JP4653422B2 - Drawing data storage method and drawing data storage device - Google Patents

Description

  The present invention superimposes drawing data obtained by photographing a subject such as writing information on the front of the screen onto the image data of the image projected on the screen, and projects the drawing data from the back of the screen. In particular, the present invention relates to a drawing data storage method, a drawing data storage device, and a projection image display device.

  2. Description of the Related Art Conventionally, a rear projection type display device that projects an image onto a screen by a projector from a back surface (back surface) opposite to a surface (front surface) observed by an observer of a transmissive screen has been used. In recent years, this rear-projection type display has been used in demonstrations such as events and conferences, and it has a function to display the drawing written on the front side of the screen with the image projected on the screen and display it on the screen. There is a strong demand for a function of manipulating an image projected on a screen by touching it directly.

  As one method that satisfies these needs, there is a method in which a subject existing in front of the screen is photographed from the back side of the screen by a camera using a CCD solid-state imaging device and necessary information is extracted from the photographed image.

  However, when shooting from the back of the screen, the conventional rear-projection display screens focus on the visibility when observing from the front, and the amount of light when observing the projection light from the projector from the front is reduced. In general, a Fresnel lens for making it uniform and a lenticular lens for improving the visibility are provided, but if a picture is taken from the back of a screen using these, the image is distorted. In addition, in order to obtain a good quality image, it is necessary that the external light from the front surface of the screen is sufficiently transmitted to the back side, whereas if the scattering performance of the light projected from the back surface is increased, the transmission performance is reduced. There's a problem.

  Thus, for example, a mask is provided between the projector and the screen, the projection display period is set to the transmission state, and the imaging period is set to the light blocking state or the light scattering state (see Patent Document 1).

  In addition, a screen is configured with a liquid crystal sandwiched between a lenticular lens and a Fresnel lens, an electric field is applied to the liquid crystal, and the refractive index is made to match that of the lenticular lens at the time of imaging so that it is in a light transmissive state. Some have a light scattering state by making the refractive index inconsistent with the lenticular lens (see Patent Document 2).

  However, with these methods, the manufacture of the screen is expensive, and the screen state, the camera, and the projector are made with high precision so as not to give a strange feeling to the user observing the projection surface from the front. It is necessary to control at high speed, which complicates the system configuration and control.

  On the other hand, there are areas in which light diffusing areas and areas transmitting light from the front face are provided in a grid pattern to improve the visibility of the projected image and the image quality of the photographed image of the rear camera (Patent Literature). 3).

  According to this method, there is an advantage that external light is efficiently taken in, the visibility of the projected image is prevented from being lowered, and it is not necessary to switch the state during use of the apparatus. However, in consideration of the image quality of the image captured from the back side, in which a high-quality projected image is displayed to the observer on the front side of the screen, the diffusion area and the transmission area of the screen must be arranged with high accuracy. There is a problem that it is difficult and costly.

Furthermore, using a screen that is electrically set to two states, a scattering state and a transmission state, an image is projected from the back of the screen, and a manuscript or a participant placed on the front of the screen is displayed on the screen. There is a video image and conference image information that can be stored or transmitted to a remote place by taking a picture from the back (see Patent Document 4).
Japanese Patent Laid-Open No. 06-269002 Japanese Patent No. 2940716 JP 2000-101981 JP 2003-94886 A

  However, all of the disclosed techniques project an image based on image data onto a screen. For example, when information is written by hand on the screen in a meeting or the like, the written handwritten information is projected. It is not possible to save with edited image data or edit the saved information.

  In view of the above circumstances, the present invention can acquire and save image data projected on a screen and drawing data relating to an object shadow on a display surface of the screen and a drawing written on the display surface of the screen in an editable state. Easy drawing data storage method, drawing data storage device, improved visibility of projected images on the front of the screen, and securing the amount of light necessary to shoot the subject from the back of the screen to the front of the screen. An object of the present invention is to provide a projected image display device.

The drawing data storage method of the present invention that achieves the above object is the drawing data for storing the drawing data acquired from the drawing written superimposed on the image projected on the screen in a bundle with the image data representing the image. In the storage method, an image based on image data, which is bitmap data input to the image display means, is projected onto the screen from the back side opposite to the display surface of the screen using a projector, and the image is projected. Drawing data is obtained by photographing a drawing written on the display surface of the screen from behind the back of the screen using a camera, and the acquired image data is input to the image display means. The drawing data is pasted, and a composite image based on the pasted composite data is applied to the screen from the rear rear side. With projected using Kuta, the image drawing data acquired been made to save tied to the image data, the image display means, the bit map data with a hierarchical structure by using the virtual printer driver an image of converted image data be those to be displayed on the table 示面 to extract a portion of the drawing written on the display surface of obtaining said drawing data is by photographing by the camera Then, the synthesized data is generated by superimposing the extracted portion on a predetermined position of the image data, and the converted image data and the drawing data are linked and stored.

  In this way, the drawing drawn on the screen on which the image is projected is captured by the camera to obtain the drawing data, and the obtained drawing data is merged with the image data representing the image, and the combined data is saved. Data management is easy.

The drawing data storage device of the present invention that achieves the above object converts drawing data acquired from drawing written on a screen projected onto an image into image data converted into bitmap data representing the image. In a drawing data storage device that stores and ties together, a projector that projects an image based on predetermined image data onto a screen from the rear rear side opposite to the display surface of the screen, and a display surface of the screen on which the image is projected A camera that captures a subject on the side from the back of the screen and obtains drawing data, and sends the generated image data to the projector, and the drawing data obtained by the camera is sent from the camera. When input, composite data obtained by pasting all or part of the input drawing data to the image data Said image display means being sent to the projector, the image data and a virtual printer driver which converts the bitmap data having a hierarchical data input to said image display means, said image display means, and the drawing data The image data converted into bitmap data by the virtual printer driver is stored in a bundle.

  In this way, the image data projected from the projector is provided with image display means for pasting all or part of the drawing data obtained by photographing with the camera, so confirm the composite image by the pasted composite data, Can be saved.

Projection image display apparatus including the upper Symbol onset Ming, a screen, a projector and the display surface of the screen for projecting a projection image from the rear behind the opposite of the image data input from the image display unit on the screen, the A camera that captures an image of a subject in the screen direction from behind the back and obtains imaging data, and the projector projects a projection image of the combined data obtained by pasting the acquired imaging data on the image data onto the screen. An image display device,
The screen is made of a transparent member in which a transparent thin film is attached to the display surface on which light diffusion processing has been performed,
The camera is characterized in that the imaging data is obtained by photographing a drawing written in an erasable manner on the thin film of the screen or a contact surface of an object in contact with the screen.

  Thus, since the screen is subjected to diffusion processing and a transparent thin film is adhered, writing and erasing with a marker is easy.

  According to the drawing data storing method and drawing data storing apparatus of the present invention, image data projected on a screen and drawing data related to an object shadow, a written character, and a figure on the display surface of the screen can be linked and edited. It is possible to save in the state. In addition, according to the projection image display apparatus of the present invention, it is possible to improve the visibility of the projection image on the screen display surface, and it is necessary for photographing the subject on the screen display surface side from the back of the screen. Data with high resolution can be acquired by photographing while ensuring the amount of light.

Embodiments of a drawing data storage method, a drawing data storage device, and a projection image display device of the present invention will be described below.
(First embodiment)
In the first embodiment, the first embodiment of the projection image display device of the present invention is used, and is used in the first embodiment of the drawing data storage method of the present invention. This corresponds to the first embodiment of the rear projection display device to which the first embodiment is applied.

  1 and 2 are diagrams showing a rear projection display device of the first embodiment.

  1A and 2A are external views, and FIGS. 1B and 2B are side sectional views.

  A rear projection display device 10 according to the present embodiment shown in FIG. 1 shows an example of a screen 1 that projects an image, a projector 2 that projects an image onto the screen 1, and a subject in the direction of the screen 1 from behind the back of the screen 1. And a digital camera 3 that captures an image of the subject, a mirror 5 disposed obliquely with respect to the display surface 1a of the screen 1 behind the back surface 1b of the screen 1, a casing 4, and a computer (not shown) It is called “PC”).

  The projector 2 and the digital camera 3 are connected to a PC.

  The lens surface 2a on which the image is projected of the projector 2 and the lens surface 3a of the digital camera 3 that captures the subject are all directed toward the mirror 5, and the light projected from the projector 2 is reflected by the mirror 5. The optical path is directed in a direction perpendicular to the screen 1. Further, the drawing written on the display surface 1a of the screen or the light reflected or transmitted by the contact surface of the object in contact with the display surface 1a of the screen is reflected by the mirror 5 and condensed by the lens 3a of the digital camera 3. The image data is captured by a solid-state image sensor (for example, a CCD image sensor) incorporated in the digital camera 3a.

  The PC has a display screen, and the display screen is based on image data generated by using predetermined software (corresponding to the image display means of the present invention) and image data input externally from a camera or a scanner. On the other hand, image data representing the displayed image is sent to the projector 2, and a similar image of the image displayed on the display screen can be projected from the projector 2 onto the screen 1 by the image data. The image display means will be described later.

  Here, the housing | casing 4 does not necessarily need to be a vertical installation type, and may be a horizontal installation type which made the side face up and down.

  Further, the rear projection display device 10 of the present embodiment includes a digital camera that captures a drawing written on the display surface of the screen and obtains drawing data, but instead of the digital camera, for example, a drawing written on the screen A known digitizer capable of acquiring drawing data by an electromagnetic method or position detection by infrared rays may be provided.

  The rear projection display device 10 of another example shown in FIG. 2 is of a table type, the screen 1 is horizontally disposed on the upper surface of the table, and both the projector 2 and the digital camera 3 have a bottom 4b of the housing. Further, the lens surfaces 2a and 3a are arranged facing the screen. Therefore, the rear projection display device 10 of this example is not provided with the mirror 5.

  3 and 4 are schematic views showing a screen used in the rear projection display device of the present embodiment.

  As shown in FIGS. 3 and 4, the screen 1 of the present embodiment is formed of a transparent acrylic material, and diffused with a diffusion particle layer 101 subjected to diffusion processing for diffusing light to a display surface 1 a for displaying an image. And an acrylic layer 102 which is not processed. The diffusion processing is performed by applying a transparent paint containing fine particles that diffuse light on the surface of the acrylic material.

  As shown in FIG. 3A, when the light of the projector 2 is projected from the back surface 1b side of the screen of the present embodiment that has been subjected to the diffusion processing, the acrylic layer 102 that has not been subjected to the diffusion processing of the back surface 1b. When the passed light reaches the diffusing particle layer, the light is diffused by the diffusing particles in the diffusing particle layer 101 as shown in FIG. 3 (b) in which the portion surrounded by the broken line in FIG. 3 (a) is enlarged. Therefore, an observer who observes the image projected from the back surface 1b side of the screen 1 from the display surface 1a side can observe the projected image without depending on the observation position.

  As shown in FIG. 4, the light incident on the screen 1 from the display surface 1 a side of the screen 1 passes through the diffusion particle layer 101, passes through the acrylic layer 102, and proceeds to the back surface 1 b side. When the light incident from various angles is scattered, unevenness is eliminated, and when the back surface 1b of the screen is photographed by the camera 3 on the back surface 1b side, an image with high contrast can be obtained.

  Here, a transparent thin film is affixed to the diffusion particle layer 101 of the display surface 1a. In addition, the transparent thin film is coated with an antireflection film, which increases the amount of light incident on the camera. The antireflection film preferably has a reflectance of 1% or less when the incident angle is 0 degree. The film thickness including the thin film is preferably 0.25 mm or less in consideration of the transmittance of the light projected from the projector, the contrast of the writing information, and the like.

  In this way, since a transparent thin film is attached to the diffusing particle layer, when characters or figures are written with a marker superimposed on the image projected on the screen, the written letters or figures are easily erased. can do. Further, since the antireflection film is coated, the reflection of light on the screen surface is suppressed, the reflection of the surrounding background is eliminated, and the visibility of the projected image can be improved.

  Since the rear projection display device of the present embodiment uses the screen having such a configuration, not only the drawing (characters, graphics, etc.) written on the display surface of the screen but also the object arranged on the display surface side of the screen. It is possible to shoot using illuminated external light. That is, an object with poor transparency can be photographed as a shadow, and a marker with slight transparency can be photographed as a colored pattern. In addition, since the document superimposed on the display surface of the screen cannot use external light, it can be photographed by projecting a single color from the projector and using the light as illumination light.

  In the present embodiment, a diffusion particle layer is formed by applying diffusion particles to the acrylic surface, and a diffusion effect of light passing therethrough is obtained. However, the present invention is not necessarily limited to this method, and it is possible to obtain a diffusion effect by processing the acrylic directly by cutting or polishing.

  As the transparent substrate of the screen, acrylic is preferable from the viewpoint of processability and cost, but it is not necessary to be limited to this, and any material having a refractive index close to air and transparent may be used.

  5 and 6 are diagrams showing image display means of the rear projection display device of the present embodiment.

  The image display means 30 shown in FIG. 5A shows an image extraction unit 31 that extracts the drawing itself written on the screen 1 from the drawing data acquired by the digital camera 3, and the extracted drawing. The image acquisition unit 32 for determining the image size and position to paste the data, and the drawing data for which the paste position has been determined by the image acquisition unit is pasted to the generated or externally input image data based on the projection file When the camera 3 is used to shoot the drawing written on the display surface of the screen 1, the case of shooting the shadow of the object on the screen, and the document superimposed on the display surface. Switching means 34 for switching an image projected on the screen 1 by the projector 2 to illumination light according to the case of shooting.

  When the document superimposed on the screen is photographed by the camera, the switching unit 34 stops projecting the image and emits illumination light from the projector 2 because external light does not reach the document surface.

  The image display means 30 is installed in a PC connected to the projector 2 and the digital camera 3 and pastes drawing data photographed by the digital camera 3 into a projection file 35 generated using, for example, an application program of the PC. FIG. 5B shows a program having a function of creating composite data. As shown in FIG. 5B, a drawn image 110 represented by the drawing data on the image originally projected from the projector onto the screen. A composite image to which is attached is projected.

  As a program used to create the projection file shown in FIG. 5C, API (Application Programming Interface) is open to the public. Therefore, the drawing data photographed by the digital camera is pasted on the image data based on the projection file that has been projected onto the screen and is created by using the program with published API, and the projection file of the projected image Can be saved as internal data.

  As a result, drawing data can be pasted on the projection file that was originally projected on the screen and checked on the screen, and the projection file with the drawing data attached can be saved later. It is possible to re-edit and cut pasted drawing data.

  Note that the digital camera does not necessarily need to be a hand-drawn drawing, but it may be a printed manuscript that captures the contents of paper materials as drawing data and uses them together with electronic materials. You can also.

  The image display means 30 shown in another example in FIG. 6A is extracted with an image extraction unit 31 that extracts the drawing itself written on the screen 1 from the drawing data acquired by the digital camera 3. The image acquisition unit 32 for determining the image size and position to paste the drawn data, and the drawing data for which the image acquisition unit has determined the pasting position and the like are pasted to the projection file converted into the bitmap data, When photographing the drawing written on the display surface of the screen 1, photographing the shadow of the object on the screen, and photographing the document superimposed on the display surface by the data adding unit 33 to be created and the camera 3. And a switching means 34 for switching an image projected on the screen 1 by the projector 2 to illumination light.

  When the document superimposed on the screen is photographed by the camera, the switching unit 34 stops projecting the image and emits illumination light from the projector 2 because external light does not reach the document surface.

  In this example, since an image (document) of a projection file created by a program whose API is not disclosed is projected, bitmap data once converted into a file having a hierarchical structure by the virtual printer driver 40 is a data addition unit. 33. Except for the point where the bitmap data converted by the virtual printer driver 40 is input, the image display means is the same as that shown in FIG.

  Here, the printer driver is usually a program for printing the print information of the application on paper, but the virtual printer driver is a program for outputting the print information as an image other than the actual printer. Therefore, when the application has a print function, file information is output as image information by setting the virtual printer driver as the output destination driver.

  As shown in FIG. 6B, the document image 120 of the projection file created by a program whose API is not disclosed is converted by the virtual printer driver 40 to create an image file 130 having a hierarchical structure. Can do.

  The document image 120 created by a program whose API is not disclosed is developed into a hierarchical image file through the virtual printer driver 40 by the printing function. Since arbitrary image data can be added to the image file, information can be added without being restricted by the application.

  Therefore, in the case of a projection file created by a program whose API is not disclosed, as shown in FIG. 6C, the file is written when it is written over the file projected from the projector on the screen. The drawn drawing data is extracted from the obtained drawing data (upper stage), and the extracted drawing data is added to the hierarchical image file 130 developed through the virtual printer driver 40. Then, the document image 120 and the drawing image 110 can be superimposed and displayed on the PC (lower row).

  Since the API used to create the projection file shown in FIG. 6D does not disclose the API, drawing data captured by the digital camera is pasted as internal data of the projection file projected on the screen. I can't. On the other hand, if the data is combined to display the combined image on the screen, the combined portion of data is lost. Therefore, in this example, the projection file is temporarily converted into an image file for each page by the virtual printer driver, and the drawing data is overlaid on the page to which the drawing data is pasted in the converted image file. Without losing the projection file, the drawing data and the converted image file can be linked and saved in a linked state.

In this way, by creating a hierarchical file through a virtual printer driver, an application document and additional information such as a drawn drawing can be managed so as to be editable later if the application has a printing function. .
(Second Embodiment)
In the second embodiment, the second embodiment of the projection image display apparatus of the present invention is used, and the second embodiment of the drawing data storage method of the present invention is used. This corresponds to the second embodiment of the rear projection display device to which the second embodiment is applied.

  In the second embodiment, compared to the first embodiment, a transparent flat plate member is attached to the back surface side of the display surface on which the screen used in the rear projection display device has been subjected to diffusion processing by an adhesive. The screen structure is different, but the other points are common. Therefore, a different structure of the screen will be described.

  First, as a comparative example, a conventionally used screen structure in which a Fresnel lens is provided on the back side will be described.

  FIG. 7 is a schematic diagram showing the structure of a comparative screen having a Fresnel lens on the back side.

  In the screen shown in FIG. 7, the Fresnel lens 52, the diffusion sheet 51, and the reinforcing glass 50 form a layer structure from the back side toward the display side. In order to eliminate unevenness in the amount of light projected from the light source 53 to the back side, light incident at different angles is made into a parallel optical path 55 by the Fresnel lens 52, projected onto the diffusion sheet 51, and projected from the display surface side. Is visible.

  Thus, the screen of this structure has a configuration that places importance on the visibility of the projected image for the viewer on the display surface side. Therefore, when the screen surface is photographed from the back side of the screen having such a structure, the subject on the display surface side of the screen is blurred due to the influence of the Fresnel lens 52. Further, when shooting with the camera in a state of being projected from the light source 53, for example, when using as a supplementary light for shooting with the camera by making a monochromatic display, the reflected light of the projection light on the surface of the Fresnel lens 52 interferes. Noise is mixed in the captured image.

  8A and 8B are diagrams for explaining the structure of the screen according to the present embodiment. FIG. 8A shows a structure bonded with an adhesive, and FIG. 8B shows a structure not bonded with an adhesive.

  The appearance of the rear image projection apparatus of this embodiment is the same as that illustrated in FIGS. 1 and 2 in the first embodiment. In particular, in the table type shown in FIG. 2, it is conceivable that the user touches the screen surface or places an object when the user surrounds the conference and performs a meeting or the like. Therefore, it is often necessary for the screen surface to be strong enough to withstand this, and for large screens to be used for presentations, meetings, etc., the strength is naturally necessary.

  Therefore, it is necessary to provide a reinforcing plate on the back surface on the display surface side. However, when the reinforcing plate is simply attached, an air layer is generated between the acrylic member constituting the display surface and the reinforcing acrylic member. .

  In FIG. 8, the screen includes a diffusing particle layer 101 subjected to diffusion processing and an acrylic layer 102, a transparent member 104 on the display surface side on which a projection image is displayed, and a transparent member on the back side on which the projection image is projected. A flat plate member 105.

  In the transparent member 104 on the display surface side, the diffusion particle layer 102 is formed by applying diffusion particles to the surface of the acrylic flat plate material.

  Further, the transparent member 104 on the display surface side and the flat plate member 105 on the back surface side are both attached with transparent thin films 103 and 107, and the thin films 103 and 107 are coated with an antireflection film.

  The antireflection film is set so that the reflectance is 1% or less when the incident angle is 0 degree.

  The screen having a structure in which the transparent member 104 on the display surface side and the transparent flat plate member 105 on the back surface side are bonded together by the adhesive 106, the transparent member 104 on the display surface side and the transparent member 105 on the back surface side are acrylic materials, The refractive indexes are both 1.4, for example, and the material is selected so that the refractive index of the adhesive 106 is equal to or higher than the refractive index of the acrylic material.

  For example, an acrylic ultraviolet curable adhesive can be used as the adhesive, but the adhesive is not necessarily limited thereto, and has a refractive index close to that of the flat plate member 105 and has a property that the cured color becomes transparent. If it is.

  In general, light undergoes total reflection when entering a material having a high refractive index from a material having a high refractive index. From this property, as shown in FIG. 8A, when there are two contact surfaces between the acrylic member and the air from the front surface to the back surface of the screen, total reflection can occur on the two surfaces (1), ( 2). This reduces the rate at which external light incident from the front of the screen reaches the back.

  However, the total reflection at the first surface boundary is achieved by bonding the transparent member 104 on the display surface side and the transparent member 105 on the back surface side with a substance that is higher than the refractive index of the acrylic member and close to the refractive index of the acrylic member. (3) and (4), the light entering the back surface increases compared to the case where there is an air layer, the amount of light on the back of the screen increases, and the imaging contrast when shooting with the camera from the back side increases. .

  Thereby, when the subject on the display surface side is photographed by the camera from the back side of the screen, drawing data with higher brightness and higher resolution can be obtained.

  Further, since the antireflection film 107 is coated on the transparent member 105 on the back side, reflection of light projected from the projector is suppressed, and a projection image when a written character or the like is photographed by the camera is used. Noise due to can be suppressed.

  FIG. 9 is a diagram showing light transmission characteristics when an antireflection film is applied to the screen of the present embodiment to prevent external light from being reflected, and FIG. 9A shows a peak gain increased. FIG. 9B shows the peak gain slightly increased, and FIG. 9C shows the gain flat.

  In FIG. 9, the horizontal axis represents the angle at which the viewer's screen is observed, and the vertical axis represents the gain.

  In this way, by performing various taint processing at different angles, it is possible to obtain a high quality shot image from the back without degrading the image quality of the image projected from the projector, and configure the screen according to the application can do.

  Since the screen of the present embodiment includes a reinforcing plate on the back side, the size of the screen can be increased. Therefore, it can be used for rear projection displays in meetings, presentations, etc. to display PC electronic materials on the screen, but when there are changes or additions to the screen display content, the water-based marker is displayed on the screen as if it were a whiteboard. It is possible to directly write by superimposing it on the display content.

  Since the screen of this embodiment has a transparent thin film attached to the display surface, it can be easily written using a marker as if it were a whiteboard, and can be easily erased later. In addition, the image drawn by superimposing while looking at the projected image is shot with the camera from the back, the written information is extracted and pasted on the projected image, and the pasted composite image is projected onto the screen for confirmation At the same time, the written drawing information can be stored in association with the original projection file data and can be edited later.

It is a figure which shows the back projection display apparatus of 1st Embodiment as an example. It is a figure which shows the rear projection display apparatus of 1st Embodiment as another example. It is a schematic diagram which shows the screen used for the rear projection display apparatus of this embodiment. It is a schematic diagram which shows the screen used for the rear projection display apparatus of this embodiment. It is a figure which shows the image display means of the rear projection display apparatus of this embodiment as an example. The composite image projected on a screen from a projector is shown. Shows the situation of saving as internal data of projection file. It is a figure which shows the image display means of the rear projection display apparatus of this embodiment as another example. FIG. 6 is a diagram illustrating that an image file having a hierarchical structure is created by conversion by a virtual printer driver. It is a figure which shows drawing data itself written from drawing data (upper stage), and superimposing it as a document image and a drawing image, and displaying on a screen (lower stage). It is a figure which shows storing the drawing data on the page which pastes drawing data among the converted image files, and having piled up and saved. It is the schematic which shows the structure of the screen of the comparative example in which the Fresnel lens was provided in the back side. It is a figure explaining the structure of the screen of this embodiment. It is a figure which shows the permeation | transmission characteristic of light when an anti-reflective film is given in order to prevent the reflection of external light on the screen of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screen 1a Display surface side 1b Back side 2 Projector 2a, 3a Lens surface 3 Digital camera 4 Case 4b Bottom surface 5 Mirror 30 Image display means 31 Image extraction part 32 Image acquisition part 33 Data addition part 34 Switching means 35 Projection file 40 Virtual Printer driver 50 Glass 51 Diffusion sheet 52 Fresnel lens 53 Light source 55 Parallel light path 10 Rear projection display device 101 Diffusing particle layer 102 Acrylic layer 103, 107 Transparent thin film 104 Transparent member 105 Flat plate member 106 Adhesive 108 Air layer
110 Drawing image 120 Document image 130 Image file

Claims (8)

In a drawing data storage method for storing drawing data acquired from a drawing written by being superimposed on an image projected on a screen in an image data representing the image,
Projecting an image based on image data, which is bitmap data input to the image display means, onto the screen using a projector from the rear rear side opposite to the display surface of the screen,
Drawing data is obtained by photographing a drawing written on the display surface of the screen onto which the image has been projected, using the camera from the back of the back of the screen,
The acquired drawing data is pasted on the image data input to the image display means, and a composite image based on the pasted composite data is projected onto the screen from the rear rear using the projector, and acquired. The rendered data is stored in a bundled manner with the image data,
Said image display means is for displaying an image according to the image data converted into the bitmap data having a hierarchical structure using the virtual printer driver in Table 示面, it is obtained by photographing by the camera The portion related to the drawing written on the display surface is extracted from the drawing data, and the combined data is generated by superimposing the extracted portion on a predetermined position of the image data, and the converted data A drawing data saving method, wherein image data and the drawing data are linked and saved. In a drawing data storage device that stores drawing data acquired from drawing written on an image projected on a screen in a bundled manner with image data converted into bitmap data representing the image,
A projector that projects an image based on predetermined image data onto a screen from the rear rear side opposite to the display surface of the screen;
A camera that captures a subject on the display surface side of the screen on which the image is projected from the back of the screen and obtains drawing data;
The generated image data is sent to the projector, and when the drawing data acquired by the camera is input from the camera, all or part of the input drawing data is added to the image data. Image display means for sending the pasted composite data to the projector;
Includes a virtual printer driver that converts the image data into the bitmap data having a hierarchical data input to said image display means, the,
The drawing data storage device, wherein the image display means stores the drawing data and the image data converted into bitmap data by the virtual printer driver .   The screen has a display unit made of a transparent member with a transparent thin film attached to the display surface subjected to light diffusion processing, and a back surface unit made of a transparent member arranged on the opposite side of the display unit. 3. The drawing data storage device according to claim 2, wherein the display unit and the back surface unit are bonded with an adhesive having a refractive index larger than that of the transparent member. According to the case where the camera captures a drawing written on the display surface of the screen, the case where a shadow of an object shown on the screen is captured, and the case where a document superimposed on the display surface is captured. Switching means for switching the image projected on the screen by the projector to illumination light;
The drawing data storage device according to claim 2, wherein the image display unit stores the drawing data obtained by switching the illumination light by the switching unit and photographing the original with the camera.   The transparent screen member is attached to the screen on the opposite side to the display surface of the transparent member with an adhesive having a higher refractive index than the transparent member. 3. The drawing data storage device according to 3.   The drawing data storage device according to claim 3, wherein the diffusion processing is performed by applying a transparent paint containing fine particles to the display surface of the screen.   4. The drawing data according to claim 3, wherein the transparent thin film attached to the display surface is coated with an antireflection film having a reflectance of 1% or less when the incident angle is 0 degree. Storage device.   2. The flat plate member is attached with a transparent thin film, and the transparent thin film is coated with an antireflection film having a reflectance of 1% or less when the incident angle is 0 degree. 5. The drawing data storage device according to 5.

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