JP2009260531A - Projector and projection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector for projecting a projection image to a projection region having a plurality of different angles in an optimum state. <P>SOLUTION: The projector includes: a display section 22 for displaying the projection image stored in an image storage section 16 and an index 36 for alignment at a position in a lateral direction of the projection image; a projection section 14 for reading the projection image and the index displayed on the display section by light from a light source 18 for projection; instruction sections 10, 12 for instructing trapezoid correction to the projection image; and an image processing section 26 for performing the trapezoid correction to each projection image displayed on the display section with the index as a boundary when the instruction sections instruct the trapezoid correction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a portable projector and a projection system having the projector.

A projector that projects an image onto a screen having two different angles is known (see, for example, Patent Document 1). In this projector, the projection image is subjected to trapezoidal correction, and the projection image is projected onto two screens facing different directions by using a reflecting mirror provided in the projector to obtain a projection direction that matches the tilt angle of the screen. Yes.
JP 2006-47890 A

  However, the projector described above is provided in an image display device to which the projector is attached and can project onto a screen having a substantially fixed tilt angle. However, the projector has various tilt angles other than the predetermined screen. Projection onto a surface is difficult.

  An object of the present invention is to provide a projector and a projection system that project a projection image in an appropriate state onto a plurality of projection areas having different angles.

  The projector according to the present invention includes a display unit that displays a projection image stored in the image storage unit and an index for alignment at any position in the horizontal direction of the projection image, and the projection displayed on the display unit. A projection unit for projecting the image and the index with light from a light source, an instruction unit for instructing trapezoid correction for the projection image, and when the instruction unit instructs the keystone correction, the index is used as a boundary. And an image processing unit that performs keystone correction on each of the projected images displayed on the display unit.

  The projector of the present invention includes a display unit that displays a projection image stored in an image storage unit, a projection unit that reads out the projection image displayed on the display unit by light from a light source, and subject light. The projection area is detected by the projection area detecting section that detects the projection area of the projection image by the projection section based on the captured image captured by the imaging section, and the projection area detection section. When it is detected that two planes having different angles with respect to the projection direction of the projection image are straddled, the projection area discrimination unit that discriminates the state of the projection area on each plane and the discrimination by the projection area discrimination unit And a projection control unit that controls projection of a projection image on each of the two surfaces based on the result.

  Further, the projection system of the present invention is a foldable screen having a screen index for alignment at the bent portion, a projection image stored in the image storage unit, and a position in any one of the horizontal directions of the projection image. A display unit that displays an image index for alignment with the screen index; a projection unit that displays the projection image displayed on the display unit and the image index by light from a light source; and a trapezoidal correction for the projection image And an image processing unit that performs keystone correction on each of the projection images displayed on the display unit having the index as a boundary when a keystone correction instruction is given by the instruction unit. It is characterized by providing.

  Further, the projection system of the present invention is a foldable screen having a screen index for alignment at the bent portion, a display portion for displaying a projected image stored in the image storage portion, and a display portion displayed on the display portion. The projection unit that projects the projected image with light from the read light source, the imaging unit that captures the subject light, and the projection by the projection unit based on the screen index included in the captured image captured by the imaging unit. When it is detected by the projection region detection unit that detects the projection region of the image and the projection region detection unit that the projection region straddles a plurality of surfaces having different angles with respect to the projection direction of the projection image A projection area determining unit that determines the state of the projection area on each surface, and the respective surfaces based on the determination result by the projection area determining unit. It characterized in that it comprises a projector and a projection control unit that controls the projection of the projection image against.

  According to the projector of the present invention, it is possible to project a projection image onto projection areas having two different angles. For example, the projection image can be projected across two wall surfaces in a corner of a room.

  Further, according to the projection system of the present invention, a projector and a self-supporting screen are provided, and projection can be easily performed without selecting a place.

  A projector according to a first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a system configuration of the projector according to the first embodiment. The projector 2 includes a CPU 4. The CPU 4 includes a power switch 6, a multi-selector 10 for selecting a projection mode, a keystone correction instruction, a determination button 12, a projection unit 14 for projecting a projection image, and an image for storing projection image data. The storage unit 16 and an image processing unit 26 that performs predetermined processing on the projection image are connected.

  The projection unit 14 is a power source control unit 20 that turns on and off the LED 18 that is a light source, an LCOS (reflection liquid crystal element) 22 that reads out image data of a projection image from the image storage unit 16 and displays a projection image, and a display control of the LCOS 22. The display control part 24 which performs is provided.

  FIG. 2 is a diagram illustrating a configuration of the projection unit according to the embodiment. The projection unit 14 is an LED 18 that is a light source for image projection, a condensing lens 28 for making the light emitted from the LED 18 substantially parallel, and separates the incident light into P-polarized component light and S-polarized component light. A polarizing beam splitter 30, an LCOS 22 for displaying the projection image, and a projection lens 32 for projecting the projection image. Note that the left surface 30a in FIG. 2 of the polarization beam splitter 30 is subjected to non-reflection processing such as black processing.

  In the projection unit 14, the light emitted from the LED 18 is made substantially parallel light by the condenser lens 28, and the light made substantially parallel light is incident on the polarization beam splitter 30. Of the light incident on the polarizing beam splitter 30, the S-polarized component light is reflected to the left in FIG. 2 and travels toward the non-reflecting surface 30a of the polarizing beam splitter 30, while the P-polarized component light is The light passes through the polarization beam splitter 30. The P-polarized component light transmitted through the polarization beam splitter 30 enters the LCOS 22. The P-polarized component light incident on the LCOS 22 travels through the liquid crystal layer of the LCOS 22 and is reflected by a reflective film (not shown), and then travels in the reverse direction through the liquid crystal layer of the LCOS 22 and is emitted from the LCOS 22. The light emitted from the LCOS 22 enters the polarization beam splitter 30 again. When a voltage is applied, the liquid crystal layer of the LCOS 22 functions as a phase plate, and converts P-polarized component light into S-polarized component light. Therefore, the light incident on the polarization beam splitter 30 is a mixed light of the S polarization component and the P polarization component. The polarization beam splitter 30 reflects only the S-polarized light component of the re-incident light, and the reflected S-polarized light component is projected from the projector projection window 34 to the front of the projector 2 via the projection lens 32. The In other words, the image displayed on the LCOS 22 is read out as a projection image and projected onto the projection area in front of the projector 2.

  Next, processing of the projector according to the first embodiment will be described with reference to the flowchart shown in FIG. When the power switch 6 is operated and the projector 2 is turned on to start projecting a projection image, single image projection is performed. That is, the CPU 4 projects one projection image read from the image storage unit 16 via the projection unit 14 and projects one projection image on a screen, a wall, or the like as shown in FIG. 4 (step S1). . When the multi-selector 10 and the decision button 12 are operated and the two-image projection mode is selected (step S2), the CPU 4 stores the image data of the vertical image having a vertically long shape in the image data stored in the image storage unit 16. It is determined whether it is included (step S3). When it is determined that the image data of the vertical image is stored in the image storage unit 16, the vertical image is preferentially selected, and a boundary between the selected two vertical images and the two vertical images is selected. Is displayed on the LCOS 22 (step S4). Accordingly, as shown in FIG. 5, two vertical images and an index 36 are projected onto the projection area.

  If it is determined in step S3 that no image data of the vertical image is stored in the projection image stored in the image storage unit 16, the CPU 4 selects the image data of the horizontally long image. The two selected horizontal images and an index 36 as a boundary between the two horizontal images are displayed on the LCOS 22 (step S5). Accordingly, as shown in FIG. 6, two horizontal images and the index 36 are projected onto the projection area. In this case, the top and bottom of the two horizontal images are displayed as blank or black.

  Here, for example, the projection image shown in FIG. 5 is projected onto the projection area 38 having two different angles such as the corners of the room as shown in FIG. In this case, the image is projected in a distorted state shown in FIG. In this state, when a keystone correction instruction is issued by operating the multi-selector 10 and the decision button 12 (step S6), the image processing unit 26 performs keystone correction on the left and right projected vertical images (step S6). S7). That is, when projected onto the projection area 42, which is the plane shown in FIG. 9, the keystone correction is performed on each projection image so that the projection image is projected in the state shown in FIG. The projected image is displayed on the LCOS 22. Therefore, when the projection image subjected to the trapezoidal correction is projected onto the projection region 38 having two different angles, the boundary 40 between the projected index 36 and the projection region 38 having two different angles. By manually aligning the positions of and, the projection image projected on the projection area 38 having two different angles becomes the projection state shown in FIG. Note that the keystone correction in the present embodiment assumes that the image is projected onto the corner of the room, etc., and the keystone correction is performed by the correction amount for performing projection on a plane inclined by 45 degrees with respect to the projection direction of the projection image I do.

  In addition, when there is one vertical image stored in the image storage unit 16 in step S3, the vertical image and the horizontal image may be displayed one by one as shown in FIG. At this time, a ladder 44 may be displayed as a boundary between the vertical image and the horizontal image. Further, when there is no vertical image stored in the image storage unit 16, four horizontal images can be projected as shown in FIG. At this time, a ladder 44 as a boundary may be displayed between the two horizontal images displayed on the left and right. Here, FIGS. 11 and 12 show a state in which trapezoidal correction is performed on the projected images projected to the left and right of the ladder 44, respectively.

  Further, when the single image projection is performed on the surfaces having two different angles in step S1, the index 36 is displayed at any position in the horizontal direction of the single image, and the index 36 is used as a boundary to the left and right respectively. It is also possible to perform trapezoidal correction corresponding to the inclination angle of the projection plane. At this time, by manually aligning the position of the index 36 and the boundary 40 of the surface having two different angles, the projection image is projected onto the surface having two different angles even in the single image projection. be able to.

  According to the projector according to the first embodiment, it is possible to project a projection image on projection areas having two different angles, for example, projecting different projection images on each surface having different angles such as a corner of a room. can do.

  Next, a projector according to a second embodiment of the invention will be described with reference to the drawings. The configuration of the projector according to the second embodiment is obtained by adding an imaging unit to the projector 2 according to the first embodiment. Therefore, a detailed description of the same configuration as that of the first embodiment is omitted, and only different portions will be described in detail. Further, the same components as those in the first embodiment will be described with the same reference numerals.

  FIG. 13 is a block diagram showing a system configuration of the projector according to the second embodiment. In addition to the system configuration of the projector according to the first embodiment, an image pickup unit 48 including an image pickup device for picking up an image of a projection area by the projection unit 14 is connected to the CPU 4 of the projector 46.

  Next, processing of the projector according to the second embodiment will be described with reference to the flowchart shown in FIG. When the power switch 6 is operated and the projector 46 is turned on to start projecting a projection image, single image projection is performed. That is, the CPU 4 projects one projection image read from the image storage unit 16 via the projection unit 14, and projects one projection image on a screen, a wall or the like as shown in FIG. 4 (step S11). . Next, the CPU 4 determines whether or not the projection area extends over two planes having different angles from the captured image of the projection area by the imaging unit 48 (step S12). That is, when the projected image is projected on one plane as shown in FIG. 9, the projected image projected on the projection area becomes a quadrangle as shown in FIG. 4, and straddles two planes as shown in FIG. When projected, the projected image breaks at the boundary between two planes with different angles, so that the projected image projected onto the projection area is a hexagon as shown in FIG. Therefore, it is determined from the shape of the projection area imaged by the imaging unit 48 whether or not the projection area straddles two planes having different angles.

  If it is determined in step S12 that the projection image is projected on one plane, the single image projection is continued (step S11). On the other hand, if it is determined that the image is projected onto two planes, it is determined whether or not two images can be projected (step S13). That is, when the projected image is projected almost evenly on each of two planes having different angles constituting the projection area 38 shown in FIG. When it is determined that the image can be projected, and when the size of each surface of the projection image divided by the boundary 40 illustrated in FIG. 7 has a predetermined deviation or more, it is determined that the two images cannot be projected. At this time, in the captured image obtained by imaging the projection area, it is determined that the two images cannot be projected when the ratio of the larger one of the projection areas divided by the boundary 40 between the two planes is 70 to 80% or more. To do.

  If it is determined that two images can be projected (step S13), the second image is read from the image storage unit 16 (step S14), and the projection image projected in step S11 and step S14 are read. Each of the read projection images is subjected to trapezoidal correction by the image processing unit 26 (step S15), and one projected image on each of the left and right sides with a portion projected on the boundary 40 between the two planes on the LCOS 22 as a boundary. Is displayed (step S16). That is, when projected onto the projection area 42 which is a flat surface, a projection image obtained by performing trapezoidal correction on each projection image is displayed on the LCOS 22 so as to be projected in the state shown in FIG. . Accordingly, when the projection image subjected to the trapezoidal correction is projected onto the projection area 38 having two different angles, the projection state shown in FIG. 5 is obtained.

  On the other hand, when it is determined that the two images cannot be projected (step S13), the image processing unit 26 performs trapezoid correction on the projection image projected in step S11 (step S17), and the boundary 40 between the two planes. Of the planes divided by the above, the projection image is displayed on the LCOS 22 so as to be projected on the side with the larger projection area, and the smaller side is set to blank display or black display (step S18). At this time, when projected onto the projection area 42 which is a plane, a projection image obtained by performing trapezoidal correction on the projection image is displayed on the LCOS 22 so as to be projected in the state shown in FIG. Therefore, when the projection image subjected to the trapezoidal correction is projected onto the projection area 38 having two planes with different angles, the projection state shown in FIG. 17 is obtained. In FIG. 17, the right side of the index 36 is blank or black, but information regarding projection images such as imaging conditions, imaging date and time, thumbnail display of other projection images, and the like may be performed.

  The trapezoidal correction according to the present embodiment is performed on the projection image by determining a correction value based on the shape of the projection region detected from the captured image.

  In the case of projecting onto surfaces having two different angles, when it is determined that one of the surfaces is inclined at a predetermined angle or more with respect to the projection direction of the projection image of the projector 46, the projection direction is The surface determined to be inclined by a predetermined angle or more may be displayed in blank or black.

  According to the projector according to the second embodiment, it is possible to project a projection image onto projection areas having two different angles, for example, projecting different projection images onto surfaces having different angles such as a corner of a room. be able to.

  Next, a projection system according to a third embodiment of the invention will be described with reference to the drawings. Note that the configuration of the projector used in the projection system according to the third embodiment is the same as that of the projector 46 according to the second embodiment. Therefore, a detailed description of the same configuration as that of the second embodiment is omitted, and only different portions will be described in detail. Further, the same components as those in the second embodiment will be described with the same reference numerals.

  FIG. 18 is a diagram illustrating a configuration of a projection system according to the third embodiment. The projection system 56 includes a projector 46 and a foldable screen 58. As shown in FIG. 18, the screen 58 constituting the projection system 56 is a foldable screen, and has a mark 60 for alignment at each bent portion of the screen. Since this screen 58 has a folding screen-like bent portion, it can stand on a desk or the like.

  Next, processing of the projector 46 of the projection system according to the third embodiment will be described with reference to the flowchart shown in FIG. When the multi-selector 10 and the decision button 12 are operated and projection onto the folding screen 58 is selected (step S21), the imaging unit 48 images the screen 58 and detects the position of the mark 60 on the screen 58. (Step S22). The CPU 4 detects the size of each surface constituting the screen 58 and the inclination of the projection image with respect to the projection direction from the detected mark position. Next, the CPU 4 reads one projection image from the image storage unit 16 (step S23), divides the projection image into regions projected on the respective surfaces of the screen 58, and detects the size of each surface of the detected screen and Each of the projected images divided based on the tilt is subjected to trapezoidal correction (step S24) and displayed on the LCOS 22 (step S25). Then, a projected image is projected as shown in FIG.

  Note that a plurality of projection images may be read out from the image storage unit 16 in step S23, and a single projection image may be projected onto one surface of the screen 58. In this case, the size of each surface of the screen 58 and the inclination of the projection image with respect to the projection direction are detected from the position of the mark detected based on the captured image captured in step S22, and the screen 58 is the same as in steps S24 to S25. Each of the projected images projected onto the respective surfaces is subjected to trapezoidal correction and displayed on the LCOS 22. Then, a projected image is projected as shown in FIG.

  In the third embodiment described above, the projector 46 is used, but the projector 2 can also be used. In this case, the projector 2 stores the shape of the screen 58 such as the size of the surface when the folding screen 58 is opened and the angle between adjacent surfaces, and the screen 58 The image is divided into projection images projected on the respective surfaces, and the divided projection images are subjected to trapezoidal correction and displayed on the LCOS 22. Further, the LCOS 22 displays and projects an alignment index together with the projection image, and manually aligns the index and the bent portion of the screen.

  Further, even when performing the above-described multi-screen projection, it is possible to read out projection images projected on the respective surfaces of the screen 58, perform trapezoidal correction, display them on the LCOS 22 together with indices, and project them onto the screen 58. Also in this case, the alignment between the index and the bent portion of the screen is easily performed manually.

  According to the projection system according to the third embodiment, a small and portable projector and a folding screen are provided, and the screen can be made independent on a desk or the like, even when there is no appropriate projection area such as a wall. Projection images can be easily projected without selecting a place.

  Although the horizontal keystone correction has been described in each of the above-described embodiments, a horizontal sensor is provided in the projector, and the correction amount is determined by detecting the vertical projection angle to perform the vertical keystone correction. Also good.

1 is a block diagram showing a system configuration of a projector according to a first embodiment of the present invention. It is a figure which shows the structure of the projection part which concerns on embodiment of this invention. It is a flowchart which shows the process of the projector which concerns on the 1st Embodiment of this invention. It is a figure which shows the projection image projected by the projector which concerns on embodiment of this invention. It is a figure which shows the projection image projected by the projector which concerns on embodiment of this invention. It is a figure which shows the projection image projected by the projector which concerns on the 1st Embodiment of this invention. It is a figure which shows the projector and projection area | region which concern on embodiment of this invention. It is a figure which shows the projection image projected by the projector which concerns on the 1st Embodiment of this invention. It is a figure which shows the projector and projection area | region which concern on embodiment of this invention. It is a figure which shows the projection image projected by the projector which concerns on the 1st Embodiment of this invention. It is a figure which shows the projection image projected by the projector which concerns on the 1st Embodiment of this invention. It is a figure which shows the projection image projected by the projector which concerns on the 1st Embodiment of this invention. 1 is a block diagram showing a system configuration of a projector according to an embodiment of the present invention. It is a flowchart which shows the process of the projector which concerns on the 2nd Embodiment of this invention. It is a figure which shows the projection image projected by the projector which concerns on the 2nd Embodiment of this invention. It is a figure which shows the projection image projected by the projector which concerns on the 2nd Embodiment of this invention. It is a figure which shows the projection image projected by the projector which concerns on the 2nd Embodiment of this invention. It is a figure which shows the structure of the projection system which concerns on the 3rd Embodiment of this invention. It is a flowchart which shows the process of the projector which concerns on the 3rd Embodiment of this invention. It is a figure which shows the screen on which the projection image was projected by the projector which concerns on the 3rd Embodiment of this invention. It is a figure which shows the screen on which the projection image was projected by the projector which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

2 ... projector, 4 ... CPU, 14 ... projection unit, 18 ... LED, 22 ... LCOS, 30 ... polarization beam splitter, 32 ... projection lens, 36 ... index, 48 ... imaging unit, 58 ... screen.

Claims (9)

A display unit that displays a projected image stored in the image storage unit and an index for alignment at any position in the horizontal direction of the projected image;
A projection unit that reads out the projection image and the index displayed on the display unit and projects the light by light from a light source;
An instruction unit for instructing keystone correction for the projection image;
An image processing unit that performs keystone correction on each of the projection images displayed on the display unit having the index as a boundary when a keystone correction instruction is given by the instruction unit.   When displaying the different projected images with the index as a boundary in the display unit, the vertical image is preferentially selected and displayed from among the plurality of projected images stored in the image storage unit. The projector according to claim 1. A display unit for displaying the projection image stored in the image storage unit;
A projection unit that reads the projection image displayed on the display unit and projects the projection image with light from a light source;
An imaging unit for imaging subject light;
A projection region detection unit that detects a projection region of the projection image by the projection unit based on a captured image captured by the imaging unit;
When the projection area detection unit detects that the projection area straddles two surfaces having different angles with respect to the projection direction of the projection image, the projection for determining the state of the projection area on each surface An area discriminator;
A projector comprising: a projection control unit that controls projection of a projection image onto each of the two surfaces based on a determination result by the projection region determination unit.   The projection control unit performs trapezoidal correction on each of the projection images displayed on the display unit for each projection image projected on each surface determined by the projection region determination unit. 3. The projector according to 3.   5. The projector according to claim 3, wherein the projection control unit projects the different projection images stored in the projection image storage unit onto the respective surfaces determined by the projection area determination unit. .   When the projection area determination unit determines that the ratio of the other surface to one surface is equal to or less than a predetermined value for the state of the projection region of each surface, the projection control unit The projector according to any one of claims 3 to 5, wherein the projection image is projected only on the other side, and the projection image is not projected on the other surface.   When the projection area determination unit determines that any one of the surfaces is inclined at a predetermined angle or more with respect to the projection direction of the projection image, the projection control unit includes: The projector according to any one of claims 3 to 6, wherein the projection image is not projected onto a surface that is determined to be inclined at a predetermined angle or more. A screen that is foldable and has a screen index for alignment in the bent portion;
A display unit that displays a projected image stored in the image storage unit and an image index for alignment with the screen index at any position in the horizontal direction of the projected image;
A projection unit that reads the projection image and the image index displayed on the display unit, and projects the projection image with light from a light source;
An instruction unit for instructing keystone correction for the projection image;
A projector including an image processing unit that performs keystone correction on each of the projection images displayed on the display unit having the index as a boundary when a keystone correction is instructed by the instruction unit. Projection system. A screen that is foldable and has a screen index for alignment in the bent portion;
A display unit for displaying the projection image stored in the image storage unit;
A projection unit that reads the projection image displayed on the display unit and projects the projection image with light from a light source;
An imaging unit for imaging subject light;
A projection area detection unit that detects a projection area of the projection image by the projection unit based on the screen index included in the captured image captured by the imaging unit;
When the projection area detection unit detects that the projection area straddles a plurality of surfaces having different angles with respect to the projection direction of the projection image, the projection for determining the state of the projection area on each surface An area discriminator;
A projection system comprising: a projector including a projection control unit that controls projection of a projection image on each surface based on a determination result by the projection region determination unit.

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