KR102061087B1 - Method, apparatus and program stored in storage medium for focusing for video projector - Google Patents

Abstract

A focusing method for a video projector, comprising: a picked-up image generating step of picking up a projected image projected on a screen from a video projector to generate a picked-up image ; A depth difference calculating step of calculating a depth difference corresponding to a blur degree of the captured image with respect to a sharp reference image; And an AF control signal generating step of generating an AF (autofocus) control signal of the video projector from the depth difference.

Description

FOCUSING METHOD, DEVICE AND STORAGE MEDIUM FOR VIDEO PROJECTOR {METHOD, APPARATUS AND PROGRAM STORED IN STORAGE MEDIUM FOR FOCUSING FOR VIDEO PROJECTOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focusing method for a video projector, an apparatus and a program stored in a storage medium. More particularly, the focusing of a video projector according to the degree of blur of an image (image) projected from a video projector onto a screen. A focusing method for a video projector, an apparatus and a program stored in a storage medium, for outputting an AF control signal for focusing correction to a module.

In general, in a video projector that projects an image onto a screen, the distance between the screen and the video projector may vary, and it is necessary to focus the projected image according to this distance.

Conventionally, as disclosed in the patent document, in an LCD projector, an autofocusing circuit of a liquid crystal projector that automatically focuses according to the distance between the projector and the screen and the size of the screen, which detects the distance between the liquid crystal projector and the screen. Distance sensing means; A microcomputer for outputting a focus control signal according to the distance sensed by the distance sensing means; A motor driver for driving a focusing motor according to a focus control signal output from the microcomputer; Disclosed is a technology including a lens moving unit for adjusting a focus of an image projected on the screen by moving a focus adjusting lens forward or backward according to an operation of the focusing motor.

Publication of Utility Model Registration No. 129657

By the way, although the said patent document technique is comprised so that it may focus according to distance, when changing the image size on a screen, focusing may change also. In this case, there is a problem in that focusing cannot be achieved only by distance, and the hassle of focusing again occurs as the size is changed.

Further, in the above patent document technology, the microcomputer outputs the focus control signal in accordance with the distance between the projector and the screen. However, there is no disclosure about the specific means for measuring the distance. In addition, known distance measuring methods are not necessarily able to always calculate an accurate distance value in the environment of use of a video projector.

For example, the ultrasonic method is a method of determining the distance to the screen by measuring the time difference of the wave that is returned to the screen by ultrasonic waves. This is a way to automatically focus on the calculated distance. By the way, this system requires an ultrasonic actuator and a sensor for catching the reflected wave. In addition, the ultrasonic rangefinder is notably accurate in noise environments such as factories or automobile roads.

In addition, the TOF method is a method of determining the distance by measuring the time difference between the infrared rays shot back to the screen and the infrared rays. This is similar to the ultrasonic method. However, this method also requires an IR emitter and an IR camera sensor. And the accuracy is remarkably degraded in the time zone where the influence of infrared rays is high like morning and evening, and in the place where there is much surrounding infrared ray like the volcano area.

Likewise, laser rangefinders are significantly less accurate in intense light environments, such as under sunlight.

The method of calculating the distance after receiving the reflected wave after radiation of light waves, sound waves, and the like is all degraded by the influence of disturbance caused by noise from the surrounding environment. Accordingly, there is a problem that a distance measuring mechanism in a manner different from that of the reflected wave is required.

The present invention is proposed to solve the above problems of the prior art, even if the user freely changes the size of the image projected on the screen, the focus of the image on the screen by the video projector automatically regardless of the size of the image It is intended to provide a program stored in a focusing method, apparatus and storage medium for a video projector that can be matched.

Then, the image projected on the screen is input from the video projector, and the AF control signal for focusing correction is generated from the blur degree expressed by the depth information of the image, not the distance to the screen, and the video projector is generated. The present invention provides a focusing method for a video projector, an apparatus, and a program stored in a storage medium by outputting to a focusing module of a video projector.

In addition, by using the depth image (depth map) calculation function that is less influenced by the surrounding environment, especially robust to noise and low light, the blurring degree converted from the depth information of the depth image is minimized to achieve the sharpest focus. It is an object of the present invention to provide a method, apparatus, and program stored in a storage medium for a video projector.

According to an aspect of the present invention, there is provided a focusing method for a video projector, the sensing image generating step of generating a captured image by capturing a projected image projected on a screen from a video projector; A depth difference calculating step of calculating a depth difference corresponding to a blur degree of the captured image with respect to a sharp reference image; And an AF control signal generating step of generating an AF (autofocus) control signal of the video projector from the depth difference.

Here, the captured image is composed of the RGB image of the visible light and the infrared IR image and the depth image calculated from the RGB image and the IR image obtained by imaging the projection image at the same angle by a single imaging device desirable.

The depth difference is a PSF of the depth image output according to the blurring degree of the RGB image with respect to the reference image. It is preferably calculated based on the difference between the index values .

Here, it is the PSF index value is preferably being expressed in number of pixels and, by the number of pixels of a blurred portion of the RGB image is the blur degree calculation.

The depth difference calculating step may include: an average depth calculation step of calculating an average depth from the captured image; And a blur degree conversion step in which a corresponding blur degree is converted from the average depth.

In the AF control signal generating step, it is preferable to determine whether the blur degree is minimum, and to calculate the AF control signal value to terminate the processing if the blur level is minimum and to reduce the blur degree if it is not the minimum.

On the other hand, a focusing method for a video projector according to another embodiment includes: a picked-up image generating step of picking up a projection image projected on a screen from a video projector to generate a picked up image ; A depth calculation step of calculating a depth to a subject corresponding to a blur degree of the captured image; And an AF control signal calculating step of generating an AF control signal of the video projector from the depth.

Here, the AF control signal corresponding to the depth is preferably calculated using an experimental experience value that is a ratio between the depth, the displacement distance for driving the actual motor, and the AF control signal.

In addition, the captured image or the presentation video including the captured image is preferably recorded .

On the other hand, the focusing apparatus for a video projector according to an embodiment of the present invention for achieving the above object, an image pickup unit for generating a captured image by imaging the projection image projected on the screen from the video projector; Depth difference that calculates a depth difference corresponding to a blur degree of the captured image with respect to a sharp reference image Calculator ; And an AF control signal for generating an AF (autofocus) control signal of the video projector from the depth difference. It characterized by including to yirueojim biological father.

In addition, the program stored in the storage medium readable by the information processing device according to an embodiment of the present invention for achieving the above object, the program for performing each step of the method described above to the information processing device Characterized in that the program is stored in a storage medium that can be read.

According to the present invention, a focusing method, apparatus and apparatus for a video projector that can focus an image on a screen by a video projector automatically regardless of the size of the image, even if the user freely changes the size of the image projected on the screen. It is to provide a program stored in the storage medium.

Then, the image projected on the screen is input from the video projector, and the AF control signal for focusing correction is generated from the blur degree expressed by the depth information of the image, not the distance to the screen, and the video projector is generated. The present invention provides a focusing method for a video projector, an apparatus, and a program stored in a storage medium by outputting to a focusing module of a video projector.

In addition, by using the depth image (depth map) calculation function that is less influenced by the surrounding environment, especially robust to noise and low light, the blurring degree converted from the depth information of the depth image is minimized to achieve the sharpest focus. It is an object of the present invention to provide a method, apparatus, and program stored in a storage medium for a video projector.

1 is a schematic block flowchart for implementing an autofocus and video recording function of a video projector using an information extraction apparatus according to an embodiment of the present invention, for example, the DR1152.
2 is an exemplary photograph of a general video projector, its screen, and an RGB image, an IR image, and a depth image captured by the information extraction apparatus of the present invention, such as the DR1152.
3 is an exemplary photograph of a blur RGB image and a corresponding depth image, and a sharp RGB image and a corresponding depth image.
4 is an exemplary graph showing a concept of calculating an AF control signal using a blur degree difference.
FIG. 5 is a diagram showing a formula and a concept of calculating an actual distance at a blur size.
6 is a block flowchart of an autofocus and video recording function according to an embodiment of the present invention.
7 is a schematic plan layout view of an information extraction apparatus, a video projector, a screen, a user, and a projected image according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to specific embodiments with reference to the accompanying drawings. However, the part which has the same function by the same structure may abbreviate | omit the detailed description by keeping same code | symbol even if drawing differs. In addition, one step or module may be implemented by being separated into two or more steps or modules, and conversely, two or more steps or modules may be implemented by being merged into one step or module. The apparatus for performing the method may be implemented by a circuit fixedly formed with hardware, or may be implemented by a circuit that is variably changeable by a program installed in the hardware. As the image to be recorded, the following description will be given by taking the RGB image, but the same can be applied to the IR image.

<Basic Configuration>

Focusing method for a video projector according to an embodiment of the present invention, the captured image generation step (10 ~ 40) ; Depth difference calculating step 51 ; And AF control signal generation steps (52, 53) .

2 shows the overall system configuration. There is a general video projector 60 and a screen s, and the information extraction apparatus 10, for example, the DR1152 camera system is installed independently of it. After the information extraction apparatus 10 captures the projected image of the video projector 60, the output image (i), that is, the RGB image 20, the IR image 30, and the depth image 40 are separately separated. Show on monitor

The captured image generating step 10 to 40 is a step of generating a captured image i by capturing the projected image i ₀ projected onto the screen s from the video projector VP 60.

3 shows a captured image i of a projected image on a screen and its corresponding depth image (depth map). The upper left image is a blurred image on the screen s of the projector 60, and the lower image is a depth image 40 from the information extraction apparatus 10, for example, DR1152. On the other hand, the right image of Figure 3, the upper side is the image (sharp image) of the focus on the image on the screen (s) of the projector 60, the lower side is the information extraction device 10, the depth image of the DR1152 ( 40 ').

The present invention detects the blur of the blurry image on the left side, calculates the distance difference, generates a correction control signal Δz, and sends the same to a module that performs the AF function of the projector.

Since the projected image i ₀ is represented by light on a flat screen s, perspective is recognized according to depth to a person such as a sky, a mountain, a car, or a person on the projected image i ₀ . Even if the objects to be represented are represented, the actual physical depth is the surface s of the screen. Therefore, when the depth is measured by the reflected wave by ultrasonic waves, infrared rays, laser beams or the like as in the conventional art, only the depth of the surface of the physical screen s is output. That is, according to the method of these ultrasonic waves, infrared rays, a laser beam, etc., the distance between the screen s and the video projector 60 can only be known.

However, the operation of the AF module according to the correlation between the distance and the focus is different for each video projector 60. This is because the configuration of the adopted AF module, specifically, the specifications of the motor, lens, case, etc. are different. Therefore, even if the distance between the screen s and the video projector 60 is known, if an abnormality occurs in the operation of the AF module, the correlation is not applied and there is a concern that focusing may not be performed.

In the present invention, since the picked-up image (i) is generated and the focusing is performed therefrom, there is a large difference from the known techniques in that the focusing is performed by the same image as that recognized by the human eye.

The depth difference calculating step is a step of calculating a depth difference corresponding to a blur degree d of the captured image i with respect to the sharp reference image i '.

The graph of FIG. 4 shows the concept of calculating the AF control signal Δz using the blur difference. The solid line represents the mean and the dashed line represents the standard deviation.

Here, the information extraction apparatus 10 of the present invention, for example, DR1152, has a depth curve characteristic as shown in FIG. The output PSF index value (value between 1 and 121) is different depending on the blurring degree of the image. The more blur, the larger the PSF index value.

In Fig. 4, the depth image (depth map, left) when the screen is blurry (blur) and the depth image (right) when the focus is (sharp) are shown in the depth curve. The difference between the PSF index values in both cases represents the depth difference (distance difference).

The captured image i is a planar image but may have a sense of depth. This depth can be extracted from the blur degree d of the captured image i. That is, depth information of each pixel unit may be extracted according to the boundary line and the degree of blur of the captured objects in the captured image i.

In the present invention, the depth difference is calculated from the depth information according to the blur degree d of the captured image i and the depth information of the sharp reference image i 'serving as a reference. The sharp reference image i 'is an image in a focused state, which may be an image stored in advance or a virtual image estimated by removing blur from the captured image i.

The AF control signal generating step is a step of generating an AF (autofocus) control signal Δz of the video projector 60 from the depth difference.

In the graph of Fig. 4, the AF control signal [Delta] z is generated from the depth difference.

The depth difference means a distance to be moved in the depth direction in order to focus by removing the blur of the current captured image i and making it as sharp as the reference image i '. Therefore, the AF module of the video projector needs to be focused by moving in an amount corresponding to this depth difference.

The AF control signal Δz may include a value calculated by reflecting the experience value set for each video projector 60 by reflecting the depth difference.

<Effect>

According to the configuration of the present invention, the blur of the captured image (i) of the projection image (i ₀ ) formed on the screen (s), not the distance (a) between the surface of the screen (s) and the video projector 60. Focusing is performed using the depth difference calculated from the degree (d).

Therefore, in the prior art, if an error occurs due to the focusing according to the distance a, the focusing can not be corrected more automatically even if it is repeatedly performed in the same manner, but according to the present invention, it is possible to obtain from the actual screen s. Since focusing is performed by the depth difference based on the captured image (i), focusing that is practically usable by, for example, only one focusing is possible without focusing according to the distance, and focusing is performed once by the depth difference, for example. After the overlapping is applied again by the second difference focusing by the depth difference, almost perfect focusing can be achieved.

In addition, since the present invention uses a method of calculating the distance by sensing the blur of the captured image (i) of the projected image on the screen from the video projector itself, an additional emitter such as an ultrasonic actuator or an IR emitter of the prior art is used. And no receiver is required. And it is not affected by external noise.

In addition, by simultaneously acquiring IR images, a very good focusing effect is obtained even in a low light environment.

<Illustration and information extraction device>

As a device for generating the captured image (i), a general visible light camera, i.e., an RGB camera, may be used, but not limited to this, for example, an infrared camera, i.e., an IR camera, may be used. However, calculating depth image using only one kind of image has a definite limitation.

Therefore, the captured image i is preferably composed of an RGB image 20 , an IR image 30, and a depth image 40 ( depth map ) .

In this case, preferably, the RGB image 20 and the IR image 30 are images obtained by simultaneously capturing the projection image i0 at the same angle by one imaging device 11, The RGB image 20 is an image made of visible light, and the IR image 30 is infrared It is an image.

The imaging device 11 may include a four-color sensor of a dual aperture single lens type. The depth image 40 ( depth map ) is calculated from the RGB image 20 and the IR image 30 and includes depth information. The depth image 40 calculating device 12 generates depth images by extracting depth information by utilizing a specific focus of the RGB image 20 and an all-in focus characteristic of the IR image 30. can do. The imaging device 11 and the depth image calculator 12 may constitute one information extraction device 10.

The technique of extracting depth with a double-aperture single lens camera is implemented by the system semiconductor of DR1152. The DR1152 is a system that provides 3D depth image information as well as RGB and IR images based on a single lens. The present invention can implement a video autofocus function by utilizing the system of the DR1152. In addition, a video recording function may be added using the RGB signal of the DR1152 system.

That is, the present invention is a technique for implementing autofocus of a video projector based on a device for extracting 3D depth information and infrared information of a dual-aperture single lens method.

<PSF Index>

In this case, the depth difference is the PSF of the depth image 40 output according to the blur degree d of the RGB image 20 with respect to the reference image i '. It is preferably calculated based on the difference between the index values .

In generating the depth image 40 from the RGB image 20 and the IR image 30 by the dual-aperture single-lens four-color sensor, the blur degree is changed in multiple steps with respect to the IR image 30 of the all-in-focus. There is a method of forming a PSF index, and comparing the RGB image 20 on a pixel basis to determine the depth according to the PSF index. The depth difference may be calculated according to the difference of the PSF index values.

And PSF is the index value is preferably a search is represented by a number of pixels, the blur blur degree (d) by the number of pixels of pieces of RGB image 20 is calculated. That is, since the PSF index value is clearly identified according to the number of pixels, the depth difference can be clearly and simply calculated from this.

Necessity of Average Depth

As shown in Fig. 7, the apparatuses used in the present invention are the information extraction apparatus 10 and the video projector 60, so that at least one of them is aligned with the exact center of the screen s in the arrangement relationship thereof. There is no choice but to be in a state. In the case of Fig. 7, the video projector 60 is aligned with the center of the screen s, but the information extraction apparatus 10 is not aligned.

In this case, the picked-up image i, which is the output of the information extracting apparatus 10, may be misinterpreted with different depth values for the object whose actual depth is to be calculated the same. For example, in FIG. 7, there is a possibility that the depth of the projected image on the right side re is larger than the projected image on the left side le of the screen s.

On the contrary, even though the information extraction apparatus 10 is aligned, even if the video projector 60 is not aligned, portions to be output at the same depth may be output at different depths.

In addition, in the information extraction apparatus 10 or the video projector 60, the arc-shaped depth lines represent the same depth as shown in FIG. 7, but since the screen s is flat, the depth of the object represented on the screen is reduced. There is a possibility that a difference occurs in the central portion and the upper, lower, left and right ends.

In order to prepare for such a situation, the depth difference calculating step according to another embodiment of the present invention, the average depth calculation step ; And blurring degree conversion step is preferably made. The average depth calculating step is a step of calculating the average depth from the captured image (i). The average depth may be calculated by averaging the left end and the right end, the upper end and the lower end, or the center and the end. The blurring degree converting step is a step of converting a blurring degree (d) corresponding to the average depth. Therefore, it is possible to calculate a more accurate depth difference by removing the distortion phenomenon.

<Determination of minimum blur and calculation of new control value>

In the AF control signal generating step, the AF control signal value (determining whether the blur degree d is minimum, ending the processing if the minimum is small, and reducing the blur degree d if the minimum is not minimum ( Δz) is preferably calculated.

For example, when the blur degree of the first captured image i is minimum, the control signal can be terminated without calculating the control signal, so that the processing can be performed quickly.

For example, when the blur degree of the second captured image (i) automatically executed after the first processing becomes the minimum, focusing is performed only once, so that rapid processing is also possible.

For example, the process may be repeated several times. By repeating the process of generating the captured image i, determining the blur degree, and calculating and applying the AF control signal value Δz for reducing the blur degree, control is performed to converge so that the blur degree of the captured image i becomes the minimum blur. The focusing technique based on the blur of the captured image may be included in the scope of the present invention. At this time, fine adjustment can also be made by reducing the AF control signal value.

<Calculation of Control Signal by Depth Calculated by Blur of Captured Image>

Focusing method for a video projector according to another embodiment of the present invention, the captured image generation step (10 ~ 40) ; Depth calculation step 51 ; And AF control signal calculating step (FIG. 5) . This embodiment generates the control signal directly from the depth, not the depth difference.

The captured image generating step (10 to 40) is a step of generating a captured image by capturing the projected image projected on the screen from the video projector. Since this is the same as the previous embodiment, a detailed description thereof will be omitted.

The depth calculating step is a step of calculating a depth to a subject corresponding to a blur degree of the captured image.

Fig. 5 shows a method of calculating the distance (depth) between the information extraction apparatus 10 and the object at the degree of blurring (size), from which the AF control signal Δz for correction is calculated.

As shown in FIG. 5, when the optical theory is applied to the dual aperture type of the present invention, the degree of blur (blur size) of the subject may be converted into an actual depth (distance). In the following Equations 1 and 2, a represents a distance to an actual subject, and the blur degree of the subject formed on the image sensor is represented by d. That is, if d is known, a can be obtained.

In this case, f denotes the focus of the lens itself, and a ₀ denotes the camera focal length set to focus the object on the image sensor.

The composite F number F # represents the combined values of the IR aperture and the RGB aperture, and is expressed by Equation 3 below.

을 이용하여, PSF인덱스를 픽셀 수로 표현이 가능하고, 이는 이미지 센서에 맺힌 블러 이미지의 픽셀 수를 알아내면, PSF인덱스 값을 결국 블러 정도(사이즈)로 표현이 가능함을 의미한다. 이를 이용하면, 수학식 1 혹은 2를 이용하여, 실제 거리 a값을 구할 수 있다.Here, the condition of Equation 1

The PSF index can be expressed by the number of pixels, which means that the PSF index value can be expressed in the degree of blur (size) when the number of pixels of the blur image formed on the image sensor is found. Using this, the actual distance a value can be obtained using Equation 1 or 2.

The AF control signal calculating step is a step of generating an AF control signal of the video projector from the depth. In the present invention, after calculating a value using this process, an empirical value corresponding to the control signal Δz is calculated and this is output.

That is, the AF control signal corresponding to the depth is calculated using an experimental experience value that is a ratio between the depth a, the displacement distance for driving the actual motor, and the AF control signal Δz. desirable.

According to this structure, since the AF control signal is calculated and applied once after the distance has been calculated, the method of the prior art may be applied to the calculation of the distance.

<Recording function for screen and presentation user>

As shown in Figure 1 and Figure 6, the video presentation including the image pick-up image (i) or said image pick-up image (i) is preferably a search record. A recording section 21 may be provided for this purpose.

That is, the present invention can implement a separate device recording function for the projection video of the video projector based on the dual aperture single lens type 3D depth information and infrared information extraction device. Although the RGB image 20 is preferably used as the captured image i used for the recording, the IR image 30 or the depth image 40 may be used. Thus, the presenter and the announcement screen can be recorded at the same time.

<Focus for Video Projector>

On the other hand, the focusing device for a video projector according to an embodiment of the present invention, the image pickup unit ; Depth difference Calculator ; And AF control signal Characterized in that it comprises a generator .

The captured image generating unit is a member for capturing the projected image i ₀ projected on the screen s from the video projector 60 to generate the captured image i.

The depth difference The calculation unit is a member for calculating a depth difference corresponding to the blur degree d of the captured image i with respect to the sharp reference image i '.

The AF control signal The generation unit is a member that generates the AF (autofocus) control signal Δz of the video projector 60 from the depth difference.

<Program saved in storage media>

On the other hand, a program stored in a storage medium that can be read by the information processing device according to an embodiment of the present invention, a program for performing the steps of the video projector focusing method described above to the information processing device is read by the information processing device. A program stored on a storage medium. The information processing device is not limited to a computer, but includes all current and near future devices that process information by digital or analog and perform a predetermined process.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not limited by these Examples, The present invention is not limited by these Examples, and has the common knowledge in the technical field to which this invention belongs. Improvements, changes, and modifications made by rulers should all be construed as falling within the scope of the present invention. For example, in the above embodiment, the control signal is generated from the depth difference, or the control signal is generated from the depth. However, the present invention is not limited thereto, and the actual depth is calculated using the depth difference, and the experience ratio is set to the value. May be applied to generate a control signal.

The invention can be used in a focusing method, apparatus and program stored in a storage medium for a video projector.

10: information extraction device
11: Dual Iris Single Lens 4-Color Camera
12: depth image calculation means
20: RGB image
21: recording unit
30: IR image
40: depth image (depth map)
50: focusing device
51: average depth calculation unit
52: minimum blur determination unit
53: new AF control signal calculation unit
60: video projector
i ₀ : Projection image
i: Captured image
s: screen
re: right edge
le: left edge
h: presentation audience

Claims (11)

As a focusing method for a video projector,
A captured image generation step of generating a captured image by capturing a projected image which is the object of blur degree extraction, which is the same image recognized by the human eye, projected on a screen from a video projector;
A blur degree calculating step of calculating a blur degree of the captured image with respect to a sharp reference image; And
AF control signal generation step of generating a signal for AF (autofocus) control of the video projector from the blur degree
Focusing method for a video projector comprising a. The method according to claim 1,
The captured image,
The projection image is imaged at the same angle by one imaging device, so that an RGB image of visible light and an IR image of infrared light are simultaneously obtained.
Depth image calculated from the RGB image and IR image
Focusing method for a video projector, characterized in that consisting of. The method according to claim 2,
The blur degree is calculated based on a difference between PSF index values of the depth image output according to the blur degree of the RGB image with respect to the reference image.
Focusing method for a video projector, characterized in that. The method according to claim 3,
The PSF index value is represented by the number of pixels ,
The blur degree is calculated by the number of pixels of the blur portion of the RGB image.
Focusing method for a video projector, characterized in that. The method according to claim 1,
The blur degree calculation step,
An average depth calculating step of calculating an average depth from the captured image; And
Blur degree conversion step of converting the corresponding degree of blur from the average depth
Focusing method for a video projector comprising a. The method according to claim 1,
In the AF control signal generating step, it is determined whether the blur degree is minimum, and if it is minimum, the processing is terminated, and if it is not the minimum, the AF control signal value is calculated so as to reduce the blur degree.
Focusing method for a video projector, characterized in that. As a focusing method for a video projector,
A captured image generating step of generating a captured image by capturing a projected image which is the object of blur degree extraction, which is the same image recognized by the human eye, projected on a screen from a video projector;
A depth calculation step of calculating a depth to a subject corresponding to a blur degree of the captured image; And
AF control signal calculating step of generating an AF control signal of the video projector from the depth
Focusing method for a video projector comprising a. The method according to claim 7,
The AF control signal corresponding to the depth is calculated using the ratio between the depth, the displacement distance for driving the actual motor, and the AF control signal.
Focusing method for a video projector, characterized in that. The method according to claim 1 or 7,
The captured image or the presentation video including the captured image is recorded .
Focusing method for a video projector, characterized in that. A focusing device for a video projector,
A captured image generation unit projecting a projection image on which a blur degree is to be extracted, which is the same image recognized by the human eye as projected on a screen from a video projector to generate a captured image ;
A blur degree calculator configured to calculate a blur degree of the captured image with respect to a sharp reference image; And
AF control signal generator for generating a signal for AF (autofocus) control of the video projector from the blur degree
Focusing device for a video projector comprising a. A program stored in a storage medium that can be read by an information processing device.
A program stored in a storage medium that can be read by the information processing device by a program for performing each step of the method according to any one of claims 1 to 8.

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