JP4867154B2 - Projection apparatus, projection setting method, and program - Google Patents

Description

  The present invention relates to a projection apparatus having an automatic trapezoidal correction function, a projection setting method, and a program.

  There is a projection device called a projector device, a data projector, or the like that has a function of correcting trapezoidal distortion caused by the fact that the device and the screen do not face each other.

As one of the projection devices with this type of trapezoidal correction function, it is determined whether or not the range over which the trapezoidal distortion can be corrected is exceeded from the projection angle of the projection optical system and the installation angle of the device obtained by the acceleration sensor. When the range is exceeded, a technique is considered in which the contents of installation adjustment, specifically, video and audio for prompting adjustment of the length of the apparatus leg are output. (Patent Document 1)
JP 2004-029110 A

  However, the technique described in Patent Document 1 uses an acceleration sensor to detect only the vertical component, specifically the elevation angle component of the projection optical axis, as the installation state of the apparatus. It is determined from the projection angle of view whether or not it is within a range where trapezoidal correction for the screen is possible.

  In this case, as is clear from the fact that the right-angle symbols are frequently used in the descriptions of FIGS. 5 to 9 in the same document, the installation position of the apparatus is horizontal, and the screen to be projected is stretched vertically. It is assumed that the horizontal component of the projection optical axis with respect to the screen is at least a right angle and that it is not necessary to correct the trapezoidal distortion in the left-right direction. It is determined whether or not correction is possible.

  Therefore, if even one of the above-mentioned preconditions is not satisfied in the actual installation environment of the projector apparatus, it is impossible to make an accurate determination, and it is difficult to consider that the technique is very feasible.

The present invention has been made in view of the above circumstances, and its purpose is to accurately grasp the relative positional relationship between the projection apparatus and the projection target screen and determine whether trapezoidal correction is possible. An object of the present invention is to provide a projection apparatus, a projection setting method, and a program capable of promptly returning the determination result to the user and performing appropriate processing by making an appropriate determination.

The invention described in claim 1 is a projection device, which is obtained by a projection unit that projects an image, a distance measurement unit that measures a distance from the projection unit to a plurality of positions on a projection target surface, and the distance measurement unit. The calculation means for calculating the relative positional relationship between the apparatus and the projection target surface according to the distances to the plurality of positions, the positional relationship obtained by the calculation means, and the angle range information set in advance are used for trapezoidal correction. It is characterized by comprising judging means for judging propriety and output means for outputting a notification for encouraging manual trapezoidal correction when the judging means judges that automatic keystone correction is impossible.
According to a second aspect of the present invention, in the first aspect of the present invention, when the determination unit determines that the keystone correction cannot be performed, the output unit performs notification output that prompts the user to change the installation without correcting the keystone. It is characterized by that.

According to a third aspect of the present invention, in the first or second aspect of the invention, the determining means determines whether or not the keystone correction is possible based on the angle range information in a plurality of stages related to the keystone correction, and the output means The notification output is performed step by step based on the determination result of the determination means.

The invention described in claim 4 is the invention described in claim 3 , characterized in that the angular range information of the plurality of stages relates to range information of automatic trapezoidal correction and manual trapezoidal correction.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the distance measuring unit is a distance to a plurality of positions in a state where a predetermined chart image is projected by the projecting unit. Is measured.

A sixth aspect of the present invention is the invention according to any one of the first to fifth aspects, wherein the determining means calculates the positional relationship between the apparatus and the projection target surface calculated by the calculating means within a maximum projectable range. It is characterized by determining whether it is over.
The invention according to claim 7 is the invention according to claim 6 , wherein the output means determines that the positional relationship between the apparatus and the projection target surface exceeds the maximum projectable range. A notification output that prompts the user to change the installation position is performed without performing focusing processing or keystone correction .
Invention according to claim 8, determines that in the invention of any one claim of the claims 1 to 7, further comprising a row of cormorants automatic keystone correction means automatic keystone correction process, the determination means can be automatic keystone correction In this case, after the automatic keystone correction means performs automatic keystone correction processing and the automatic focusing means performs automatic focusing processing, the output means informs the user that automatic keystone correction and automatic focusing processing have been completed. Notification output is performed.
The invention according to claim 9 is the invention according to any one of claims 1 to 8, wherein the output means performs the notification output by amplifying sound by voice together with projection display of a guide message. Features.

A tenth aspect of the present invention is a projection setting method for a projection apparatus, comprising: a projection unit that projects an image; and a distance measurement unit that measures a distance from the projection unit to a plurality of positions on a projection target surface. A calculation process for calculating the relative positional relationship between the apparatus and the projection target surface based on the distances to a plurality of positions obtained by the distance unit, a positional relationship obtained in this calculation process, and preset angle range information Judgment process for determining whether or not keystone correction is possible, and if it is determined that automatic keystone correction cannot be performed in this determination process, it is determined that an output process for informing output for prompting manual keystone correction , and that this determination process cannot be performed for automatic keystone correction. And an automatic focusing process for performing an automatic focusing process based on the distance measured by the distance measuring unit .

The invention described in claim 11 is a program executed by a computer incorporated in a projection apparatus including a projection unit that projects an image and a distance measurement unit that measures distances to a plurality of positions on a projection target surface by the projection unit. The calculation step for calculating the relative positional relationship between the apparatus and the projection target surface based on the distance to the plurality of positions obtained by the distance measuring unit, and the positional relationship obtained in the calculation step are set in advance. and a determination step of determining whether the keystone correction by the angular range information, if it is determined not to be automatic keystone correction in this determination step, an output step for performing notification output to prompt a manual keystone correction, auto keystone the determination step If it is judged not to be corrected, based on the distance measured by the distance measuring unit, that to execute the automatic focusing step of performing automatic focusing process on the computer And butterflies.

According to the present invention, the relative positional relationship between the projection device and the projection target screen is accurately grasped , and the judgment result is promptly returned to the user by appropriately judging whether or not the keystone correction is possible. At the same time, appropriate processing can be performed.

  Hereinafter, an embodiment in which the present invention is applied to a projector apparatus will be described with reference to the drawings.

  FIG. 1 shows an external appearance configuration of mainly a front surface and an upper surface of a housing of a projector device 10 according to the embodiment. As shown in the figure, a projection lens 12, a distance measuring sensor 13, and an Ir receiver 14 are disposed on the front surface of a rectangular parallelepiped main body casing 11.

  The projection lens 12 is for projecting a light image formed by a spatial light modulation element formed of a micromirror element, which will be described later, onto an object such as a screen, and here, a focus position and a zoom position (projection angle of view). Is arbitrarily variable.

  The distance measuring sensor 13 is arranged in a direction orthogonal to each other so that one of the two pairs of phase difference sensors is in the horizontal direction and the other is in the vertical direction. The distance to the light / dark pattern is measured along a one-dimensional detection line.

  The Ir receiver 14 receives an infrared light (Ir) signal on which a key operation signal from a remote controller of the projector device 10 (not shown) is superimposed.

A key switch portion 15 and a speaker 16 are disposed on the upper surface of the main body casing 11.
The key switch unit 15 includes, for example, a power key, AF / AK (Automatic Focus / Automatic Key-stone correction) key, zoom key, input selection key, cursor (“↑”, “↓”, “←”). The “→”) key, the “Enter” key, and the like, and similar keys are also arranged on a remote controller (not shown) of the projector device 10.

  The speaker 16 emits a sound of the input audio signal and a beep sound during operation.

Although not shown, an input / output connector portion, an Ir receiving portion, and an AC adapter connecting portion are disposed on the back surface of the main casing 11.
The input / output connector unit includes, for example, a USB terminal for connection to an external device such as a personal computer, a mini D-SUB terminal for video input, an S terminal, an RCA terminal, a stereo mini terminal for audio input, and the like. .

Similar to the Ir receiver 14, the Ir receiver receives an infrared light (Ir) signal on which a key operation signal from a remote controller (not shown) is superimposed.
The AC adapter connection unit connects a cable from an AC adapter (not shown) serving as a power source.

  Next, the functional configuration of the electronic circuit of the projector apparatus 10 will be described with reference to FIG. In the figure, image signals of various standards input from the input / output connector unit 21 are unified into image signals of a predetermined format by the image conversion unit 23 via the input / output interface (I / F) 22 and the system bus SB. Later, it is sent to the projection encoder 24.

  The projection encoder 24 develops and stores the transmitted image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the projection drive unit 26.

  The projection driving unit 26 appropriately speeds up the time division driving by multiplying a frame rate, for example, 30 [frames / second], the number of color component divisions, and the number of display gradations in accordance with the transmitted image signal. For example, the micromirror element 27 which is a spatial light modulation element (SOM) is driven to display.

  High-luminance white light emitted from the light source lamp 29 disposed in the reflector 28 is appropriately colored to the primary color via the color wheel 30 and irradiated through the integrator 31 and the mirror 32 to the micromirror element 27. As a result, an optical image is formed by the reflected light, and is projected and displayed on a screen (not shown) through the projection lens 12.

  However, both the lighting drive of the light source lamp 29 and the motor (M) 33 that rotationally drives the color wheel 30 operate based on the supply voltage value from the projection light processing unit 34.

  The control unit 35 controls all the operations of the above circuits. The control unit 35 includes a CPU, a non-volatile memory storing an operation program executed by the CPU including processing for initial setting of a projection operation described later, a work memory, and the like.

  The control unit 35 is also connected to a distance measurement processing unit 36 and an audio processing unit 37 via the system bus SB.

  The distance measurement processing unit 36 controls and drives the distance measurement sensor 13 composed of the two pairs of phase difference sensors, and calculates the distance from the detected output to an arbitrary point position. The calculated distance value data is It is sent to the control unit 35.

  The sound processing unit 37 includes a sound source circuit such as a PCM sound source, converts the sound data given during the projection operation into an analog signal, drives the speaker 16 to emit a loud sound, or generates a beep sound if necessary.

  Each key operation signal in the key switch (SW) unit 15 is directly input to the control unit 35, and a signal from the Ir receiving unit 38 is also directly input. The Ir receiving unit 38 includes the Ir receiving unit 14 and an Ir receiving unit provided on the back side of the main body casing 11, converts the infrared light reception signal into a code signal, and sends the code signal to the control unit 35.

Next, the operation of the above embodiment will be described.
FIG. 3 shows the specific processing contents of the initial setting operation program executed by the control unit 35 in response to the operation of the key switch unit 15 or the “AF / AK” key of the remote controller.

  Initially, the control unit 35 measures the distances to a plurality of positions within the projection range (step M01).

  FIG. 4A is a subroutine showing the processing contents of the distance measurement of the plurality of positions. Initially, the horizontal chart image HC shown in FIG. 4B is projected and displayed by the projection system including the projection lens 12. (Step S01).

The horizontal chart image HC is composed of three point images arranged at equal intervals so as to fill the entire projection range PA in the horizontal direction.
In a state where the horizontal chart image HC is projected and displayed, the distance “LC” to the projected image position of the point located at the center is measured by the distance measurement sensor 13 and the distance measurement processing unit 36 (step S02).

Thereafter, similarly, the distance “LR” to the projected image position of the point located on the right side from the projector device 10 and the distance “LL” to the projected image position of the point located on the left side are sequentially measured (step S03, S04).
Next, instead of the horizontal chart image HC, a vertical chart image VC shown in FIG. 4B is projected and displayed (step S05).

The vertical chart image VC is composed of three point images that are arranged so that the center point overlaps the center point of the horizontal chart image HC and is arranged at equal intervals in the full vertical direction of the projection range PA.
In a state where the vertical chart image VC is projected and displayed, the distance “LT” from the point located on the upper side to the projected image position is measured by the phase difference sensor 13 and the distance measurement processing unit 36 (step S06).

  Thereafter, the distance “LB” to the projected image position of the point located on the lower side is measured in the same manner (step S07). In this case, the distance “LC” of the point located at the center to the projected image position is the same as that in the case of the horizontal chart image HC, and has already been measured in step S02. The measurement process here is omitted.

  The processing of this subroutine is completed as described above, and the process returns to the main routine of FIG. 3, and the content of the distance data “LC” of the representative center position is stored in the projector device 10 from the above measured distance data. It is determined whether or not a preset maximum projectable range, for example, 15.0 [m] is exceeded (step M02).

  Here, if it is determined that the maximum projectable range is exceeded, the installation position of the projector apparatus 10 is too far from the projection target screen as a whole, and an accurately focused image cannot be projected. As an example, the image PI of the first guide message as shown in FIG. 5A is projected and displayed on the screen to be projected by the projection lens 12, and the sound similar to this content is displayed on the speaker by the sound processing unit 37. 16 is made to sound loudly (step M03), prompting the user to change the installation position of the projector apparatus 10, and the process of FIG.

  FIG. 5A illustrates a case where the content of the word “Please bring the projector close to the screen” is output to the user as an image and sound as the first message. Although it is unlikely that the user will be recognized by the user, it is quite possible that it will be understood that some kind of guide message is projected, and the same content is also announced by voice, so the user can be more sure It is possible to prompt the user to change the installation position.

  If it is determined in step M02 that the distance data “LC” of the center position of the projection range PA is within the maximum projectable range preset in the projector device 10, then each obtained distance data Accordingly, the relative position relationship between the projector device 10 and the screen to be projected, specifically, the distance data “LC” of the center position of the projection range PA, and the distance data “LT” and “LB”, respectively, are perpendicular to the projection optical axis. The tilt angle in the horizontal direction with respect to the projection optical axis is calculated based on the tilt angle in the direction, and the distance data “LL” and “LR” (step M04).

  Here, after calculating how far the screen is from the projector device 10 and in what direction and how much the screen is tilted with respect to the projection optical axis, the trapezoidal correction is manually performed based on the tilt direction and tilt angle. It is determined whether or not it is within a range of possible inclination directions and inclination angles (step M05).

  Here, for example, the range in which the projector device 10 can automatically correct the trapezoid is ± 30 [°] both in the vertical and horizontal directions, and the range in which the keystone correction can be manually performed exceeds the automatically possible range. Assuming that each is ± 40 [°], if the screen tilt angle with respect to the actual projection optical axis exceeds the range in which the trapezoid correction can be manually performed in step M05, the trapezoid can be performed either automatically or manually. Assuming that the correction cannot be performed, an image PI of the second guide message as shown in FIG. 5B is projected and displayed on the projection target screen by the projection lens 12, and a sound similar to this content is displayed. The voice processor 37 makes a loud sound report through the speaker 16 (step M06), prompting the user to change the installation position of the projector device 10, and this FIG. Processing the temporarily terminated.

  FIG. 5B illustrates the case where the content of the word “Please re-install the projector closer to the front of the screen” is output to the user as an image and sound as the second message, However, it is unlikely that the user will be able to recognize all of its contents, but the fact that some kind of guide message is projected is well understood by the user, Since the same content is reported, it is possible to prompt the user to change the installation position more reliably.

  If it is determined in step M05 that the installation position is within the range of the tilt direction and tilt angle that can be manually corrected for trapezoidal correction, then the range of the tilt direction and tilt angle that can be automatically corrected for trapezoid is set. (Step M07).

  Here, if it is determined that it is within the range where manual keystone correction is possible, but is outside the range where automatic keystone correction is performed, the automatic trapezoid accompanying the operation of the “AF / AK” key is performed. Since the correction cannot be executed, an image PI of the third guide message as shown in FIG. 5C is projected and displayed on the projection target screen by the projection lens 12, and the same sound as this content is displayed. Based on the distance data “LC” of the center position of the detected projection range PA, the sound processing unit 37 causes the speaker 16 to make a loud sound (step M08), prompts the user to manually perform a trapezoidal shape. The automatic focusing process by driving the projection lens 12 is executed (step M09), and the process of FIG.

  FIG. 5C illustrates a case where the content of the word “please manually correct keystone” is output to the user as an image and sound as the third message, and some of these images are displayed to some extent. Although trapezoidal distortion has occurred, it is highly likely that the user will be able to recognize it sufficiently, and since the same content is also reported by voice, the content will surely be understood by the user. .

  If it is determined in step M07 that the installation position is within the range of tilt direction and tilt angle that can be automatically trapezoidally corrected, automatic trapezoidal correction processing is performed so that the maximum rectangular projection range can be obtained immediately. (Step M10), and thereafter, an automatic focusing process is performed by driving the projection lens 12 based on the distance data “LC” of the center position of the detected projection range PA (Step M11). The process of FIG. 3 is once terminated.

  As shown in FIG. 5D, the automatic keystone correction process and the automatic focusing process associated with the operation of the “AF / AK” key are completed after the automatic focusing process in step M11 is completed. The image PI of the fourth guide message is projected and displayed on the screen to be projected by the projection lens 12 for a fixed time, for example, 5 [seconds], and the same sound as this content is displayed on the speaker 16 by the sound processing unit 37. It is good also as what makes a loud sound report sound.

  That is, FIG. 5D illustrates the case where the content of the word “AF / AK processing is completed” is output to the user as an image and sound as the fourth message. Since it is the projection display and the sound output after the focusing process is finished, it seems that the contents are surely understood by the user.

  Thus, by accurately grasping the relative positional relationship between the projector device 10 that projects an image and the screen to be projected, it is possible to appropriately determine whether trapezoid correction is possible, and to quickly determine the determination result. It is possible to return to the user and prompt the user to deal with it if necessary.

  Further, in the above embodiment, the trapezoidal correction function can be activated in a plurality of stages and the state is notified to the user, for example, when automatic keystone correction is possible but manual keystone correction is possible. Since it was assumed, it can be left to the user's judgment.

  Furthermore, not in the above-described embodiment, for example, even when automatic trapezoidal correction is possible, depending on the inclination angle, the obtained rectangular projection range may be significantly reduced. The range in which the keystone correction can be automatically performed is divided into a plurality of stages, and the state may be notified to the user and left to the user's judgment.

  In the above embodiment, as shown in FIG. 4, a chart image suitable for distance measurement is projected to obtain the distance to each of a plurality of points, so that more accurate distance measurement is performed and keystone correction is performed. It is possible to determine whether it is possible or not.

  In the above embodiment, the distance data to a plurality of positions in the projection range is obtained by the distance measuring sensor 13 arranged close to the projection lens 12. However, the present invention is not limited to this. An imaging unit with an automatic focusing function may be provided in place of the distance measuring sensor 13, and distances to a plurality of positions in the projected image may be acquired by sequentially switching focus areas by the automatic focusing function of the imaging unit. .

  In this case, if the automatic focusing function of the photographing unit is a contrast method, any pattern image suitable for detecting the contrast, particularly an image pattern with a clear outline so that a high contrast can be obtained in the focus area. It is more effective to project and display an object from the projection lens 12 toward the screen.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, at least one of the problems described in the column of the problem to be solved by the invention can be solved, and described in the column of the effect of the invention. In a case where at least one of the obtained effects can be obtained, a configuration in which this configuration requirement is deleted can be extracted as an invention.

1 is a perspective view showing an external configuration of a projector apparatus according to an embodiment of the present invention. The block diagram which shows the functional circuit structure of the apparatus which concerns on the same embodiment. The flowchart which shows the processing content at the time of the initial setting which concerns on the embodiment. The figure which shows the flowchart etc. which show the detailed processing content of step M01 of FIG. 3 which concerns on the embodiment. The figure which illustrates the output state of the various guide messages which concern on the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Projector apparatus, 11 ... Main body casing, 12 ... Projection lens, 13 ... Distance measuring sensor, 14 ... Ir receiving part, 15 ... Switch part, 16 ... Speaker, 21 ... Input / output connector part, 22 ... Input / output interface (I) / F), 23 ... Image conversion unit, 24 ... Projection encoder, 25 ... Video RAM, 26 ... Projection drive unit, 27 ... Micromirror element, 28 ... Reflector, 29 ... Light source lamp, 30 ... Color wheel, 31 ... Integrator, 32 ... Mirror, 33 ... Motor (M), 34 ... Projection light processing unit, 35 ... Control unit, 36 ... Distance measurement processing unit, 37 ... Audio processing unit, 38 ... Ir receiving unit, PA ... Projection range, PI ... Projection Image, SB ... System bus.

Claims (11)

Projection means for projecting an image;
Ranging means for measuring the distance to a plurality of positions on the projection target surface by the projecting means,
An arithmetic means for calculating the relative positional relationship between the apparatus and the projection target surface based on the distances to a plurality of positions obtained by the distance measuring means;
A determination means for determining whether or not trapezoid correction is possible based on the positional relationship obtained by the calculation means and preset angle range information;
When this determination means determines that automatic keystone correction cannot be performed, an output means for outputting a notification for encouraging manual keystone correction and when this determination means determines that automatic keystone correction cannot be performed, based on the distance measured by the distance measurement means, A projection apparatus comprising an automatic focusing means for performing an automatic focusing process.   The projection apparatus according to claim 1, wherein the output unit performs a notification output that prompts the user to change the installation without correcting the keystone when the determination unit determines that the keystone cannot be corrected. The determination means determines whether or not the keystone correction is possible based on the angle range information in a plurality of stages related to the keystone correction,
The projection apparatus according to claim 1, wherein the output unit performs notification output stepwise based on a determination result of the determination unit.   4. The projection apparatus according to claim 3, wherein the angle range information of the plurality of stages relates to range information of automatic trapezoidal correction and manual trapezoidal correction. 5. The projection apparatus according to claim 1, wherein the distance measuring unit measures distances to a plurality of positions in a state where a predetermined chart image is projected by the projection unit.   6. The determination unit according to claim 1, wherein the determination unit determines whether the positional relationship between the apparatus and the projection target surface calculated by the calculation unit exceeds a maximum projectable range. The projection device according to item.   When the determination unit determines that the positional relationship between the apparatus and the projection target surface exceeds the maximum projectable range, the output unit changes the installation position to the user without performing focusing processing or keystone correction. The projection apparatus according to claim 6, wherein a notification output for prompting is performed. Further comprising automatic keystone correction means for performing automatic keystone correction processing based on the calculation result of the calculation means,
When it is determined that the determination means can perform automatic keystone correction, the automatic keystone correction means performs automatic keystone correction processing and the automatic focusing means performs automatic focusing processing.
The projection apparatus according to claim 1, wherein the output unit outputs a notification to the user that the automatic trapezoidal correction and the automatic focusing process have been completed. The projection apparatus according to claim 1, wherein the output unit performs the notification output by a loud sound report sound along with a projection display of a guide message. A projection setting method for a projection apparatus, comprising: a projection unit that projects an image; and a distance measurement unit that measures distances to a plurality of positions of a projection target surface by the projection unit,
A calculation step of calculating a relative positional relationship between the apparatus and the projection target surface based on the distance to the plurality of positions obtained by the distance measuring unit;
A determination step of determining whether trapezoid correction is possible based on the positional relationship obtained in this calculation step and the preset angle range information;
When it is determined that automatic keystone correction cannot be performed in this determination step, an output step of performing a notification output that prompts manual keystone correction;
A projection setting method comprising: an automatic focusing step for performing an automatic focusing process based on the distance measured by the distance measuring unit when it is determined that the automatic keystone correction cannot be performed in this determination step. A program executed by a computer incorporated in a projection apparatus including a projection unit that projects an image and a distance measurement unit that measures distances to a plurality of positions on a projection target surface by the projection unit,
A calculation step of calculating a relative positional relationship between the apparatus and the projection target surface based on the distance to the plurality of positions obtained by the distance measuring unit,
A determination step of determining whether trapezoidal correction is possible based on the positional relationship obtained in this calculation step and preset angle range information;
If it is determined in this determination step that automatic keystone correction cannot be performed, an output step for performing a notification output that prompts manual keystone correction;
A program for causing a computer to execute an automatic focusing step for performing an automatic focusing process on the basis of the distance measured by the distance measuring unit when it is determined that the automatic keystone correction cannot be performed in this determination step.

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