JP2014187530A - Projection device, image output device, projection method, and projection program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection device capable of improving the degree of freedom at distortion correction.SOLUTION: A CPU 19 acquires a relative angle between a projector 1 and a screen 2 by, for example, an attitude sensor 23, and based on the acquired relative angle, calculates the number of output pixels to be recommended to a PC 4 to notify the PC 4 of the number of output pixels. The CPU 19 then performs the distortion correction and the projection of an image signal output from the PC 4 according to the notified number of output pixels, on the basis of the relative angle.

Description

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

  In general, a projector is known as an image projection apparatus that projects an image based on image data output from an image output apparatus such as a personal computer (PC) onto a projection object such as a screen.

  If the optical axis of the projection light of the projector is perpendicular to the projection surface of the projection object such as a screen, the projected image is not distorted. However, if the optical axis is not perpendicular to the projection plane due to the installation angle of the projector, the image is distorted.

  For this reason, as disclosed in Patent Document 1, for example, a correction function for correcting image distortion, generally referred to as a trapezoidal correction function, is incorporated in a projector. This distortion correction function corrects the distortion of the projected image based on the vertical angle (vertical angle) and the horizontal angle (horizontal angle) of the optical axis obtained with a predetermined method. .

  The principle of this distortion correction will be described with reference to FIG. Here, v and h are used as the angle parameters, respectively. The angle v is an angle in the vertical direction of the projector 1 with respect to the ground plane, and the angle h is an angle (direction) in the horizontal direction of the projector 1. It is assumed that the projection target (screen 2) is perpendicular to the ground plane. The horizontal base 3 is a platform parallel to the ground plane. The x-axis, y-axis, and z-axis represent the projector coordinate system, and the z-axis coincides with the optical axis of the projector optical system.

  FIG. 16 is a detailed view showing the relationship between the projector coordinate system of FIG. 15 and the two angles h and v in this case. The three solid arrows in FIG. 16A are the projector coordinate system. First, the y-axis is used as a rotation axis, and the first axis is rotated in the horizontal direction by an angle h which is the first angle. As a result, the z-axis and the x-axis each move to a dotted arrow. The three solid arrows in FIG. 16B are the projector coordinate system after being rotated by an angle h in this horizontal complementary direction. Next, with the x axis as the rotation axis, the second axis is rotated in the vertical direction by an angle v that is a second angle. As a result, the z-axis and the y-axis each move to a dotted arrow. The three arrows in FIG. 16C represent the projector coordinate system after first being rotated by an angle h in the horizontal direction and then rotated by an angle v in the vertical direction. At this time, the x-axis is parallel to the horizontal base 3.

  As described above, the z-axis direction, that is, the optical axis direction (projection direction) of the projector optical system can be freely changed by the angles h and v.

  Then, when the projector 1 is installed as shown in FIG. 15, the projected image that should be displayed in a rectangular shape is displayed in a distorted rectangle on the screen 2 as shown as a pre-correction distorted rectangle abcd. Become. FIG. 15 shows a state in which the z-axis of the projector 1 is first swung to the right by the angle h = 30 ° in the horizontal direction and then swung upward by the angle v = 30 ° in the vertical direction. .

  In the distortion correction, a corrected rectangle a′b′c′d ′ shown as a white rectangle is set inside the uncorrected distortion rectangle abcd, and the input image information is changed to the corrected rectangle a′b′c′d ′. This is a projective transformation technique.

  FIG. 17 is a diagram showing the relationship between the distortion-corrected pre-correction rectangle and the post-correction rectangle of the projector 1 as seen on the projection plane. FIG. 18 shows the same relationship with the output display element ( It is a figure which shows the case where it sees on the surface of a micromirror display element, a liquid crystal element, etc.

  In FIG. 17, a white rectangle is a corrected rectangle a′b′c′d ′, which is an image effective portion. The hatched portion is the remaining image invalid portion obtained by cutting out the corrected rectangle a′b′c′d ′ from the pre-correction distorted rectangle abcd. A point k represents a position where the optical axis of the projector optical system passes through the projection plane.

  The hatched portion and white square in FIG. 18 correspond to the hatched portion and white rectangle in FIG. 17, respectively. The percentage display in the white square represents the pixel utilization rate of the output display element. The central square with h = v = 0 represents the case without distortion correction, and at this time, the pixel utilization rate is 100%.

  Although there are a plurality of distortion correction clipping methods, FIGS. 17 and 18 are examples in which a clipping method that improves the pixel utilization rate while maintaining the aspect ratio of the image is employed.

  Further, the specifications of the projector are as follows. The aspect ratio of the output display element is 16: 9 (about 1.78), the slow ratio is about 0.92, and the optical axis position of the output display element is about the height of the output display element from the center of the lower side. 20% above. However, slow ratio = projected image width / projection distance, and the condition of the slow ratio is when there is no distortion correction.

JP 2001-339671 A

  By the way, when outputting an image of a PC as an image output device, particularly a screen such as Windows (registered trademark), the aspect ratio (number of output pixels) on the PC side has a degree of freedom. It is possible to freely change the aspect ratio while Windows is in operation. For example, the aspect ratio is 1.333 (800 × 600 pixels), the aspect ratio is 1.600 (1280 × 800 pixels or 1680 × 1050 pixels), the aspect ratio is 1.778 (1600 × 900 pixels), and so on. In other words, the screen need only be a rectangle.

  The projector 1 is configured to project an image with a plurality of aspect ratios by selectively using an output display element according to the aspect ratio of the output image of the PC. As described above, even when the aspect ratio of the image input to the projector 1 is switched, the distortion correction maintains the aspect ratio of the original image, that is, the aspect ratio without distortion correction.

  Therefore, the degree of freedom at the time of distortion correction was not so large.

  It is an object of the present invention to provide a projection device, an image output device, a projection method, and a projection program that can improve the degree of freedom during distortion correction.

  In order to achieve the above object, according to an aspect of the present invention, a projection apparatus is a projection apparatus that receives an image signal output from an image output apparatus and projects the image signal onto a projection target. An acquisition unit that acquires a relative angle with the projector, a recommended pixel number calculation unit that calculates the number of output pixels recommended for the image output device based on the acquired relative angle, and the calculated number of output pixels Notification means for notifying the image output device, and distortion correction for projecting the image signal output from the image output device according to the notified number of output pixels by correcting the distortion based on the relative angle Means.

  In order to achieve the above object, according to one aspect of the present invention, an image output apparatus is an image output apparatus that cooperates with a projection apparatus that projects an output image signal onto a projection target, the projection apparatus and the target Acquisition means for acquiring relative angle with the projection body and angle of view information at the time of projection, and the recommended number of output pixels of the image signal to be output when correcting distortion based on the acquired relative angle and angle of view information The recommended pixel number calculating means for calculating the distortion, the distortion correcting means for correcting the distortion of the image signal to be output based on the relative angle and the angle-of-view information, and the image whose distortion is corrected by the calculated recommended number of output pixels Output means for outputting a signal to the projection apparatus.

  In order to achieve the above object, according to one aspect of the present invention, a projection method is a projection method in a projection apparatus that inputs an image signal output from an image output apparatus and projects the image signal onto a projection target, the projection apparatus And a relative angle acquisition step of acquiring a relative angle between the projection target and the recommended number of pixels for calculating the number of output pixels recommended for the image output device based on the relative angle acquired by the relative angle acquisition step A calculation step, a notification step of notifying the image output device of the number of output pixels calculated in the recommended pixel number calculation step, and an image output from the image output device in accordance with the notified number of output pixels A distortion correction step of correcting and projecting the signal based on the relative angle acquired by the relative angle acquisition step.

  In order to achieve the above object, according to one aspect of the present invention, a projection program receives, on a computer in a projection apparatus that inputs an image signal output from an image output apparatus and projects the image signal on the projection target, the projection apparatus and the subject. Obtaining a relative angle with the projector, calculating a recommended number of output pixels for the image output device based on the obtained relative angle, and calculating the calculated output pixel number to the image output device. And the image signal output from the image output device according to the notified number of output pixels is subjected to distortion correction based on the relative angle and projected.

  According to the present invention, it is possible to provide a projection device, an image output device, a projection method, and a projection program that can improve the degree of freedom during distortion correction.

(A) is a figure which shows the relationship between the projector which concerns on 1st Embodiment of this invention, and the personal computer which concerns on 1st Embodiment of this invention, (B) is a block diagram which shows the structural example of a projector. is there. (A) is a figure which shows the flowchart showing an example of operation | movement on the projector side in 1st Embodiment, (B) is a figure which shows the flowchart showing an example of operation | movement by the side of a personal computer similarly. It is a figure which shows the case where the relationship between the distortion rectangle before correction | amendment of the distortion correction in the projector of 1st Embodiment, and the rectangle after correction | amendment is seen on the projection surface. It is a figure which shows the case where the relationship between the distortion rectangle before correction | amendment of the distortion correction of a projector and the rectangle after correction | amendment in the projector of 1st Embodiment is seen on the surface of an output display element. (A) is a figure which shows the flowchart showing an example of operation | movement by the side of the projector in the modification of 1st Embodiment, (B) is a figure which shows the flowchart showing an example of operation | movement by the side of a personal computer similarly. It is a figure which shows the structure of the electric leg part of the projector which concerns on 2nd Embodiment of this invention. FIG. 16 is a diagram illustrating a case where a roll angle r is rotated about the z axis as a rotation axis after the state of FIG. 15. FIG. 8 is a detailed diagram showing the relationship between the projector coordinate system of FIG. 7 and three angles h, v, and r. It is a figure which shows the flowchart showing an example of the operation | movement by the side of the projector in 2nd Embodiment. It is a figure which shows the case where the relationship between the distortion rectangle before correction | amendment of the distortion correction in the projector of 2nd Embodiment, and the rectangle after correction | amendment is seen on the projection surface. It is a figure which shows the case where the relationship between the distortion rectangle before correction | amendment of the distortion correction of a projector and the rectangle after correction | amendment in the projector of 2nd Embodiment is seen on the output display element surface. (A) is a figure which shows the flowchart showing an example of operation | movement by the side of the projector in the modification 1 of 2nd Embodiment, (B) is a figure which shows the flowchart showing an example of operation | movement by the side of a personal computer similarly. . It is a figure which shows the example of the roll angle change mechanism in the modification 2 of 2nd Embodiment of this invention. It is a figure which shows the example of the optimal roll angle look-up table. It is a perspective view showing the relationship between a projector and a to-be-projected body (screen) in the case of h = v = 30 degrees. FIG. 16 is a detailed diagram showing a relationship between the projector coordinate system of FIG. 15 and two angles h and v. It is a figure which shows the case where the relationship between the distortion rectangle before correction | amendment of the distortion correction of a projector and the rectangle after correction | amendment is seen on the projection surface. It is a figure which shows the case where the relationship between the distortion rectangle before correction | amendment of the distortion correction of a projector, and the rectangle after correction | amendment is seen on the output display element surface.

[First Embodiment]
A first embodiment will be described with reference to the drawings. The projection apparatus according to the present embodiment uses a digital light processing (DLP) (registered trademark) system using a micromirror display element as an output display element. As shown in FIG. 1A, a projector 1 as a projection apparatus according to this embodiment is connected to a personal computer (PC) 4 as an image output apparatus according to this embodiment, and receives an output image of the PC 4. Thus, it is projected and displayed on the screen 2.

  A schematic configuration of the projector 1 is shown in FIG. The projector 1 includes an input / output connector unit 11, an input / output interface (I / F) 12, an image conversion unit 13, a projection processing unit 14, a micromirror element 15, a light source unit 16, a mirror 17, and a projection. Lens 18, CPU 19, main memory 20, program memory 21, operation unit 22, posture sensor 23, sound processing unit 24, speaker 25, lens adjustment unit 26, posture adjustment unit 27, electric motor It has a leg portion 28 and a system bus SB.

  The input / output connector unit 11 is provided with terminals such as a pin jack (RCA) type video input terminal and a D-sub 15 type RGB input terminal, for example, and an analog image signal is input thereto. The input image signal is input to the image conversion unit 13 via the input / output I / F 12 and the system bus SB. Input analog image signals of various standards are converted into digital image signals. The input / output connector unit 11 may be provided with, for example, an HDMI (registered trademark) terminal and the like so that not only an analog image signal but also a digital image signal can be input. Furthermore, it is also possible to output various types of information in a data format standardized as Extended Display Identification Data (EDID). In addition, an audio signal based on an analog or digital signal is input to the input / output connector unit 11. The input audio signal is input to the audio processing unit 24 via the input / output I / F 12 and the system bus SB. Further, the input / output connector unit 11 is also provided with, for example, an RS232C terminal and a USB terminal so that data can be exchanged with the PC 4 via them.

  The image conversion unit 13 is also referred to as a scaler. The image conversion unit 13 performs conversion for adjusting the number of resolutions, the number of gradations, and the like for the input image data, and generates image data in a predetermined format suitable for projection. The image conversion unit 13 transmits the converted image data to the projection processing unit 14. If necessary, the image conversion unit 13 transmits image data on which symbols indicating various operation states for On Screen Display (OSD) are superimposed to the projection processing unit 14 as processed image data. In addition, the image conversion unit 13 performs a geometric correction of the projection image as necessary, and performs a distortion correction process so that the image is projected in an appropriate shape on a projection object such as a screen according to the projection state. To do.

  The light source unit 16 emits light of a plurality of colors including primary color lights of red (R), green (G), and blue (B). Here, the light source unit 16 is configured to sequentially emit a plurality of colors in a time division manner. The light emitted from the light source unit 16 is totally reflected by the mirror 17 and enters the micromirror element 15.

  The micromirror element 15 has a plurality of micromirrors arranged in an array. Each micromirror is turned on / off at high speed to reflect the light emitted from the light source unit 16 toward the projection lens 18 or to deflect it from the direction of the projection lens 18. In the micromirror element 15, micromirrors are arranged for 1600 horizontal pixels × 900 vertical pixels called HD + or WXGA ++, for example. The micromirror element 15 forms, for example, an HD + resolution image by reflection at each micromirror. Thus, the micromirror element 15 functions as a spatial light modulation element.

  The projection processing unit 14 drives the micromirror element 15 in order to display the image represented by the image data in accordance with the image data transmitted from the image conversion unit 13. That is, the projection processing unit 14 turns on / off each micromirror of the micromirror element 15. Here, the projection processing unit 14 drives the micromirror element 15 in a time-sharing manner at a high speed. The number of divisions per unit time is a number obtained by multiplying a frame rate according to a predetermined format, for example, 60 [frames / second], the number of color component divisions, and the number of display gradations. Further, the projection processing unit 14 controls the operation of the light source unit 16 in synchronization with the operation of the micromirror element 15. That is, the projection processing unit 14 controls the operation of the light source unit 16 so as to time-divide each frame and sequentially emit light of all color components for each frame.

  The projection lens 18 adjusts the light guided from the micromirror element 15 to light projected onto a projection target such as the screen 2. Therefore, the optical image formed by the reflected light from the micromirror element 15 is projected and displayed on the projection object such as the screen 2 via the projection lens 18. The projection lens 18 has a zoom mechanism and has a function of changing the size of the projected image. The projection lens 18 also has a focus (focus) adjustment mechanism for adjusting the in-focus state of the projection image. As described above, the projection processing unit 14, the micromirror element 15, the light source unit 16, the projection lens 18, and the like function as a projection unit that projects an image.

  The sound processing unit 24 includes a sound source circuit such as a PCM sound source. Based on the analog audio data input from the input / output connector unit 11 or on the basis of a signal obtained by analogizing the digital audio data given during the projection operation, the audio processing unit 24 drives the speaker 25 to produce a loud sound emission. Let The voice processing unit 24 generates a beep sound or the like as necessary. The speaker 25 is a general speaker that emits sound based on a signal input from the sound processing unit 24.

  The CPU 19 controls the operations of the image conversion unit 13, the projection processing unit 14, the sound processing unit 24, the lens adjustment unit 26, and the posture adjustment unit 27. The CPU 19 is connected to the main memory 20 and the program memory 21. The main memory 20 is composed of, for example, an SRAM. The main memory 20 functions as a work memory for the CPU 19. The program memory 21 is composed of an electrically rewritable nonvolatile memory. The program memory 21 stores an operation program executed by the CPU 19 and various fixed data. The CPU 19 is connected to the operation unit 22. The operation unit 22 includes a key operation unit provided in the main body of the projector 1 and an infrared light receiving unit that receives infrared light from a remote controller (not shown) dedicated to the projector 1. The operation unit 22 outputs to the CPU 19 a key operation signal based on a key operated by a user with a key operation unit of the main body or a remote controller. The CPU 19 controls the operation of each unit of the projector 1 in accordance with a user instruction from the operation unit 22 using programs and data stored in the main memory 20 and the program memory 21.

  The orientation sensor 23 includes, for example, a triaxial acceleration sensor and an orientation sensor that detects an orientation. The acceleration sensor detects the attitude angle of the projector 1 with respect to the direction of gravity, that is, the pitch and the roll angle. The yaw angle is detected as a relative direction with respect to the reference direction detected by the direction sensor. The attitude sensor 23 outputs the detection result to the CPU 19.

  The lens adjustment unit 26 drives the zoom mechanism of the projection lens 18 under the control of the CPU 19 in response to a zoom change instruction by a user operation of the operation unit 22. As a result of driving the zoom mechanism by the lens adjustment unit 26, the size of the projected image changes. In addition, the lens adjustment unit 26 drives the focusing lens of the projection lens 18 under the instruction of the CPU 19.

  The electric leg portion 28 changes the attitude of the projector 1 as an attitude adjustment mechanism. That is, the electric leg 28 can adjust the level of the projector 1 by changing the length of the leg. The posture adjustment unit 27 drives the electric leg unit 28 under the instruction of the CPU 19.

Hereinafter, the operation of the projector 1 according to the present embodiment will be described.
First, the projection operation of the projector 1 will be described. This projection operation is executed by the projection processing unit 14 under the control of the CPU 19. The operation of the light source unit 16 is controlled by the projection processing unit 14. The projection processing unit 14 changes the on / off state of the semiconductor lasers and LEDs that emit the respective colors in the light source unit 16, the combination of the light source and the phosphor, and the like, for example, red light (R), green light (G ) And three colors of blue light (B) are sequentially emitted from the light source unit 16. The projection processing unit 14 causes red light, green light, and blue light to sequentially enter the micromirror element 15 from the light source unit 16.

  The micromirror element 15 increases the time for guiding incident light to the projection lens 18 for each minute mirror (for each pixel) of each color as the gradation based on the image data is higher, and the incident light as the gradation is lower. Is reduced to the projection lens 18. That is, the projection processing unit 14 makes the micromirror so that the micromirror corresponding to the pixel with low gradation is turned on for a long time so that the micromirror corresponding to the pixel with high gradation is turned on for a long time. The element 15 is controlled. In this way, the gradation of each color can be expressed for each minute mirror (each pixel) for the light emitted from the projection lens 18.

  For each frame, a color image is expressed by combining the gradation expressed by the time when the micromirror is on for each color. As described above, projection light expressing an image is emitted from the projection lens 18. By projecting the projection light onto the screen 2, for example, a color image is displayed on the screen 2 or the like.

  In the above description, an example of a projector that uses three colors of red light, green light, and blue light has been described. However, these colors may be used to form an image by combining complementary colors such as magenta and yellow, white light, and the like. The projector may be configured so as to be able to emit the light.

  Next, the distortion correction process according to the present embodiment will be described. This distortion correction processing is performed by projective transformation of input image information in order to project an image on a projection object such as a screen 2 in a rectangular shape having as large a distortion as possible. Therefore, for example, parameters for distortion correction processing are determined when the projector 1 is installed, and distortion correction processing based on the distortion correction processing parameters is performed during actual image projection.

  A flowchart showing an example of the distortion correction operation in this embodiment is shown in FIG. 2A shows the operation on the projector side, and FIG. 2B shows the operation on the PC side.

  The projector 1 stores a program corresponding to this flowchart in the program memory 21 as a part of the projection program executed by the CPU 19.

  On the projector side, first, in step S101, the CPU 19 acquires the relative angle between the projector 1 and the screen 2. That is, when the projector 1 is installed on a horizontal base or the like, normally, the projector 1 is placed in parallel with the screen 2 and the power is turned on, and the light emitted from the projection lens 18 is projected onto the screen 2. Thus, the user changes and corrects the attitude of the projector 1. The CPU 19 can know the relative angle between the projector 1 and the screen 2 by detecting the movement of the projector 1 during the attitude change operation of the projector 1 by the attitude sensor 23.

  Next, the process proceeds to step S102. In step S102, the CPU 19 obtains the angle of view information (projector specifications). The angle-of-view information includes, for example, a slow ratio, a zoom value, a lens shift amount, and the like, and is measured by a sensor (not shown) or changed by a value stored as a prescribed value of the projector in the program memory 21 or a user operation. The obtained value can be obtained by reading or performing the above.

  If the relative angle and field angle information between the projector 1 and the screen 2 are acquired in this way, the process proceeds to step S103. In this step S103, the CPU 19 discriminates (recognizes) the shape of the pre-correction distorted quadrangle abcd based on the acquired relative angle and angle-of-view information, and the image conversion unit 13 converts the projected image into a rectangular shape on the screen 2. Distortion correction processing parameters for geometric correction so as to form an image are determined. Although there are a plurality of distortion correction clipping methods, here, for example, a clipping method that improves the pixel utilization rate is adopted.

  FIG. 3 is a diagram illustrating a relationship between the uncorrected distortion rectangle abcd and the corrected rectangle a′b′c′d ′ of the projector 1 according to the present embodiment when viewed on the projection plane. These are figures which show the case where it sees similarly on the output display element surface. This shows a case where the aspect ratio and cutout position of the corrected rectangle are determined so as to maximize the pixel utilization rate, for example, with the same projector specifications as those of FIGS. 17 and 18. The numbers in the corrected rectangle in FIG. 3 represent the aspect ratio (width / height).

  According to the present embodiment, by comparing FIG. 3 and FIG. 17, the aspect ratio increases as the absolute value of the angle h in the horizontal direction increases, and the aspect ratio increases as the absolute value of the angle v in the vertical direction increases. It is possible to discriminate the tendency that becomes smaller. When both the horizontal direction angle h and the vertical direction angle v are not zero, the aspect ratio is more influenced by the horizontal direction angle h than the vertical direction angle v. That is, it tends to be horizontally long. Each of the pixel utilization rates in FIG. 4 of this embodiment is larger than those in FIG. However, the increase in the pixel usage rate in the peripheral portion (h = v = 30 °, etc.) is slight (the pixel usage rate at h = v = 30 ° is 41.6% in FIG. 18 to 42.0% in FIG. 4). Slightly increased).

  When the actual distortion correction processing is performed according to the distortion correction processing parameters thus determined, the aspect ratio of the image changes. For example, even if a circle is displayed as an image on the PC 4 side, an image that is actually projected and displayed. Then, the circle is displayed as an ellipse.

Therefore, in the present embodiment, after determining the distortion correction processing parameter, the following processing is executed by communicating with the PC 4.
That is, on the PC 4 side, a CPU (not shown) operates according to a program stored in a memory (not shown). First, in step S401, the projector 1 is notified of the current output pixel number, that is, the default output pixel number. To do.

  In step S <b> 104, the CPU 19 of the projector 1 receives the default output pixel number notified from the PC 4 via the input / output connector unit 11 and the input / output I / F 12 and stores it in the program memory 21. Note that such an operation of acquiring the default output pixel number is not limited to after step S103, and may be performed at an arbitrary time before this.

  Then, the process of the projector 1 proceeds to step S105. In this step S105, the CPU 19 is based on the acquired relative angle and angle-of-view information, or based on the determined distortion correction processing parameter, and further stored in the program memory 21. Based on the default output pixel number, the PC recommended pixel number (horizontal pixel number, vertical pixel number) is calculated. This is to calculate what aspect ratio the image should be in order for the image after distortion correction processing to be the same as the aspect ratio of the original image, and to calculate the number of pixels of that aspect ratio. This is obtained as the PC recommended pixel number. Here, for example, the number of pixels with an aspect ratio of 1.600 includes not only 1280 × 800 pixels but also 1680 × 1050 pixels. Therefore, a plurality of candidates can be calculated as the PC recommended pixel number. Thus, if the relative angle is not h = v = 0 °, the PC recommended pixel number different from the aspect ratio of the output display element of the projection apparatus is calculated.

  It should be noted that the PC recommended pixel number to be calculated has some limitations such as a limitation that the aspect ratio is within a predetermined range and a limitation that the output pixel number is close to the default output pixel number of PC4. By providing, it is possible to prevent a large number of candidates from being calculated as the PC recommended pixel number.

  If the PC recommended pixel count is thus calculated, the process proceeds to step S106. In step S106, the CPU 19 notifies the PC 4 of the calculated PC recommended pixel number via the input / output I / F 12 and the input / output connector unit 11. Here, as described above, when a plurality of candidates exist as the PC recommended pixel number, the plurality of candidates are notified. This notification may be performed in any data format as long as the content can be discriminated on the PC 4 side, such as the EDID format.

  On the PC 4 side, in step S402, the CPU (not shown) receives the notification of the PC recommended pixel number sent from the projector 1 and stores it in the memory (not shown).

  When the communication between the projector 1 and the PC 4 is completed as described above, actual image projection is performed.

  That is, when actually projecting an image, the CPU (not shown) of the PC 4 advances the process to step S403. In step S403, the CPU (not shown) changes the number of output pixels to the PC recommended pixel number stored in the memory (not shown). When there are a plurality of PC recommended pixel numbers, for example, the maximum number of pixels among the candidates is selected or one close to the current output pixel number is selected. Select according to the criteria of use. Then, the process proceeds to step S404. In step S <b> 404, the CPU (not shown) outputs an image signal of the display target image to the projector 1 with the changed recommended number of pixels.

  In the projector 1, in step S <b> 107, the CPU 19 receives the image signal of the display target image via the input / output connector unit 11 and the input / output I / F 12 and inputs it to the image conversion unit 13. Then, the process proceeds to step S108. In step S108, the CPU 19 causes the image conversion unit 13 to perform distortion correction processing according to the distortion correction processing parameters determined in step S103 on the image signal of the input display target image. Then, the process proceeds to step S109. In step S <b> 109, the CPU 19 causes the projection processing unit 14 to project the corrected image that has been subjected to the distortion correction processing by the image conversion unit 13.

  Specifically, in the example of FIGS. 3 and 4, for example, when h is 0 ° and v is + 15 ° to + 30 °, the horizontal aspect ratio is 1.33, which is 1.33, and the vertical length is 600. If the recommended number of output pixels such as pixels is notified and projected, it is possible to perform projection with higher pixel utilization (brighter and higher resolution).

  As described above, the relative angle between the projector 1 and the PC 4 is acquired, the recommended number of pixels of the PC 4 is calculated (selected) based on the relative angle, and the recommended output is output from the PC 4 by notifying the PC 4 of it. Since the image signal of the number of pixels can be received, and the image signal is subjected to distortion correction based on the relative angle and projected, the distortion correction is performed while maintaining the aspect ratio of the original image. The degree of freedom in time can be improved.

  Further, in the distortion correction processing and the calculation of the PC recommended pixel number, the cut-out position and the output pixel number of the corrected rectangle a′b′c′d ′ that improve the pixel utilization rate of the output display element of the projector are obtained. Projection with higher pixel utilization (brighter and higher resolution) can be performed.

  In addition, the PC recommended pixel number is calculated (selected) so that the aspect ratio of the number of output pixels falls within a predetermined range. Therefore, the aspect ratio becomes too long or long. It can prevent becoming too much.

  In addition, since the default output pixel number of PC4 is acquired in advance and the output pixel number close to that is calculated (selected) as the PC recommended pixel number, it is prevented from greatly deviating from the default aspect ratio of PC4. Can do.

  Further, since a plurality of candidates are calculated (selected) as the PC recommended pixel number and notified to the PC 4, it is easy to select an output pixel number that is easy to use on the PC 4 side.

  Furthermore, by considering the angle of view information of the projector 1 in the distortion correction processing and the calculation of the PC recommended pixel number, it is possible to cope with the case where the angle of view at the time of projection is changed by adjusting the zoom lens included in the projection lens 18.

  Further, since the relative angle with respect to the screen 2 is acquired based on the detection result detected by the attitude sensor 23, an appropriate relative angle can be acquired immediately without performing distance measurement or the like. it can.

[Modification]
Note that the distortion correction processing can be performed not on the projector 1 side but on the PC 4 side. FIG. 5 is a flowchart showing an example of the distortion correction operation in this case. Here, FIG. 5A shows the operation on the projector 1 side, and FIG. 5B shows the operation on the PC 4 side.

  In this case, the CPU 19 of the projector 1 acquires the relative angle and field angle information between the projector 1 and the screen 2 in step S101 and step S102 as described above. Thereafter, the process proceeds to step S111. In step S <b> 111, the CPU 19 further acquires the number of pixels of the output display element of the projector 1 stored in advance in the program memory 21. Then, the process proceeds to step S112. In step S112, the CPU 19 notifies the PC 4 of the acquired relative angle, field angle information, and number of output display element pixels via the input / output I / F 12 and the input / output connector unit 11.

  On the PC 4 side, a CPU (not shown) receives the relative angle, field angle information, and output display element pixel number sent from the projector 1 in step S411, and stores them in a memory (not shown). Thereafter, the process proceeds to step S412. In step S412, the CPU (not shown) determines the distortion correction processing parameter based on the relative angle, the field angle information, and the number of output display element pixels stored in the memory (not shown). Although there are a plurality of distortion correction clipping methods, here, for example, a clipping method that improves the pixel utilization rate is adopted. Then, the process proceeds to step S413. In this step S413, the CPU (not shown) is based on the relative angle, the field angle information and the number of output display element pixels stored in the memory (not shown), or based on the determined distortion correction processing parameter. Further, the PC recommended pixel number (horizontal pixel number, vertical pixel number) is calculated based on the current output pixel number set in the PC 4, that is, the default output pixel number. At this time, by setting a certain limitation such as a limitation that the aspect ratio of the calculated PC recommended pixel number falls within a predetermined range or a limitation that the output pixel number is close to the default output pixel number, , One PC recommended pixel number is determined.

  When the distortion correction processing parameter and the PC recommended pixel number are determined as described above, actual image projection is performed.

  That is, when actually projecting an image, the CPU (not shown) of the PC 4 advances the process to step S414. In step S414, the CPU (not shown) converts the number of output pixels of the output target image so as to become the determined PC recommended number of pixels. Thereafter, the process proceeds to step S415. In step S415, the CPU (not shown) performs distortion correction processing according to the distortion correction processing parameters determined in step S412 on the image signal of the display target image after the output pixel number conversion. Then, the process proceeds to step S416. In step S416, the CPU (not shown) outputs an image signal of the corrected image subjected to the distortion correction processing to the projector 1.

  In the projector 1, in step S <b> 113, the CPU 19 receives the image signal of the corrected image via the input / output connector unit 11 and the input / output I / F 12, inputs it to the image conversion unit 13, and the number of gradations. The image data of a predetermined format suitable for projection is generated by performing conversion for adjusting the image data. Thereafter, the process proceeds to step S109, and the CPU 19 transmits the converted image data to the projection processing unit 14 for projection processing.

  As described above, on the PC 4 side, the relative angle between the projector 1 and the screen 2 and the angle-of-view information at the time of projection are acquired, the image signal to be output is corrected based on these, and the output image signal is recommended. By calculating the number of output pixels and outputting the image signal whose distortion has been corrected by the number of output pixels to the projector 1, the aspect ratio of the original image is maintained as in the first embodiment. The degree of freedom during distortion correction can be improved.

  Further, on the PC 4 side, the pixel utilization rate is further increased by correcting distortion in the projector 1 based on the relative angle and the angle-of-view information so as to improve the pixel utilization rate of the output display element of the projector 1 ( Bright and high resolution projections can be made.

  Further, the number of pixels of the output display element of the projector 1 is also acquired, and the recommended number of output pixels is calculated based on the acquired number of pixels, so that the projector 1 side can appropriately project. it can.

[Second Embodiment]
A second embodiment will be described. Here, differences from the first embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. In the present embodiment, the pixel utilization rate can be further increased by adjusting the roll angle during distortion correction.

  Therefore, the electric legs 28 for supporting the casing of the projector 1 function as a posture and roll angle adjustment mechanism that changes the posture and roll angle of the projector 1. That is, as shown in FIG. 6, the electric leg portion 28 adjusts the level of the projector 1 by independently changing the length of each leg 28A, or adjusts the optical axis direction (projection direction) of the projector optical system. ), That is, the roll angle can be adjusted by rotating around the optical axis.

Here, the roll angle will be described.
FIG. 7 shows a case where the z-axis is rotated as an axis of rotation after the state of FIG. 15 by an angle r in the direction of the arrow. FIG. 8 shows the details. Here, FIGS. 8A and 8B are the same as FIGS. 16A and 16B. In FIG. 8C, the third axis is rotated by an angle r that is the third angle in the direction of the arrow with the z axis as the rotation axis. Thereby, the x-axis and the y-axis move to the dotted lines, respectively. The three arrows in FIG. 8D are the projector coordinate system after first being rotated by the angle h in the horizontal direction, then rotated by the angle v in the vertical direction, and further rotated by the roll angle r. At this time, the x-axis is no longer parallel to the horizontal base 3.

  When rolled in this manner, the shape of the pre-correction distorted quadrangle abcd projected onto the screen 2 changes, so that the post-correction rectangle a′b′c′d ′ cut out inside can also be changed.

  The present embodiment pays attention to this point, and in the normal case, distortion correction is performed after eliminating the roll, whereas this embodiment attempts to increase the degree of freedom of distortion correction by actively adding the roll. To do.

  For example, when an appropriate roll is added as shown in FIG. 7, the pre-correction distortion rectangle abcd becomes larger than that in the state without the roll shown in FIG. Therefore, it is possible to increase the size of the corrected rectangle a′b′c′d ′ cut out inside the image, change the aspect ratio of the image, and improve the pixel utilization rate. .

The roll angle r which is the angle of the roll to be applied is uniquely calculated by the combination of the horizontal and vertical angles h and v with respect to the screen 2 of the projector 1. For example, the roll angle r can be calculated by a calculation formula such as the following formula (1).

However, sgn in the equation (1) is a sign function, and the details are as in the following equation (2). By this sign function sgn, when hv = 0, that is, when one or both of the horizontal direction angle h and the vertical direction angle v is zero, the roll angle r is zero, and when hv> 0, that is, the horizontal direction When the signs of the angle h and the vertical angle v are the same, the roll angle r is positive, and when hv <0, that is, when the signs of the horizontal angle h and the vertical angle v are different, the roll angle r is negative. It is supposed to become.

  According to the equation (1), the roll angle r is about 16.1 ° when h = v = 30 °.

Hereinafter, the operation of the projector 1 according to the present embodiment will be described with reference to the flowchart of FIG. 9 showing an example of the distortion correction operation in the present embodiment.
That is, after determining the distortion correction processing parameters and receiving the default number of output pixels from the PC 4 as in the first embodiment, in this embodiment, the process proceeds to step S121. In step S <b> 121, the CPU 19 determines whether the roll angle change mode is selected as the operation mode set by the user using the operation unit 22. When it is determined that the roll angle change mode is not selected, the process proceeds to step S105, and the same operation as in the first embodiment is performed.

  On the other hand, when it is determined in step S121 that the roll angle change mode is selected, the process proceeds to step S122. In step S122, the CPU 19 determines whether or not the horizontal angle h is not zero among the relative angles acquired in step S101. If the horizontal angle h is zero, the process proceeds to step S105, and the same operation as in the first embodiment is executed.

  On the other hand, if it is determined in step S122 that the horizontal angle h is not 0, the process proceeds to step S123. In step S123, the CPU 19 determines whether the vertical angle v is not zero among the relative angles acquired in step S101. If the vertical angle v is zero, the process proceeds to step S105, and the same operation as in the first embodiment is executed.

  If it is determined in step S123 that the vertical angle v is not zero, that is, if it is determined that both the horizontal and vertical angles h and v are not zero, the process proceeds to step S124. In step S124, the CPU 19 determines a roll angle r that improves the pixel utilization rate, for example, according to the above-described equation (1). Thereafter, in step S125, it is determined whether or not the determined roll angle r is within a range that can be changed by the electric leg portion 28. If the roll angle r is not within the changeable range, the process proceeds to step S126. In step S126, the CPU 19 notifies the user that the roll angle cannot be changed. For example, the sound processing unit 24 is controlled to emit a warning sound from the speaker 25, or the image conversion unit 13 is controlled to generate image data in which a warning symbol is superimposed as an OSD and projected onto the screen 2. To do. Thereafter, the process proceeds to step S105, and the same operation as in the first embodiment is executed.

  On the other hand, if it is determined in step S125 that the roll angle r is within the changeable range, the process proceeds to step S127. In step S127, the CPU 19 changes the roll angle of the projector 1 by causing the posture adjusting unit 27 to drive the electric leg portion 28 according to the roll angle r determined in step S124. Thereafter, the process proceeds to step S128. In step S128, the CPU 19 re-determines the distortion correction processing parameter in consideration of the roll angle determined in step S124. That is, in addition to the relative angle and field angle information, the shape of the pre-correction distortion rectangle abcd is determined based on the roll angle, and the distortion correction processing parameter is determined.

  FIG. 10 is a diagram illustrating a relationship between the uncorrected distortion rectangle abcd and the corrected rectangle a′b′c′d ′ of the projector 1 according to the present embodiment when viewed on the projection plane. These are figures which show the case where it sees similarly on the output display element surface. This shows a case where the aspect ratio and cutout position of the corrected rectangle are determined so as to maximize the pixel utilization rate, for example, with the same projector specifications as those of FIGS. 17 and 18. Note that the numbers in the corrected rectangles in FIG. 10 represent the aspect ratio (width / height), and the value of r = ◯◯ ° represents the respective roll angle r.

  According to the present embodiment, when FIG. 11 is compared with FIG. 4, the aspect ratio changes smoothly when the horizontal angle h and the vertical angle v are not zero, as in the first embodiment. It turns out that it is not easy to become horizontally long, and the pixel utilization rate of that portion is also greatly increased. For example, the pixel utilization rate when h = v = 30 ° is 42.0% in FIG. 4 of the first embodiment, but is significantly improved to 74.6% in FIG. 11 of the present embodiment. ing.

  When the distortion correction processing is performed by the image conversion unit 13, the height difference between the upper left vertex and the upper right vertex of the corrected rectangle a'b'c'd 'on the output display element, and the height of the lower left vertex and the lower right vertex. There may be an execution limit on the difference between the two. According to the second embodiment, the roll angle of the projection image is positively changed so as to roll, and the projection image is converted into a rectangular image on the screen 2 in consideration (reflecting) of the changed roll angle. Since the distortion correction is performed so that the difference in height is small, the correction range may be expected to be improved. That is, according to this embodiment, the degree of freedom during distortion correction can be further improved. In addition, the distortion correction range can be further improved. Furthermore, it is possible to perform projection with a higher pixel utilization rate (brighter and higher resolution) than in the first embodiment.

[Modification 1]
Note that the distortion correction processing can be performed not on the projector 1 side but on the PC 4 side, as in the modification of the first embodiment. FIG. 12 is a flowchart showing an example of the distortion correction operation in this case. Here, FIG. 12A shows the operation on the projector 1 side, and FIG. 12B shows the operation on the PC 4 side. For the sake of space, the operation on the projector 1 side shows only the part that is different from the modification of the first embodiment, that is, only the process inserted between Step S112 and Step S113.

  In this case, in the projector 1, as in the modification of the first embodiment, the relative angle, the angle of view information, and the number of output display element pixels are acquired and notified to the PC 4 side. In the first modification of the second embodiment, the process proceeds to step S131. In step S131, the CPU 19 determines whether or not the roll angle adjustment amount notified from the PC 4 is received via the input / output connector unit 11 and the input / output I / F 12.

  This roll angle adjustment amount is notified from the PC 4 as follows. That is, on the PC 4 side, the relative angle, the view angle information, and the output display element pixel number notified from the projector 1 are received, and the distortion correction processing parameter is determined based on the relative angle, the view angle information, and the output display element pixel number. In the first modification, the process proceeds to step S421. In step S421, the CPU (not shown) determines whether the roll angle change mode is selected as the operation mode set by the user. As for this operation mode, the operation mode 22 set using the operation unit 22 of the projector 1 may be received together with the relative angle, the angle of view information, and the number of output display element pixels. It may be set. When it is determined that the roll angle change mode is not selected as the operation mode, the process proceeds to step S413, and the same operation as in the second embodiment is performed.

  On the other hand, when it is determined in step S421 that the roll angle change mode is selected, the process proceeds to step S422. In step S422, the CPU (not shown) determines whether the horizontal angle h is not zero among the relative angles received in step S411. If the horizontal angle h is zero, the process proceeds to step S413, and the same operation as in the second embodiment is executed.

  On the other hand, if it is determined in step S422 that the horizontal angle h is not 0, the process proceeds to step S423. In step S423, the CPU (not shown) determines whether the vertical angle v is not zero among the relative angles received in step S411. If the vertical angle v is zero, the process proceeds to step S413, and the same operation as in the second embodiment is executed.

  If it is determined in step S423 that the vertical angle v is not zero, that is, if it is determined that both the horizontal and vertical angles h and v are not zero, the process proceeds to step S424. In step S424, the CPU (not shown) determines a roll angle r that improves the pixel utilization rate, for example, according to the above-described equation (1). Then, in step S425, the determined roll angle r is notified to the projector 1 side as the roll angle adjustment amount. Thereafter, the process proceeds to step S426. In step S426, the CPU (not shown) redetermines the distortion correction processing parameter in consideration of the roll angle r determined in step S424. That is, the shape of the pre-correction distortion quadrangle abcd is determined based on the roll angle r in addition to the relative angle and field angle information, and the distortion correction processing parameter is determined. Thereafter, the process proceeds to step S413, and the same operation as in the second embodiment is executed.

  In this way, the roll angle adjustment amount is notified from the PC 4 to the projector 1 side (step S425). If the CPU 19 of the projector 1 determines in step S131 that such a roll angle adjustment amount has been received, the process proceeds to step S132. In step S132, the CPU 19 changes the roll angle of the projector 1 by causing the posture adjusting unit 27 to drive the electric leg portion 28 according to the received roll angle adjustment amount. Thereafter, the process proceeds to step S113 (FIG. 5), and the image signal of the corrected image is received from the PC 4 and projected onto the screen 2.

  If it is determined in step S131 that the roll angle adjustment amount is not received, the process proceeds to step S113 (FIG. 5), and the image signal of the corrected image is received from the PC 4 and projected onto the screen 2. It will be.

  As described above, in the first modification, the roll angle adjustment amount is notified to the projector 1 from the PC 4 side. Therefore, in the case where the projector 1 side is capable of roll correction, the pixel utilization rate can be further increased. .

[Modification 2]
In the second embodiment, the roll angle is changed using the electric legs 28, but the roll angle change mechanism is not limited to such a configuration.

  For example, as shown in FIG. 13, it is conceivable to install the projector 1 on the rotating plate 30 provided on the inclined plate 29. In FIG. 13, p is a rotation angle of the rotating plate 30 (an angle in the yaw direction), and q is an inclination angle of the inclined plate 29 (an angle in the pitch direction). These p and q correspond to p and q in the formula (1), respectively. In this case, since the roll angle is automatically set, control and driving for changing the roll angle are not required. However, in FIG. 13, it is assumed that the screen is installed such that the z-axis of the projector coordinate system when p = q = 0 passes through the screen vertically.

  That is, the projector coordinate system of FIG. 13 is equivalent to FIG. 8D, which is the projector coordinate system after first changing the horizontal angle, then changing the vertical angle, and finally changing the roll angle. That is, the orientations of the three axes of the projector coordinate system when p≈25.7 ° and q≈33.7 ° in FIG. 13 are h = v = 30 ° and r≈16.1 ° in FIG. It becomes the same as each direction of the three axes of the projector coordinate system.

  Therefore, in the second modification, p and q can be directly detected by a sensor or the like, and the distortion correction processing parameter can be easily determined.

  In addition, the roll angle can be changed without changing the design of the projector 1.

  As described above, the present invention has been described using the embodiment. However, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage.

  For example, as the roll angle changing mechanism, various methods such as a rotating mechanism for electrically rotating the output display element inside the projector around the optical axis can be adopted instead of changing the attitude of the entire projector 1. As described above, the roll angle of the projection image is changed inside the housing of the projector 1 by changing the roll angle of the projection image by using the rotation mechanism that rotates the output display element around the optical axis. Can do. In addition, according to the structure of the above-mentioned rotation mechanism etc., when changing a roll angle, it can prevent an optical axis position from changing.

  Also, when the roll angle change is changed with the configuration shown in FIGS. 6 and 13, it is desirable that the optical axis position does not change.

  When changing the roll angle change in the configuration as shown in FIG. 6, for example, when extending one leg of the left and right legs, if the other leg is contracted according to the optical axis position in the left and right direction, the optical axis position is It can be kept unchanged.

  However, it is not essential that the optical axis position does not change when the roll angle is changed.

  In addition, it is good also as a structure which can use these roll angle change mechanisms together.

  In addition, regarding the method of obtaining the relative angle between the projector 1 and the screen 2, a known multi-point distance measuring method without using the attitude sensor 23, that is, a plurality of points up to the screen 2 (three points not on a straight line). The relative angle can be obtained by measuring the distance to the above. For this distance measurement method, any known technique such as a method using ultrasonic waves, infrared rays, or laser light may be used. Thus, by acquiring the relative angle with the screen 2 based on the measurement result measured by the distance measuring means, the relative angle can be appropriately acquired. As another method for acquiring the relative angle, various methods are employed such as projecting a test chart and acquiring it based on image data obtained by capturing the test chart, or measuring and inputting it from the operation unit 22 by the user. obtain.

  In addition, equation (1) (and equation (2)) is not an equation for obtaining the optimum roll angle, but an equation for simply obtaining a better solution, and the present invention may use other calculation equations. Of course.

  When obtaining the optimum roll angle, the optimum roll angle for each relative angle with the screen 2 is determined in advance or sequentially, by the round robin method (for example, in a controllable range, in 0.5 degree increments. The method of searching for the angle with the maximum utilization rate). Thus, if the roll angle to be changed is searched, determined, and changed, the optimum roll angle can be determined. Further, the roll angle is determined with reference to the lookup table by storing the value checked in advance in the program memory 21 as a lookup table as shown in FIG. 14, for example. Is also possible. In this way, the roll angle to be changed for each relative angle is stored, and the optimum roll angle is quickly determined by determining and changing the roll angle to be changed with reference to the stored information. Will be able to.

  Note that the image output device is not limited to a PC as long as it has a communication function with the projection device and a function of changing the number of output pixels.

  Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problem described in the column of problems to be solved by the invention can be solved and the effect of the invention can be obtained. The configuration in which this component is deleted can also be extracted as an invention. Furthermore, constituent elements over different embodiments may be appropriately combined.

Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1]
A projection device that inputs an image signal output from an image output device and projects the image signal onto a projection target,
Obtaining means for obtaining a relative angle between the projection apparatus and the projection object;
Based on the acquired relative angle, a recommended pixel number calculating means for calculating the number of output pixels recommended for the image output device;
Notification means for notifying the image output device of the calculated number of output pixels;
Distortion correcting means for correcting and projecting the image signal output from the image output device in accordance with the notified number of output pixels, based on the relative angle, and correcting the distortion;
A projection apparatus comprising:

[2]
The projection apparatus according to [1], wherein the recommended pixel number calculation unit calculates the number of output pixels so as to improve a pixel utilization rate of an output display element of the projection apparatus.

[3]
The projection apparatus according to [1] or [2], wherein the recommended pixel number calculation unit calculates the number of output pixels different from the aspect ratio of the output display element of the projection apparatus.

[4]
The recommended pixel number calculating unit calculates the number of output pixels so that the aspect ratio of the number of output pixels falls within a predetermined range. [1] to [3] Projection device.

[5]
The acquisition means further acquires a default output pixel number of the image output device,
The projection apparatus according to any one of [1] to [4], wherein the recommended pixel number calculation unit calculates an output pixel number close to the acquired default output pixel number.

[6]
The projection apparatus according to any one of [1] to [5], wherein the calculation of the recommended number of pixels includes calculating a plurality of candidates for the number of output pixels.

[7]
Roll angle changing means for changing the roll angle so that the projected image rolls;
The recommended pixel number calculating means calculates the output pixel number further considering the roll angle changed by the roll angle changing means,
The distortion correction unit projects the projection image by correcting the distortion so that the projected image becomes a rectangular image in consideration of the roll angle changed by the roll angle changing unit [1]. Thru | or the projection apparatus as described in any one of [6].

[8]
The acquisition means further acquires angle-of-view information at the time of projection of the projection apparatus,
The projection apparatus according to any one of [1] to [7], wherein the recommended pixel number calculation unit calculates the output pixel number based further on the acquired angle-of-view information.

[9]
The acquisition means includes
Ranging means for measuring distances to a plurality of points to the projection object;
The projection apparatus according to any one of [1] to [8], wherein the relative angle is acquired based on a measurement result measured by the distance measuring unit.

[10]
It further comprises posture detecting means for detecting the posture of the projection device,
The projection apparatus according to any one of [1] to [9], wherein the acquisition unit acquires the relative angle based on a detection result detected by the posture detection unit.

[11]
An image output device that cooperates with a projection device that projects an output image signal onto a projection object,
An acquisition means for acquiring a relative angle between the projection apparatus and the projection object and angle of view information at the time of projection;
Based on the acquired relative angle and the angle-of-view information, a recommended pixel number calculating unit that calculates a recommended number of output pixels of an image signal output when correcting distortion;
Distortion correction means for correcting distortion of an output image signal based on the relative angle and the angle of view information;
An output means for outputting the image signal corrected for distortion to the projection device with the calculated recommended number of output pixels;
An image output apparatus comprising:

[12]
[11], wherein the distortion correction means corrects the distortion to improve the pixel utilization rate of the output display element of the projection device based on the relative angle and the angle-of-view information. The image output device described.

[13]
The acquisition means further acquires the number of pixels of the output display element of the projection device,
The image output apparatus according to [11] or [12], wherein the recommended pixel number calculation unit calculates the recommended output pixel number based further on the acquired pixel number.

[14]
The distortion correction means corrects the distortion of the image signal so that the projection apparatus adjusts the roll angle,
The image output apparatus according to any one of [11] to [13], further comprising notification means for notifying the projection apparatus of an adjustment amount of the roll angle.

[15]
A projection method in a projection apparatus for inputting an image signal output from an image output apparatus and projecting it on a projection object,
A relative angle acquisition step of acquiring a relative angle between the projection apparatus and the projection target;
Based on the relative angle acquired by the relative angle acquisition step, a recommended pixel number calculation step of calculating the number of output pixels recommended for the image output device;
A notification step of notifying the image output device of the number of output pixels calculated by the recommended pixel number calculation step;
A distortion correction step of correcting and projecting the image signal output from the image output device according to the notified number of output pixels based on the relative angle acquired by the relative angle acquisition step;
A projection method comprising:

[16]
To a computer in a projection apparatus that inputs an image signal output from the image output apparatus and projects the image signal on a projection object,
Obtaining a relative angle between the projection apparatus and the projection object;
Calculating the recommended number of output pixels for the image output device based on the acquired relative angle;
Notifying the image output device of the calculated number of output pixels;
Projecting the image signal output from the image output device according to the notified number of output pixels after correcting the distortion based on the relative angle;
Projection program to execute.

    DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Screen, 3 ... Horizontal base, 4 ... Personal computer (PC), 11 ... Input / output connector part, 12 ... Input / output interface, 13 ... Image conversion part, 14 ... Projection processing part, 15 ... Micromirror Element: 16 ... Light source unit, 17 ... Mirror, 18 ... Projection lens, 19 ... CPU, 20 ... Main memory, 21 ... Program memory, 22 ... Operation unit, 23 ... Attitude sensor, 24 ... Audio processing unit, 25 ... Speaker, 26: Lens adjusting unit, 27: Posture adjusting unit, 28 ... Electric leg unit, 28A ... Leg, 29 ... Inclined plate, 30 ... Rotating plate.

Claims (16)

A projection device that inputs an image signal output from an image output device and projects the image signal onto a projection target,
Obtaining means for obtaining a relative angle between the projection apparatus and the projection object;
Based on the acquired relative angle, a recommended pixel number calculating means for calculating the number of output pixels recommended for the image output device;
Notification means for notifying the image output device of the calculated number of output pixels;
Distortion correcting means for correcting and projecting the image signal output from the image output device in accordance with the notified number of output pixels, based on the relative angle, and correcting the distortion;
A projection apparatus comprising:   The projection apparatus according to claim 1, wherein the recommended pixel number calculation unit calculates the number of output pixels so as to improve a pixel utilization rate of an output display element of the projection apparatus.   The projection apparatus according to claim 1, wherein the recommended pixel number calculation unit calculates an output pixel number different from an aspect ratio of an output display element of the projection apparatus.   The said recommended pixel number calculation means calculates the output pixel number that the aspect ratio of the said output pixel number becomes a predetermined range, The Claim 1 thru | or 3 characterized by the above-mentioned. Projection device. The acquisition means further acquires a default output pixel number of the image output device,
5. The projection apparatus according to claim 1, wherein the recommended pixel number calculating unit calculates an output pixel number close to the acquired default output pixel number. 6.   The projection device according to claim 1, wherein the calculation of the recommended number of pixels includes calculating a plurality of candidates for the number of output pixels. Roll angle changing means for changing the roll angle so that the projected image rolls;
The recommended pixel number calculating means calculates the output pixel number further considering the roll angle changed by the roll angle changing means,
2. The distortion correcting unit projects the projected image after correcting the distortion so that the projected image becomes a rectangular image in consideration of the roll angle changed by the roll angle changing unit. The projection device according to any one of claims 6 to 6. The acquisition means further acquires angle-of-view information at the time of projection of the projection apparatus,
The projection apparatus according to claim 1, wherein the recommended pixel number calculation unit calculates the output pixel number based further on the acquired angle-of-view information. The acquisition means includes
Ranging means for measuring distances to a plurality of points to the projection object;
The projection apparatus according to claim 1, wherein the relative angle is acquired based on a measurement result measured by the distance measuring unit. It further comprises posture detecting means for detecting the posture of the projection device,
The projection apparatus according to claim 1, wherein the acquisition unit acquires the relative angle based on a detection result detected by the posture detection unit. An image output device that cooperates with a projection device that projects an output image signal onto a projection object,
An acquisition means for acquiring a relative angle between the projection apparatus and the projection object and angle of view information at the time of projection;
Based on the acquired relative angle and the angle-of-view information, a recommended pixel number calculating unit that calculates a recommended number of output pixels of an image signal output when correcting distortion;
Distortion correction means for correcting distortion of an output image signal based on the relative angle and the angle of view information;
An output means for outputting the image signal corrected for distortion to the projection device with the calculated recommended number of output pixels;
An image output apparatus comprising:   12. The distortion correction unit according to claim 11, wherein the distortion correction unit corrects the distortion to improve a pixel utilization rate of an output display element of the projection device based on the relative angle and the angle of view information. The image output device described. The acquisition means further acquires the number of pixels of the output display element of the projection device,
The image output apparatus according to claim 11 or 12, wherein the recommended pixel number calculating unit calculates the recommended output pixel number further based on the acquired pixel number. The distortion correction means corrects the distortion of the image signal so that the projection apparatus adjusts the roll angle,
The image output apparatus according to claim 11, further comprising a notification unit that notifies the projection apparatus of an adjustment amount of the roll angle. A projection method in a projection apparatus for inputting an image signal output from an image output apparatus and projecting it on a projection object,
A relative angle acquisition step of acquiring a relative angle between the projection apparatus and the projection target;
Based on the relative angle acquired by the relative angle acquisition step, a recommended pixel number calculation step of calculating the number of output pixels recommended for the image output device;
A notification step of notifying the image output device of the number of output pixels calculated by the recommended pixel number calculation step;
A distortion correction step of correcting and projecting the image signal output from the image output device according to the notified number of output pixels based on the relative angle acquired by the relative angle acquisition step;
A projection method comprising: To a computer in a projection apparatus that inputs an image signal output from the image output apparatus and projects the image signal on a projection object,
Obtaining a relative angle between the projection apparatus and the projection object;
Calculating the recommended number of output pixels for the image output device based on the acquired relative angle;
Notifying the image output device of the calculated number of output pixels;
Projecting the image signal output from the image output device according to the notified number of output pixels after correcting the distortion based on the relative angle;
Projection program to execute.

Images