaining the projection position adjustment control of the projector 1.
First, the control device 7 constantly monitors whether or not an operation signal from the position adjustment information input unit 21 has been input, that is, whether or not the user has operated the position adjustment information input unit 21 (step S1).
In step S <b> 1, when the control device 7 determines “Y”, that is, when it is determined that the position adjustment information input unit 21 is operated by the user, the calibration image display control unit of the projection position control unit 76. 761 outputs a predetermined control command to the liquid crystal panel drive control unit 72. Then, the liquid crystal panel drive control unit 72 reads the calibration image information stored in the calibration image information storage unit 772 and causes the liquid crystal light valve 42 to form a calibration image based on the calibration image information. The calibration image formed via the projection lens 431 is enlarged and projected toward the screen Sc (step S2).

After step S2, the zoom adjustment control unit 75 drives the zoom state change unit 432B according to the operation signal as the position adjustment information output from the operation unit 2, rotates the zoom ring 431C, and displays the projected image. The zoom state is changed to the wide end R2 (FIG. 2) where the contour is maximized (step S3).
After step S3, the control device 7 drives the imaging unit 6 to image the projection target area including the projection surface of the screen Sc and the projection image (calibration image) (step S4: imaging step).
After step S4, the luminance value calculation unit 762 of the projection position control unit 76 calculates the luminance value in the projection target area for each pixel based on the image captured by the imaging unit 6 (step S5: Luminance value calculation step).

After step S5, the outer edge information generation unit 763 of the projection position control unit 76, based on each luminance value in the projection target area calculated by the luminance value calculation unit 762, at least the outer edge portion on the projection surface of the screen Sc. A part is recognized, and outer edge information related to the recognized outer edge is generated (step S6: outer edge information generating step).
Specifically, the outer edge information generation unit 763 calculates a difference in luminance value between adjacent pixels in the projection target area. Further, the outer edge information generation unit 763 recognizes a boundary position (coordinate value) between pixels at which the calculated luminance value difference between the pixels is equal to or greater than the first threshold as an outer edge portion of the projection surface of the screen Sc.

8 and 9 are diagrams illustrating an example of an image captured by the imaging unit 6.
For example, in the example shown in FIG. 8, a part of the projection image 100 is projected below the projection surface Scf of the screen Sc in the projection target area Ar. For this reason, the projection target area Ar is divided into three areas: an area where the projection image 100 within the projection surface Scf is projected, an area where the projection image 100 is not projected, and an area other than the projection surface Scf. Here, since the projection surface Scf of the screen Sc is generally composed of a member having a high reflectance, the area other than the projection surface Scf and the region on which the projection image 100 is projected within the projection surface Scf of the screen Sc. The difference in luminance value between the areas is the largest. For this reason, the outer edge information generation unit 763 calculates the boundary position between the pixels where the difference in luminance value between the pixels is equal to or greater than the first threshold value, as shown in FIG. The position Bp (coordinate value) is recognized as the outer edge portion of the projection surface Scf of the screen Sc.
For example, in the example illustrated in FIG. 9, a part of the projection image 100 is projected on the lower right corner portion of the projection surface Scf of the screen Sc in the projection target area Ar. For this reason, the outer edge information generation unit 763 calculates the boundary position between the pixels where the difference in luminance value between the pixels is equal to or greater than the first threshold value, as shown in FIG. The position Bp (coordinate value) is recognized as the outer edge portion of the projection surface Scf of the screen Sc.
Then, the outer edge information generation unit 763 generates outer edge information (information regarding the coordinate value of the boundary position) regarding the recognized outer edge, and outputs the generated information to the movement determination unit 764.

After step S6, the movement determination unit 764 of the projection position control unit 76 determines whether or not the projection surface Scf of the screen Sc is included in the projection image 100 based on the outer edge information generated by the outer edge information generation unit 763. Is determined (step S7).
Specifically, the movement determination unit 764 recognizes the shape of the outer edge portion on the projection surface Scf of the screen Sc based on the outer edge information output from the outer edge information generation unit 763. Then, the movement determination unit 764 determines whether or not the recognized shape of the outer edge portion is a rectangular frame shape. Here, the movement determination unit 764 determines that the projection surface Scf of the screen Sc is included in the projected image 100 when it is determined that the shape is a rectangular frame, and the projection is performed when it is determined that it is not a rectangular frame. It is determined that the projection surface Scf of the screen Sc is not included in the image 100.

In step S7, when the movement determination unit 764 determines “N”, that is, when it is determined that the projection surface Scf of the screen Sc is not included in the projected image 100, as shown in FIG. Based on the outer edge information generated by the information generation unit 763, the movement direction of the projection image is determined (step S8: movement determination step).
Specifically, the movement determination unit 764 recognizes the shape of the outer edge portion on the projection surface Scf of the screen Sc based on the outer edge information output from the outer edge information generation unit 763. Then, the movement determination unit 764 determines the movement direction of the projection image based on the recognized shape of the outer edge.
For example, in the example illustrated in FIG. 8, the movement determination unit 764 recognizes the shape of the outer edge as an approximately U-shape opened upward, and the direction toward the opening, that is, the upward direction, is the projected image. The moving direction is determined as M1.
Further, for example, in the example illustrated in FIG. 9, the movement determination unit 764 recognizes the shape of the outer edge portion as a substantially L shape opened in the upper left direction, and the direction toward the opening side, that is, the left direction and the upper direction. Is determined as the movement direction M1 of the projection image.
Then, the movement determination unit 764 outputs a signal corresponding to the determined movement direction M1 to the drive control unit 765.

  After step S8, the drive control unit 765 outputs a predetermined control command to the lens shift position detection unit 83 in accordance with the signal from the movement determination unit 764, and causes the lens shift position detection unit 83 to detect the lens shift position. (Step S9). Then, the lens shift position detection unit 83 outputs a signal corresponding to the detected lens shift position to the drive control unit 765.

After step S9, the drive control unit 765 determines that the lens shift position is based on the lens shift position detected by the lens shift position detection unit 83, and the drive of the projection position adjusting device main body 441 is mechanically limited. It is determined whether or not a limit position (a position at which the projection lens 431 can no longer be moved) has been reached (step S10).
For example, the drive control unit 765 compares the lens shift position detected by the lens shift position detection unit 83 with a mechanical limit position stored in a memory (not shown), and determines whether or not they are the same. If they are the same, it is determined that the machine limit position has been reached, and if they are not the same, it is determined that the machine limit position has not been reached.
For example, the drive control unit 765 compares the lens shift position detected by the lens shift position detection unit 83 with the lens shift position previously detected by the lens shift position detection unit 83, and is the same. If it is the same, it is determined that the machine limit position has been reached, and if it is not the same, it is determined that the machine limit position has not been reached.

In step S10, when the drive control unit 765 determines “N”, that is, when it is determined that the position of the projection lens 431 has not reached the mechanical limit position, the adjustment device drive that constitutes the projection position adjustment device 44 is driven. By driving the unit 442 and driving the projection position adjusting device main body 441, the projection image is moved by a predetermined amount in the movement direction determined by the movement determination unit 764 in step S8 (step S11: drive control step). .
For example, in the example illustrated in FIG. 8, the drive control unit 765 controls the adjustment device drive unit 442 to drive the projection position adjustment device main body 441 because the movement direction M1 determined by the movement determination unit 764 is the upward direction. By driving, the projected image is moved upward by a predetermined amount.
Further, for example, in the example shown in FIG. 9, the drive control unit 765 controls the drive of the adjustment device drive unit 442 and performs projection since the movement direction M1 determined by the movement determination unit 764 is the left direction and the upward direction. By driving the position adjustment device main body 441, the projection image is moved by a predetermined amount in the left direction, and the projection image is moved by a predetermined amount in the upward direction.
After step S11, as shown in FIG. 5, the control device 7 includes the projection surface Scf of the screen Sc in the projection image 100 until the movement determination unit 764 determines “Y” in step S7. Steps S4 to S11 are repeated until it is determined.

  On the other hand, when the drive control unit 765 determines “Y” in step S10, that is, when it is determined that the lens shift position has reached the mechanical limit position, a predetermined control command is sent to the advance / retreat position detection unit 9. Then, the advance / retreat position detection unit 9 detects the advance / retreat position of the posture change unit main body 51 constituting the posture change unit 5 (step S12). Then, the advance / retreat position detector 9 outputs a signal corresponding to the detected advance / retreat position to the drive controller 765.

After step S12, the drive control unit 765 determines a mechanical limit position (posture change unit main body) where the forward / backward position of the posture change unit main body 51 is mechanically limited based on the forward / backward position detected by the forward / backward position detection unit 9. It is determined whether or not 51 has reached a position where it is impossible to move 51 any more (step S13).
For example, a determination method that is substantially the same as the determination method in step S10 described above can be used to determine whether or not the advance / retreat position of the posture change unit main body 51 has reached a limit position that is mechanically limited.

In step S13, when the drive control unit 765 determines “N”, that is, when it is determined that the advance / retreat position of the posture change unit main body 51 has not reached the machine limit position, the posture constituting the posture change unit 5 By driving and controlling the change driving unit 52 and driving the posture changing unit main body 51, the projection image is moved by a predetermined amount in the moving direction determined by the movement determining unit 764 in step S8 (step S14).
After step S14, the trapezoidal distortion correction unit 721 of the liquid crystal panel drive control unit 72 distorts the advance / retreat position output from the advance / retreat position detection unit 9 based on the distortion correction amount information stored in the distortion correction amount information storage unit 771. Conversion to a correction amount is performed, and a trapezoidal distortion correction process of the projected image is performed according to the converted distortion correction amount (step S15).
In step S15, the trapezoidal distortion correction unit 721 performs the trapezoidal distortion correction process, thereby correcting the trapezoidal distortion generated in the projected image 100 by moving the posture changing unit main body 51 back and forth in step S14.

After step S15, as shown in FIG. 5, the control device 7 includes the projection surface Scf of the screen Sc in the projection image 100 until the movement determination unit 764 determines “Y” in step S7. Steps S4 to S15 are repeated until it is determined.
Even if steps S4 to S15 are repeatedly performed, if the movement determination unit 764 determines “N” in step S7 and the drive control unit 765 determines “N” in step S13, that is, the movement determination unit in step S8. If the projection surface Scf of the screen Sc does not enter the projected image 100 even if both the projection lens 431 and the posture changing unit main body 51 are moved to the respective mechanical limit ranges in the movement direction determined in 764, control is performed. The device 7 performs error determination and notifies the user that the projection position adjustment control cannot be performed (step S16).
As this error determination, it is only necessary to inform the user that the projection position adjustment control cannot be performed. For example, when the error determination is performed, a message indicating that there is an error such as “NG” in the projection image , Displaying a predetermined LED (Light Emitting Diode) or the like, and turning on the LED when error determination is performed, and various notification methods can be employed.

FIG. 10 is a diagram illustrating an example of an image captured by the imaging unit 6.
Here, as shown in FIG. 10, the projection surface Scf of the screen Sc enters the projection image 100 by the above-described steps S4 to S11 and steps S4 to S15. In step S7, the movement determination unit 764 indicates “Y”. In other words, when it is recognized that the shape (boundary position Bp) of the outer edge portion of the projection surface Scf of the screen Sc is a substantially rectangular frame shape, the outer edge information generated by the outer edge information generating unit 763 Based on this, the center position (coordinate value) on the projection surface Scf of the screen Sc is recognized (step S16).
Specifically, the movement determination unit 764 is based on the outer edge information generated by the outer edge information generation unit 763, and the coordinate values of the four corner positions P <b> 1 to P <b> 4 in the rectangular frame-shaped outer edge portion on the projection surface Scf of the screen Sc. Recognize The movement determination unit 764 then intersects the straight line L1 connecting the diagonal positions P1 and P3 and the straight line L2 connecting the diagonal positions P2 and P4 based on the coordinate values of the four corner positions P1 to P4. The position is recognized as the center position Os (coordinate value). Then, the projection position control unit 76 outputs a predetermined signal to the zoom adjustment control unit 75.

After step S16, the zoom adjustment control unit 75 drives the zoom state changing unit 432B according to the signal output from the projection position control unit 76, rotates the zoom ring 431C, and sets the zoom state to the tele end side. Only the fixed amount is changed (step S17).
After step S17, similarly to step S4 described above, the control device 7 drives the imaging unit 6 to image the projection target area Ar including the projection surface Scf of the screen Sc and the projection image 100 (step S18).
After step S18, the luminance value calculation unit 762 calculates the luminance value in the projection target area for each pixel based on the image captured by the imaging unit 6 in the same manner as step S5 described above (step S5). S19).

After step S19, the outer edge information generation unit 763 recognizes and recognizes at least a part of the outer edge portion of the projection image 100 based on each luminance value in the projection target area calculated by the luminance value calculation unit 762. Outer edge information relating to the outer edge is generated (step S20).
Specifically, the outer edge information generation unit 763 calculates a difference in luminance value between adjacent pixels in the projection target area. In addition, the outer edge information generation unit 763 calculates the boundary position (coordinate value) between the pixels where the calculated luminance value difference between the pixels is greater than or equal to the second threshold and less than the first threshold described above. Recognize as part.

FIG. 11 is a diagram illustrating an example of an image captured by the imaging unit 6.
For example, in the example illustrated in FIG. 11, the projection image 100 is projected on the projection surface Scf of the screen Sc in the projection target area Ar. Here, in the projection surface Scf of the screen Sc, the difference in luminance value between the region where the projection image 100 is projected and the region other than the projection image 100 is the projection image 100 in the examples of FIGS. 8 and 9 described above. Becomes the next largest difference in luminance value between the projected area and the area other than the projection surface Scf. For this reason, the outer edge information generation unit 763 calculates the boundary position between the pixels where the difference in luminance value between the pixels is equal to or greater than the second threshold value and less than the first threshold value. The rectangular frame-shaped boundary position Bp (coordinate value) is recognized as the outer edge of the projection image 100.
Then, the outer edge information generation unit 763 generates outer edge information (information regarding the coordinate value of the boundary position) regarding the recognized outer edge, and outputs the generated information to the movement determination unit 764.

After step S20, the movement determination unit 764 determines whether or not a projection image is included in the projection surface Scf of the screen Sc based on the outer edge information generated by the outer edge information generation unit 763 (step S21). .
Specifically, the movement determination unit 764 recognizes the shape of the outer edge portion in the projection image 100 based on the outer edge information output from the outer edge information generation unit 763. Then, the movement determination unit 764 determines whether or not the recognized shape of the outer edge portion is a rectangular frame shape. Here, the movement determination unit 764 determines that the projection image 100 is within the projection surface Scf of the screen Sc when it is determined that the shape is a rectangular frame as in the example illustrated in FIG. 11, and is not a rectangular frame. If it is determined that the projection image 100 is not within the projection surface Scf of the screen Sc.

  If the movement determination unit 764 determines “N” in step S21, that is, if it is determined that the projection image 100 is not within the projection surface Scf of the screen Sc, the control device 7 again performs step S17. Returning to step S17 to S21. That is, in step S21, the zoom state is changed to the tele end side to reduce the contour of the projection image 100 until the projection image 100 enters the projection surface Scf of the screen Sc.

In step S21, when the movement determination unit 764 determines “Y”, that is, when it is determined that the projection image 100 is within the projection surface Scf of the screen Sc, the movement edge determination unit 764 sends the information to the outer edge information generation unit 763. The center position (coordinate values) in the projection image 100 is recognized based on the outer edge information generated in step S22.
Specifically, the movement determination unit 764 calculates the coordinate values of the four corner positions P1 ′ to P4 ′ in the outer edge of the rectangular frame in the projection image 100 based on the outer edge information generated by the outer edge information generation unit 763. recognize. Then, based on the coordinate values of the four corner positions P1 ′ to P4 ′, the movement determination unit 764 connects the straight line L1 ′ connecting the diagonal positions P1 ′ and P3 ′ and the diagonal positions P2 ′ and P4 ′. Is recognized as the center position Ot (coordinate value).

  After step S22, the movement determination unit 764 obtains the center position Os (coordinate value) on the projection surface Scf of the screen Sc recognized in step S16 and the center position Ot (coordinate value) of the projection image 100 recognized in step S22. In comparison, the movement directions M2, M3 and the movement amounts MJ2, MJ3 for moving the projection image 100 to match the center position Os and the center position Ot are determined (step S23). Then, the movement determination unit 764 outputs a signal corresponding to the determined movement directions M2, M3 and movement amounts MJ2, MJ3 to the drive control unit 765.

After step S23, the drive control unit 765 controls the adjustment device drive unit 442 according to the signal from the movement determination unit 764, and drives the projection position adjustment device main body 441. The projection image is moved by the movement amounts MJ2 and MJ3 in the determined movement directions M2 and M3, and the center position Ot of the projection image 100 is matched with the center position Os of the projection surface Scf (step S24). Then, the projection position control unit 76 outputs a predetermined signal to the focus adjustment control unit 74.
After step S24, the focus adjustment control unit 74 performs automatic adjustment control for changing the focus state to the in-focus position of the projection image 100 in accordance with the signal from the projection position control unit 76 (step S25).

  In the first embodiment described above, the projector 1 includes the projection position adjusting device 44, the operation unit 2, the imaging unit 6, and the projection position control unit 76. For example, the projector 1 is once installed on the screen Sc. Even when the position is changed and a part of the projection image 100 protrudes outside the projection surface Scf of the screen Sc, the user can simply press the position adjustment information input unit 21 of the operation unit 2 to partially However, the projected image 100 that protrudes outside the projection surface Scf can be automatically positioned again within the projection surface Scf of the screen Sc. For this reason, unlike the prior art, it is not necessary for the user to perform the complicated work of rotating the first dial and the second dial again, and the convenience of the projector 1 can be improved.

  In addition, when the projector 1 includes the attitude change unit 5 and the drive control unit 765 constituting the projection position control unit 76 performs the projection position adjustment control, both the projection position adjustment device 44 and the attitude change unit 5 are driven and controlled. . For this reason, when performing the projection position adjustment control, for example, only the projection position adjustment device 44 is driven and controlled, and the projection image is positioned within the projection surface Scf of the screen Sc even when the lens shift position reaches the machine limit position. If not, it is possible to position the projection image 100 within the projection surface Scf of the screen Sc by driving the posture changing unit 5 to move the position of the projection image 100. For this reason, by driving both the projection position adjusting device 44 and the posture changing unit 5, the movement range of the projection image 100 can be expanded, and the projection image 100 can be positioned well within the projection surface Scf of the screen Sc. The convenience of the projector 1 can be further improved.

  Here, the projector 1 includes an advance / retreat position detection unit 9 and a trapezoidal distortion correction unit 721. Thus, the attitude changing unit 5 is driven and controlled by the projection position adjustment control, so that the trapezoidal distortion can be automatically corrected even when the tilt position of the projector 1 is changed and the keystone distortion occurs in the projected image 100. The projection image 100 positioned in the projection surface Scf of the screen Sc by the projection position adjustment control can be a good projection image 100 without distortion.

Further, the outer edge information generation unit 763 constituting the projection position control unit 76 recognizes the boundary position (coordinate value) only by comparing the difference of each luminance value between adjacent pixels with the first threshold value or the second threshold value. The boundary position is recognized as at least a part of the outer edge part on the projection surface Scf of the screen Sc and at least a part of the outer edge part in the projection image 100. For this reason, an outer edge part can be recognized rapidly with a simple structure, and projection position adjustment control can be implemented more rapidly.
Furthermore, the movement determination unit 764 constituting the projection position control unit 76 determines the shape of the projection surface Scf of the screen Sc and the outer edge of the projection image 100 (substantially U-shaped or substantially L-shaped) based on the outer edge information. The movement direction of the projection image 100 is determined based on the recognized shape. Thereby, the determination of the moving direction can be performed with high accuracy, and the projected image 100 can be positioned more favorably in the projection surface Scf of the screen Sc.

  In addition, when the outer edge information generation unit 763 recognizes the projection surface Scf of the screen Sc and the entire outer edge portion of the projection image 100 and generates outer edge information, the movement determination unit 764 generates a projection surface based on the outer edge information. The center positions Os and Ot of Scf and the projected image 100 are recognized. Then, based on the recognized center positions Os and Ot, the movement determination unit 764 moves the movement directions M2 and M3 and the movement amount for matching the center position Ot of the projection image 100 with the center position Os of the projection surface Scf. Determine MJ2 and MJ3. Accordingly, the projection position adjusting device 44 and the attitude changing unit 5 are driven and controlled, and the projection image 100 is moved in the movement directions M2 and M3 by the movement amounts MJ2 and MJ3, thereby not only within the projection surface Scf of the screen Sc. The projected image 100 can be positioned at a predetermined position on the projection surface Scf, and the convenience of the projector 1 can be further improved.

  Here, the luminance value calculation unit 762 constituting the projection position control unit 76 calculates the luminance value in the projection target area Ar for each pixel based on the image captured by the imaging unit 6. Thereby, for example, the outer edge information generation unit 763 compares the luminance value in the projection target area Ar with a predetermined plurality of positions instead of each pixel, that is, the screen. The projection surface Scf of Sc and the outer edge of the projection image 100 can be recognized with higher accuracy, and the movement determination unit 764 can determine the movement directions M1, M2, M3 and the movement amounts MJ2, MJ3 with higher accuracy, and the screen Sc The projection image 100 can be positioned with high accuracy at a predetermined position on the projection surface Scf.

  Furthermore, when the projector 1 includes the zoom adjustment control unit 75 and the position adjustment information input unit 21 is operated by the user, the zoom state changing unit 432B is driven and controlled so that the contour of the projection image 100 is maximized. Let the edge change the zoom state. Thereby, the projection position adjustment control can be performed in a state where the contour of the projection image 100 is maximized, that is, a part of the projection image 100 is projected on the screen Sc by maximizing the contour of the projection image 100. It is easy to project on the surface Scf, and the outer edge information generation unit 763 can easily recognize at least a part of the outer edge of the projection surface Scf of the screen Sc and at least a part of the outer edge of the projection image 100. Therefore, the outer edge information generation unit 763 can reliably generate the outer edge information, and the projection image can be more reliably positioned at a predetermined position on the projection surface Scf of the screen Sc.

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
FIG. 12 is a block diagram showing a schematic configuration of a projector 1 ′ in the second embodiment.
FIG. 13 and FIG. 14 are diagrams for explaining the projector 1 ′ in the second embodiment. Specifically, FIG. 13 is a side view showing a projection state of the projector 1 ′. FIG. 14 is a front view showing the screen Sc and the whiteboard Wb on which the projector 1 ′ projects an optical image.
In the first embodiment, the projector 1 performs projection position adjustment control when it is installed in a normal state.
On the other hand, in the second embodiment, as shown in FIG. 13, the projector 1 ′ is installed in a ceiling-suspended state (a state where the top surface and the bottom surface of the projector 1 ′ are reversed). Projection position adjustment control is performed. In other words, in the present embodiment, the projector 1 ′ is not installed on a grounding surface such as a desk, but is installed in a ceiling-suspended state. Further, as shown in FIG. 12, an installation state input unit 22 for inputting an installation state is provided in the operation unit 2 ′ constituting the projector 1 ′. Further, in the projector 1 ′, as shown in FIG. 12, the lens shift position and zoom state (rotation of the zoom ring 431C) set in the conventional projection position adjustment control are stored in the storage unit 77 ′ constituting the control device 7 ′. Position) and a movement position information storage unit 773 that stores movement position information regarding the focus state (the rotation position of the focus ring 431A). Furthermore, as shown in FIG. 12, an information storage input unit 23 for storing the movement position information in the movement position information storage unit 773 is provided in the operation unit 2 ′ constituting the projector 1 ′. Further, as shown in FIG. 12, a reposition adjustment information input unit 24 for positioning the projection image at the previous position is provided in the operation unit 2 ′ constituting the projector 1 ′. Other configurations are the same as those in the first embodiment.

The installation state input unit 22 is an input button for driving the projector 1 ′ in the ceiling suspended state when the projector 1 ′ is installed in the ceiling suspended state. Then, the installation state input unit 22 recognizes the pressing by the user and outputs an operation signal indicating that the installation state is suspended from the ceiling to the control device 7 ′.
Here, when the liquid crystal panel drive control unit 72 receives an operation signal from the installation state input unit 22, an optical image formed by the liquid crystal light valve 42 with respect to the image data read from the frame memory 73. Is processed upside down, and a drive signal as image information corresponding to the processed image data is output to the liquid crystal light valve 42 to form a predetermined optical image.
In addition, when the operation signal from the installation state input unit 22 is input, the movement determination unit 764 raises or lowers the movement direction of the projection image relative to the determination of the movement direction of the projection image described in the first embodiment. Is determined in reverse.

As shown in FIG. 13 or FIG. 14, the information storage input unit 23 performs projection position adjustment control on the screen Sc installed at a predetermined position (in the example of FIG. 13 and FIG. 14, suspended from the ceiling). This is an input button for storing movement position information related to the focus state, zoom state, and lens shift position in the movement position information storage unit 773 after execution. Then, the information storage input unit 23 outputs an operation signal for recognizing the press by the user and storing the movement position information to the control device 7 '.
Here, when the operation signal from the information storage input unit 23 is input, the control device 7 ′ uses the signals output from the focus state detection unit 81, the zoom state detection unit 82, and the lens shift position detection unit 83. Based on this, the focus state, zoom state, and lens shift position are recognized, and the movement position information storage unit 773 stores movement position information regarding these positions.

As shown in FIG. 13 or FIG. 14, the reposition adjustment information input unit 24 performs projection position adjustment control on the movably configured whiteboard Wb, and then again determines the projection surface Scf of the screen Sc. This is an input button for positioning the projection image 100 at the projection position of the projection image 100 when the projection position adjustment control was previously performed on the screen Sc when the projection image 100 is projected to the position. Then, the reposition adjustment information input unit 24 recognizes the press by the user and again sends an operation signal as reposition adjustment information for positioning the projection image 100 on the projection surface Scf of the screen Sc to the control device 7 ′. Output.
Here, when the operation signal from the re-position adjustment information input unit 24 is input, the control device 7 ′ reads the movement position information stored in the movement position information storage unit 773, and the lens driving unit 432 and the adjustment device. The drive unit 442 is driven and controlled, and the focus ring 431A, the zoom ring 431C, and the projection position adjusting device main body 441 are positioned in the focus state, the zoom state, and the lens shift position based on the movement position information.

[Projector control method]
Next, a method for controlling the projector 1 ′ described above will be described.
In the following, projection position adjustment control will be mainly described, and description of other controls will be omitted. Further, the description of the same processing as the projection position adjustment control described in the first embodiment will be simplified. Furthermore, in the following, the whiteboard Wb is not installed at the position shown in FIG. 13 or FIG. 14, and the projection position adjustment control described in the first embodiment is performed on the screen Sc in advance, and the projection of the screen Sc is performed. Assume that a projection image is projected at a predetermined position on the surface Scf.

FIG. 15 is a flowchart for explaining the projection position adjustment control of the projector 1 ′.
First, the control device 7 ′ constantly monitors whether or not an operation signal is input from the information storage input unit 23, that is, whether or not the information storage input unit 23 is operated by the user (step S31).
In step S31, when the control device 7 ′ determines “Y”, that is, when it is determined that the information storage input unit 23 is operated by the user, the focus state detection unit 81, the zoom state detection unit 82, The current focus state, zoom state, and lens shift position are recognized based on the signal output from the lens shift position detection unit 83, and the movement position information storage unit 773 stores the movement position information regarding these positions ( Step S32).

After step S32, the user installs the whiteboard Wb at the position shown in FIG. 13 or FIG. 14 in order to project the projection image from the projector 1 ′ onto the whiteboard Wb (step S33).
After step S33, the user operates the position adjustment information input unit 21. Then, in response to the operation signal from the position adjustment information input unit 21, the control device 7 ′ adjusts the projection position so that the projection image 100 is positioned at a predetermined position on the projection surface Wbf of the whiteboard Wb. Control is performed (step S34).
Note that the projection position adjustment control for the whiteboard Wb is substantially the same as the projection position adjustment control (FIGS. 5 to 7) described in the first embodiment. Specifically, since the projection position adjustment control for the whiteboard Wb is configured not to use the posture changing unit 5 in the present embodiment as described above, in steps S1 to S25 shown in FIGS. S15 is omitted, and when the drive control unit 765 determines “Y” in step S10, the error determination (step S16) described in the first embodiment is performed. Further, the determination of the movement direction of the projection image 100 by the movement determination unit 764 is upside down with respect to the determination of the movement direction of the projection image 100 described in the first embodiment.

After step S34, in order to project the projection image from the projector 1 'onto the screen Sc again, the user places the whiteboard Wb at a position that does not block the optical image projected from the projector 1' toward the screen Sc. Remove (step S35).
After step S35, the control device 7 'constantly monitors whether or not the operation signal from the reposition adjustment information input unit 24 has been input, that is, whether or not the user has operated the reposition adjustment information input unit 24. (Step S36).

In step S 36, when the control device 7 ′ determines “Y”, that is, when it is determined that the reposition adjustment information input unit 24 is operated by the user, the control device 7 ′ is stored in the movement position information storage unit 773. The movement position information is read (step S37).
After step S37, the drive control unit 765 of the projection position control unit 76 controls the adjustment device drive unit 442 and drives the projection position adjustment device main body 441, so that the lens shift position based on the read movement position information is obtained. The projection position adjusting device main body 441 is positioned (step S38).
After step S38, the zoom adjustment control unit 75 drives the zoom state change unit 432B to change the rotation position of the zoom ring 431C (zoom lens 431D) to the zoom state based on the read movement position information (step S39). .
After step S39, the focus adjustment control unit 74 drives the focus state changing unit 432A to change the rotation position of the focus ring 431A (focus lens 431B) to the focus state based on the read movement position information (step S40). .
By the processing of steps S36 to S40 described above, the projection image 100 is projected when the projection position adjustment control has been performed on the screen Sc from the state where the projection image 100 is positioned at the predetermined position on the projection surface Wbf of the whiteboard Wb. Will be positioned.

On the other hand, when the control device 7 ′ determines “N” in step S 36, that is, when it is determined that the re-position adjustment information input unit 24 is not operated by the user, the position adjustment information input unit 21. It is constantly monitored whether or not the operation signal from is input, that is, whether or not the position adjustment information input unit 21 is operated by the user (step S41).
In step S41, when the control device 7 ′ determines “Y”, that is, when it is determined that the position adjustment information input unit 21 is operated by the user, the projection position adjustment control for the whiteboard Wb described above is performed. Similarly, projection position adjustment control for the screen Sc is performed (step S42).

  In the second embodiment described above, as compared with the first embodiment, the movement position information storage unit 773 is provided in the storage unit 77 ′ constituting the projector 1 ′, and the reposition adjustment information is provided in the operation unit 2 ′. An input unit 24 is provided. Therefore, after the projection position adjustment control is performed on the screen Sc, the movement position information storage unit 773 can store movement position information regarding the current focus state, zoom state, and lens shift position. Further, after the projection position adjustment control is performed on the whiteboard Wb, the user operates the reposition adjustment information input unit 24 when the projection image 100 is positioned again at a predetermined position on the projection surface Scf of the screen Sc. Only on the basis of the movement position information stored in the movement position information storage unit 773, the control device 7 ′ moves the focus ring 431A, the zoom ring 431C, and the projection position adjustment device main body 441 to the previous focus based on the movement position information. The state, zoom state, and lens shift position can be changed. Therefore, it is possible to reduce the load applied to the projection position control unit 76 of the projector 1 ′ without causing the projector 1 ′ to perform the projection position adjustment control again, and to quickly return to the predetermined position on the projection surface Scf of the screen Sc. The positioning of the projection image 100 can be performed quickly.

[Third embodiment]
Next, 3rd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the first embodiment, when the control device 7 performs the projection position adjustment control, the outer edge information generating unit 763 can generate outer edge information after the luminance value calculating unit 762 calculates the luminance value. That is, when the control device 7 performs the projection position adjustment control, the projector 1 is in a state in which a part of the projected image 100 is projected onto the projection surface Scf of the screen Sc.
On the other hand, in 3rd Embodiment, when the control apparatus 7 implements projection position adjustment control, when the projection image 100 projected from the projector 1 is not projected on the projection surface Scf of the screen Sc, ie, an outer edge When the outer edge information cannot be generated by the information generation unit 763, the projection position of the projection image 100 so that a part of the projection image 100 is projected onto the projection surface Scf of the screen Sc and the outer edge information generation unit 763 can generate the outer edge information. Is changed to search for the projection surface Scf of the screen Sc.

Specifically, the outer edge information generation unit 763 cannot generate outer edge information, that is, the projection image 100 is not projected onto the projection surface Scf of the screen Sc, and at least a part of the outer edge portion of the projection surface Scf of the screen Sc. Is not recognized, a signal indicating that it cannot be recognized is output to the drive control unit 765. The outer edge information generation unit 763 outputs a signal indicating that the outer edge information has been recognized to the drive control unit 765 when at least a part of the outer edge portion on the projection surface Scf of the screen Sc can be recognized by the projection surface search control. .
In addition to the functions described in the first embodiment, the drive control unit 765 responds to the signal indicating that it cannot be recognized from the outer edge information generation unit 763 and the adjustment device drive unit 442 that configures the projection position adjustment device 44 and / or Alternatively, the projection position adjusting device main body 441 and / or the posture changing unit main body are controlled until the posture changing driving unit 52 constituting the posture changing unit 5 is driven and controlled, and the signal indicating that the recognition has been performed from the outer edge information generating unit 763 is input. 51 is moved over the entire machine limit range.

[Projector control method]
Next, a method for controlling the projector 1 described above will be described.
In the following, projection surface search control will be mainly described, and description of other projection position adjustment control described in the first embodiment will be omitted.
FIG. 16 is a flowchart for explaining projection plane search control of the projector 1 according to the third embodiment.
FIG. 17 is a diagram for explaining the projection plane search control.
After the luminance value calculation step (step S5) described in the first embodiment, the outer edge information generation unit 763 performs screen Sc based on each luminance value in the projection target area calculated by the luminance value calculation unit 762. It is determined whether or not at least a part of the outer edge portion on the projection surface cannot be recognized, that is, whether or not generation of outer edge information is impossible (step S51).

  When the outer edge information generation unit 763 determines “N” in step S51, that is, when it is determined that the outer edge information can be generated, the outer edge information generation step described in the first embodiment (step S6). ). Then, the outer edge information generation unit 763 outputs a signal indicating that the outer edge portion on the projection surface of the screen Sc has been recognized to the drive control unit 765, and the drive control unit 765 stops the projection surface search control.

On the other hand, in step S51, when the outer edge information generation unit 763 determines “Y”, that is, as shown in FIG. 17, the entire projection image 100 projected from the projector 1 deviates from the projection surface Scf of the screen Sc. When it is determined that the outer edge portion of the projection surface Scf of the screen Sc cannot be recognized and the generation of the outer edge information is impossible, a signal indicating that the outer edge portion of the projection surface Scf of the screen Sc cannot be recognized is output to the drive control unit 765. Output to.
The drive control unit 765 drives and controls the adjustment device drive unit 442 and drives the projection position adjustment device main body 441 in accordance with the unrecognizable signal output from the outer edge information generation unit 763, so that a predetermined value is obtained. The projection image is moved by a predetermined amount in a direction (for example, in the upward direction M4 and the left direction M5 in the example of FIG. 17) (step S52).

After step S52, the drive control unit 765 outputs a predetermined control command to the lens shift position detection unit 83, and causes the lens shift position detection unit 83 to detect the lens shift position (step S53). Then, the lens shift position detection unit 83 outputs a signal corresponding to the detected lens shift position to the drive control unit 765.
After step S53, the drive control unit 765 enables the movement of the projection lens 431 based on the lens shift position detected by the lens shift position detection unit 83 to be mechanically limited (the projection lens 431 can be moved mechanically). It is determined whether or not the entire range has been implemented (step S54).
For example, the determination method as to whether or not the movement of the projection lens 431 has been performed over the entire mechanical limit range can employ a determination method substantially similar to the determination method of step S10 described in the first embodiment.

  In step S54, when the drive control unit 765 determines “N”, that is, when it is determined that the movement of the projection lens 431 is not performed over the entire mechanical limit range, the control device 7 again Returning to step S4 (FIG. 5), steps S4, S5, S51 to S54 are performed. That is, steps S4, S5, and S51 to S54 are repeatedly performed until the outer edge information generation unit 763 determines “N” in step S51, that is, until it is determined that the outer edge information can be generated.

  On the other hand, in step S54, when the drive control unit 765 determines “Y”, that is, the projection lens 431 is moved over the entire mechanical restriction range, the projection image 100 of the screen Sc is projected on the screen Sc. When a part of the image is not projected, the posture change drive unit 52 is driven and controlled, and the posture change unit main body 51 is driven to move in a predetermined direction (for example, the upward direction M4 and the left direction M5 in the example of FIG. 17). The projection image is moved by a predetermined amount (step S55).

After step S55, the drive control unit 765 outputs a predetermined control command to the advance / retreat position detection unit 9, and causes the advance / retreat position detection unit 9 to detect the advance / retreat position of the posture changing unit main body 51 (step S56). Then, the advance / retreat position detection unit 9 outputs a signal corresponding to the detected advance / retreat position to the drive control unit 765 and the trapezoidal distortion correction unit 721.
After step S56, the trapezoidal distortion correction unit 721 converts the advance / retreat position output from the advance / retreat position detection unit 9 into a distortion correction amount based on the distortion correction amount information stored in the distortion correction amount information storage unit 771. A trapezoidal distortion correction process for the projected image is performed according to the distortion correction amount (step S57).
After step S57, the drive control unit 765 mechanically moves the posture change unit main body 51 based on the advance / retreat position detected by the advance / retreat position detection unit 9 (mechanically moves the posture change unit main body 51 forward / backward). It is determined whether or not the entire range has been implemented (step S58).
For example, the determination method as to whether or not the movement of the posture changing unit main body 51 has been performed over the entire machine restriction range can employ a determination method substantially similar to the determination method in step S13 described in the first embodiment.
In step S58, when the drive control unit 765 determines “N”, that is, when it is determined that the movement of the posture changing unit main body 51 is not performed over the entire machine restriction range, the control device 7 Returning to step S4 again, steps S4, S5, S51 to S58 are performed. That is, steps S4, S5, S51 to S58 are repeatedly performed until the outer edge information generation unit 763 determines “N” in step S51, that is, until it is determined that the outer edge information can be generated.

  On the other hand, in step S58, when the drive control unit 765 determines “Y”, that is, the movement of the projection lens 431 and the movement of the posture changing unit main body 51 are performed over the entire machine restriction range, the projection of the screen Sc is performed. When a part of the projection image 100 is not projected on the surface Scf, error determination is performed and projection position adjustment control cannot be performed for the user, as in step S16 described in the first embodiment. Is notified (step S59).

In the third embodiment described above, as compared with the first embodiment, the drive control unit 765 projects the projection image on the projection surface Scf of the screen Sc when the outer edge information generation unit 763 cannot generate outer edge information. When a part of 100 is not projected, the projection position adjustment is performed until the outer edge information generation unit 763 generates outer edge information, that is, until a part of the projection image 100 is projected onto the projection surface Scf of the screen Sc. Driving and controlling the device 44 and the posture changing unit 5,
The position of the projection image 100 is moved. Thus, even when a part of the projection image 100 is not projected on the projection surface Scf of the screen Sc, the projection image 100 is positioned at a predetermined position in the projection surface Scf of the screen Sc by the projection position adjustment control. Therefore, the convenience of the projector 1 can be further improved.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In each of the embodiments, the projection position adjusting device 44 is configured to move the projection lens 431 in both the vertical direction (vertical direction) and the horizontal direction (horizontal direction) orthogonal to the projection direction, but is not limited thereto. For example, the projection position adjusting device 44 may be any configuration as long as the projection lens 431 is movably supported in a plane orthogonal to the projection direction. For example, the projection lens 431 is only in the vertical direction or the horizontal direction. It is good also as a structure which moves.

In the first embodiment and the third embodiment, when the projection position adjustment control is performed, both the projection position adjustment device 44 and the posture changing unit 5 are driven and controlled. Similarly to the embodiment, a configuration in which only the projection position adjusting device 44 is driven and controlled may be applied.
Similarly, in the second embodiment, when the projection position adjustment control is performed, the posture changing unit 5 is not used. However, the configuration is not limited thereto. For example, the tip of the posture changing unit body 51 and the ceiling are fixed. In addition, similar to the first embodiment and the third embodiment, both the projection position adjusting device 44 and the posture changing unit 5 may be driven and controlled.

  In the first embodiment and the third embodiment, the trapezoidal distortion is not generated in the projected image 100 due to the movement of the projection lens 431 by the projection position adjusting device 44, and the trapezoidal distortion correcting unit 721 is the posture changing unit main body 51. Although the trapezoidal distortion correction processing is performed according to the forward / backward position, the present invention is not limited to this. For example, in the case of a configuration in which trapezoidal distortion occurs in the projected image 100 due to the movement of the projection lens 431 by the projection position adjusting device 44, the trapezoidal distortion correction unit 721 performs the trapezoidal distortion correction processing in consideration of the lens shift position. It is good also as a structure to implement. In this case, the distortion correction amount information storage unit 771 stores distortion correction amount information in which the lens shift position and the advance / retreat position are associated with the distortion correction amount.

  In each of the embodiments described above, in steps S17 to S21 shown in FIG. 7, the projection image 100 is put in the projection surface Scf of the screen Sc while changing the zoom state by a predetermined amount toward the tele end side. Not limited to. For example, if the projection image 100 does not enter the projection surface Scf of the screen Sc during the execution of steps S17 to S21, the processing of steps S8 to S16 shown in FIG. You may employ | adopt the structure which moves this position.

In each of the above embodiments, in the projection position adjustment control, the projection image 100 is moved so that the center position Ot of the projection image 100 matches the center position Os of the projection surface Scf of the screen Sc. Not limited to this, the projected image 100 may be moved within the projection surface Scf of the screen Sc or to a predetermined position on the projection surface Scf.
In each of the embodiments, the movement determination unit 764 determines the movement direction of the projection image 100 based on the projection surface Scf of the screen Sc and the shape of the outer edge portion of the projection image 100. However, the movement determination unit 764 is not limited to this. When the area surrounded by the portion expands when the projected image 100 is moved, the direction may be determined as the moving direction of the projected image 100.

In the third embodiment, the configuration in which the projection surface search control is adopted in the first embodiment has been described. However, the present invention is not limited to this, and the projection surface search control may be adopted in the second embodiment.
In each of the embodiments, each edge of the outer edge portion of the projection surface Scf of the screen Sc is parallel to each edge of the outer edge portion of the projection image 100, that is, the projection image 100 is inclined with respect to the horizontal direction. However, for example, based on the outer edge information, it is determined whether or not the edges of the outer edge portions are parallel. If it is determined that they are not parallel, the posture change unit 5 is driven and controlled. And you may employ | adopt the structure which makes the edge of each outer edge part parallel (it makes the projection image 100 the state which is not inclined with respect to a horizontal direction).

In each of the above embodiments, three liquid crystal panels (liquid crystal light valves 42) are employed as the light modulation device. However, the present invention is not limited to this, and it is only necessary to have one or more liquid crystal panels.
In each of the above embodiments, a transmissive liquid crystal panel (liquid crystal light valve 42) is employed as the light modulation device. However, the present invention is not limited to this, and a reflective liquid crystal panel or digital micromirror device (Texas Instruments) is used. May be a GLV (Grating Light Valve) device (trademark of Silicon Light Machines) utilizing the diffraction phenomenon of light.

Although the best configuration for carrying out the present invention has been disclosed in the above description, the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but it is not intended to depart from the technical concept and scope of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

  The projector of the present invention is useful as a projector used for presentations and home theaters because a projection image can be automatically positioned within the projection surface of the screen.

1 is a block diagram showing a schematic configuration of a projector according to a first embodiment. The figure which shows typically the principal part of the projection lens in the said embodiment. The figure which shows the adjustment state of the position of the projection image by the projection position adjustment apparatus in the said embodiment, and the change state of the attitude | position of the projector by an attitude | position change part. The figure which shows the specific example of the trapezoid distortion correction process by the trapezoid distortion correction part in the said embodiment. 7 is a flowchart for explaining projection position adjustment control of the projector in the embodiment. 7 is a flowchart for explaining projection position adjustment control of the projector in the embodiment. 7 is a flowchart for explaining projection position adjustment control of the projector in the embodiment. The figure which shows an example of the image imaged in the imaging part in the said embodiment. The figure which shows an example of the image imaged in the imaging part in the said embodiment. The figure which shows an example of the image imaged in the imaging part in the said embodiment. The figure which shows an example of the image imaged in the imaging part in the said embodiment. The block diagram which shows schematic structure of the projector in 2nd Embodiment. The figure for demonstrating the projector in the said embodiment. The figure for demonstrating the projector in the said embodiment. 7 is a flowchart for explaining projection position adjustment control of the projector in the embodiment. 10 is a flowchart for explaining projection plane search control of a projector according to a third embodiment. The figure for demonstrating the projection surface search control in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1 '... Projector, 2, 2' ... Operation part (setting input part), 5 ... Attitude change part, 6 ... Imaging part (imaging apparatus), 9 ... Advance / retreat position detection 41, light source device, 42 ... liquid crystal light valve (light modulation device), 43 ... projection optical device, 44 ... projection position adjusting device, 72 ... liquid crystal panel drive control unit (display) Control device), 75 ... zoom adjustment control unit (zoom adjustment control device), 76 ... projection position control unit (projection position control device), 83 ... lens shift position detection unit (movement position detection unit), DESCRIPTION OF SYMBOLS 100 ... Projection image, 431 ... Projection lens, 432B ... Zoom state change part, 721 ... Trapezoid distortion correction part, 722 ... Panel drive part (light modulation apparatus drive part), 762 ... Luminance value calculation unit, 763... Outer edge information generation unit, 764. Fixed unit, 765... Drive control unit, 773... Movement position information storage unit, M1, M2, M3... Movement direction, Os, Ot... Center position, Sc. Projection surface, S4: Imaging step, S5: Luminance value calculation step, S6: Outer edge information generation step, S8: Movement determination step, S11: Drive control step.

Claims (10)

A light modulation device that modulates a light beam emitted from a light source, a display control device that controls the light modulation device, and an enlarged projection of the light beam modulated by the light modulation device on a screen to generate a projected image on the screen And a projection position adjusting device that movably supports the projection optical device in a plane orthogonal to the projection direction of the projection optical device and adjusts the position of the projection image on the screen. Projector,
Based on the position adjustment information, a setting input unit for setting and inputting position adjustment information for positioning the projection image within the projection surface of the screen, an imaging device for imaging a projection target area including the projection surface of the screen, and the position adjustment information A projection position control device that drives the projection position adjustment device to perform projection position adjustment control for positioning the projection image within the projection surface of the screen;
The projection position control device
A luminance value calculation unit that calculates each luminance value at a plurality of predetermined positions in the projection target region based on an image captured by the imaging device;
Based on each luminance value, in the projection target area, at least one of the outer edge portion of the projection surface of the screen and at least one of the outer edge portion of the projection image is recognized, and the outer edge information is recognized. An outer edge information generation unit for generating
A movement determination unit that determines a movement direction of the projection image based on the outer edge information;
A projector comprising: a drive control unit that drives and controls the projection position adjusting device, moves the projection image in the determined movement direction, and positions the projection image within a projection plane of the screen. The projector according to claim 1, wherein
The projector is configured to freely move in and out of the projector, and includes a posture changing unit that changes the posture of the projection image by changing the posture of the projector by moving the front end portion to the outside and moving forward and backward.
The drive control unit drives and controls the projection position adjusting device and the posture changing unit when performing the projection position adjustment control. The projector according to claim 2,
An advancing / retreating position detecting unit for detecting an advancing / retreating position of the posture changing unit;
The display control device includes:
Based on the advance / retreat position detected by the advance / retreat position detection unit, the input image information is subjected to a trapezoidal distortion correction process, and the trapezoidal distortion of the projection image generated when tilting projection is performed by the projector is corrected. A trapezoidal distortion correction unit,
A projector comprising: a light modulation device driving unit that controls the light modulation device based on image information subjected to the trapezoidal distortion correction process. The projector according to any one of claims 1 to 3,
The outer edge information generation unit recognizes a boundary at which a difference between luminance values of adjacent positions in the predetermined plurality of positions is equal to or greater than a first threshold as at least a part of the outer edge portion on the projection surface of the screen, Recognizing a boundary where a difference between luminance values at adjacent positions in a plurality of predetermined positions is not less than a second threshold and less than the first threshold as at least a part of an outer edge in the projection image, Projector. The projector according to any one of claims 1 to 4,
The movement determination unit recognizes at least one of a shape of at least a part of an outer edge part on the projection surface of the screen and at least a part of an outer edge part in the projection image based on the outer edge information, and the recognition A projector that determines a moving direction of the projection image based on the shape. The projector according to any one of claims 1 to 5,
When the outer edge information generation unit recognizes the entire outer edge portion on the projection surface of the screen and the entire outer edge portion in the projection image and generates outer edge information, the movement determination unit, based on the outer edge information, Recognizing the center position of the projection surface and the center position of the projection image, and determining the movement direction of the projection image for positioning the projection image at a predetermined position of the projection surface based on the recognized center position;
The drive control unit, when performing the projection position adjustment control, moves the projection image in the determined movement direction and positions the projection image at a predetermined position on the projection surface of the screen. The projector according to any one of claims 1 to 6,
When the drive control unit performs the projection position adjustment control, the outer edge information generation unit is at least one of at least part of the outer edge part on the projection surface of the screen and at least part of the outer edge part in the projection image. When the outer edge information cannot be generated without being recognized, the projector moves the position of the projection image until the outer edge information generation unit generates the outer edge information. The projector according to any one of claims 1 to 7,
The projection optical device changes a zoom state of the projection lens in order to perform zoom adjustment of a projection lens that magnifies and projects the light beam modulated by the light modulation device onto the screen, and a projection image that is magnified and projected onto the screen. A zoom state changing unit,
A zoom adjustment control device that performs zoom adjustment control to drive the zoom state change unit to change the zoom state;
The zoom adjustment control device drives and controls the zoom state changing unit based on the position adjustment information, and changes the zoom state in a direction in which an outline of the projection image is enlarged. The projector according to any one of claims 1 to 8,
A movement position detector for detecting a movement position of the projection optical apparatus by the projection position adjustment apparatus;
A movement position information storage unit that stores movement position information related to the movement position of the projection optical device detected by the movement position detection unit after the projection position adjustment control by the projection position control device;
The setting input unit is configured to be able to set and input re-position adjustment information for positioning the projection image at a previous position,
The drive control unit drives and controls the projection position adjustment device based on the reposition adjustment information, and moves the projection optical device to a movement position based on the movement position information. A light modulation device that modulates a light beam emitted from a light source, a display control device that controls the light modulation device, and an enlarged projection of the light beam modulated by the light modulation device on a screen to generate a projected image on the screen And a projection position adjusting device that movably supports the projection optical device in a plane orthogonal to the projection direction of the projection optical device and adjusts the position of the projection image on the screen. A method for controlling a projector,
An imaging step of imaging a projection target area including a projection surface of the screen;
A luminance value calculating step for calculating each luminance value at a plurality of predetermined positions in the projection target area based on the captured image;
Based on each luminance value, in the projection target area, at least one of the outer edge portion of the projection surface of the screen and at least one of the outer edge portion of the projection image is recognized, and the outer edge information. An outer edge information generation step for generating
A movement determination step of determining a movement direction of the projection image based on the outer edge information;
And a drive control step of driving and controlling the projection position adjusting device, and moving the projection image in the determined moving direction to position the projection image in the projection plane of the screen. Method.

Images