JP2009008752A - Projection device, method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify labors needed for a user to the minimum and display an object image in a full size. <P>SOLUTION: This projection device comprises an image storage part 43 which picks up an image of a reference object of a known size by image pickup systems 13, 46, 41 and stores the image together with the size information and which stores an image picked up by placing side by side a projection object desired to be projected at full size and the reference object, projection systems 24-31, 12 which project images, and a control part 35 which emits a pair of parallel light with a known interval from laser emission parts 14, 15, picks up planes of projection where the parallel light is reflected by pickup systems 13, 46, 41, calculates the distance from the position of the parallel light in the obtained image to the plane of projection, projects the images of the projection object and the reference object at the obtained distance by the projection systems 24-31, 12, retrieves the reference object in the images obtained by picking up the projection images, computes the zoom magnification for projecting the projection object at full size from the size and the projection distance of the retrieved reference object, and projects the images of the projection object and the reference object at the zoom magnification by the projection systems 24-31, 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projection apparatus, a projection method, and a program suitable for a data projector apparatus that performs a presentation.

2. Description of the Related Art Conventionally, a distance measuring unit that measures a distance to a projection surface in an image display apparatus that projects and displays an image on a projection surface in order to accurately display (project) the display image in a desired size or actual size by a simple operation. In response to selection of a part of the image and input of information indicating the target display size of the selected part, the actual display of the selected part is performed using the measurement result by the distance measuring means. There has been considered a technique in which a control means for performing a control operation for setting the size of a display image so that the size substantially matches the target display size is provided. (For example, Patent Document 1)
JP 2002-297119 A

  In the technique described in Patent Document 1, in addition to the operation of the full-size object designation button, the operation of the determination button for storing the first coordinate position P1 and the determination for storing the second coordinate position P2 The operation of the button and the input of the actual size value (target size value) in the horizontal direction of the image through the actual size input device (keyboard or the like) are imposed on the user. As described above, the operation required by the user is not easy but rather complicated.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to display an image of an object in full size while simplifying the effort required for the user as much as possible. To provide a projection device, a projection method, and a program.

  According to a first aspect of the present invention, there is provided storage means for storing an image of a reference object of a known size together with size information thereof, and a first object for photographing a projection object to be projected in actual size side by side with the reference object. A projection condition for projecting the projection target in actual size is obtained from the photographing means, the projection means for projecting the image, the first calculation means for obtaining the projection magnification, the size of the reference object and the projection magnification. Second projection means for computing, and projecting the projection object in full size under the projection condition calculated by the second computation means.

  According to a second aspect of the invention, in the first aspect of the invention, the first calculation means for obtaining the projection magnification is an optical lens system constituting the projection means, and a laser beam emitted in the projection direction of the projection means. Any one of light is used.

  According to a third aspect of the present invention, in the first aspect of the present invention, the first calculation means for obtaining the projection magnification emits a pair of parallel lights at a known interval toward the projection target by the projection means. Means, a second photographing means for photographing the state in which the parallel light emitted from the emitting means is reflected in the image projected by the projecting means, and the reflected image in the captured image obtained by the second photographing means. And second calculation means for calculating the projection condition of the projection means from the positions of the parallel light beams of known intervals.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the second calculation means retrieves the reference object from the images obtained by the second photographing means by a pattern matching technique. Features.

  According to a fifth aspect of the present invention, in the first aspect of the present invention, the storage means stores an image of a reference object having a known size to which a coded image in which size information is coded is attached. Features.

  According to a sixth aspect of the present invention, there is provided a storing step of storing an image of a reference object having a known size together with its size information, and a first object for photographing a projection object to be projected in actual size side by side with the reference object. A projection step of projecting an image, and a first calculation step of obtaining a projection magnification, and projecting the projection target at full size from the size of the reference object and the projection magnification. Features.

  The invention according to claim 7 is the invention according to claim 6, wherein the first calculation step for obtaining the projection magnification is emitted in the projection direction in the projection step and the optical lens system used in the projection step. One of the laser beams is used.

  The invention according to claim 8 is the invention according to claim 6, wherein the first calculation step for obtaining the projection magnification directs a pair of parallel lights at a known interval to a projection target by a projection unit that projects an image. The second shooting step for shooting the state in which the parallel light emitted in the emission step is reflected in the image projected by the projection unit, and the captured image obtained in the second shooting step. And second calculating means for calculating a projection condition in the projection unit from positions of parallel light reflected at a known interval.

  The invention according to claim 9 is a program executed by a computer built in a projection apparatus having a projection unit that projects an image, and stores an image of a reference object of a known size together with its size information. A step, a first photographing step of photographing a projection object to be projected in actual size side by side with the reference object, a first calculation step for obtaining a projection magnification, a size of the reference object, and the projection magnification And causing the computer to execute a second calculation step for calculating a projection condition for projecting the projection target in full size.

  According to a tenth aspect of the present invention, in the ninth aspect of the invention, the first calculation step for obtaining the projection magnification emits a pair of parallel lights at a known interval toward a projection target by the projection unit. Reflected in the exiting step, a second capturing step for capturing a state in which the parallel light emitted in the exiting step is reflected in the image projected by the projection unit, and the captured image obtained in the second capturing step The computer is caused to execute a second calculation step of calculating a projection condition in the projection unit from positions of parallel light having a known interval.

  ADVANTAGE OF THE INVENTION According to this invention, the image of a target object can be displayed in full size, simplifying the effort required for a user as much as possible.

  An embodiment in which the present invention is applied to a data projector apparatus of DLP (Digital Light Processing) (registered trademark) system will be described below with reference to the drawings.

  FIG. 1 shows an external configuration of a data projector apparatus 10 according to the embodiment. In the figure, the data projector device 10 is provided with a projection lens unit 12, a photographing lens unit 13, a pair of laser beam emitting units 14, 15 and a remote control light receiving unit 16 on the front surface of a rectangular parallelepiped main body casing 11.

  A key input unit 17 is disposed on the upper surface of the main casing 11.

  The projection lens unit 12 enlarges an optical image created inside and projects it onto a target such as a screen, and the focus position and the zoom position (projection angle of view) can be arbitrarily changed.

  The photographing lens unit 13 has a photographing angle that covers the maximum zoom angle of the projection lens unit 12, and the focusing position and the zoom position (shooting angle of view) can be arbitrarily changed in the same manner as the projection lens unit 12. If necessary, the projected image is taken.

  The laser beam emitting units 14 and 15 are spaced apart from both ends of the front surface of the main casing 11 and emit a pair of parallel laser beams toward the projected image prior to the projection of a full-size image to be described later. .

  The remote control light receiving unit 16 receives infrared modulated light from a remote controller for the data projector apparatus 10 not shown here.

  The key input unit 17 is for directly accepting user key operations and controlling various projection operations. For example, a power key, input switching key, zoom up / down key, focus up / down key, menu key, cursor key (“↑”, “↓”, “←”, “→”), enter key, cancel key, “full-scale projection” key, and the like.

  Although not shown here, the back surface of the main body casing 11 is provided with a connector portion for inputting / outputting various image signals, a remote control light receiving portion similar to the remote control light receiving portion 16, an antitheft fitting mounting portion, a speaker, and the like. Yes.

FIG. 2 is a block diagram showing a functional configuration of an electronic circuit provided in the data projector device 10.
In the figure, reference numeral 21 denotes an input / output connector section, which comprises, for example, a pin jack (RCA) type video input terminal, RGB input terminal, and USB (Universal Serial Bus) terminal.

  Image signals of various standards input from the input / output connector unit 21 are recognized as image signals of a predetermined format suitable for projection by the image conversion unit 23 via the input / output interface (I / F) 22 and the system bus SB. After being converted as necessary, it is sent to the projection drive unit 24.

  At this time, various characters for OSD (On Screen Display) and symbols such as pointers are also sent to the projection drive unit 24 in a state of being superimposed on the image signal as necessary.

  The projection drive unit 24 develops and stores the transmitted image signal in the video RAM 25, and then generates a video signal from the stored contents of the video RAM 25. The projection drive unit 24 multiplies the frame rate of this video signal, for example, 60 [frames / second] by the image size, the number of color component divisions, and the number of display gradations, thereby performing spatial light by faster time division drive. The micromirror element 26 which is a modulation element (SOM) is driven to display.

  On the other hand, a light source lamp 28 using, for example, an ultra-high pressure mercury lamp disposed in the reflector 27 emits white light with high luminance. The white light emitted from the light source lamp 28 is colored into a primary color in a time-sharing manner through the color wheel 29, converted into a luminous flux having a uniform luminance distribution by the integrator 30, and then totally reflected by the mirror 31 to the micromirror element 26. Irradiated.

  Then, an optical image is formed by the reflected light from the micromirror element 26, and the formed optical image is projected and displayed on the screen (not shown) to be projected through the projection lens unit 12.

  The projection lens unit 12 includes a focus lens and a zoom lens in a lens optical system (not shown), and both are controlled by moving back and forth along the optical axis direction.

  Further, the projection light processing unit 34 performs both the lighting driving of the light source lamp 28 and the rotation driving of the motor (M) 33 for the color wheel 29.

  The control unit 35 controls all the operations of the above circuits. The control unit 35 is a CPU, and controls the data projector apparatus 10 using a program memory 36 that is a non-volatile memory that stores operation programs, various fixed data, and the like, and a main memory 37 that is a RAM that is used as a work memory. Perform the action.

  An operation unit 38 is connected to the control unit 35. The operation unit 38 includes the key input unit 17, the remote control light receiving unit 16, and a remote control light receiving unit on the back side of the main body casing 11 (not shown), and a key code signal based on a key operated by a user directly or via a remote controller. Is directly output to the control unit 35.

  Further, an audio processing unit 39, a wireless LAN interface (I / F) 40, a process circuit 41, a laser drive unit 42, and an image storage unit 43 are connected to the control unit 35 via the system bus SB.

  The sound processing unit 39 includes a sound source circuit such as a PCM sound source, converts the sound data provided during the projection operation into analog data, and drives a speaker 44 provided, for example, on the back surface of the main body casing of the data projector device 10 to emit sound. Or, a beep sound or the like is generated if necessary.

  The wireless LAN interface 40 is sent from another external device that configures the wireless LAN, such as a personal computer, via the wireless LAN antenna 45 under the control of the control unit 35 in accordance with, for example, the IEEE 802.11b / g standard. The incoming image signal or the like is selectively received and sent to the image conversion unit 23.

  The process circuit 41 receives an output from a CCD 46 (Charge Coupled Device) 46 as an individual imaging device disposed at an imaging position on the lens optical axis of the photographing lens unit 13 and receives an AGC (Automatic Gain Control). ), After performing A / D conversion, color process processing such as gamma correction and matrix calculation to luminance color difference system is executed to obtain photographed image data, and the obtained image data is stored in the image storage unit 43.

  The laser driving unit 42 performs light emission driving of the laser light emitting units 14 and 15 that are both constituted by laser diodes.

Next, the operation of the above embodiment will be described.
First, prior to performing the actual projection operation, the “full-scale projection” key of the key input unit 17 is operated to set the registration state of the reference object as a reference for the size, and then the reference object Shoot by itself to register. In the present embodiment, for example, a cigarette package is photographed as a reference object, luminance information of image data obtained by photographing is extracted, corrected as appropriate, and stored in the image storage unit 43. At this time, the vertical and horizontal sizes of the reference object, for example, size data such as vertical 85 [mm] × horizontal 55 [mm] are also stored in association with each other.

  Then, the projection object to be projected to the actual size is photographed simultaneously with the reference object whose size is registered. In this case, photographing is performed so that the projection object and the reference object are within the same screen at an equal distance from the photographing lens unit 13. Image data obtained by shooting is stored in the image storage unit 43 in the same manner as the image data of the reference object.

  In the present embodiment, it is assumed that two plastic bottles are photographed as projection objects to be projected in actual size. FIG. 5A is an image showing the first plastic bottle as a projection object alone. FIG. 5B is an image showing the second plastic bottle as another projection object alone.

  Each of these projection objects is not stored alone as image data, but an image parallel to the reference object is stored as described above.

  FIG. 5C exemplifies image data obtained by photographing a cigarette package as a reference object, and this image data is stored in the image storage unit 43 together with its size data.

  FIG. 6A illustrates image data when the first plastic bottle that is the projection object is photographed in parallel with the cigarette package that is the reference object, and the image data is the image storage unit 43. Saved in.

  Similarly, FIG. 6B illustrates image data when a second plastic bottle that is another projection object is photographed in parallel with a cigarette package that is a reference object. Data is also stored in the image storage unit 43.

  Thus, in the state where the image data of the reference object and the image data obtained by photographing the projection object and the reference object at the same time are stored in the image storage unit 43, the data projector device 10 can actually perform any projection. When the projector is installed in an environment and the projection of the image of the projection object stored by operating the “full-scale projection” key after turning on the power is instructed, the following processing is executed.

  FIG. 3 is a flowchart for explaining the processing contents when the control unit 35 calculates a part of the operation program for full-size projection stored in the program memory 36, particularly the distance to the projection plane.

  Initially, the distortion of the projection area is corrected (step S301). This is because the original aspect ratio is obtained when a standard rectangular aspect ratio, for example, a vertical white image with an aspect ratio of 3: 3 is projected from the projection lens unit 12 and the projection image is captured through the projection lens unit 12. It is detected how much distortion is generated compared to the rectangular shape of this, and the distortion of the projected image is canceled by intentionally generating distortion in the reverse direction in the optical image formed by the micromirror element 26 based on the detection result. Make corrections. This correction is called automatic keystone correction.

  Thus, in a state where the distortion is corrected by the automatic trapezoidal correction and a rectangular white surface image having an accurate aspect ratio is projected, the laser light emitting units 14 and 15 are driven to emit light by the laser driving unit 42, and the projection surface is projected. Two laser beams are irradiated (step S302).

  In this manner, two laser light images reflected in a white rectangular image are captured on the projection surface (step S303).

  Then, it is determined whether or not the positions of the two laser beams have been detected from the image data obtained by photographing (step S304).

  Here, when the positions of the two laser beams cannot be detected, the following processing is impossible, and thus the processing of FIG. 3 is temporarily terminated while the laser beam position can be detected. In that case, the distance between the two laser beams in the captured image is then measured, and the distance to the projection surface is calculated (step S305).

In this case, for example, if the distance X from the data projector device 10 to the screen that is the projection surface is 1.0 [m], the magnification Y (1...) Of the photographing lens unit 13 in the initial state (the widest angle side of the zoom range). When the image is taken at (0 times), the area Z of the actual imaged area is 12 [m ² ] (vertical 3.0 [m] × horizontal 4.0 [m]). Assume that the program memory 36 stores in advance as a part of fixed data constituting the operation program. The magnification Y of the photographic lens unit 13 is set to 1.0 times on the widest angle side of the zoom range, and the magnification changes equally according to the ratio of the length in the photographed image every time the zoom is zoomed to the telephoto side. And

  The laser beam emitting units 14 and 15 emit parallel light as described above. If the distance A between the laser beam emitting units 14 and 15 is, for example, 0.2 [m], of course, even on the screen of the projection surface. The interval between the two laser beams does not change.

  Here, the ratio A: a of the distance A [m] between the two laser beams reflected in the captured image and the distance a [m] of the two laser beams in the captured image data is 1: 3. If the actual distance A is taken through the photographing lens unit 13 of Y times, the photographed as a distance of 3 times, that is, the lens magnification Y of the photographing lens unit 13 at the time of photographing is 3.0 times. It will be.

  Based on the distance A [m] between the two laser beams detected from the captured image, the lengths of the vertical and horizontal sides of the projected image are obtained.

Here, if the length of the vertical side is 0.4 [m] and the length of the horizontal side is 0.53 [m], the magnification Y of the taking lens unit 13 is 3.0, so Area
(0.40 × 3.0 × 0.53 × 3.0) [m ² ]
= (Vertical) 1.20 x (horizontal) 1.59 [m ² ].

As described above, the ratio of the distance X to the projection surface and the horizontal length of the shooting range is
Since 1 [m]: 4 [m] = X [m]: 1.59 [m]
X = about 0.40 [m], and the distance X to the projection surface can be obtained.

  The distance X thus calculated is associated with the photographed image data and stored in the image storage unit 43 (step S306), and the process of FIG. stand by.

  FIG. 4 shows a process executed when an image projection instruction is given. Initially, “full-scale projection” is executed in which a full-size projection is executed after the process of FIG. It is determined whether or not it is a projection instruction when the key is operated (step S401).

  Here, when it is determined that the projection is performed by operating the “full-scale projection” key, the following operations are performed in the image data stored in the image storage unit 43 and the projection target and the reference target that perform the full-scale projection. Is selected from the image data shot on the same screen, and the operation is executed after the processing of FIG. 3 is executed. Therefore, the size is registered from the image data to be projected. A reference target image is searched (step S402).

  In this case, specifically, the entire image data to be projected is first extracted using only the luminance signal component, and a monochrome contour image is acquired and then registered in advance, which is also a reference object only for the luminance signal. A search is executed by performing a pattern matching process with an image.

  When executing this search, pattern matching processing is executed with the original reference size set to the original size. If not, for example, 110%, 120%,..., 400% are sequentially enlarged from the original size. The pattern matching process is executed, and if it still does not match, it is included in the projection target image by performing the pattern matching process by reducing the original size sequentially, such as 90%, 80%, ... 10%. It is possible to cope with the difference in the size of the reference target images.

  Then, it is determined whether or not the reference target image has been searched as a result of the search by the pattern matching process (step S403).

  If the search is successful, the reference target image in the projection image is determined based on the ratio of the reference target image to the projection target image, the size data of the stored reference target image, and the distance data to the projection plane stored in step S306. The zoom magnification in the projection lens unit 12 is variably set so as to be accurately the actual size (step S404), the image projection operation is executed (step S405), and the processing of FIG. To do.

  6C and 6D exemplify a state in which the image data shown in FIGS. 6A and 6B is projected so that the reference target image in the image becomes the actual size. To do. As shown in the figure, for a size that cannot be recognized by a single projection target image, a reference target image serving as a common reference is simultaneously photographed, and a search based on the reference target image registered in advance is performed. Projection of the projection target image according to the size can be executed without requiring a complicated operation or the like, and the accurate size of the projection target image can be easily recognized.

  If it is determined in step S401 that the projection operation is not a projection operation by operating the “full-size projection” key, but is a normal projection operation, or the pattern of the reference target image from the images selected to be projected in step S403. If it is determined that the projection lens unit 12 cannot be detected, the process proceeds directly to step S405 to perform the projection operation with the zoom magnification set in the projection lens unit 12 set at that time regardless of the size of the reference target image. Execute.

  As described above, according to the present embodiment, after performing registration by capturing an image of a reference object, the target object to be projected is imaged together with the registered reference object. While simplifying the necessary effort as much as possible, the image of the object can be displayed in actual size.

  In the above embodiment, the size of the projection target image is determined by simultaneously capturing the projection target image and the reference target image and performing pattern matching processing with the reference target image captured in advance. To do.

  Accordingly, it is possible to determine the size of the projection target image by a relatively simple image processing technique without requiring any complicated operation by the user, such as a numerical value indicating the size of the projection target image.

  Further, as a means for searching for the reference target image portion from the projection target image including the reference target image, the pattern matching processing has been described. However, the present invention is not limited to this, and other neural networks, In addition, it is also possible to use an Adaboost technology that represents a boosting technology that has made remarkable progress in recent years.

  Furthermore, in the above-described embodiment, an image of a cigarette package is used as an example of the reference target image. However, the present invention is not limited to this, and any bills, coins, and other types may be used depending on the size of the projection target. Such an object may be selected.

  Further, the description has been made on the assumption that the corresponding size data is also stored in association with the shooting and registration of the reference target image. A one-dimensional or two-dimensional barcode image known as a QP code (registered trademark) is created and the sticker is pasted on the front side of the reference object, and the reference object including the barcode When a full-scale projection is performed by photographing and storing an object image, the barcode portion in the reference target image may be analyzed simultaneously.

  In this way, it is not necessary to associate and store size data, which is different data, for the reference target image, and data management can be further simplified.

  In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the functions executed in the above-described embodiments may be implemented in appropriate combination as much as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination according to a plurality of disclosed structural requirements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect is obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

1 is a perspective view showing an external configuration of a data projector apparatus according to an embodiment of the present invention. FIG. 2 is an exemplary block diagram showing a functional configuration of an electronic circuit included in the data projector apparatus according to the embodiment. 6 is a flowchart showing the processing content when calculating the distance of a full-size image projection according to the embodiment. The flowchart which shows the processing content at the time of the actual size image projection which concerns on the embodiment. The figure which illustrates each image of the projection target object and reference | standard target object which concerns on the same embodiment. The figure which illustrates the picked-up image of the projection target object and reference | standard object which concern on the same embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Data projector apparatus, 11 ... Main body casing, 12 ... Projection lens part, 13 ... Shooting lens part, 14, 15 ... Laser beam emission part, 16 ... Remote control light-receiving part, 17 ... Key input part, 21 ... Input / output connector part , 22 ... input / output interface (I / F), 23 ... image conversion unit, 24 ... projection drive unit, 25 ... video RAM, 26 ... micromirror element (SOM), 27 ... reflector, 28 ... light source lamp, 29 ... color Wheel, 30 ... Integrator, 31 ... Mirror, 33 ... Motor (M), 34 ... Projection light processing unit, 35 ... Control unit, 36 ... Program memory, 37 ... Main memory, 38 ... Operation unit, 39 ... Audio processing unit, DESCRIPTION OF SYMBOLS 40 ... Wireless LAN interface (I / F), 41 ... Process circuit, 42 ... Laser drive part, 43 ... Image storage part, 44 ... Speaker, 45 ... Wireless L N antenna, 46 ... CCD, SB ... system bus.

Claims (10)

Storage means for storing an image of a reference object of known size along with its size information;
First imaging means for imaging a projection object to be projected in actual size side by side with the reference object;
Projection means for projecting an image;
First computing means for obtaining a projection magnification;
A second computing unit that computes a projection condition for projecting the projection target in actual size from the size of the reference object and the projection magnification, and the projection condition calculated by the second computing unit A projection apparatus characterized in that the projection object is projected in actual size by the above.   2. The first calculation means for obtaining the projection magnification uses one of an optical lens system constituting the projection means and a laser beam emitted in the projection direction of the projection means. Projection device. The first calculation means for obtaining the projection magnification is:
Emitting means for emitting a pair of parallel lights with a known interval toward the projection target by the projection means;
Second imaging means for imaging a state in which the parallel light emitted by the emitting means is reflected in the image projected by the projecting means;
And a second computing unit that computes a projection condition of the projection unit from positions of parallel light beams of a known interval reflected in a captured image obtained by the second imaging unit. Item 4. The projection device according to Item 1.   4. The projection apparatus according to claim 3, wherein the second calculation means searches for the reference object from an image obtained by the second photographing means by a pattern matching technique.   2. The projection apparatus according to claim 1, wherein the storage unit stores an image of a reference object having a known size to which a coded image obtained by encoding size information is pasted. A storage step of storing an image of a reference object of known size along with its size information;
A first photographing step of photographing a projection object to be projected in actual size side by side with the reference object;
A projection process for projecting an image;
A projection method characterized by comprising: a first calculation step for obtaining a projection magnification, and projecting the projection object at full size from the size of the reference object and the projection magnification.   7. The first calculation step for obtaining the projection magnification uses one of an optical lens system used in the projection step and a laser beam emitted in the projection direction in the projection step. Projection method. The first calculation step for obtaining the projection magnification is as follows:
An emission step of emitting a pair of parallel lights at a known interval toward a projection target by a projection unit that projects an image;
A second imaging step of imaging a state in which the parallel light emitted in the emission step is reflected in the image projected by the projection unit;
And second calculating means for calculating a projection condition in the projection unit from positions of parallel light of a known interval reflected in a captured image obtained in the second imaging step. Item 7. The projection method according to Item 6. A program executed by a computer incorporated in a projection apparatus including a projection unit that projects an image,
A storage step for storing an image of a reference object of known size along with its size information;
A first photographing step of photographing a projection object to be projected in actual size side by side with the reference object;
A first calculation step for obtaining a projection magnification;
A program for causing a computer to execute a second calculation step for calculating a projection condition for projecting a projection object in actual size from the size of the reference object and the projection magnification. The first calculation step for obtaining the projection magnification is as follows:
An emission step of emitting a pair of parallel lights with a known interval toward the projection target by the projection unit;
A second imaging step of imaging a state in which the parallel light emitted in the emission step is reflected in the image projected by the projection unit;
A computer is caused to execute a second calculation step of calculating a projection condition in the projection unit from positions of parallel light beams of a known interval reflected in the captured image obtained in the second imaging step. The program according to claim 9.

Images