JP2019009762A - Projection apparatus, projection method, and program - Google Patents

Abstract

To set an environment for projecting an image with higher quality as possible in consideration with an effect of a surface as a projected object.SOLUTION: A projection apparatus comprises: a projection part 17 that projects an image; a projection unit shifter 18 that mechanically changes a direction of the image projected by the projection part 17; a photographing part 23 that projects the image in a projected object projected by the projection part 17; and a CPU 24 that determines a projection direction by the projection unit shifter 18 on the basis of a plurality of projection images photographed by the photographing part 23, sets the projection unit shifter 18 so as to be the projection direction determined, and corrects and sets at least one of a region of the image projected by the projection part 17 and color information.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projection apparatus, a projection method, and a program.

  There has been proposed a technology of a projection display device that detects the amount of lens shift of the projection lens and performs an optimal unevenness correction on the projection screen to obtain a high-quality projection image. (For example, Patent Document 1)

JP 2003-018502 A

  The technology described in the above patent document is a projection type display device having a lens shift function that changes the direction of the optical axis of a projection lens with respect to the optical axis of a liquid crystal panel that displays an image to be projected. It has been proposed to correct color unevenness and illuminance unevenness caused by misalignment of system components, and correction data is created for each partial region of an image to be projected.

  By the way, when assuming an environment where projection is performed using a wall or curtain of a general house instead of a dedicated screen as a projection target, the surface on which the image is projected is not necessarily a white and smooth plane. In the case of projecting an image on such a surface with some pattern or a surface with unevenness, it is conceivable that the image quality of the projected image is greatly reduced due to the influence of the surface to be projected. Such a point related to the environment on the projection target side is not considered in the technique described in the above-mentioned patent document.

  The present invention has been made in view of the above circumstances, and its object is to set an environment for projecting an image with the highest possible image quality in consideration of the influence of the surface to be projected. It is an object to provide a projection device, a projection method, and a program that can be used.

  One embodiment of the present invention acquires a projection unit that projects an image, a projection direction variable unit that mechanically varies the direction of an image projected by the projection unit, and an image on a projection target that is projected by the projection unit. An acquisition unit; and a control unit that determines a projection direction by the projection direction variable unit based on information of a plurality of projection images acquired by the acquisition unit.

  According to the present invention, it is possible to set an environment for projecting an image with the highest possible image quality in consideration of the influence of the surface to be projected.

1 is a block diagram showing a functional configuration mainly of an electronic circuit of a projector according to a first embodiment of the present invention. 6 is a flowchart showing processing details of initial setting before the projection operation according to the embodiment. The figure which illustrates the shift range by the projection unit shifter in the 1st operation example which concerns on the embodiment. The figure which illustrates the projection environment in the 1st operation example which concerns on the embodiment. The figure which illustrates the case where the effective projection area | region and real projection area | region in the 1st operation example which concern on the embodiment are set. The figure which shows the change of the tilt angle and projection area at the time of installing the projector toward the upright wall surface in the 2nd operation example which concerns on the embodiment. The figure which illustrates the position of the effective projection area | region according to the tilt angle in the 2nd operation example which concerns on the same embodiment, a message, and a shape in an overlapping manner. The figure which compares and shows the case where the effective projection area | region according to the tilt angle in the 2nd operation example which concerns on the embodiment, and the rectangular actual projection area | region are set. The figure which shows the projection apparatus using autonomous type robot 10 'which concerns on the 2nd Embodiment of this invention. The figure which shows the operation example which concerns on the same embodiment. The figure which selects an optimal projection surface from the spatial image obtained when actually projecting an image, and projects an image automatically in the operation example which concerns on the embodiment.

Hereinafter, an embodiment in which the present invention is applied to a projector will be described in detail with reference to the drawings.
[Constitution]
FIG. 1 is a block diagram mainly showing a functional configuration of an electronic circuit of the projector 10 according to the present embodiment. In the figure, an image input unit 11 includes, for example, a pin jack (RCA) type video input terminal, a D-sub 15 type RGB input terminal, an HDMI (registered trademark) (High-Definition Multimedia Interface) terminal, and a USB (Universal Serial Bus). ) Terminals etc. An analog or digital image signal of various standards input to the image input unit 11 or stored in a USB memory and selectively read out is digitized as necessary by the image input unit 11 and then the bus B Is sent to the projection image drive unit 12 via

  The projection image driving unit 12 determines the frame rate according to a predetermined format in accordance with the transmitted image data, for example, 120 [frame / second] when the input image data is 60 [Hz] and the color component. The micromirror element 13 as a display element is driven to display by faster time-division driving obtained by multiplying the number of divisions and the number of display gradations.

  The micromirror element 13 performs a display operation by individually turning on / off each tilt angle of a plurality of micromirrors arranged in an array, for example, horizontal 1280 pixels × vertical 960 pixels, so that the reflected light is reflected. To form an optical image.

  On the other hand, primary color lights of R, G, and B are emitted cyclically from the light source unit 14 in a time division manner. The light source unit 14 includes an LED, which is a semiconductor light emitting element, and repeatedly emits R, G, and B primary color lights in a time-sharing manner. The LED included in the light source unit 14 may include an LD (semiconductor laser) or an organic EL element as an LED in a broad sense. The primary color light from the light source unit 14 is totally reflected by the mirror 15 and applied to the micromirror element 13.

  Then, an optical image is formed by the reflected light from the micromirror element 13, and the formed optical image is projected to the outside through the projection lens unit 16 and displayed.

  The projection lens unit 16 includes a focus lens for moving a focus position and a zoom lens for changing a zoom (projection) angle of view in an internal lens optical system.

  The micromirror element 13, the light source unit 14, the mirror 15, and the projection lens unit 16 constitute a projection unit 17 in which an optical member is integrated in an internal housing. The projection unit 17 is provided with a projection unit shifter (projection direction variable unit) 18 including a stepping motor, a driver circuit thereof, and a gear mechanism that conducts rotation driving of the motor.

  The projection unit 17 is mechanically driven by the projection unit shifter 18 so that, for example, the direction of the projection light emitted from the projection lens unit 16 is along the top-and-bottom direction while the housing of the projector 10 is horizontally placed. Can be shifted within the range.

  On the other hand, in the present embodiment, an imaging unit (acquisition unit) 23 that captures the projection direction of the projection lens unit 16 is provided. The photographing unit 23 has a photographing lens unit 19. The photographic lens unit 19 includes a zoom lens for changing the photographic angle of view and a focus lens for moving the focus position, and includes an image projected by the projection unit 17 including a shift range in the projection direction. In order to allow photographing, the projection lens unit 16 has a photographing field angle larger than the projected field angle emitted when the projection lens unit 16 is at the widest angle. An external light image entering the photographing lens unit 19 is formed on a CMOS image sensor, which is a solid-state image sensor, or an image sensor 20 such as a CCD used in an industrial camera.

  An image signal obtained by imaging with the image sensor 20 is digitized by an A / D converter 21 and then sent to a captured image processing unit 22.

  The captured image processing unit 22 scans and drives the imaging element 20 to execute a capturing operation, and extracts a projected image region by image recognition processing such as contour extraction on image data obtained by capturing, and within the projected image region. The distance distribution and the color distribution based on the focus lens in-focus position are respectively acquired.

  A CPU (control unit) 24 controls all operations of the above circuits. The CPU 24 is directly connected to the main memory 25 and the program memory 26. The main memory 25 is composed of, for example, an SRAM and functions as a work memory for the CPU 24. The program memory 35 is composed of an electrically rewritable nonvolatile memory, for example, a flash ROM, and various fixed data such as an operation program executed by the CPU 24 and an OSD (On Screen Display) image superimposed on a base image. Remember.

  The CPU 24 controls the projector 10 in an integrated manner by reading out the operation program, fixed data, and the like stored in the program memory 26, developing and storing them in the main memory 25, and executing the program. .

  The CPU 24 executes various projection operations according to operation signals from the operation unit 27. The operation unit 27 includes an operation key provided on the main body of the projector 10 or a light receiving unit that receives an infrared modulation signal from a remote controller dedicated to the projector 10 (not shown). The operation unit 27 receives the key operation signal and receives the key. A signal corresponding to the operation signal is sent to the CPU 24.

The CPU 24 is further connected to the audio processing unit 28 and the tilt leg driver 29 via the bus B.
The sound processing unit 28 includes a sound source circuit such as a PCM sound source, converts the sound signal given during the projection operation into an analog signal, drives the speaker unit 30 to emit sound, or generates a beep sound or the like as necessary.

  The tilt leg driver 29 drives a motor (not shown) for changing the leg length of one to two legs provided on the lower front end of the projector 10 casing so as to extend or shorten the leg length. .

[First operation example]
Next, a first operation example of the above embodiment will be described.
Here, the operation at the time of initial setting based on the shift amount adjustment before the actual projection operation by the projector 10 is started will be described. At the initial setting, the projection unit shifter 18 shifts the projection direction of the projection unit 17 up and down within a predetermined range, so that the most necessary color correction amount within the shift range is small, and the image to be projected is not uncomfortable. Select a position where can be projected.

  FIG. 2 is a flowchart showing the contents of processing by the CPU 24. Initially, the CPU 24 accepts an operation for setting the upper limit and lower limit positions of the shift range by the projection unit shifter 18 by a key operation from the operation unit 27 (step S101).

In this case, the projection unit 17 projects an image that is entirely white based on the projection zoom angle of view set at that time. The user of the projector 10 projects in advance so as to avoid an obstacle such as an indoor unit of an air conditioner, for example, in the vicinity of the shift upper limit position according to the situation of the surface to be projected. By performing an operation for lowering the position of the image, the upper limit value of the shift range can be recognized on the projector 10 side.
Note that the processing in step S101 may be omitted if unnecessary.

  Thereafter, the CPU 24 shoots the effective projection area by the photographing unit 23 within the shift range by the projection unit shifter 18 as many times as necessary (step S102).

  FIG. 3 illustrates the shift range by the projection unit shifter 18. In this embodiment, the effective projection area shifted by 40 [%] upward (+) as shown in FIG. 3A from the effective projection area IA0 serving as the reference of the zero shift amount shown in FIG. It is possible to select and set the shift position in a stepless manner within the range up to IA1 and up to the effective projection area IA2 shifted by 40 [%] downward (−) as shown in FIG. Shall.

  When the maximum shift amount by the projection unit shifter 18 is ± 50 [%] or less, the entire shift range can be covered by two photographings. On the other hand, when the shift amount exceeds ± 50 [%], three or more times of photographing are necessary to cover the entire shift range.

  FIG. 4 illustrates a case where the effective projection area by the projector 10 is shifted around the corner portion CN sandwiched between the left wall LW and the right wall RW. Here, as described above, assuming that the maximum shift amount is 40 [%] in the upper and lower directions, the effective projection area IA1 shifted upward by 40 [%] and the effective projection area IA2 shifted downward by 40 [%] Show.

  In this way, the CPU 24 performs a process such as comparing histograms of RGB components in the captured image data based on the result of capturing a plurality of effective projection areas IA1 and IA2 that cover the shiftable range. A shift amount of an effective projection region corresponding to an image with the least necessary color correction amount is selected as a region in which an image can be projected without a sense of incompatibility within the plane (step S103).

  The CPU 24 sets the image projection with the selected shift amount in the projection unit shifter 18 (step S104). Next, the CPU 24 calculates color correction information for each pixel so that the projection image in the effective projection area cancels the influence of the color or pattern of the wall surface to be projected (step S105), and the calculated color correction information. Is set in the projection image drive unit 12 (step S106).

  Further, the CPU 24 sets digital correction such as automatic trapezoid correction including reduction of the range of the image displayed on the micromirror element 13, which is set in advance at that time (step S107).

  For example, in the projection environment as shown in FIG. 4 above, the distance from the projection lens unit 16 of the projector 10 to the wall surface to be projected is not constant, the left and right ends are closest, and the substantially center corner CN is the longest. Projection distance.

  Therefore, when a rectangular image is projected from the projector 10, a deformed hexagonal image in which the corner portion CN is most widened is projected. For this reason, the CPU 24 recognizes the effective projection area from the photographed image of the photographing unit 23, and combines the two trapezoids with the corner portion CN as the common upper base and the left and right sides of the rectangle as the lower base, respectively. By changing the shape of the image area to be displayed by the micromirror element 13 so that the actual projection area in the effective projection area can be set.

  FIG. 5 illustrates a case where the actual projection area RAn is set in the effective projection area IAn with the selected shift amount. As described above, the effective projection area IAn is a deformed hexagon in which the substantially center corner portion CN is most widened.

  Therefore, by setting the actual projection region RAn by the composite trapezoidal correction having a shape obtained by synthesizing two trapezoids having the corner portion CN as the common upper base and the left and right sides of the rectangle as the lower base, the projector 10 For the user, an apparently correct projected image can be viewed.

  The initial setting process in FIG. 2 is completed as described above, and the process proceeds to an actual projection operation using an arbitrary input image.

  In the first embodiment, it has been described that the projection unit shifter 18 can shift the projection direction of the projection unit 17 in the vertical direction. However, the projection unit shifter 18 can shift not only in the vertical direction but also in the horizontal direction. A possible configuration is also conceivable.

  In that case, when the maximum shift amount in each of the left and right directions is, for example, ± 50 [%] or less (where one of the left and right is + and the other is-), a total of four shootings are performed together with the vertical shift Can cover the entire shift range. On the other hand, when both the upper and lower shift amounts and the left and right shift amounts exceed ± 50 [%], nine or more shootings are required to cover the entire shift range.

[Second operation example]
Next, a second operation example of the above embodiment will be described.
Here, the operation at the time of initial setting based on the tilt amount adjustment before the actual projection operation by the projector 10 is started will be described. At the time of initial setting, the tilt leg driver 29 extends and contracts the tilt leg of the projector 10 within a predetermined range to variably set the elevation angle (tilt angle) of the projection light emitted from the projection lens unit 16, and within the tilted range. A position where the most necessary color correction amount is small and an image can be projected without a sense of incongruity on the surface to be projected is selected.

  In the flowchart of FIG. 2, initially, the CPU 24 accepts an operation for setting the upper and lower limits of the tilt range by the tilt leg driver 29 by a key operation from the operation unit 27 (step S101).

In this case, the projection unit 17 projects an image that is entirely white based on the projection zoom angle of view set at that time. The user of the projector 10 projects in advance so as to avoid an obstacle such as an indoor unit of an air conditioner, for example, in the vicinity of the tilt upper limit position according to the situation of the surface to be projected. The projector 10 can recognize the upper limit value of the tilt range by performing an operation of increasing the tilt angle until the region reaches a position that does not touch the obstacle.
Note that the processing in step S101 may be omitted if unnecessary.

  Thereafter, the CPU 24 shoots the effective projection area by the photographing unit 23 within the tilt range by the tilt leg driver 29 as many times as necessary (step S102).

  FIG. 6 shows changes in the tilt angle and the projection area when the projector 10 is installed toward the upright wall surface WL.

  FIG. 6A illustrates a projection state at a tilt angle of 0 ° in which the leg length of the tilt leg of the projector 10 is minimized. As shown by the effective projection area IA11 and the projection optical axis PA1 at this time, the projection optical axis PA1 is offset upward with respect to the plane of the top plate of the housing of the projector 10, but it is effective in this state. The projection area IA11 is corrected by an optical system including the projection lens unit 16 so as to have a preset aspect ratio, for example, an accurate rectangle of 4: 3.

  With this offset setting, for example, even when the projector 10 is placed on the floor surface, the effective projection area IA11 can be set on the wall surface WL orthogonal to the floor plane.

  FIG. 6B illustrates a projection state at the maximum tilt angle X ° in which the tilt leg driver 29 is driven so that the tilt leg of the projector 10 becomes the longest. As shown by the effective projection area IA13 and the projection optical axis PA1 at this time, the entire projection area moves upward, and the projection distance from the projector 10 is longer than when the leg length of the tilt leg of the projector 10 is minimum. Therefore, the effective projection area IA13 is wider than the effective projection area IA11.

  In addition, by providing the tilt angle in this way, not only the projection position is raised and the area of the area is increased, but also the inverted trapezoidal shape in which the upper side of the projection area is longer than the lower side is obtained.

  FIG. 7 is a diagram illustrating an example of the position, message, and shape of the effective projection area corresponding to the tilt angle. In FIG. 6, the effective projection area IA11 when the tilt angle is 0 °, the effective projection area IA12 when the tilt angle is half “X / 2” °, and the maximum tilt angle shown in FIG. An effective projection area IA13 at X ° is shown.

  Returning to the flowchart of FIG. For example, it is assumed that the effective projection area is imaged by the imaging unit 23 at each of the three tilt angles. The CPU (control unit) 24 is a surface to be projected by processing such as comparison of histograms of RGB components in the captured image data based on the result of capturing a plurality of effective projection areas according to the tilt angle. As an area within which an image can be projected without a sense of incongruity, a tilt angle that is an effective projection area corresponding to an image with the smallest necessary color correction amount is selected (step S103).

  That is, the CPU 24 causes the photographing unit 23 to photograph the projection images in a plurality of projection directions that are varied within a predetermined range by the tilt leg driver (projection direction variable unit) 29, and based on the obtained information of the plurality of projection images. Then, the projection direction by the tilt leg driver (projection direction variable unit) 29 is determined.

  The CPU 24 performs driving by the tilt leg driver (projection direction variable unit) 29 to project an image at the selected tilt angle (step S104). Next, the CPU 24 calculates color correction information for each pixel so that the projection image in the effective projection area cancels the influence of the color or pattern of the wall surface or the like to be projected (step S105). Next, the calculated color correction information is set in the projection image driving unit 12 (step S106).

  Further, the CPU 24 sets digital correction such as automatic trapezoid correction including reduction of the range of the image displayed on the micromirror element 13, which is set in advance at that time (step S107).

  FIG. 8 is a diagram showing a comparison between the above-described effective projection areas for each of the three tilt angles and a rectangular actual projection area having a predetermined aspect ratio set by automatic trapezoid correction processing within the effective projection areas. is there. FIG. 8A illustrates the position, message, and shape of the effective projection area in accordance with the tilt angle, as in FIG. Since the effective projection area IA11 shown in FIG. 8B when the tilt angle is 0 ° is a rectangle with a correct aspect ratio, the entire area becomes the actual projection area as it is.

  The effective projection area IA12 in the case of the tilt angle “X / 2” ° shown in FIG. 8C has an inverted trapezoidal shape in which the upper part expands in accordance with the tilt angle. Therefore, if automatic trapezoidal correction is performed in accordance with the lower side to project a rectangle with the correct aspect ratio, an actual projection area slightly smaller in area than the effective projection area IA12 is obtained. It will be insufficient.

  The effective projection area IA13 in the case of the maximum tilt angle X ° shown in FIG. 8D has an inverted trapezoidal shape in which the upper part greatly expands according to the tilt angle. Therefore, if automatic trapezoidal correction is performed in accordance with the lower side to project a rectangle with the correct aspect ratio, the actual projection area is smaller in area than the effective projection area IA13, so that the resolution and brightness above the projected image are further insufficient. It will be.

  As described above, when the digital correction is set by automatic trapezoidal correction or the like, the initial setting process in FIG. 2 is finished and the process shifts to an actual projection operation using an arbitrary input image.

  Note that, as described above, as the tilt angle increases, the rate at which the resolution and brightness decrease due to digital correction processing such as automatic trapezoidal correction increases. The operation control may be performed so as to limit the range of the tilt angle by driving the tilt leg driver 29.

  FIG. 9 is a diagram showing a projection apparatus using an autonomous robot 10 ′ according to the second embodiment of the present invention. Unlike the projector 10 according to the first embodiment, the autonomous robot 10 ′ includes a rotation drive unit 36 as a projection direction variable unit that mechanically varies the direction of an image projected by the projection unit 17. . The autonomous robot 10 ′ includes a projection unit 17 as in the configuration of the projector 10. Furthermore, an infrared sensor 32 for detecting reflected infrared light for shape correction and a color sensor 33 for color correction are mounted. If only the shape correction is performed without performing the color correction, the color sensor 33 is unnecessary, and the unevenness of the projection surface can be recognized only by the infrared sensor 32.

  As the display element, a DLP method constituted by the micromirror element 13 or an LBS (laser beam scanning) method which is suitable for small size incorporation and does not require focus adjustment can be applied. Although there is no need to consider in the LBS system, in the case of the DLP, LCD (Liquid Crystal Display) or LCOS (Liquid Crystal On Silicon) system, when the main body of the autonomous robot 10 'is a movable projector, the projection lens unit 16 is always used. Since the distance between and the projection plane is not constant, it is necessary to measure the distance between the autonomous robot 10 'and the projection plane in order to automatically adjust the focus. For this reason, an infrared light irradiation unit and an infrared image sensor that receives infrared light reflected from the projection surface and converts the infrared light into an electrical signal to read necessary information are mounted.

  Next, an optimum focus position corresponding to the distance is processed by the image processing / calculation unit 34, and the focus position of the projection lens unit 16 is electrically controlled. The image processing / calculation unit 34 manages images and spatial information. An image is reproduced from an external input or an internal image generator, and the image is projected onto a desired projection plane through the autonomous robot 10 '(projection device). In the body of the autonomous robot 10 ′, a self-running drive unit 35 that can move around in a predetermined space, a rotation drive unit 36 that rotates upward with respect to the self-running drive unit 35, and a region having a projection unit 17 are vertically arranged. And an up-and-down driving unit that moves the angle up and down and rotates the angle up and down.

FIG. 10 shows an operation example 3 of the projection apparatus using the autonomous robot 10 ′. The autonomous robot 10 ′ performs projection from the projection unit 17 and photographing by the imaging unit 23 every time the rotation driving unit 36 rotates by a predetermined angle in order to obtain information on a 360 ° projection plane at a predetermined position. Perform and measure. For example, the projection angle of view is set to 50 ° in total, 25 ° left and right. In order to obtain 360 ° projection plane information from a specific point, the modules of the projection unit 17 and the imaging unit 23 are measured at least eight times.
50 ° × 8 times = 400 °> 360 °

  Specifically, a specific pattern such as a stripe pattern is irradiated from the projection unit 17 of the autonomous robot 10 ′, and the shape and color of the projection surface are calculated based on the reflected image characteristics. The obtained information is recorded in the autonomous robot 10 'as spatial information. The correction means is the same as in the previous operation example. If a 120 ° wide-angle lens is used as the projection lens unit 16, the entire surface of the 360 ° range can be recognized by performing projection and photographing three times, and an optimal projection surface can be found in a small number of times. It becomes.

  FIG. 11 is a diagram for automatically projecting an image by selecting an optimal projection plane from the obtained spatial image when actually projecting the image. When the region having the projection unit 17 of the autonomous robot 10 ′ is moved up and down by the vertical drive unit 37, vertical space information can be acquired. By coordinating with the movement amount of the projection unit 17 of the autonomous robot 10 ′, it is possible to link the optimal projection position. Furthermore, it recognizes the position of the viewer and the orientation of the face by using location information using Bluetooth (registered trademark), which is a short-range communication technology that performs face detection, heat detection, and communication with a nearby smartphone. It is possible to improve the attention effect and visibility. As described above, in the third operation example, by using the rotary drive unit 36 provided in the autonomous robot 10 ′ with the characteristics of the projection plane in advance, the entire circumference of 360 ° can be measured with the minimum number of measurements. This makes it possible to detect an optimal projection area.

  As described above in detail, according to the present embodiment, it is possible to set an environment for projecting an image with the highest possible image quality in consideration of the influence of the surface to be projected.

  In the above-described embodiment, the case where the projection direction with the least amount of color correction is selected has been described. In addition to this, the reduction amount of the image area by the digital correction set at that time is also used for each projection direction. It is also possible to automatically select a projection direction that seems to be appropriate depending on what is selected as a projection mode that gives priority to image quality, brightness, and projection area size.

  Furthermore, in the above-described embodiment, the case where the automatic keystone correction is performed as the digital correction as described in the first and second operation examples has been described. With the shift / tilt of the projection direction, it is possible to reliably correct the case where the projection area is trapezoidal according to the angle in an environment where the image is projected obliquely without the projection optical axis being orthogonal to the projection target surface. Thus, a rectangular image area corresponding to the original aspect ratio of the projected image can be realized.

  In the above embodiment, the acquisition unit that acquires the image on the projection target projected by the projection unit 17 is the photographing unit 23 that captures the image on the projection target projected by the projection unit 17. The configuration is not limited to this. A personal computer in which an acquisition unit of the projector 10 directly acquires an image captured by an external imaging unit that captures an image of a projection target projected by the projection unit 17 via a wired or wireless communication medium or a storage medium. It may be any configuration of obtaining via

  In addition, although the said embodiment demonstrated the case where it applied to the projector of a DLP (registered trademark) (Digital Light Processing) system which used the semiconductor light emitting element as the light source, this invention limits the element of a light source, the system of a projector, etc. Instead, for example, the invention can be applied to a projector using a high-pressure mercury lamp as a light source and using a color liquid crystal panel.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, the embodiments may be implemented in combination as appropriate, and in that case, the combined effect can be obtained. Furthermore, the present invention includes various inventions, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent elements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the problem can be solved and an effect can be obtained, the configuration from which the constituent requirements are deleted can be extracted as an invention.

Hereinafter, the invention described in the scope of claims of the present application will be appended.
[Claim 1]
A projection unit for projecting an image;
A projection direction variable unit that mechanically varies the direction of the image projected by the projection unit;
An acquisition unit for acquiring an image of the projection target projected by the projection unit;
A control unit that determines a projection direction by the projection direction variable unit based on information of a plurality of projection images acquired by the acquisition unit;
A projection apparatus comprising:
[Claim 2]
The projection apparatus according to claim 1, wherein the control unit causes the acquisition unit to acquire projection images in a plurality of projection directions changed by the projection direction variable unit.
[Claim 3]
The acquisition unit is an imaging unit that captures an image of the projection target projected by the projection unit, or an image captured by an external imaging unit that captures an image of the projection target projected by the projection unit, The projection apparatus according to claim 1, wherein the projection apparatus is configured to acquire directly via a wired or wireless communication medium or storage medium, or acquire via a personal computer.
[Claim 4]
The projection direction variable unit is a projection unit shifter that shifts the projection direction of the projection unit with respect to the apparatus, or a tilt leg driver that varies the installation angle of the apparatus by changing the leg length of the apparatus. The projection device described.
[Claim 5]
5. The control unit according to claim 1, wherein the control unit sets the projection direction variable unit so that the determined projection direction is obtained, and corrects and sets at least one of an image area and color information projected by the projection unit. A projection apparatus according to any of the above.
[Claim 6]
The control unit calculates a projection direction in which at least one of the reduction amount of the image area and the color correction amount is the smallest from the plurality of acquired projection images, and determines the projection direction by the corresponding projection direction variable unit. The projection apparatus according to claim 5.
[Claim 7]
The projection apparatus according to claim 5, wherein the control unit corrects and sets an area of an image projected by the projection unit by trapezoidal correction processing.
[Claim 8]
An apparatus comprising: a projection unit that projects an image; a projection direction variable unit that mechanically varies a direction of an image projected by the projection unit; and an acquisition unit that acquires an image on a projection target projected by the projection unit. A projection method of
A projection method comprising a control step of determining a projection direction by the projection direction variable unit based on information of a plurality of projection images acquired by the acquisition unit.
[Claim 9]
A projection unit that projects an image, a projection direction variable unit that mechanically varies the direction of the image projected by the projection unit within a predetermined range, and an acquisition unit that acquires an image on the projection target projected by the projection unit A program executed by a computer built in a device comprising:
A program that functions as a control unit that determines a projection direction by the projection direction variable unit based on information of a plurality of projection images acquired by the acquisition unit.

DESCRIPTION OF SYMBOLS 10 ... Projector 11 ... Image input part 12 ... Projection image drive part 13 ... Micromirror element 14 ... Light source part 15 ... Mirror 16 ... Projection lens part 17 ... Projection part 18 ... Projection unit shifter 19 ... Shooting lens part 20 ... Imaging element 21 ... A / D converter 22 ... shooting image processing unit 23 ... shooting unit 24 ... CPU
25 ... Main memory 26 ... Program memory 27 ... Operation unit 28 ... Audio processing unit 29 ... Tilt leg driver 30 ... Speaker unit

Claims (9)

A projection unit for projecting an image;
A projection direction variable unit that mechanically varies the direction of the image projected by the projection unit;
An acquisition unit for acquiring an image of the projection target projected by the projection unit;
A control unit that determines a projection direction by the projection direction variable unit based on information of a plurality of projection images acquired by the acquisition unit;
A projection apparatus comprising:   The projection apparatus according to claim 1, wherein the control unit causes the acquisition unit to acquire projection images in a plurality of projection directions changed by the projection direction variable unit.   The acquisition unit is an imaging unit that captures an image of the projection target projected by the projection unit, or an image captured by an external imaging unit that captures an image of the projection target projected by the projection unit, The projection apparatus according to claim 1, wherein the projection apparatus is configured to acquire directly via a wired or wireless communication medium or storage medium, or acquire via a personal computer.   The projection direction variable unit is a projection unit shifter that shifts the projection direction of the projection unit with respect to the apparatus, or a tilt leg driver that varies the installation angle of the apparatus by changing the leg length of the apparatus. The projection device described.   5. The control unit according to claim 1, wherein the control unit sets the projection direction variable unit so that the determined projection direction is obtained, and corrects and sets at least one of an image area and color information projected by the projection unit. A projection apparatus according to any one of the above.   The control unit calculates a projection direction in which at least one of the reduction amount of the image area and the color correction amount is the smallest from the plurality of acquired projection images, and determines the projection direction by the corresponding projection direction variable unit. The projection apparatus according to claim 5.   The projection apparatus according to claim 5, wherein the control unit corrects and sets an area of an image projected by the projection unit by trapezoidal correction processing. An apparatus comprising: a projection unit that projects an image; a projection direction variable unit that mechanically varies a direction of an image projected by the projection unit; and an acquisition unit that acquires an image on a projection target projected by the projection unit. A projection method of
A projection method comprising a control step of determining a projection direction by the projection direction variable unit based on information of a plurality of projection images acquired by the acquisition unit. A projection unit that projects an image, a projection direction variable unit that mechanically varies the direction of the image projected by the projection unit within a predetermined range, and an acquisition unit that acquires an image on the projection target projected by the projection unit A program executed by a computer built in a device comprising:
A program that functions as a control unit that determines a projection direction by the projection direction variable unit based on information of a plurality of projection images acquired by the acquisition unit.