JP3914099B2 - Document photographing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a document photographing apparatus that photographs a document such as a document or a drawing set on a document presentation stand and displays the photographed document image on a CRT, a liquid crystal display, a screen, or the like.
[0002]
[Prior art]
When displaying a document etc. and giving a presentation where the presenter gives an explanation or a lecture while pointing the point with a pointing stick or a laser pointer to the image, a document table and a photographing camera are used as a means of photographing the document. Although a dedicated document camera device assembled as one is known, there are cases where an individual document presentation stand and a photographing camera are used instead of the document camera. When the document camera is not used, the document is placed on the document presentation stand, photographed with the camera, and the document image is displayed on the display means.
[0003]
[Problems to be solved by the invention]
When a presentation is performed without using a dedicated document camera as described above, it is required to fix the relative position, distance, etc. between the document presentation table and the camera in a predetermined state. There was a problem of inviting restrictions on the setting of the presentation venue. In addition, the presentation is usually performed while the documents are sequentially replaced on the presentation table, and the presentation is performed while shooting with the camera. However, if the size of the replaced material is different, the camera shooting direction and zoom magnification are adjusted each time. There was a need for this, and this had hindered the smooth progress of the presentation.
[0004]
Therefore, the present invention can shoot the material set on the material presentation stand with an appropriate screen configuration accurately and promptly according to the size and position of the material, thereby contributing to a smooth presentation, An object of the present invention is to provide a document photographing apparatus that can increase the degree of freedom in setting the presentation table and the camera, and thus the presentation venue.
[0005]
The present invention has a reference point for recognizing a material presentation table provided at least at two diagonal positions of a material presentation table on which materials such as documents and drawings are set, and a zoom function for photographing a material presentation table including the reference point. A photographing unit having the photographing unit, a control unit that controls a photographing operation such as adjustment of a photographing direction and a zoom magnification of the photographing unit, and a display unit that displays a material image photographed by the photographing unit. Based on the position information of the reference point to be photographed by the means, based on the position information of the material set on the material presentation stand to be photographed by the photographing means, There rows and materials imaging processes photographing means for photographing the article recognizes the size of the article, the reference point is a point which emits the light amount equal to or greater than a predetermined threshold value, the light spot is emitted at a specific wavelength Invisible light, An optical filter that allows capturing only visible light, is characterized in that is provided to be freely inserted into and removed from the optical path of the lens of the imaging means.
[0006]
According to the present invention, the control means first searches the position of the material presentation table with the reference point as a target, adjusts the photographing direction of the photographing means, and further adjusts the zoom magnification to photograph the material presentation table. The document presentation table shooting process is performed. Next, the material is photographed by performing a material photographing process of recognizing the size of the material set on the material presentation table and adjusting the photographing direction and zooming up. By automatically performing these processes, the material according to the size can be photographed accurately and promptly with an appropriate screen configuration, and the material image photographed by the photographing means is displayed on the display means.
[0007]
In the present invention, the reference point is a light point that emits a light amount equal to or greater than a predetermined threshold value, and the control means in the document presentation table photographing process includes the number of pre-registered light points and the positions of the light points. There is a form in which a material presentation table is searched and photographed based on information. Further, in the material photographing process, there is a form in which the material photographing process is performed by recognizing the size of the material based on the contrast between the material presentation table and the material. In that case, it is preferable that the material setting surface of the material table is set to black or a high density color.
[0008]
In the present invention, when the reference point that is the target when searching the document presentation table is a light spot as described above, the light emitted from the light spot is invisible light of a specific wavelength, while only this invisible light is used. It includes a form in which an optical filter that can be photographed is detachably provided in the optical path of the lens of the photographing means. Examples of invisible light include infrared light, and an infrared light transmission filter that transmits only infrared light is used as the optical filter in that case. In this embodiment, at the time of the document presentation table photographing process, the reference point, that is, the light spot is photographed with the optical filter inserted in the optical path of the lens of the photographing means. The state is taken out from the optical path of the lens of the photographing means (hereinafter referred to as the removed state), and the next document photographing process is started. If the light emitted from the light spot is invisible light, the light spot does not stand out when the illumination is darkened, and a misleading impression is not given to the audience.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a state in which a presentation is performed using the material photographing apparatus of one embodiment, P is a presenter, 10 is a material presentation table, 20 is a screen (display means), 30 is a video camera such as a video camera. (Photographing means). The camera 30 photographs a material (white paper on which text, drawings, etc. are written: S in FIG. 2) placed on the material presentation table 10, and the material image photographed by the camera 30 is projected by a liquid crystal projector or the like not shown. Projected from the means. The presenter P explains the material while replacing the material with the material presentation table 10. Hereinafter, a material photographing apparatus according to an embodiment will be described in detail.
[0010]
The material presentation table 10 has a rectangular shape and is supported by a telescopic stand 11 extending in the vertical direction, and at least the entire surface thereof is black as shown in FIG. The material S is placed on the surface, and the material presentation table 10 is provided with an illumination lamp 12 such as a white LED that illuminates the material S. Further, light points (reference points) 40 for emitting infrared light, which is invisible light of a specific wavelength, are provided at two diagonal points (in this case, the upper left corner and the lower right corner) of the material presentation table 10. ing. This light spot can be constituted by an LED or the like.
[0011]
As shown in FIG. 1, the camera 30 is attached to a ceiling of a room via a hanging metal fitting 50. The camera 30 has a zoom function, and can freely pan (left and right swing) and tilt (vertical swing). As shown in FIG. 3, the camera 30 includes a lens 31. In front of the lens 31, an infrared light transmission filter (hereinafter referred to as an optical filter) 32 that can photograph the light spot 40 is provided. The lens 31 is mounted so that it can be switched between the state inserted into the optical path of the lens 31 and the state off the optical path of the lens 31. As shown in the figure, the camera 30 includes a filter switching unit 33 that switches the optical filter 32, a pan / tilt drive unit 34 that performs pan / tilt, and a zoom adjustment unit 35 that adjusts the zoom magnification. Furthermore, it has a control unit (control means) 36 for controlling the operations of the filter switching unit 33, the pan / tilt drive unit 34, and the zoom adjustment unit 35. The control unit 36 of the camera 30 automatically controls the shooting of the material S as follows.
[0012]
First, the camera 30 searches the two diagonal light spots 40, 40 provided on the document presentation table 10 and photographs the document presentation table 10 with the optical filter 32 inserted in the optical path of the lens 31. . Next, the optical filter 32 is removed, the size of the material S is recognized in this state, and the material S is photographed. As shown in FIG. 4, first, the optical filter 32 is inserted (step S1), and then pan / tilt is performed to search the coordinates of the two light spots 40 (step S2). When 40 is recognized within the angle of view of the camera 30, pan / tilt is further performed to position the center of the material presentation table 10 derived from the two light spots 40 at the center of the angle of view of the camera 30 (step S3).
[0013]
Subsequently, the zoom is performed so that the two light spots 40 protrude from the angle of view of the camera 30, and the material presentation table 10 is photographed at a predetermined size (step S4). Next, the optical filter 32 is removed (step S5), the size of the material S is detected from the contrast between the black material presentation table 10 and the white material S (step S6), and the angle of view is determined from the width and height of the material S. Calculation is performed (step S7), pan / tilt is performed as necessary, the center of the material S is positioned at the center of the angle of view, and thereafter the zoom-up is performed to photograph the material S at a predetermined size (step S8). The material image photographed by the camera 30 is projected on the screen 20, and the presenter P explains the material.
[0014]
The operation of step S2 in FIG. 4, that is, a specific example of searching for the coordinates of the two light spots 40 will be described. Here, the control unit 36 stores the number of light spots 40 (two in this case) to be searched provided on the material presentation table 10, and a predetermined threshold relating to the amount of light is set. In this case, for example, the number of pixels in the X direction (width direction) of the camera 30 is 640 pixels and the number of pixels in the Y direction (height direction) is 480 pixels. In this case, when there are only two light spots 40), the surrounding 42 pixels in the X direction and 21 pixels in the Y direction are registered as the light spot range, and the point (top) where the light amount of the light spot is the largest in that range is registered. locate.
[0015]
The light spot search will be described with reference to FIG. 5A. An operation for searching every other pixel in the X direction (horizontal direction) from the upper left of the angle of view is performed on every other pixel in the Y direction (downward). The light quantity is searched to detect a light spot that is equal to or greater than the threshold value (step S1). If a light spot that is equal to or greater than the threshold value is detected, it is determined whether or not the light spot range is unregistered (step S2). If it is not registered, it is determined whether or not the light spot range is a new light spot range (step S3). . If it is determined No in any of steps S1 to S3, the address is updated (step S4), and the process returns to step S1 to search for the next pixel. If it is determined Yes in step S3, the detected light spot range is set (step S5). As shown in FIG. 5B, the light spot range is a range of 42 pixels by 21 pixels before and after the X direction and 21 pixels in the Y direction. Next, the maximum light amount is updated while updating the maximum light amount within this range. The light spot, that is, the coordinates of the top of the light spot is detected (step S6), and the coordinates are registered as the coordinates of the first light spot (step S7). By performing this operation once again, the coordinates of the other light spot 40 are registered. Based on these two coordinates, the center of the material presentation table 10 can be positioned at the center of the angle of view of the camera 30.
[0016]
Next, a specific example of detecting the size of the material S from the operation of step S6 in FIG. 4, that is, the contrast between the black material presentation table 10 and the white material S will be described with reference to FIGS. 6 (a) and 6 (b). To do. From the upper left, for example, at a position of 80 pixels in the Y direction, a search is performed in the direction (right) from 0 to 639 pixels in the X direction to find a point (corresponding to a certain pixel) where the pixel has changed from black to white. Is recognized as the left end (step S1). Subsequently, for example, a search is performed from the upper right to 80 pixels in the Y direction, from the 639 pixels in the X direction to the 0 direction (left), and a point where the pixel has changed from black to white is found. (Step S2). Next, at the position of the pixel in the X direction about 10 pixels to the right of the leftmost pixel of the material S recognized in step S1, a search is performed in the Y direction from 0 to 479 pixels (downward), and the pixel changes from black to white. The detected point is found and recognized as the upper end of the material S (step S3). Subsequently, a search was performed in the X direction pixel position about 10 pixels to the left of the rightmost pixel of the material S recognized in step S2 in the Y direction 479 to 0 direction (upward), and the pixel changed from black to white. A point is found and recognized as the lower end of the material S (step S4). As described above, the size of the material S is detected by the contrast with the material presentation table 10.
[0017]
In the present embodiment, the process shown in FIG. 4, that is, first, the material presentation table 10 is set within the angle of view of the camera 30 with the two light spots 40 as targets, and then the material presentation table 10 is centered on the angle of view. After zooming in on the center, the document presentation table 10 is photographed (the document presentation table photographing process). Subsequently, the size of the document S is recognized based on the contrast between the document presentation table 10 and the document S, and the angle of view. The camera 30 captures an image with the entire surface of the material S zoomed up by a process of adjusting and zooming in to photograph the material S (material photographing process). By performing this series of processes automatically while being controlled by the control unit 36, the material S is photographed accurately and promptly with an appropriate screen configuration. As a result, when the material S is sequentially replaced on the material presentation table 10 and the presentation is performed while the materials S are photographed by the camera 30, even if the size of the material S to be replaced is different or the place where the material S is placed is slightly different. Since the shooting state of the camera 30 is optimally controlled corresponding to these variable elements, a smooth presentation can be performed. In addition, since it is not necessary to fix the relative position and distance between the material presentation table 10 and the camera 30 and is arbitrary, the degree of freedom in setting the presentation venue including the arrangement of both is improved.
[0018]
【The invention's effect】
As described above, according to the present invention, the material presentation table is photographed based on the position information of the reference point provided on the material presentation table, and then, based on the position information of the material set on the material presentation table. By automatically controlling the process of capturing the document by recognizing the size of the document, the document set on the document presentation stand can be photographed accurately and promptly with an appropriate screen configuration according to the size and position of the document. As a result, a smooth presentation can be made. In addition, since the arrangement of the data base and the camera can be arbitrarily set, the degree of freedom in setting the presentation venue is improved.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a state in which a presentation is performed using a material photographing apparatus according to an embodiment of the present invention.
FIG. 2 is a front view of a material presentation table according to an embodiment.
FIG. 3 is a block diagram illustrating a configuration of a camera according to an embodiment.
FIG. 4 is a flowchart showing a material photographing process by the material photographing apparatus according to the embodiment.
FIG. 5A is a flowchart showing an example of a specific operation for retrieving the coordinates of two light spots, and FIG. 5B is an image diagram of the operation.
6A is a flowchart showing an example of a specific operation for detecting the size of a material from the contrast between the material presentation table and the material, and FIG. 6B is an image diagram of the operation.
[Explanation of symbols]
10 ... material presentation table, 20 ... screen (display means),
30 ... Camera (photographing means) 32 ... Optical filter,
36 ... control unit (control means), 40 ... light spot (reference point),
P ... presenter, S ... material.

Claims (4)

A reference point for recognizing a material presentation table provided at least at two diagonal positions of a material presentation table on which a document or drawing material is set;
An imaging means having a zoom function for imaging the material presentation table including the reference point;
Control means for controlling photographing operation such as adjustment of the photographing direction and zoom magnification of the photographing means;
Display means for displaying a document image photographed by the photographing means,
The control means, based on the position information of the reference point imaged by the imaging means, a material presentation table imaging process in which the imaging means images the material presentation table,
Then, based on the position information of the article photographing means is set in the presentation table for photographing, have rows and materials imaging processes photographing means for photographing the article recognizes the size of the article,
The reference point is a light point that emits a light amount equal to or greater than a predetermined threshold, the light emitted from the light point is invisible light of a specific wavelength, and an optical filter that can photograph only the invisible light is the photographing A data photographing device, wherein the data photographing device is detachably provided in the optical path of the lens of the means . The material photographing apparatus according to claim 1, wherein the control means performs the material presentation table photographing process based on the number of light spots registered in advance and position information of the light spots.   The material setting surface of the material table is black or a high density color, and the control means recognizes the size of the material based on the contrast between the material setting surface and the material and performs the material photographing process. The material photographing apparatus according to claim 1. The material photographing apparatus according to claim 1, wherein the invisible light is infrared light.

Images