JP2014086788A - Projection apparatus, projection control device, projection system and projection state adjusting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection apparatus in which an outline position of a projection region is easily identified even when a chart for adjustment is projected larger than a body to be projected and the outline of the projection region is positioned outside of the projected body.SOLUTION: A case where a chart 100 for adjustment is projected larger than a screen 200 which is a body to be projected as illustrated in Fig (a) and an outer frame 110 is not projected on the screen 200 as illustrated in Fig (b) is considered. A position of an upper side of the outer frame 110 may be easily identified from an interval 151 between an upper side of the screen 200 and an intersection of sides 121 and 122 of a diamond 120. Similarly, may also be easily identified a position of a right side of the outer frame 110 from an interval 152 and a lower side of the outer frame 110 from an interval 153.

Description

  The present invention relates to a projection apparatus, a projection control apparatus, a projection system, and a projection state adjustment method.

  In general, a projector is known as an image projection apparatus that projects an image based on image data output from a personal computer or the like onto a projection object such as a screen. When such a projector is installed, first, the projection area of the projector with respect to a projection object such as a screen is adjusted. For example, Patent Document 1 discloses that an adjustment chart is used for adjusting the projection area.

JP 2001-067015 A

  For example, in the adjustment chart disclosed in Patent Document 1, when the adjustment chart is projected larger than the projection target, the position of the outline of the projection region may be unknown. In particular, when the object to be projected is arranged away from an object such as a wall behind it, it becomes more difficult to specify the position of the outline of the projection region.

  Therefore, the present invention provides a projection device that can easily specify the outline position of a projection area even when the adjustment chart is projected larger than the projection object and the outline of the projection area is located outside the projection object. An object is to provide a projection control apparatus, a projection system, and a projection state adjustment method.

  In order to achieve the above object, according to one aspect of the present invention, a projection apparatus projects an image onto a projection object, and is an adjustment chart that indicates a projectable region. A projection control unit that projects the adjustment chart in which the outline of the projectable area is specified based on the part even if only a part is projected on the projection target.

In order to achieve the above object, according to one aspect of the present invention, a projection control apparatus is a projection control apparatus that controls a plurality of projection apparatuses that project an image toward a projection target, and that indicates a projectable area. Even if only a part of the adjustment chart is projected onto the projection object, the adjustment chart in which the outline of the projectable region is specified based on the part is a plurality of adjustment charts. In order to achieve the above object, according to one aspect of the present invention, a projection system includes a projection control apparatus and a plurality of projections controlled by the projection control apparatus. An apparatus.

  In order to achieve the above object, according to one aspect of the present invention, a projection state adjustment method is a projection state adjustment method for adjusting a projection area on a projection target in a projection apparatus that projects an image on the projection target. Adjusting the horizontal or vertical degree of the projection device with respect to the projection object to adjust the reference angle of the angle of view of the projection area, and rotating the direction of the projection device in the horizontal or vertical direction. The upper and lower sides of the projection area are made horizontal with respect to the projection object, or the left and right sides are made perpendicular to the projection object, and the projection device is set in the horizontal or vertical direction. Adjusting the horizontal or vertical position of the projection object and the projection area by moving the projection object and rotating the orientation of the projection device in the vertical direction or horizontal direction. Vertical or horizontal with the area And adjusting the position of the direction, by adjusting the optical system of the projection device comprises a, a step of changing the size of the projection area.

  According to the present invention, even when the adjustment chart is projected larger than the projection target and the outline of the projection area is located outside the projection target, the projection that can easily specify the outline position of the projection area An apparatus, a projection control apparatus, a projection system, and a projection state adjustment method can be provided.

FIG. 2 is a block diagram illustrating a configuration example of a projector according to the first embodiment. The figure which shows an example of the chart for adjustment which concerns on 1st Embodiment. The figure for demonstrating the chart for adjustment which concerns on 1st Embodiment. The figure for demonstrating geometric correction. 6 is a flowchart illustrating an example of a projection state adjustment process according to the first embodiment. 6 is a flowchart illustrating an example of a landscape aspect ratio maintaining process according to the first embodiment. It is a figure for demonstrating the landscape aspect ratio maintenance process which concerns on 1st Embodiment, and is a figure which shows an example of the relationship between the screen and adjustment chart by the position and attitude | position of a projector. It is a figure for demonstrating the portrait aspect ratio maintenance process which concerns on 1st Embodiment, and is a figure which shows an example of the relationship between a screen and the chart for adjustment. It is a figure for demonstrating the horizontal fitting priority process which concerns on 1st Embodiment, and is a figure which shows an example of the relationship between a screen and the chart for adjustment. It is a figure for demonstrating the vertically long fitting priority process which concerns on 1st Embodiment, and is a figure which shows an example of the relationship between a screen and the chart for adjustment. The figure which shows another example of the chart for adjustment which concerns on 1st Embodiment. The figure for demonstrating the relationship between the projector and projection image which concern on 2nd Embodiment. The figure for demonstrating the relationship between the projector and projection image which concern on 2nd Embodiment. The block diagram which shows the structural example of the projection system which concerns on 2nd Embodiment. 9 is a flowchart illustrating an example of stack projection adjustment processing according to the second embodiment. It is a figure for demonstrating the stack projection adjustment process which concerns on 2nd Embodiment, and is a figure which shows an example of the relationship between the screen and adjustment chart by the position and attitude | position of a projector. It is a figure for demonstrating the geometric correction which concerns on 3rd Embodiment, and is a figure which shows an example of the relationship between a screen and the chart for adjustment. The figure which shows another example of the chart for adjustment which concerns on 3rd Embodiment. The figure which shows an example of the chart for adjustment which concerns on 4th Embodiment. It is a figure for demonstrating the geometric correction which concerns on 4th Embodiment, and is a figure which shows an example of the relationship between a screen and the chart for adjustment. It is a figure for demonstrating the geometric correction which concerns on 4th Embodiment, and is a figure which shows another example of the relationship between a screen and the chart for adjustment. The flowchart which shows an example of the geometric correction process which concerns on 4th Embodiment. The figure which shows another example of the chart for adjustment which concerns on 4th Embodiment. The figure which shows an example of the chart for adjustment which concerns on 5th Embodiment. The figure which shows another example of the chart for adjustment which concerns on 5th Embodiment.

[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. FIG. 1 shows an outline of the configuration of a projector 1 as a projection apparatus according to this embodiment. 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 18, and a projection. Lens 20, CPU 25, main memory 26, program memory 27, operation unit 28, attitude sensor 29, sound processing unit 30, speaker 32, projection adjustment unit 40, imaging unit 52, and lens adjustment Section 54, position and orientation adjustment section 56, electric leg section 58, and 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. 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 30 via the input / output I / F 12 and the system bus SB. The input / output connector unit 11 is also provided with, for example, an RS232C terminal and a USB terminal, which are used when connected to a video apparatus (projection control apparatus) in a second embodiment to be described later.

  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 geometric conversion of the projected image as necessary, and projects an image in an appropriate shape on a projection object such as a screen according to the projection state.

  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 18 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 light emitted from the light source unit 16 toward the projection lens 20 or to deflect it from the direction of the projection lens 20. In the micromirror element 15, micromirrors are arranged, for example, for WXGA (Wide eXtended Graphic Array) (horizontal 1280 pixels × vertical 800 pixels). The micromirror element 15 forms an image with WXGA resolution, for example, 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 20 adjusts the light guided from the micromirror element 15 to light projected onto a projection target such as a screen (not shown). Therefore, the optical image formed by the reflected light from the micromirror element 15 is projected and displayed on a projection object such as a screen via the projection lens 20. The projection lens 20 has a zoom mechanism and has a function of changing the size of the projected image. The projection lens 20 also has a focus (focus) adjustment mechanism for adjusting the in-focus state of the projection image. Thus, the projection processing unit 14, the micromirror element 15, the light source unit 16, the projection lens 20, and the like function as a projection unit that projects an image.

  The sound processing unit 30 includes a sound source circuit such as a PCM sound source. Based on analog audio data input from the input / output connector unit 11 or based on a signal obtained by analogizing digital audio data given at the time of projection operation, the audio processing unit 30 drives the speaker 32 to produce a loud sound emission. Let In addition, the sound processing unit 30 generates a beep sound or the like as necessary. The speaker 32 is a general speaker that emits sound based on a signal input from the sound processing unit 30.

  The CPU 25 controls operations of the image conversion unit 13, the projection processing unit 14, the sound processing unit 30, and a projection adjustment unit 40, a lens adjustment unit 54, and a position / orientation adjustment unit 56 which will be described later. The CPU 25 is connected to the main memory 26 and the program memory 27. The main memory 26 is composed of, for example, an SRAM. The main memory 26 functions as a work memory for the CPU 25. The program memory 27 is composed of an electrically rewritable nonvolatile memory. The program memory 27 stores an operation program executed by the CPU 25, various fixed data, and the like. The CPU 25 is connected to the operation unit 28. The operation unit 28 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 28 outputs to the CPU 25 a key operation signal based on a key operated by a user using a key operation unit of the main body or a remote controller. The CPU 25 uses the programs and data stored in the main memory 26 and the program memory 27 to control the operation of each unit of the projector 1 in accordance with a user instruction from the operation unit 28.

  The attitude sensor 29 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 29 outputs the detection result to the projection adjustment unit 40.

  The imaging unit 52 can capture a projection image from the projector 1. The imaging unit 52 performs imaging under the instruction of the projection adjustment unit 40 and outputs imaging data to the projection adjustment unit 40. The lens adjustment unit 54 drives the zoom mechanism of the projection lens 20 under the instruction of the projection adjustment unit 40. As a result of the zoom mechanism being driven by the lens adjustment unit 54, the size of the projected image changes. The lens adjustment unit 54 drives the focusing lens of the projection lens 20 under the instruction of the projection adjustment unit 40.

  The electric leg 58 changes the position and orientation of the projector 1 as a position and orientation adjustment mechanism. That is, the electric leg 58 can adjust the level of the projector 1 by changing the length of the leg. In addition, the electric leg 58 can adjust the projection direction up, down, left, and right by swinging the head 1 without changing the position of the projector 1. Moreover, the electric leg part 58 has a wheel, for example, and can translate the position of a projector back and forth, right and left on the desk where the projector 1 is installed, for example. The position / orientation adjustment unit 56 drives the electric leg 58 under the instruction of the projection adjustment unit 40.

  The projection adjustment unit 40 uses the position and orientation of the projector 1, the magnification of the projection lens, the geometric transformation of the image, and the like to make adjustments for appropriately projecting an image on a projection object such as a screen. The projection adjustment unit 40 includes a chart generation unit 41, an adjustment value calculation unit 42, and a correction parameter determination unit 43. The chart generation unit 41 performs control related to the projection of the adjustment chart. The chart generation unit 41 reads the adjustment chart stored in the program memory 27, transmits the adjustment chart data to the projection processing unit 14, and projects the adjustment chart. The adjustment value calculation unit 42 calculates an adjustment value such as a driving amount of each unit of the projector 1 based on a captured image captured by the imaging unit 52, for example. This adjustment value includes, for example, the driving amount of the focusing lens and zoom lens of the projection lens 20, the amount of change in the leg length of the electric leg, the amount of neck swing in the vertical and horizontal directions, and the amount of translation movement. included. The adjustment value calculation unit 42 outputs the calculated adjustment value to the lens adjustment unit 54 and the position / orientation adjustment unit 56. The correction parameter determination unit 43 calculates the geometric transformation amount of the projection image. The correction parameter determination unit 43 determines a correction parameter related to geometric transformation to be performed on the image to be projected including the adjustment chart. The correction parameter determination unit 43 outputs the determined correction parameter to the chart generation unit 41. The chart generation unit 41 performs geometric conversion of the adjustment chart based on the correction parameter acquired from the correction parameter determination unit 43. Further, the correction parameter determination unit 43 outputs the determined correction parameter to the image conversion unit 13. When displaying an image other than the adjustment chart, the image conversion unit 13 performs geometric conversion on the image based on the correction parameter acquired from the correction parameter determination unit 43.

  An 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 25. 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 the incident light to the projection lens 20 as the gradation based on the image data is higher for each minute mirror (each pixel) for each color of light, and the incident light as the gradation is lower. Is reduced to the projection lens 20. 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 20.

  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 20. By projecting this projection light onto a screen, for example, a color image is displayed on the screen 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, projection state adjustment according to the present embodiment will be described. This projection state adjustment is an adjustment for projecting an image on a projection object such as a screen, for example, in a rectangular shape as large as possible without distortion. This projection state adjustment is performed, for example, when the projector 1 is installed.

  In the present embodiment, an adjustment chart is used for projection state adjustment. First, the adjustment chart will be described. An example of the adjustment chart is shown in FIG. As shown in this figure, the adjustment chart 100 includes an outer frame 110 indicating the outermost side of the projection area. The outer frame 110 includes an upper side line 111, a lower side line 112, a left side line 113, and a right side line 114. The adjustment chart 100 includes a rhombus 120 that is inscribed in the outer frame 110. The rhombus 120 includes sides 121, 122, 123, and 124. The side 121 and the side 122 intersect at an upper vertex 126, and the upper vertex 126 is located at the center of the upper side line 111. The side 123 and the side 124 intersect at a lower vertex 127, and the lower vertex 127 is located at the center of the lower side line 112. The side 121 and the side 123 intersect at the left vertex 128, and the left vertex 128 is located at the center of the left side line 113. The side 122 and the side 124 intersect at the right vertex 129, and the right vertex 129 is located at the center of the right side line 114. Further, the adjustment chart 100 includes a cross mark 130 having an intersection at the center of gravity of the outer frame 110. The cross mark 130 includes a horizontal line 131 and a vertical line 132.

  According to such an adjustment chart 100, the positional relationship between the projection area of the projector 1 and the projection object such as a screen can be obtained as follows. That is, for example, as shown in FIG. 3A, it is assumed that the adjustment chart 100 is projected on the screen 200 indicated by a broken line. At this time, when the screen 200 and the wall behind the screen 200 are separated from each other, the adjustment chart 100 can only see the portion projected on the screen 200 as shown in FIG. Therefore, for example, as shown in FIG. 3C, the adjustment chart 100 has only the outer frame 110, or as shown in FIG. 3D, the adjustment chart includes the outer frame 110 and the outer frame 110. When there is only the diagonal line 140, it is unclear as to which position each side not projected on the screen 200 such as the upper side line 111 is located.

  On the other hand, according to the adjustment chart 100 according to the present embodiment, as shown in FIG. 3B, the position of the upper side line 111 can be estimated by the interval 151 formed by the side 121 and the side 122. Similarly, the position of the right side line 114 can be estimated by the interval 152 formed by the side 122 and the side 124. Similarly, the position of the lower side line 112 can be estimated by the interval 153 formed by the side 123 and the side 124. Thus, the upper side line 111, the lower side line 112, the left side line 113, and the right side line 114 are not projected on the screen 200 by the rhombus 120 in contact with the upper side line 111, the lower side line 112, the left side line 113, and the right side line 114. Also, the positions of those sides can be estimated. Therefore, according to the adjustment chart 100 according to the present embodiment, the projection position with respect to the screen 200 can be adjusted quickly and easily.

  Further, the inclination of the adjustment chart 100 due to the inclination of the projector 1 and the like can be detected only by the rhombus 120, but the inclination of the adjustment chart 100 can be detected more easily by providing the cross mark 130. The cross mark 130 is also preferably provided.

  FIG. 3 shows the adjustment chart 100 as an example in the case of being projected from the front of the screen 200 for simplicity. On the other hand, for example, when the projector 1 is installed below the center of the screen 200, the projection area where light is projected through the projection lens 20 is distorted into a trapezoid. In general, when a projection region is distorted into a trapezoid or the like, correction using geometric transformation may be performed to correct this. That is, for example, as shown in FIG. 4A, when the projection area 162 that can be projected onto the screen 200 is distorted into a trapezoid, the image is corrected to be rectangular as shown in FIG. 4B. The projected image may undergo geometric transformation so that it is projected onto the image area 164. At this time, black is displayed in the region 166 indicated by diagonal lines in FIG. That is, when geometric transformation is performed, only a part of the area that can be projected by the projector 1 is used. As a result, the brightness of the projected image is relatively decreased as compared to the case where all the areas that can be projected by the projector 1 are used. In this case, the resolution of the projected image is also reduced.

  Therefore, when an image is projected on the screen 200 by geometric transformation, the projection area 162 circumscribes the screen 200, that is, the projection area 162 is larger than the screen 200 and the projection area 162 is as small as possible. Thus, it is preferable that the position and orientation of the projector 1 are adjusted. Even when such geometric transformation is performed, the adjustment chart 100 according to the present embodiment is effective. That is, if the adjustment chart 100 according to the present embodiment is used, it can be detected even if the outer frame 110 is located outside the screen 200, so that the position of the projector 1 and the projection area are circumscribed to the screen 200. The posture can be adjusted. As a result, as high brightness and high resolution as possible are obtained even when geometric transformation is used.

  FIG. 5 is a flowchart showing an example of the projection state adjustment process according to this embodiment. The projector 1 has a plurality of adjustment charts as shown in FIG. The user selects one adjustment chart in the projection state adjustment. In step S101, the projection adjustment unit 40 determines whether an adjustment chart has been selected. When it is determined that the adjustment chart is not selected, the process repeats step S101 and waits. On the other hand, when it is determined that the adjustment chart has been selected, the process proceeds to step S102. Note that only one adjustment chart may be prepared, and in this case, the process of step S101 may not be performed.

  In step S <b> 102, the projection adjustment unit 40 reads the adjustment chart data from the program memory 27 and projects the adjustment chart. That is, the projection adjustment unit 40 outputs the image information of the adjustment chart to the projection processing unit 14 and instructs the projection processing unit 14 to project the adjustment chart. In step S103, the projection adjustment unit 40 determines whether or not the automatic adjustment function is on. If it is determined to be on, the process proceeds to step S104.

  In step S104, the projection adjustment unit 40 measures the distance to the screen. As the distance measuring method, any known technique such as a method using ultrasonic waves or infrared rays may be used. In step S105, the projection adjustment unit 40 adjusts the focus in step S104. The focus adjustment may be performed based on the contrast of the projected adjustment chart. In this case, the distance measurement in step S104 is not performed, and imaging described later is repeatedly performed.

  In step S106, the projection adjustment unit 40 places the imaging unit 52 in a standby state. In step S107, the projection adjustment unit 40 causes the imaging unit 52 to perform imaging, and obtains a captured image obtained by imaging the current projection state on which the screen and the adjustment chart are projected. In step S108, the projection adjustment unit 40 recognizes the shape of the screen viewed from the projector 1 based on the captured image. For example, the projection adjustment unit 40 can recognize the shape of the screen by detecting an edge corresponding to the screen in the captured image.

  In step S109, the projection adjustment unit 40 estimates the screen aspect ratio based on the captured image. That is, based on the screen shape recognized in step S108, for example, the ratio of the screen width to the screen height is calculated. When the projector 1 is not positioned in front of the screen but is tilted, the screen shape in the captured image is, for example, a trapezoid. In such a case, the aspect ratio may be calculated based on representative values representing the width and height, such as the width and height at the center of the screen, the average value of the width, and the average value of the height. Further, the aspect ratio may be calculated by calculating back the actual screen shape based on the trapezoidal shape in the captured image.

  The projector 1 according to the present embodiment provides an aspect ratio maintenance setting and a fitting priority setting. In the aspect ratio maintenance setting, the aspect ratio of the projected image is maintained. When the aspect ratio of the projected image and the aspect ratio of the screen do not match, a blank area where no image is projected is provided on the screen. On the other hand, in the fitting priority setting, the aspect ratio of the projected image is adjusted according to the aspect ratio of the screen, and the image is projected on the entire screen. At this time, since the projected image is adjusted by geometric conversion according to the aspect ratio of the screen, the image is distorted vertically or horizontally. Further, as will be described later, since the geometrical transformation is performed so as not to use a part of the region projected by the projector 1 (to make a black image), the projection image is greatly projected, so that the brightness of the projected image is lowered accordingly.

  In step S110, the projection adjustment unit 40 determines whether or not the aspect ratio is maintained. If it is determined that the aspect ratio is maintained, the process proceeds to step S111. In step S111, the projection adjustment unit 40 determines whether or not the screen is horizontally longer than the projection image. When it is determined that the image is horizontally long, the process proceeds to step S112. In step S112, the projection adjustment unit 40 performs a horizontally long aspect ratio maintaining process. The landscape aspect ratio maintaining process will be described with reference to the flowchart shown in FIG. 6 and FIG. In FIG. 7, the broken line indicates the screen 200 and the solid line indicates the projected adjustment chart 100.

  In step S201, the projection adjustment unit 40 calculates the adjustment amount of the position and orientation of the projector 1 based on the captured image. This adjustment amount is an amount necessary for the adjustment described below.

  In step S202, the projection adjustment unit 40 causes the position / orientation adjustment unit 56 to perform rotation adjustment based on the adjustment amount calculated in step S201. That is, the length of the legs that support the projector 1 is adjusted to adjust the level of the projector 1 (adjustment of the reference angle of view angle (rolling adjustment) is performed). By this adjustment, the relationship between the screen 200 initially in the state shown in FIG. 7A and the projected adjustment chart 100 becomes the state shown in FIG. 7B. That is, the horizontal line 131 of the cross mark 130 of the adjustment chart 100 is adjusted to be horizontal. The adjustment amount of the rotation adjustment may be calculated based on an angle formed by the horizontal line 131 of the cross mark 130 and the upper and lower sides of the screen 200. The screen is assumed to have the upper side and the lower side installed horizontally. It may be calculated based on the output of the attitude sensor 29.

  In step S203, the projection adjustment unit 40 causes the position / orientation adjustment unit 56 to swing the head in the left-right direction based on the adjustment amount calculated in step S201. That is, the rotating shaft of the electric leg 58 is rotated to rotate the projector 1 in the left-right direction (yaw adjustment is performed). By this adjustment, the relationship between the screen 200 in the state as shown in FIG. 7B and the projected adjustment chart 100 becomes the state as shown in FIG. That is, the upper side line 111 and the lower side line 112 of the outer frame 110 of the adjustment chart 100 are horizontal, and the vertical line 132 of the cross mark 130 is vertical to the horizontal line 131.

  In step S204, the projection adjustment unit 40 causes the position / orientation adjustment unit 56 to perform parallel movement in the left-right direction based on the adjustment amount calculated in step S201. That is, the wheels of the electric legs 58 are driven to translate the projector 1 in the left-right direction. By this adjustment, the relationship between the screen 200 in the state shown in FIG. 7C and the projected adjustment chart 100 becomes the state shown in FIG. 7D. That is, the vertical line 132 of the cross mark 130 of the adjustment chart 100 is positioned at the center of the screen 200 in the left-right direction.

  In step S205, the projection adjustment unit 40 causes the position / orientation adjustment unit 56 to swing the head in the vertical direction based on the adjustment amount calculated in step S201. That is, the rotating shaft of the electric leg 58 is rotated to rotate the projector 1 in the vertical direction (pitching (tilt) adjustment is performed). By this adjustment, the relationship between the screen 200 in the state shown in FIG. 7D and the projected adjustment chart 100 becomes the state shown in FIG. That is, the horizontal line 131 of the cross mark 130 of the adjustment chart 100 is positioned near the center of the screen 200 in the vertical direction. More precisely, as shown in FIG. 7E, when the upper side line 111 is longer than the lower side line 112, that is, when the projector 1 is looking up from the bottom of the screen 200, the horizontal line 131 is displayed on the screen. It is located above the center of 200 in the vertical direction.

  In step S206, the projection adjustment unit 40 causes the lens adjustment unit 54 to adjust the zoom mechanism based on the adjustment amount calculated in step S201. By this adjustment, the relationship between the screen 200 in the state shown in FIG. 7E and the projected adjustment chart 100 becomes the state shown in FIG. That is, the upper side line 111 of the outer frame 110 of the adjustment chart 100 matches the upper side of the screen 200, and the lower side line 112 matches the lower side of the screen 200. As described above, the size of the projection image can be changed by the zoom mechanism of the projection lens 20, and the position and posture of the projector 1 can be adjusted by the electric leg portion 58.

  In step S207, the projection adjustment unit 40 causes the chart generation unit 41 to perform correction by geometric conversion based on the adjustment amount calculated in step S201. By this correction, the relationship between the screen 200 in the state as shown in FIG. 7F and the projected adjustment chart 100 becomes the state as shown in FIG. That is, the left side line 113 and the right side line 114 of the outer frame 110 of the adjustment chart 100 are parallel to the left and right sides of the screen 200. Here, an image filled with black is projected onto the area indicated by hatching in FIG. In other words, a part of the area that can be projected by the projector 1 is used to obtain a rectangular projection area. The correction parameter determination unit 43 outputs the correction parameters used at this time to the image conversion unit 13. The image conversion unit 13 performs geometric conversion using the input correction parameter in the image conversion. Thereafter, the horizontal aspect ratio maintaining process ends, and the process returns to the projection state adjustment process.

  As described above, according to the horizontally long aspect ratio maintaining process, the projection state is adjusted so that the upper and lower sides of the projection image coincide with the upper and lower sides of the screen 200 and blanks are formed on the left and right sides of the screen 200. According to the horizontally long aspect ratio maintaining process, each unit of the projector 1 is adjusted so that the projection image is optimally projected on the screen 200.

  In the present embodiment, a case has been described in which a captured image is obtained only once in step S107, and all adjustment amounts are calculated at once in step S201 based on the captured image. When the total adjustment amount is calculated from one captured image in this way, the number of imaging is reduced, and the processing is simplified. However, the present invention is not limited to this, and imaging may be performed after each step from step S202 to step S207, and the adjustment amount may be calculated for each step. In this case, the number of imaging processes increases, but the amount of calculation performed in calculating the adjustment amount decreases.

  In the present embodiment, geometric transformation is performed in step S207, and adjustment from the projection state of FIG. 7F to the projection state of FIG. 7G is performed. On the other hand, when the front and rear heights of the projector 1 can be individually adjusted by the electric legs 58, the front and rear heights of the projector 1 are individually changed regardless of geometric conversion. Then, the trapezoid may be corrected. Further, in the processing from step S202 to step S206, the position and posture of the projector 1 are adjusted by the electric leg 58. When the electric leg portion 58 cannot perform part or all of the adjustment of the position and posture, the adjustment may be supplemented by geometric conversion. For example, when the parallel movement by the wheels in step S204 cannot be performed, this adjustment may be performed by geometric conversion. Further, at this time, the projection position may be shifted to the left and right by swinging in the left-right direction, and the projection distortion generated at that time may be adjusted by geometric transformation. That is, various adjustment methods can be considered, but the adjustment method can be set to be selected by a predetermined method. Further, the adjustment procedure described with reference to FIG. 6 is an example, and the order can be changed as appropriate. For example, the horizontality may be adjusted after adjusting the verticality.

  Returning to FIG. 5, the description of the projection state adjustment processing will be continued. After the horizontal aspect ratio maintaining process in step S112, the process proceeds to step S117. If it is determined in step S111 that the screen is not horizontally longer than the projected image, that is, if it is determined that the screen is vertically longer than the projected image, the process proceeds to step S113.

  In step S113, the projection adjustment unit 40 performs a portrait aspect ratio maintaining process. When the vertically long aspect ratio maintaining process is performed, the aspect ratio of the screen 200 is different from the aspect ratio of the projected image, and the screen 200 is vertically long. Therefore, in the vertical aspect ratio maintaining process, as shown in FIG. 8, the left and right sides of the outer frame 110 of the adjustment chart and the left and right sides of the screen 200 coincide with each other so that margins are provided above and below the screen 200. In addition, each part of the projector 1 is adjusted. The basic procedure of adjustment is the same as the horizontal aspect ratio maintaining process described with reference to FIG. After the portrait aspect ratio maintaining process, the process proceeds to step S117.

  If it is determined in step S110 that the aspect ratio maintenance setting is not set, that is, if it is determined that the fitting priority setting is set, the process proceeds to step S114. In step S114, the projection adjustment unit 40 determines whether or not the screen is horizontally longer than the projection image. When it is determined that the image is horizontally long, the process proceeds to step S115.

  In step S115, the projection adjustment unit 40 performs a horizontally long fitting priority process. In the horizontally long fitting priority process, as shown in FIG. 9A, each part of the projector 1 is adjusted so that the left and right sides of the adjustment chart 100 coincide with the left and right sides of the screen 200. Furthermore, in the horizontally long fitting priority process, as shown in FIG. 9B, geometric correction is performed in accordance with the screen 200 from this state. That is, the projected image is compressed in the vertical direction. As a result, the aspect ratio of the projected image is adjusted to be horizontally long according to the screen. Thus, according to the horizontally long fitting priority process, the entire surface of the screen 200 is used as a projection plane.

  It should be noted that an image filled with black is projected in the area indicated by hatching in FIG. 9B. That is, only a part of the area that can be projected by the projector 1 is used. Note that in such fitting priority setting, the zoom magnification is larger than in the aspect ratio maintenance setting and the image is projected larger, so that the brightness of the image is relatively lowered. After the landscape fitting priority process, the process proceeds to step S117.

  When it is determined in step S114 that the screen is not horizontally long than the projected image, that is, when it is determined that the screen is vertically longer than the projected image, the process proceeds to step S116. In step S116, the projection adjustment unit 40 performs the vertical fitting priority process. In the vertically long fitting priority process, as shown in FIG. 10A, each part of the projector 1 is adjusted so that the upper and lower sides of the adjustment chart 100 coincide with the upper and lower sides of the screen 200. Further, in the vertically long fitting priority process, as shown in FIG. 10B, geometric correction is performed in accordance with the screen 200 from this state. That is, the projected image is compressed in the left-right direction. As a result, the aspect ratio of the projected image is adjusted to be vertically long according to the screen. Thus, according to the vertically long fitting priority process, the entire surface of the screen 200 is used as a projection plane.

  It should be noted that an image filled with black is projected in the area indicated by hatching in FIG. That is, only a part of the area that can be projected by the projector 1 is used. Note that in the case of the vertical fitting priority setting, the zoom magnification is larger and the image is projected larger than in the case of the aspect ratio maintenance setting, so that the luminance of the image is relatively lowered. After the vertical fitting priority process, the process proceeds to step S117.

  In step S117, the projection adjustment unit 40 turns the imaging unit 52 off. Thereafter, the process proceeds to step S121. According to the processing from step S104 to step S117, the projector 1 can automatically realize an optimum projection state without any operation by the user.

  On the other hand, when it is determined in step S103 that the automatic adjustment function is not on, the process proceeds to step S118. When the process proceeds to step S118, the projection state is manually adjusted by the user. That is, the adjustment performed in steps S104 to S117 is manually performed by the user. The adjustment method is the same as described above, and focus adjustment by visual observation by the user, and adjustment of the position and posture of the projector 1 and the zoom as described with reference to FIG. 7, for example, are performed.

  In step S <b> 118, the projection adjustment unit 40 determines whether or not an instruction to the effect that the user's manual adjustment has been completed has been input. When the adjustment is not finished, the process repeats step S118 and waits. On the other hand, when it is determined that the end of adjustment has been input, the process proceeds to step S119.

  In step S119, the projection adjustment unit 40 determines whether geometric correction is requested. If geometric correction is not requested, the process proceeds to step S121. On the other hand, when geometric correction is requested, the process proceeds to step S120. In step S120, the projection adjustment unit 40 performs a geometric correction process. In the geometric correction process, the imaging unit 52 performs imaging in a projected state, and the correction parameter determination unit 43 calculates a geometric correction amount based on the captured image and performs geometric correction. Thereafter, the process proceeds to step S121.

  In step S121, the projection adjustment unit 40 ends the projection of the adjustment chart. Thereafter, the projection state adjustment process ends.

  According to the present embodiment, the position and orientation of the projector 1 can be adjusted so as to obtain an optimal projection state. At this time, by using the adjustment chart as shown in FIG. 2, the adjustment amount of each part of the projector 1 can be calculated by one imaging.

  The adjustment chart is not limited to that shown in FIG. For example, it may be as shown in each figure of FIG. In these drawings, the outer frame is indicated by a broken line. As shown in these figures, each side of the outer frame indicated by the broken line has at least one intersection with the line indicated by the solid line. This intersection will be referred to as the first point. In FIG. 2, FIG. 11 (a), (b), (c), (d), (g), (h), one first point is provided on each side. In FIG. 11E, three first points are provided on the upper side and the lower side, and one first point is provided on each of the left side and the right side. In FIG. 11F, two first points are provided on the upper side and the lower side, respectively, and one first point is provided on the left side and the right side.

  From the first point, at least two lines having one end as the first point are provided. In FIG. 2, FIG. 11 (a), (b), (c), (d), (f), (g), (h), about each 1st point, let the 1st point be one end. Two lines are provided. In FIG. 11E, three lines each having the first point as one end are provided for each first point. These lines will be referred to as first lines.

  In FIG. 2, FIG. 11 (a), (d), (e), (f), (g), (h), the first line is a straight line. In FIGS. 11B and 11C, the first line is a curve. In FIG. 2 and FIG. 11 (h), the first line forms a rhombus. In FIGS. 11B and 11C, the first line is a curve. In FIG.11 (c), a 1st line forms an ellipse (arc which becomes a part).

  According to the first line, even if the outer frame is not projected on the screen, the position of the outer frame becomes clear (easily estimated). In addition, since the outer frame is further provided on the adjustment chart, the outer frame can be easily recognized when the outer frame is projected on the screen. Further, horizontal and vertical lines of the projected image are clarified by horizontal and vertical lines such as a cross line indicated by a one-dot chain line. The horizontal and vertical lines are not limited to a cross shape, and may be, for example, a rectangle or a square as shown in FIG.

  According to the adjustment chart having the characteristics as shown in FIG. 11, the same effect as that of the present embodiment can be obtained. The adjustment charts shown in FIGS. 2 and 11 are examples, and the adjustment chart includes at least two first lines having the first point as one end for each of the first points. Sometimes the same effect is obtained.

[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, a plurality of projectors 310 are used. For example, as shown in FIG. 12, a plurality of projectors 310 project images on the same area on the screen 200. As described above, when a plurality of projectors 310 project an image onto the same area, a high projection luminance that cannot be obtained with one projector can be obtained. Such a projection method is also called stack projection.

  For example, as shown in FIG. 13, the projector 310 projects an image on different areas on the screen 200, and a plurality of projectors 310 form one image. In this manner, by forming one image with the plurality of projectors 310, a large image that cannot be obtained with one projector can be obtained with high luminance and high resolution. Such a projection method is also called tiling projection.

  An outline of a configuration example of the projection system 300 including the plurality of projectors 310 is shown in FIG. Although FIG. 14 shows an example in which there are two projectors 310, any number of projectors 310 may be used, and the contents described below can be similarly applied. As shown in FIG. 14, the projection system 300 includes a first projector 311 and a second projector 312. In addition, the projection system 300 includes a video device 320 (projection control device). Then, an image signal (video signal) is input from the video output device 350 to the projection system 300. The video output device 350 is a device that outputs an image to be projected on the screen 200 and may be any device that outputs an image signal. For example, a PC or a video player can be used as the video output device 350. The video output device 350 outputs a video signal to the video device 320.

  The video device 320 includes a video distribution unit 322, a first chart generation unit 324, a second chart generation unit 325, a first geometric correction unit 326, and a second geometric correction unit 327. . The video distributor 322 acquires the image signal output from the video output device 350 and distributes the image signal to the number of projectors 310, that is, two image signals in this example. One of the distributed image signals is input to the first geometric correction unit 326 and the other is input to the second geometric correction unit 327.

  The first chart generation unit 324 and the second chart generation unit 325 output adjustment charts similar to those shown in FIGS. 2 and 11 used in the first embodiment, for example. Information relating to the adjustment chart is stored in the storage unit 332 included in the video device 320. The first adjustment chart output from the first chart generation unit 324 and the second adjustment chart output from the second chart generation unit 325 have, for example, the same shape and different colors. . The first adjustment chart output from the first chart generation unit 324 is input to the first geometric correction unit 326, and the second adjustment chart output from the second chart generation unit 325 is This is input to the second geometric correction unit 327.

  The first geometric correction unit 326 and the second geometric correction unit 327 are similar to those performed by the correction parameter determination unit 43 and the image conversion unit 13 in the first embodiment. Perform geometric correction of the projected image so that it becomes an appropriate rectangle. The video device 320 is connected to the first projector 311 and the second projector 312 by video terminals such as RGB / HDMI, for example. The image signal geometrically corrected by the first geometric correction unit 326 is transmitted to the first projector 311, and the image signal geometrically corrected by the second geometric correction unit 327 is transmitted to the second projector 312. Is done.

  The video device 320 is connected to the first projector 311 and the second projector 312 by a communication cable such as RS232C or USB, and the video device 320 is connected to the first projector 311 and the second projector 312. A control signal is transmitted to. For this reason, the video device 320 includes a first projector control unit 328 that transmits a control signal to the first projector 311 and a second projector control unit 329 that transmits a control signal to the second projector 312. In addition, the video device 320 includes a control unit 334 that controls each unit of the video device 320. The control unit 334 also exhibits the same functions as the adjustment value calculation unit 42 and the correction parameter determination unit 43 according to the first embodiment.

  Further, as described in the first embodiment, when the adjustment is automatically performed, the captured images captured by the imaging units of the first projector 311 and the second projector 312 are acquired with the communication cable. In this manner, the information is passed to the first geometric correction unit 326 and the second geometric correction unit 327 so that appropriate geometric correction is performed.

  The power supply ON / OFF and the like of the video apparatus 320 and the first projector 311 and the second projector 312 may be set so as to be synchronized. That is, when the video device 320 is turned on, the first projector 311 and the second projector 312 can be set to be turned on simultaneously. Similarly, switching of the images of the first projector 311 and the second projector 312 can be performed in common by the video device 320. As described above, the video apparatus 320 controls a plurality of projectors at the same time, so that the user can easily operate the entire projection system 300. When a plurality of projectors are installed on the ceiling or the like, the operation is performed with a remote controller using infrared rays. On the other hand, infrared rays or the like emitted from a remote controller do not always reach a plurality of projectors. Therefore, even in such a case, it is effective that the video apparatus 320 simultaneously controls a plurality of projectors.

  The first projector 311 and the second projector 312 are similar to the projector 1 according to the first embodiment, and project an image onto a projection object such as the screen 200 based on the input image signal. To do. In the present embodiment, the function of the projection adjustment unit 40 in the first embodiment is performed by the video device 320.

  The projection state adjustment process according to this embodiment will be described. The projection state adjustment process according to the present embodiment is also performed in the same manner as the projection state adjustment process according to the first embodiment. However, in the present embodiment, since there are two projectors 310, the position and orientation of the two projectors are adjusted. With reference to the flowchart shown in FIG. 15 and the schematic diagram shown in FIG. 16, the adjustment of the position and orientation of the projector according to the present embodiment and the stack projection adjustment process related to the superimposition of the projection images of a plurality of projectors will be described. To do.

  In step S301, the video device 320 determines the positions of the first projector 311 and the second projector 312 based on the captured image obtained by capturing the screen 200 and the projection images of the first projector 311 and the second projector 312. Calculate the amount of posture adjustment. Here, it is assumed that the positional relationship between the screen 200 and the projection images of the first projector 311 and the second projector 312 is, for example, as shown in FIG. Here, in FIG. 16A, the screen 200 is represented by a broken line, and the first adjustment chart 101 projected by the first projector 311 is represented by a solid line, and is projected by the second projector 312. The second adjustment chart 102 is represented by a two-dot broken line. The same applies to FIGS. 16B to 16F. The first adjustment chart 101 and the second adjustment chart 102 have different colors, for example, and can be identified.

  In step S302, the video apparatus 320 causes the position / orientation adjustment unit 56 of the first projector 311 to perform rotation adjustment based on the adjustment amount calculated in step S301. In step S303, the video device 320 causes the position / orientation adjustment unit 56 of the first projector 311 to perform a neck swing in the left-right direction based on the adjustment amount calculated in step S301. In step S304, the video apparatus 320 causes the position / orientation adjustment unit 56 of the first projector 311 to perform parallel movement in the left-right direction based on the adjustment amount calculated in step S301.

  In step S305, the video apparatus 320 causes the position / orientation adjustment unit 56 of the second projector 312 to perform rotation adjustment based on the adjustment amount calculated in step S301. In step S306, the video apparatus 320 causes the position / orientation adjustment unit 56 of the second projector 312 to perform a neck swing in the left-right direction based on the adjustment amount calculated in step S301. In step S307, the video apparatus 320 causes the position / orientation adjustment unit 56 of the second projector 312 to perform parallel movement in the left-right direction based on the adjustment amount calculated in step S301.

  The relationship between the screen 200 that was initially in the state shown in FIG. 16A and the projected first adjustment chart 101 and the second adjustment chart 102 by the adjustment in steps S302 to S307 is as follows. The state as shown in FIG. That is, the horizontal line of the cross mark of the first adjustment chart 101 and the second adjustment chart 102 is horizontal, the upper side line and the lower side line of the outer frame are horizontal, the vertical line of the cross mark is vertical, The vertical line of the cross mark is positioned at the center of the screen 200 in the left-right direction.

  In step S308, the video device 320 ends the projection by the second projector 312. As a result, the relationship between the screen 200 that was in the state shown in FIG. 16B and the projected adjustment chart is in the state shown in FIG. That is, only the first adjustment chart 101 is projected.

  In step S309, the video apparatus 320 causes the position / orientation adjustment unit 56 of the first projector 311 to perform a vertical swing based on the adjustment amount calculated in step S301. In step S310, the video apparatus 320 causes the lens adjustment unit 54 of the first projector 311 to perform zoom adjustment based on the adjustment amount calculated in step S301.

  FIG. 16D shows the relationship between the screen 200 that has been in the state shown in FIG. 16C and the projected first adjustment chart 101 as a result of the adjustment in steps S309 and S310. It becomes a state. That is, the horizontal line of the cross mark of the first adjustment chart 101 is positioned at the center in the vertical direction of the screen 200, and the upper side line of the outer frame of the first adjustment chart 101 coincides with the upper side of the screen 200. , The lower side line coincides with the lower side of the screen 200.

  In step S311, the video apparatus 320 starts projection by the second projector 312 again. As a result, the relationship between the screen 200 that was in the state shown in FIG. 16D and the projected adjustment chart is in the state shown in FIG.

  In step S312, the video device 320 causes the position / orientation adjustment unit 56 of the second projector 312 to perform a vertical swing based on the adjustment amount calculated in step S301. In step S313, the video apparatus 320 causes the lens adjustment unit 54 of the second projector 312 to perform zoom adjustment based on the adjustment amount calculated in step S301.

  As a result of the adjustments in step S312 and step 313, the relationship between the screen 200 that has been in the state shown in FIG. 16E and the projected adjustment chart is in the state shown in FIG. . That is, the horizontal line of the cross mark of the second adjustment chart 102 is positioned at the center in the vertical direction of the screen 200, and the upper side line of the outer frame of the second adjustment chart 102 matches the upper side of the screen 200. , The lower side line coincides with the lower side of the screen 200. As a result, the first adjustment chart 101 and the second adjustment chart 102 overlap.

  In step S314, the video device 320 causes the geometric correction unit to perform geometric correction based on the adjustment amount calculated in step S301. By this correction, the projection on the screen 200 by the first projector 311 and the second projector 312 is appropriately adjusted. Thereafter, the stack projection adjustment process ends, and the process returns to the projection state adjustment process.

  As described above, according to the stack projection adjustment process, similarly to the first embodiment, the projection on the screen 200 by the first projector 311 and the second projector 312 is appropriately adjusted, and the first projector is adjusted. Projections on the screen 200 by the 311 and the second projector 312 are accurately superimposed.

  Thus, according to the present embodiment, the same effect as that of the first embodiment can be obtained in the stack projection. Further, the same operation can be obtained in the tiling projection as shown in FIG. 13 and the same effect can be obtained.

In FIG. 15, the projection by the second projector 312 is started again in step S311, but at this time, the projection by the first projector 311 may be terminated.
Further, the projection by the second projector 312 may not be performed at the time of adjustment in steps S302 to S304.

[Third Embodiment]
A third 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, a case where the projection state is adjusted by geometric transformation is considered. In the present embodiment, the user adjusts the geometric correction amount using, for example, a cross key. The configuration of the projector 1 according to the present embodiment is the same as that of the first embodiment described with reference to FIG. However, the position / orientation adjustment unit 56 and the electric leg 58 may not be included.

  An example of a projected image and an operation method according to the present embodiment will be described with reference to FIG. In FIG. 17, the broken line represents the screen 200, and the solid line represents the adjustment chart 500 according to the present embodiment. Assume that the positional relationship between the screen 200 and the adjustment chart 500 is, for example, as shown in FIG. 17A before the projection state is adjusted. Here, the outline of the adjustment chart 500 shown in FIG. 17A is a region that can be projected by the projector 1.

  First, the upper left corner of the projection area is adjusted. At this time, as shown in FIG. 17B, the adjustment chart 500 includes a first correction position guide mark 511 indicating that the upper left corner is adjusted, and a first correction indicating the position of the upper left corner. Position mark 512 is included. Here, it is conceivable that the first correction position mark 512 may also serve as a first correction position guide mark indicating that the upper left corner is adjusted, but the projection position of the first correction position mark 512 is the screen 200. When going outside, the user may not be able to recognize the presence of the first correction position mark 512. Therefore, the adjustment chart 500 according to the present embodiment includes a first correction position guide mark 511 indicating that the upper left corner is adjusted near the center of the adjustment chart 500.

  In adjusting the upper left corner of the projection area, the user operates, for example, a cross key. In response to this operation, the chart generation unit 41 performs geometric conversion of the projected adjustment chart and moves the position of the upper left corner. In this way, the projected adjustment chart 500 is adjusted, for example, as shown in FIG. At this time, the image area onto which the adjustment chart 500 is projected is smaller (inside) than the outline of the adjustment chart 500 shown in FIG. That is, the image area is only a part of the projectable area, and the area outside the image area and within the projectable area is not used for projecting the image (a black image is projected). The same applies to the following.

  Next, the upper right corner of the projection area is adjusted. At this time, as shown in FIG. 17D, the adjustment chart 500 includes a second correction position guide mark 521 indicating that the upper right corner is adjusted and a second correction position indicating the position of the upper right corner. And a position mark 522. In adjusting the upper right corner of the projection area, the user operates, for example, a cross key. In response to this operation, the chart generation unit 41 performs geometric conversion of the projected adjustment chart and moves the position of the upper right corner. In this way, the projected adjustment chart 500 is adjusted, for example, as shown in FIG.

  Next, the lower left corner of the projection area is adjusted. At this time, as shown in FIG. 17F, the adjustment chart 500 includes a third correction position guide mark 531 indicating that the lower left corner is adjusted, and a third correction indicating the position of the lower left corner. And a position mark 532. In adjusting the lower left corner of the projection area, the user operates, for example, a cross key. In response to this operation, the chart generation unit 41 performs geometric conversion of the projected adjustment chart and moves the position of the lower left corner. In this way, the projected adjustment chart 500 is adjusted, for example, as shown in FIG.

  Next, the lower right corner of the projection area is adjusted. At this time, as shown in FIG. 17H, the adjustment chart 500 includes a fourth correction position guide mark 541 indicating that the lower right corner is adjusted, and a fourth correction indicating the position of the lower right corner. A position mark 542 is included. In adjusting the lower right corner of the projection area, the user operates, for example, a cross key. In response to this operation, the chart generation unit 41 performs geometric conversion of the projected adjustment chart and moves the position of the lower right corner. In this way, the projected adjustment chart 500 is adjusted, for example, as shown in FIG.

  As described above, according to this embodiment, the first correction position guide mark 511, the second correction position guide mark 521, the third correction position guide mark 531 and the fourth correction position guide mark 541 are adjusted. Since it is displayed near the center of the chart 500, there is little possibility that these guide marks are projected outside the screen. Therefore, the user can always visually recognize these guide marks. As a result, the user can easily recognize which corner is currently being corrected.

  The correction position guide mark and the correction position mark may be any mark, for example, the correction position guide mark 551 and the correction position mark 552 as shown in FIGS. 18A and 18B.

[Fourth Embodiment]
A fourth embodiment will be described. Here, differences from the third embodiment will be described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. In the third embodiment, an example in which the user manually adjusts the image area using the cross key or the like has been described. On the other hand, in this embodiment, the projection adjustment unit 40 of the projector 1 adjusts the image area.

  An example of the adjustment chart according to the present embodiment is shown in FIG. As shown in this figure, the adjustment chart 600 according to the present embodiment includes a cross line 610 representing a diagonal line of the image. Among the cross lines 610, a diagonal line connecting the upper right corner and the lower left corner is referred to as a first cross line 611, and a diagonal line connecting the upper left corner and the lower right corner is referred to as a second cross line 612. By using this cross line 610, a correction method suitable for positioning the four vertices of the image area on the diagonal line of the screen can be obtained. This will be described with reference to FIGS.

  FIG. 20A shows the relationship between the position of the screen 200 before correction and the adjustment chart 600. A solid line indicates the projected adjustment chart 600, and a broken line indicates the screen 200. The same applies to FIG. As shown in FIG. 20A, the cross line 610 of the adjustment chart 600 does not coincide with the diagonal line of the screen 200 before correction. Therefore, the projection adjustment unit 40 performs geometric correction so that the cross line 610 and the diagonal line of the screen 200 coincide with each other. Note that the outline of the adjustment chart 600 before geometric correction coincides with the projectable area.

  Here, attention is paid to the upper right corner of FIG. In converting the upper right position of the adjustment chart 600, it is considered to move the upper right corner to the inside of the adjustment chart 600, that is, to the left side or the lower side. Here, whether the upper right corner is moved to the left side or the lower side can be determined based on whether the first cross line 611 intersects the upper side or the right side of the screen 200. That is, as shown in FIG. 20A, when the first cross line 611 intersects the upper side of the screen 200, if the upper right corner is moved downward, the cross line 610 and the diagonal line of the screen 200 are Can be matched. FIG. 20B shows the relationship between the position of the screen 200 after the geometric transformation so that the cross line 610 and the diagonal line of the screen 200 coincide with each other and the adjustment chart 600. In FIG. 20B, the alternate long and short dash line represents the outline of the adjustment chart 600 before correction, that is, the projectable area.

  Similarly, attention is paid to the lower right corner of FIG. When the lower right position of the adjustment chart 600 is converted, whether the second lower line 612 intersects the lower side or the right side of the screen 200 depends on whether the lower right corner is moved to the left side or the upper side. Can be determined based on whether That is, as shown in FIG. 20A, when the second cross line 612 intersects the lower side of the screen 200, if the lower right corner is moved upward, as shown in FIG. The cross line 610 and the diagonal line of the screen 200 can be matched.

  On the other hand, paying attention to the upper right corner, as shown in FIG. 21A, when the first cross line 611 intersects the right side of the screen 200, if the upper right corner is moved to the left side, FIG. As shown in (b), the cross line 610 and the diagonal line of the screen 200 can be matched. Also, focusing on the lower right corner, when the second cross line 612 intersects the right side of the screen 200, if the lower right corner is moved to the left side, as shown in FIG. And the diagonal line of the screen 200 can be matched.

  Similarly, in order to make the cross line 610 coincide with the diagonal line of the screen 200 by paying attention to the upper left corner, the upper left corner moves downward when the second cross line 612 intersects the upper side of the screen 200. When the second cross line 612 intersects the left side of the screen 200, the upper left corner may be moved to the right side. In order to make the cross line 610 coincide with the diagonal line of the screen 200 by paying attention to the lower left corner, when the first cross line 611 intersects the lower side of the screen 200, the lower left corner is moved upward. What is necessary is just to move the lower left corner to the right side when the first cross line 611 intersects the left side of the screen 200.

  As described above, geometric correction can be performed so that the cross line 610 and the diagonal line of the screen 200 coincide with each other. When the cross line 610 and the diagonal line of the screen 200 coincide with each other, the four corners of the projection area are moved inwardly on the cross line 610 so that the four corners of the projection area are aligned with the four corners of the projection area 200. Corners can be matched.

  Using the above, the projection adjustment unit 40 according to the present embodiment performs geometric correction. The geometric correction process according to the present embodiment will be described with reference to the flowchart of FIG. In step S401, the projection adjustment unit 40 projects the adjustment chart 600. In step S402, the projection adjustment unit 40 causes the imaging unit 52 to capture the projection state and obtains a captured image.

  In step S <b> 403, the projection adjustment unit 40 detects intersections between the cross line 610 and each side of the screen 200 based on the captured image. In step S404, the projection adjustment unit 40 determines the movement direction in the geometric correction for each of the four corners of the image region by the method described with reference to FIGS. Here, when the cross line 610 and the diagonal line of the screen 200 coincide with each other, it is determined that the corner is not moved.

  In step S <b> 405, the projection adjustment unit 40 determines whether or not the cross line 610 and the diagonal line of the screen 200 match for all four corners. When it is determined that all match, the process proceeds to step S407. On the other hand, when it is determined that there is a corner that does not match, the process proceeds to step S406. In step S406, the projection adjustment unit 40 performs geometric conversion by moving a predetermined amount in the direction determined in step S404 for each of the four corners of the projection region by geometric correction. Thereafter, the process returns to step S402.

  In step S <b> 407, the projection adjustment unit 40 performs geometric conversion in which each of the four corners of the image region that do not match the corners of the screen 200 is moved inward along the cross line 610 by a predetermined amount. That is, the four corners of the image area are gradually moved inward. In step S408, the projection adjustment unit 40 causes the imaging unit 52 to capture the projection state and obtains a captured image. In step S409, the projection adjustment unit 40 determines whether or not each of the four corners of the image area matches the corner of the screen 200. When all four corners of the image area coincide with the corners of the screen 200, the geometric correction process ends. On the other hand, when any of the four corners does not match, the process returns to step S407.

  According to the above geometric correction process, the geometric correction is performed by the projection adjustment unit 40 so that the image area and the screen 200 coincide with each other. According to the present embodiment, even when the outline of the adjustment chart 600 is outside the screen 200 and is not projected onto the screen 200, the position of the corner of the adjustment chart 600 is specified, and the adjustment of the geometric conversion is efficient. Can be done well.

In the above embodiment, the projection adjustment unit 40 determines the correction amount of the geometric correction. However, as in the third embodiment, the geometric correction is performed according to the user's operation. May be.
In this case, the user can first determine the direction in which each corner is moved according to how the cross line 610 intersects with the outer side of the screen 200. After matching the diagonal lines, each corner is moved inward on the cross line 610 by an appropriate key operation to which the operation is assigned, so that the corresponding corner of the projection area can be easily set to each corner of the screen 200. Can be matched.
Therefore, the number of operations for adjusting the geometric transformation can be reduced, and the time for adjusting the geometric transformation can be shortened.

At this time, the projection adjustment unit 40 can display the direction to be moved first of the four corners of the image area obtained in the same manner as the geometric correction processing according to the present embodiment, for example, as shown in FIG. . That is, for example, as shown in FIG. 23, when adjustment is performed for the upper left corner, an arrow symbol 702 indicating that the upper left corner only needs to be moved in the right direction may be displayed.
In this way, the user can first know in which direction the corner should be moved (can be moved), reduce the number of operations for adjusting the geometric transformation, Time for adjusting academic conversions can be shortened.

[Fifth Embodiment]
A fifth embodiment will be described. The first to fourth embodiments described above can be used in combination. For example, the projection state is appropriately adjusted by adjusting the position and orientation of the projector 1 using the first embodiment, and cannot be adjusted by, for example, the position and orientation of the projector 1 (exceeding the adjustment range). The distortion of the projected image can be adjusted by geometric correction using the third embodiment or the fourth embodiment. At this time, the adjustment chart is formed by combining the first embodiment and the third embodiment. That is, for example, as shown in FIG. 24, the first correction position guide according to the third embodiment is added to the adjustment chart 100 having the outer frame 110 according to the first embodiment, the rhombus 120, and the cross mark 130. A mark 511 and a first correction position mark 512 are provided. In the adjustment of the position and orientation of the projector 1, the adjustment chart 100 according to the first embodiment shown in FIG. 2 is used, and then the adjustment according to the first embodiment is performed when performing geometric correction. The chart for adjustment 100 according to the third embodiment may be used without using the chart for operation 100.

  The adjustment chart may be formed by combining the first embodiment and the fourth embodiment. That is, for example, as shown in FIG. 25, the adjustment chart 100 according to the first embodiment may be provided with a cross line 610 according to the fourth embodiment.

  The third embodiment and the fourth embodiment can naturally be used for alignment of a plurality of projectors as in the second embodiment. In addition, the combination of the first embodiment and the third embodiment described above, the combination of the first embodiment and the fourth embodiment, the first embodiment, the third embodiment, and the fourth embodiment. The combination with this embodiment can also be used for alignment of a plurality of projectors as in the second embodiment.

  As described above, according to each combination, the effect according to each embodiment can be obtained.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components 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 for projecting an image onto a projection object,
An adjustment chart showing a projectable region, wherein the outline of the projectable region is specified based on the part even if only a part of the adjustment chart is projected onto the projection target A projection apparatus comprising a projection control unit that projects a chart for use.

[2]
The outer shell is rectangular;
When each line segment excluding the vertex of each side of the rectangle is an outline line segment,
The adjustment chart is
A first point provided at least one on each outline line;
For each of the first points, at least two first lines having the first point as one end;
including,
The projection device according to [1].

[3]
The first point is provided for each outline segment, one point,
The first line is a line connecting the first points provided in adjacent outline lines.
Projection apparatus [4] according to [2]
The projection apparatus according to [2] or [3], wherein the first line is a straight line.

[5]
The projection device according to [3], wherein the first line forms part of a rhombus.

[6]
The projection apparatus according to [2] or [3], wherein the first line is a curve.

[7]
The projection device according to [3], wherein the first line forms a part of an ellipse.

[8]
The adjustment chart according to any one of [1] to [7], wherein the adjustment chart further includes a second line indicating the outline.

[9]
The projection apparatus according to any one of [1] to [8], wherein the adjustment chart further includes a straight line representing a horizontal direction and a straight line representing a vertical direction of the projectable region.

[10]
An imaging unit that images the projection object on which the adjustment chart is projected and acquires a captured image;
A projection area changing unit for changing the projectable area;
Adjustment for calculating an adjustment value related to the driving amount of the projection area changing unit for adjusting the positional relationship between the projection target and the projectable area by driving the projection area changing unit based on the captured image A value calculator,
The projection device according to any one of [1] to [9], further including:

[11]
The projection apparatus according to [10], wherein the projection area changing unit includes a zoom mechanism that optically adjusts the size of the projectable area.

[12]
The projection apparatus according to [10] or [11], wherein the projection area changing unit includes a position / orientation adjustment mechanism that changes a position or an attitude of the photographing apparatus in order to change a projection direction.

[13]
The projection apparatus according to any one of [1] to [12], further including an image conversion unit that performs geometric conversion on the image.

[14]
A projection control device that controls a plurality of projection devices that project images toward a projection object,
An adjustment chart showing a projectable region, wherein the outline of the projectable region is specified based on the part even if only a part of the adjustment chart is projected onto the projection target A projection control apparatus comprising: a projection control unit that projects a chart for each of the plurality of projection apparatuses.

[15]
The projection control device according to [14], wherein the projection control unit projects the plurality of projection devices so that the color of the adjustment chart is different.

[16]
[14] or the projection control device according to [15];
A plurality of projection devices controlled by the projection control device;
A projection system comprising:

[17]
The projection system according to [16], wherein the projection control apparatus projects the projection areas of the plurality of projection apparatuses so as to overlap each other.

[18]
[16] The projection control device according to [16], wherein the projection control devices are arranged so that at least a part of the projection areas of the plurality of projection devices are different from each other and form one image by the plurality of projection devices. Projection system.

[19]
A projection state adjustment method for adjusting a projection area on a projection object in a projection apparatus that projects an image on the projection object,
Adjusting the reference angle of the angle of view of the projection area by adjusting the horizontality or verticality of the projection device with respect to the projection object;
The projection device is rotated in the horizontal or vertical direction so that the upper and lower sides of the projection area are horizontal with respect to the projection object, or the left and right sides are perpendicular to the projection object. And a process of
Moving the projection device in a horizontal direction or a vertical direction to adjust a horizontal or vertical position between the projection object and the projection region;
Adjusting the vertical or horizontal position of the projection object and the projection area by rotating the direction of the projection device in the vertical or horizontal direction;
Adjusting the optical system of the projection device to change the size of the projection area;
A projection state adjustment method comprising:

[20]
Deforming the projected area by geometric correction;
[19] The projection state adjustment method according to [19].

  DESCRIPTION OF SYMBOLS 1 ... Projector, 11 ... Input / output connector part, 12 ... Input / output interface, 13 ... Image conversion part, 14 ... Projection process part, 15 ... Micromirror element, 16 ... Light source part, 18 ... Mirror, 20 ... Projection lens, 25 ... CPU, 26 ... main memory, 27 ... program memory, 28 ... operation unit, 29 ... attitude sensor, 30 ... audio processing unit, 32 ... speaker, 40 ... projection adjustment unit, 41 ... chart generation unit, 42 ... adjustment value calculation , 43 ... correction parameter determination unit, 52 ... imaging unit, 54 ... lens adjustment unit, 56 ... position and orientation adjustment unit, 58 ... electric leg unit, SB ... system bus, 310 ... projector, 311 ... first projector, 312 ... second projector, 320 ... video device, 322 ... video distribution unit, 324 ... first chart generation unit, 325 ... second chart generation unit, 326 1st geometry correction part, 327 ... 2nd geometry correction part, 328 ... 1st projector control part, 329 ... 2nd projector control part, 332 ... memory | storage part, 334 ... control part, 350 ... video output apparatus.

Claims (20)

A projection device for projecting an image onto a projection object,
An adjustment chart showing a projectable region, wherein the outline of the projectable region is specified based on the part even if only a part of the adjustment chart is projected onto the projection target A projection apparatus comprising a projection control unit that projects a chart for use. The outer shell is rectangular;
When each line segment excluding the vertex of each side of the rectangle is an outline line segment,
The adjustment chart is
A first point provided at least one on each outline line;
For each of the first points, at least two first lines having the first point as one end;
including,
The projection apparatus according to claim 1. The first point is provided for each outline segment, one point,
The first line is a line connecting the first points provided in adjacent outline lines.
The projection apparatus according to claim 2.   The projection apparatus according to claim 2, wherein the first line is a straight line.   The projection apparatus according to claim 3, wherein the first line forms a part of a rhombus.   The projection apparatus according to claim 2, wherein the first line is a curved line.   The projection apparatus according to claim 3, wherein the first line forms a part of an ellipse.   The projection apparatus according to claim 1, wherein the adjustment chart further includes a second line indicating the outline.   The projection apparatus according to claim 1, wherein the adjustment chart further includes a straight line representing a horizontal direction and a straight line representing a vertical direction of the projectable region. An imaging unit that images the projection object on which the adjustment chart is projected and acquires a captured image;
A projection area changing unit for changing the projectable area;
Adjustment for calculating an adjustment value related to the driving amount of the projection area changing unit for adjusting the positional relationship between the projection target and the projectable area by driving the projection area changing unit based on the captured image A value calculator,
The projection apparatus according to claim 1, further comprising:   The projection apparatus according to claim 10, wherein the projection area changing unit includes a zoom mechanism that optically adjusts a size of the projectable area.   The projection apparatus according to claim 10, wherein the projection area changing unit includes a position / orientation adjustment mechanism that changes a position or an attitude of the photographing apparatus in order to change a projection direction.   The projection apparatus according to claim 1, further comprising an image conversion unit that performs geometric conversion on the image. A projection control device that controls a plurality of projection devices that project images toward a projection object,
An adjustment chart showing a projectable region, wherein the outline of the projectable region is specified based on the part even if only a part of the adjustment chart is projected onto the projection target A projection control apparatus comprising: a projection control unit that projects a chart for each of the plurality of projection apparatuses.   The projection control apparatus according to claim 14, wherein the projection control unit projects the plurality of projection apparatuses so that the color of the adjustment chart is different. A projection control device according to claim 14 or 15,
A plurality of projection devices controlled by the projection control device;
A projection system comprising:   The projection system according to claim 16, wherein the projection control apparatus projects the projection areas of the plurality of projection apparatuses so as to overlap each other.   The projection control device according to claim 16, wherein at least a part of projection areas of the plurality of projection devices are aligned so as to be different from each other, and are projected so as to form one image by the plurality of projection devices. Projection system. A projection state adjustment method for adjusting a projection area on a projection object in a projection apparatus that projects an image on the projection object,
Adjusting the reference angle of the angle of view of the projection area by adjusting the horizontality or verticality of the projection device with respect to the projection object;
The projection device is rotated in the horizontal or vertical direction so that the upper and lower sides of the projection area are horizontal with respect to the projection object, or the left and right sides are perpendicular to the projection object. And a process of
Moving the projection device in a horizontal direction or a vertical direction to adjust a horizontal or vertical position between the projection object and the projection region;
Adjusting the vertical or horizontal position of the projection object and the projection area by rotating the direction of the projection device in the vertical or horizontal direction;
Adjusting the optical system of the projection device to change the size of the projection area;
A projection state adjustment method comprising: Deforming the projected area by geometric correction;
The projection state adjustment method according to claim 19, further comprising:

Images