JP5176448B2 - Projector, projector image adjustment method and program thereof - Google Patents

Description

  The present invention relates to a projector having an image adjustment function, an image adjustment method for the projector, and a program thereof.

2. Description of the Related Art Conventionally, a projector that detects an elevation angle change (decline change) of a projector with respect to a screen using an acceleration sensor or the like and performs keystone distortion correction (trapezoid distortion correction) based on the detection result is known (for example, a patent) Reference 1). This type of projector is convenient because it does not require any special operation by the user because it automatically adjusts the distortion of the projected image on the screen simply by turning on the power.
JP 2001-339671 A

  However, when the projector is installed, not only the elevation angle is changed, but the projector may move in the front-rear direction, the left-right direction, the up-down direction, or rotate in the horizontal direction. However, in order to retain the original projection image with respect to such a change in the position of the projector, it is necessary for the user to manually adjust the image, which causes a problem in usability.

  In view of the above problems, the present invention provides a projector capable of automating image adjustment processing for maintaining the state of an original projection image when the position of the projector is changed, an image adjustment method for the projector, and a program therefor The purpose is to do.

The projector according to the present invention includes an irradiating unit that irradiates a screen with projection light, an instructing unit that gives an instruction at an arbitrary time point, a zoom position by an electric zoom function at a time point instructed by the instructing unit, and a focus by an electric focus function Storage means for storing adjustment data including a position, a shift position by an electric lens shift function, and a correction value by a keystone distortion correction function; and a front-rear direction with respect to the screen from the position of the projector apparatus body at the time indicated by the instruction means; Based on the detection means for detecting the amount of change in position including the amount of movement in the vertical direction and the horizontal direction, the amount of rotation in the horizontal direction, and the amount of change in elevation angle, the detection result of the detection means and the adjustment data stored in the storage means The position of the projected image projected on the screen at And an image adjusting means for performing image adjustment of a projected image using an electric zoom function, an electric focus function, an electric lens shift function, and a keystone distortion correction function so that the shape and size can be maintained. And
The projector described above further includes a distance measuring unit that measures a distance from the apparatus main body to the screen, and the image adjusting unit includes the detection result of the detecting unit, the adjustment data stored in the storage unit, and the measurement result of the distance measuring unit. Based on this, it is preferable to adjust the image of the projection image.
The projector image adjustment method according to the present invention includes an instruction step for giving an instruction at an arbitrary time point, a zoom position by an electric zoom function, a focus position by an electric focus function, and a shift by an electric lens shift function at the time point indicated by the instruction step. A storage step for storing adjustment data including a position and a correction value by a keystone distortion correction function, and a movement amount in the front-rear direction, the up-down direction, and the left-right direction with respect to the screen from the position of the projector device body at the time pointed by the instruction step Based on the detection step for detecting the amount of position change including the amount of rotation in the horizontal direction and the amount of change in elevation angle, and the detection result of the detection step and the adjustment data stored in the storage step, it is projected on the screen at an arbitrary time. Projected image position An image adjustment step for adjusting an image of a projection image using an electric zoom function, an electric focus function, an electric lens shift function, and a keystone distortion correction function so that the shape and size can be maintained. To do.
A program of the present invention causes a computer to execute each step in the projector image adjustment method described above.
The following configuration may be used.
The projector of the present invention includes an irradiating unit that irradiates the screen with projection light, a detecting unit that detects a positional change amount including a moving amount of the apparatus main body in the front-rear direction with respect to the screen, and a detection result of the detecting unit, Image adjustment means for adjusting the image of the projected image so as to hold the position, shape and size of the projected image projected on the screen.

  According to the projector image adjustment method of the present invention, a position change amount including a movement amount of the apparatus main body in the front-rear direction with respect to the screen is detected, and the image is projected on the screen based on the detected position change amount of the apparatus main body. Adjusting the image of the projection image so that the position, shape and size of the projection image can be maintained.

  According to these configurations, when the apparatus main body of the projector is moved in the front-rear direction, image adjustment is performed to maintain the state of the original projection image according to the position change amount (movement amount). There is no need for manual image adjustment. Thereby, the position of the projector can be freely changed according to the state of the installation place of the projector (device main body) and the installation position of the screen, so that even a beginner can easily use it.

  In the projector described above, the image adjustment unit adjusts the size of the projected image using the electric zoom function and the focus adjustment using the electric focus function based on the amount of movement of the apparatus main body in the front-rear direction detected by the detection unit. It is preferable to adjust the position of the projected image using the electric lens shift function.

  According to this configuration, image adjustment can be performed using existing functions (electric zoom function, electric focus function, and electric lens shift function) that are generally installed in projectors. It is possible to suppress an increase in the cost of the apparatus when mounted.

  In the projector described above, the detecting means further detects the amount of movement of the apparatus main body in the vertical and horizontal directions, the amount of rotation in the horizontal direction, and the amount of change in elevation angle as the position change amount of the apparatus main body. Is preferred.

  According to this configuration, all position changes of the projector (device main body) can be allowed. In other words, not only the movement in the front-rear direction with respect to the screen but also the movement in the up-down direction and the left-right direction, the rotation in the horizontal direction, and the elevation angle change can maintain the original projected image state.

  In the projector described above, the image adjustment means adjusts the shape of the projected image using the keystone distortion correction function based on the amount of rotation of the apparatus body in the horizontal direction and the amount of change in elevation angle detected by the detection means. It is preferable.

  According to this configuration, since the shape of the projected image can be adjusted using the keystone distortion correction function, image distortion does not occur due to the horizontal rotation and elevation angle change of the projector.

  In the projector described above, adjustment data that is a correction value by a zoom position by an electric zoom function, a focus position by an electric focus function, a shift position by an electric lens shift function, and a keystone distortion correction function before a position change is detected by a detection unit It is preferable that the image adjustment unit further adjusts the projection image based on the detection result of the detection unit and the adjustment data stored in the storage unit.

According to this configuration, since adjustment data before the position change is detected is stored, the state of the projected image before the position change can be maintained even when the image is adjusted by the electric zoom function or the like before the position change. Can do.
Note that the storage means may be either volatile or nonvolatile.

  The projector described above further includes a distance measuring unit that measures a distance from the apparatus main body to the screen, and the image adjusting unit includes the detection result of the detecting unit, the adjustment data stored in the storage unit, and the measurement result of the distance measuring unit. Based on this, it is preferable to adjust the image of the projection image.

  According to this configuration, since the image adjustment of the projection image is performed based on the measurement result of the distance measuring unit, the state of the projection image can be held more accurately. For example, even when the movement distance is the same in the front-rear direction, the image adjustment for maintaining the original projection image is performed when the distance is 2 m → 1 m from the screen and when the distance is 6 m → 5 m from the screen. Therefore, by performing image adjustment processing based on the distance to the screen, the state of the original projection image can be more accurately maintained.

  In the projector described above, it is preferable that the projector further includes instruction means for giving an instruction at an arbitrary time, and the detection means detects a position change amount from the position of the apparatus main body at the time indicated by the instruction means.

  According to this configuration, the user can hold the state of the projection image by giving an instruction when a desired projection image is projected on the screen.

  A program according to the present invention is for causing a computer to execute each step in the projector image adjustment method described above.

  By using this program, it is possible to automate image adjustment processing for maintaining the state of the original projection image when the position of the projector is changed.

  Hereinafter, a projector, an image adjustment method for the projector, and a program thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing the configuration of the projector 10. As shown in the figure, the projector 10 includes an illumination optical system 27, a liquid crystal light valve 28, and a projection optical system 29 as an optical system (irradiation means) that irradiates the screen SC with projection light. Yes. In addition, the projector 10 includes a light source lamp drive unit 21, a liquid crystal light valve drive unit 22, a projection optical system adjustment unit 23, a shift position detection unit 24, and a zoom position detection unit as components related to these optical systems. 25 and a focus position detection unit 26.

  Further, the projector 10 includes, as other components, a CPU (Central Processing Unit) 31 that is a central processing unit, an image input unit 32, an operation unit 33 (instruction means), an image processing unit 34, and an acceleration sensor. 35 (detection means), a distance sensor 36 (distance measurement means), and a storage unit 37 (storage means). Among these, the components 21 to 26 and the components 32 to 37 are connected to the CPU 31 via the bus 39.

  The “image adjusting unit” according to the claims includes the CPU 31, the projection optical system adjusting unit 23, and the image processing unit 34 as main components. That is, when the position of the projector 10 changes, the CPU 31, the projection optical system adjustment unit so that the position, shape, and size of the projection image G projected on the screen SC can be maintained as they were before the position change. 23 and the image processing unit 34 perform image adjustment processing.

  The light source lamp driving unit 21 drives a light source lamp included in the illumination optical system 27. The light source lamp may be a discharge light emitting type or a self light emitting element (such as a light emitting diode). The liquid crystal light valve driving unit 22 drives the liquid crystal light valve 28 that is an image forming element based on the image data processed by the image processing unit 34.

  The projection optical system adjustment unit 23 has a motor and adjusts the position of the projection lens included in the projection optical system 29. The projection lens is configured as a combined lens in which a plurality of lenses such as a zoom lens and a focus lens are accommodated in a cylindrical lens barrel.

  Specifically, the projection optical system adjustment unit 23 adjusts the shift position of the projection optical system 29 by moving the projection lens in a direction orthogonal to the light source optical axis LA (electric lens shift function). Further, the projection optical system adjustment unit 23 moves the zoom lens included in the projection lens in a direction parallel to the light source optical axis LA by rotating a zoom ring that supports the zoom lens. (Electric zoom function) Further, the projection optical system adjustment unit 23 moves the focus lens included in the projection lens in a direction orthogonal to the light source optical axis LA by changing the focus ring that supports the focus lens (changes the relative positions of the plurality of lenses). ) To adjust the focus position of the projection optical system 29 (electric focus function). The light source optical axis LA refers to the central axis of light emitted from the illumination optical system 27 and passes through the center of the effective display area (image forming surface) of the liquid crystal light valve 28.

  The shift position detection unit 24 detects the shift position of the projection optical system 29. The zoom position detection unit 25 detects the zoom position of the projection optical system 29. Further, the focus position detection unit 26 detects the focus position of the projection optical system 29. The detection results of each of these detection units (shift position detection unit 24, zoom position detection unit 25, and focus position detection unit 26, hereinafter collectively referred to as “projection detection unit 20”) are the images obtained by the projection optical system adjustment unit 23. Used for adjustment. As the projection detection unit 20, a known position detection unit such as a rotary encoder or a variable resistor can be applied.

  The image input unit 32 acquires image data from an external storage medium such as a memory card MC. In this case, the image input unit 32 includes a memory card slot that reads image data. The image input unit 32 can also acquire image data from an external device such as a personal computer 47 or a video recorder 48. In this case, the image input unit 32 includes an interface that receives RGB signals output from the personal computer 47 and composite signals output from the video recorder 48.

  The operation unit 33 is operated by the user, and includes a power button and a key group for performing various settings (contrast setting, color correction, environment setting, etc.). The key group includes an image adjustment execution key 44 for executing an image adjustment function at an arbitrary time. When the image adjustment execution key 44 is pressed when a desired projection image G is projected on the screen SC, the state of the desired projection image G (position, shape and size of the projection image G) is maintained. (Details will be described later).

  The image processing unit 34 has a keystone distortion correction unit 45 and executes predetermined image processing based on an image processing program. The keystone distortion correction unit 45 corrects image distortion caused by rotation of the projector 10 in the horizontal direction and elevation angle change. For example, when the projector 10 performs the projection, if an image without distortion is formed on the liquid crystal light valve 28, the projected image G on the screen SC is distorted into a substantially trapezoidal shape. Therefore, if an image distorted in a substantially trapezoidal shape (a reverse image of the projected image G projected on the screen SC) is formed on the liquid crystal light valve 28, an image without distortion (a rectangular image having a correct aspect ratio) is formed on the screen SC. ) Can be projected. That is, the keystone distortion correction unit 45 performs a process of generating the corrected image data in accordance with the image adjustment process.

  The acceleration sensor 35 detects the amount of change in the position of the projector 10 (device main body 11) from when the image adjustment execution key 44 is pressed. As the acceleration sensor 35, any of a piezoelectric type, a semiconductor strain gauge type, and a servo type may be used. In the present embodiment, acceleration sensors 35 are mounted at a plurality of locations of the apparatus main body 11, and the CPU 31 performs the front-rear direction, the vertical direction, and the left-right direction of the apparatus main body 11 based on the measurement values output from each acceleration sensor 35. , The amount of rotation in the horizontal direction, and the amount of change in elevation angle are detected. Note that “front-rear direction”, “vertical direction”, “left-right direction”, “horizontal direction”, and “elevation angle” refer to changes in the position of the projector 10 with respect to the screen SC, and FIG. The plan view is as shown in FIG. 3 and the plan view of the projector 10 as viewed from the top. In both figures, reference numeral 50 indicates an installation base on which the projector 10 is installed.

  The distance sensor 36 is provided in the vicinity of the projection lens, and measures the distance from the projector 10 to the screen SC. The distance sensor 36 is used for the image adjustment process. For example, the original projection image G is maintained when the distance is 1 m → 2 m from the screen SC and when the distance is 5 m → 6 m from the screen SC even at the same movement distance in the front-rear direction. It is necessary to vary the image adjustment amount. Therefore, by performing image adjustment processing using the distance from the projector 10 to the screen SC as one parameter, the original projection image G can be more accurately held. As the acceleration sensor 35, either a laser type using a semiconductor laser or a pulse laser, or an ultrasonic type may be used.

  The storage unit 37 stores adjustment data that is a detection result of the projection detection unit 20 and a correction value of the keystone distortion correction unit 45 at the time when the image adjustment execution key 44 is pressed (before position detection by the acceleration sensor 35). . If the adjustment data changes due to the image adjustment process, the adjustment data is updated as needed. Further, the storage unit 37 can read after turning on the power by holding the adjustment data before turning off the power. That is, the storage unit 37 of the present embodiment is premised on being rewritable and nonvolatile. The storage unit 37 may be updated periodically after the image adjustment execution key 44 is pressed, or may be performed in conjunction with the movement detection of the projector 10.

  With the above configuration, when the image adjustment execution key 44 is pressed, the CPU 31 stores the adjustment data at that time in the storage unit 37. Thereafter, when a change in the position of the projector 10 is detected from the detection result of the acceleration sensor 35, the image adjustment execution key 44 is based on the adjustment data read from the storage unit 37, the position change amount, and the detection result of the distance sensor 36. An image adjustment process is performed to reproduce the projected image G that is considered to have been projected at the time when is pressed. That is, the projected image G projected on the screen SC is held in the state at the time when the image adjustment execution key 44 is pressed. With this configuration, even if the position of the projector 10 is changed according to the state of the installation location of the projector 10 and the installation position of the screen SC, the image adjustment process is automatically executed, so that the original projection image G is reproduced. Therefore, even a beginner can easily use the image without manually adjusting the image. Note that the original projected image G is not necessarily a rectangular region, but may be an image distorted in a substantially trapezoidal shape, and the size and display state are not limited.

  Next, a specific example of the image adjustment process will be described with reference to FIGS. 4 and 5. Here, a case where the projector 10 is moved in the front-rear direction with respect to the screen SC is illustrated. FIG. 4A is a plan view of the projector 10 installed at a position (position: L1) separated from the screen SC by the distance L1, and a screen on which the projection image G1 is projected by irradiation of the projector 10. FIG. 4B is a plan view of the projector 10 installed at a position separated from the screen SC by a distance L2 (position: L2) as viewed from above, and projected by irradiation of the projector 10. It is a front view of the screen SC on which the image G2 is projected.

  For example, when the image adjustment function is not executed, as shown in FIG. 5A, a projection image (desired projection image) G1 composed of a predetermined rectangular area is projected on the screen SC (position: L1). ) When the projector 10 is moved backward (see arrow 61) (position: L2), as shown in FIG. 5B, a projection image G2 having a display area wider than the projection image G1 is displayed on the screen SC. Projected. The position change amount (movement amount) at this time is L2−L1 = ΔL. On the other hand, as shown in FIG. 5A, when the image adjustment function is executed in a state where the projection image G1 composed of a predetermined rectangular area is projected on the screen SC (position: L1), the projector 10 Is moved backward (see arrow 61) (position: L2), the projected image G1 is projected on the screen SC by the image adjustment processing.

  While the projector 10 moves from the state shown in FIG. 5A to the state shown in FIG. 5B, the image adjustment processing is repeatedly executed according to the position of the projector 10 that changes every moment and the distance from the screen SC. By doing so, the projected image G1 may be continuously projected on the screen SC. However, since the image adjustment processing actually takes time, the position change amount is detected every predetermined time and stepwise. The projection image G2 is changed to the projection image G1. If the image adjustment process takes a long time due to the performance of the CPU 31 or the like, the projector 10 is moved backward (see arrow 61), and then the projection image G2 is changed to the projection image G1 over a predetermined time. Alternatively, the projection may be interrupted after the projector 10 is moved (the projection image G is not displayed), and the projection image G1 after the image adjustment processing may be displayed after a predetermined time.

  FIG. 5 shows various parameters that change as the projector 10 shown in FIG. 4 moves. For example, adjustment data including the detection result of the projection detection unit 20 at the position: L1 (the zoom position by the electric zoom function when the projector 10 is positioned at the position: L1 and projects the projection image G1, the electric focus function When the focus position by the motor, the shift position by the electric lens shift function, and the correction value by the keystone distortion correction function) are B1, the adjustment data B1 is stored with the depression of the image adjustment execution key 44 as a trigger. Store in the unit 37. Here, when the projector 10 is moved (position change amount: ΔL), the adjustment data becomes B2 at the position: L2 by the image adjustment process. At this time, the adjustment data: B2 is a predetermined parameter using the adjustment data: B1 when the image adjustment execution key 44 is pressed, the position change amount: ΔL, and the distance (L2) from the screen SC at the position: L2. It is calculated based on the algorithm. The calculated adjustment data B2 is stored in the storage unit 37.

  Further, when the power is turned OFF / ON in the position of L2 (a state where adjustment data: B2 is stored), the adjustment data: B2 is read from the storage unit 37, and the projection image G1 is projected based on the adjustment data. To do. As a result, when the projection is resumed in the place where it was installed before the power was turned off, a desired projection image (projection image G1) can be projected. When projection is resumed at a place different from the place where the power was turned off, the adjustment data stored in the storage unit 37 can be erased by a predetermined operation for resetting the adjustment data. It can be done.

  Next, the processing of the projector 10 when the image adjustment function is executed will be described with reference to the flowcharts of FIGS. Here, the CPU 31 will be mainly described. As shown in FIG. 6, when the execution of the image adjustment function is instructed by operating the image adjustment execution key 44 (S01), the adjustment data at that time is stored in the storage unit 37 (S02). Here, based on the output value of the acceleration sensor 35, it is determined whether or not there is a position change (S03). If there is a position change (S03: Yes), the position change amount and the value of the distance sensor 36 are determined. Detect (S04). Then, image adjustment processing is performed based on the adjustment data stored in S02 and the detection value in S04 (S05).

  Next, FIG. 7 is a subroutine of image adjustment processing corresponding to S05 of FIG. As shown in FIG. 7, the CPU 31 determines whether or not the position change amount detected in S04 includes the amount of movement in the front-rear direction according to the output value of the acceleration sensor 35 (S51). That is, when there is a movement in the front-rear direction (S51: Yes), the projection optical system adjustment unit 23 performs a predetermined image adjustment. Specifically, based on the amount of movement in the front-rear direction, adjustment of the projection size of the projection image G by the electric zoom function, focus adjustment of the projection image G by the electric focus function, and projection position of the projection image G by the electric lens shift function Adjustment is performed (S52).

  Subsequently, it is determined whether or not the position change amount detected in S04 includes a vertical or horizontal movement amount (S53). That is, when there is a movement in at least one of the vertical direction and the horizontal direction (S53: Yes), the projection optical system adjustment unit 23 performs a predetermined image adjustment. Specifically, the projection position of the projection image G is adjusted by the electric lens shift function based on the vertical or horizontal movement amount (S54).

  Subsequently, it is determined whether or not the position change amount detected in S04 includes a horizontal rotation amount (S55). That is, when the image is rotated in the horizontal direction (S55: Yes), correction by the image processing unit 34 (keystone distortion correction unit 45) and image adjustment by the projection optical system adjustment unit 23 are performed. Specifically, based on the amount of rotation in the horizontal direction, the projection shape of the projection image G is adjusted by the lateral keystone distortion correction, and the projection position of the projection image G is adjusted by the electric lens shift function (S56).

  Further, it is determined whether or not the position change amount detected in S04 includes the elevation angle change amount (S57). That is, when there is a change in elevation angle or depression angle (S57: Yes), correction by the image processing unit 34 (keystone distortion correction unit 45) and image adjustment by the projection optical system adjustment unit 23 are performed. Specifically, based on the amount of change in elevation angle, the projection shape of the projection image G is adjusted by vertical keystone distortion correction, and the projection position of the projection image G is adjusted by the electric lens shift function (S58).

  In addition, the execution order of each process in the image adjustment process shown in FIG. 7 is arbitrary. If there is a change in position in two or more directions, the image adjustments in S52, S54, S56, and S58 may be executed simultaneously.

  In FIG. 7, the image adjustment processing is performed based on the five position changes of the front-rear direction, the up-down direction, the left-right direction, the horizontal rotation, and the elevation angle, but only for the movement in the front-rear direction and the up-down direction. It is not always necessary to perform image adjustment processing based on all five position changes of the projector 10, such as performing image adjustment for holding the original projection image G. Further, it may be configured so that the user can select and set the position change to be subjected to the image adjustment processing from among the above five.

  As described above, according to the present embodiment, since the image adjustment for maintaining the state of the original projection image G is performed according to the position change amount of the projector 10, the user needs to manually perform the image adjustment. There is no. Thereby, the position of the projector can be freely changed according to the state of the installation location of the projector 10 (device main body 11) and the installation position of the screen SC, so that even a beginner can easily use it. .

  Further, the image adjustment processing can be performed using existing functions (electric zoom function, electric focus function and electric lens shift function, keystone distortion correction function) that are generally installed in the projector 10. Therefore, an increase in apparatus cost when the image adjustment function of the present invention is installed can be suppressed.

  Also, since adjustment data before execution of the image adjustment function (before position change detection) is stored, the state of the projected image G before the position change can be obtained even when image adjustment is performed by an electric zoom function or the like before the position change. Can be held accurately. Furthermore, since the image adjustment process is performed in consideration of the distance from the projector 10 to the screen SC, the state of the original projection image G can be held more accurately.

  In the above embodiment, as the image adjustment process, correction by the image processing unit 34 and image adjustment by the projection optical system adjustment unit 23 are performed. However, using these functions causes a limit of image adjustment. (For example, the limit of the zoom position or the focus position). Therefore, when the position of the projector 10 changes beyond that limit, if the position of the projector 10 is further changed by generating an electronic sound or the like, an image adjustment process for holding the original projection image G is performed. It is preferable to notify the user that it cannot be executed. According to this configuration, the user can change the position of the projector 10 within a range where the image adjustment process can be performed. In addition to the image adjustment processing means shown in the above embodiment, the original projection image G may be held by performing known image processing.

  Further, in the above embodiment, the adjustment data after the position change is calculated using the distance in the front-rear direction to the screen SC as one of the parameters. The position in the direction may be measured, and the adjustment data after the position change may be calculated using the measurement result. According to this configuration, the state of the original projection image G can be held more accurately.

  In the above-described embodiment, when the position change of the projector 10 is detected, the image adjustment process is performed based on the adjustment data read from the storage unit 37, the position change amount, and the detection result of the distance sensor 36. However, the use of the adjustment data and the detection result of the distance sensor 36 is not an absolute condition, and it is naturally possible to perform the image adjustment processing based only on the position change amount.

  In the above-described embodiment, the image adjustment function is executed by pressing the image adjustment execution key 44 as a trigger. However, a change in the position of the projector 10 may be used as a trigger. In this case, it is preferable to perform the image adjustment processing when the position change of the projector 10 is stopped (when the predetermined time has elapsed since the position change has disappeared). According to this configuration, it is possible to save the user from having to operate the image adjustment execution key 44.

  In addition, an image adjustment mode in which image adjustment processing (correction by the image processing unit 34 and image adjustment by the projection optical system adjustment unit 23) is performed in accordance with all position changes of the projector 10, and the horizontal rotation and elevation angle of the projector 10 are performed. The normal mode for performing the keystone distortion correction process (correction by the image processing unit 34) can be switched in accordance with the change of the image, and when the image adjustment execution key 44 is not pressed, the mode is switched to the image adjustment mode. The adjustment data may be stored. According to this configuration, the operation is easy for a user who is used to the conventional keystone distortion correction function.

  Moreover, it is possible to provide each component of the projector 10 shown in said embodiment as a program. Further, the program can be provided by being stored in various recording media (CD-ROM, flash memory, etc.). That is, a program for causing a computer to function as each unit of the projector 10 and a recording medium on which the program is recorded are also included in the scope of the right of the present invention.

  In the above embodiment, a liquid crystal display method is adopted, but a display principle such as a CRT display method or a light switch display method (micromirror device method) is not limited. Other modifications can be made as appropriate without departing from the scope of the present invention.

It is a block diagram of the projector which concerns on one Embodiment of this invention. It is the top view which looked at the projector from the side. It is the top view which looked at the projector from the upper surface. It is a figure which shows the positional change amount and the change of a projection image when a projector is moved to the front-back direction with respect to a screen. It is a figure which shows the parameter which changes with the movement of a projector. It is a flowchart which shows the process of the projector at the time of performing an image adjustment function. It is a flowchart which shows an image adjustment process.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Projector 11 ... Apparatus main body 20 ... Projection detection part 23 ... Projection optical system adjustment part 31 ... CPU 33 ... Operation part 34 ... Image processing part 35 ... Acceleration sensor 36 ... Distance sensor 37 ... Memory | storage part 44 ... Image adjustment execution key 45 ... Keystone distortion correction part G ... Projected image SC ... Screen

Claims (4)

Irradiating means for irradiating the screen with projection light;
An instruction means for giving an instruction at an arbitrary time;
Storage means for storing adjustment data including a zoom position by the electric zoom function, a focus position by the electric focus function, a shift position by the electric lens shift function, and a correction value by the keystone distortion correction function at the time point instructed by the instruction means; ,
Wherein from the position of the projector main body at the time instructed by the instruction means, the direction after pre against the screen, the movement amount in the vertical and horizontal directions, the rotation amount in the horizontal direction, as well as the position changes including a change of elevation angle Detecting means for detecting the amount;
Based on the detection result of the detection means and the adjustment data stored in the storage means, the electric zoom so that the position, shape and size of the projected image projected on the screen at the arbitrary time can be maintained. A projector comprising: an image adjustment unit configured to perform image adjustment of the projected image using the function, the electric focus function, the electric lens shift function, and the keystone distortion correction function . Further comprising distance measuring means for measuring a distance from the apparatus main body to the screen;
It said image adjustment means, a detection result of said detecting means, according to claim 1, based on the measurement result the adjustment data and the distance measuring means is stored in the storage means, and performing an image adjustment of the projection image Projector. An instruction step for giving an instruction at an arbitrary time;
A storage step for storing adjustment data including a zoom position by the electric zoom function, a focus position by the electric focus function, a shift position by the electric lens shift function, and a correction value by the keystone distortion correction function at the time point instructed by the instruction step; ,
Wherein from the position of the projector main body at the time instructed by the instruction step, after prior against the screen direction, the movement amount in the vertical and horizontal directions, the rotation amount in the horizontal direction, and the position change amount, including the amount of change in the elevation angle A detecting step for detecting
Based on the detection result of the detection step and the adjustment data stored in the storage step, the electric zoom so that the position, shape and size of the projected image projected on the screen at the arbitrary time can be maintained. An image adjustment method for a projector, comprising: an image adjustment step for performing image adjustment of the projected image using the function, the electric focus function, the electric lens shift function, and the keystone distortion correction function . The program for making a computer perform each step in the image adjustment method of the projector of Claim 3 .

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