JP4304649B2 - Document presentation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a material presentation device that reproduces a captured image of a material such as a document or a three-dimensional object on a screen or the like via a monitor device, a projector, or the like.
[0002]
[Prior art]
As a type of audiovisual equipment used in conferences, academic conferences, exhibitions, etc., a subject such as a document is placed on a flat stage, and the subject is photographed from above while projecting light from a lighting device. 2. Description of the Related Art Data presentation devices that display on the screen of a monitor device or project on a screen with a projector have been used.
[0003]
Hereinafter, a material presentation device 50 according to the related art will be described with reference to FIGS.
In FIG. 6 which is an external perspective view of a material presentation device 50 according to the prior art, the material presentation device 50 includes a material table 51 which is a placement surface (stage) on which materials such as documents and entities are placed, and illumination of the materials. A projector 52 as a means, a camera (CCD) 53 for photographing the material table 51 from above and outputting a photographed image including the material as an image signal, an image processing unit 54 for performing signal processing of the image signal output by the camera 53, and And a video output line 55 for outputting an image signal (video signal) output from the image processing unit 54 to the outside of the apparatus.
[0004]
Note that the photographic lens mounted on the camera 53 may be a short focus lens with a fixed photographic angle of view. However, if the photographic lens is configured using a zoom lens with a variable focal length, the photographic image is set according to the set zoom position. Since the angle is variable, it is possible to use a method such as photographing and reproducing an entire image of a large subject, or enlarging and reproducing a portion of the subject. The arm structure for holding the camera 53 may be configured so that the camera 53 viewpoint (photographing direction) can be changed by changing the holding angle of the camera 53.
It is also possible to configure without including the projector 52.
[0005]
Returning to FIG. 6 again, the video signal output from the video output line 55 is input to a monitor device or a video projector device (both not shown) outside the device, and is displayed on the display board 51 on the display screen or screen of the monitor device. The material was presented by reproducing the captured image of the subject.
[0006]
Furthermore, the more detailed structure of the material presentation apparatus 50 is demonstrated using FIG. 7 which is a block diagram of the material presentation apparatus 50 based on a prior art.
[0007]
In the document presentation device 50, an image sensor 7a that generates and outputs an image sensor output signal that is an image signal from an optical image of a subject, which is realized by a CCD (Charge Coupled Device) or the like, and an image sensor output signal that is an analog signal. A pre-processing circuit A / D converter 7b that converts the signal into a continuous digital signal and outputs it as a scanned image signal, and arranges the scanned image signal, which is a continuous digital signal, according to the pixel configuration of the screen to be reproduced And an image processing circuit 7c for outputting a screen signal composed of predetermined vertical and horizontal pixels.
[0008]
Further, the material presentation device 50 outputs an input screen signal as a digital video signal to the D / A converter 7f in accordance with a timing signal input from the central processing unit 7e, and an input digital video signal. Is converted to an analog video signal that is a moving image signal, and is output to the outside of the device 50 in accordance with the timing signal described above, and is provided for reproduction to a monitor device or the like, and a D / A converter 7f.
[0009]
In addition, the material presentation device 50 controls the image sensor 7a to capture an image when receiving a subject image capturing command from the above-described central processing unit 7e and the central processing unit 7e, which controls the control of the device 50. A timing generator 7g for outputting the conversion timing to the pre-processing circuit A / D converter 7b is also provided.
[0010]
Note that the storage element 7j shown in FIG. 7 has a function of storing the above-described screen signal or digital video signal in response to a command, and can perform the following operations, for example.
That is, when changing the material on the material table 51 and attempting to transfer it to the next presentation material, if the transfer operation is reproduced as it is on the screen as it is, the quality will be insufficient. The operation is such that the stored image signal is stored in the storage element 7j and the stored image signal is continuously output during the replacement work, and the captured image of the next material is output and reproduced on the screen after the work is completed.
[0011]
Next, an outline of a signal flow for photographing a subject in the conventional material presentation device 50 will be described with reference to FIG.
When the operator of the apparatus 50 instructs the apparatus 50 to reproduce the subject image by pressing an operation button or the like, the central processing unit 7e outputs an image capture command to the timing generator 7g. The timing generator 7g controls the image sensor 7a in response to a command and starts photographing a subject (not shown) placed on the document table 51.
[0012]
The analog image signal output from the image sensor 7a is converted into a continuous digital image signal by the pre-processing circuit A / D converter 7b, and further converted into a screen signal in which a predetermined number of pixels are arranged vertically and horizontally by the image processing circuit 7c. The
The converted screen signal is buffered in the image rate converter 7d, and is output to the D / A converter 7f at a rate determined by the timing signal output from the central processing unit 7e. The signal is output to the outside of the device 50.
[0013]
[Problems to be solved by the invention]
The material presentation device 50 according to the above-described prior art has the following problems to be solved.
(1) If a mark for guiding the position where the material is to be placed is provided on the material table 51, the mark itself is photographed by the camera 53 and reproduced on a screen or the like.
Since the camera 53 is configured to capture the material table 51 from above and reproduce the captured image on a screen or the like, all the images within the shooting angle of view on the material table 51 are reproduced. For this reason, the upper surface of the document table 51 has no display and is configured to be plain.
On the other hand, when an operator places a material on the material table 51, a mark for guiding the position to be placed to the operator is often required. In particular, when a document is a document, it becomes unsightly when it is tilted and played back, so it is particularly necessary to display a ruler-like mark for regulating the position and angle of the document. However, it has not been possible to provide such a mark in the material presentation device 50 without being reproduced on a screen or the like.
[0014]
(2) The range on the material table 51 that is captured by the camera 53 and reproduced is unknown.
As described above, the camera 53 that is the photographing means of the apparatus 50 may be equipped with a zoom lens as a photographing lens, and the arm structure that holds the camera 53 changes the mounting (holding) angle of the camera 53. May be configured. Accordingly, in many cases, it is not uniquely determined which range is photographed and reproduced on the top surface of the document table 51.
[0015]
When replaying images of materials, there are many uses such as exchanging multiple documents one after another in order and playing them as materials for lectures, etc. In that case, the shooting angle of view remains fixed, It may be possible to remember the location of the document that was previously placed on the document table 51 and place the document in the same location next time, but such work is difficult if there is no mark on the document table 51. There are often.
Therefore, when reproducing the next document, first place the document at an approximate location on the document table 51, check the reproduction position of the reproduced document on the screen at that time, correct the position to place the document, and It is necessary to be in a proper position.
[0016]
Correcting the position of the document once placed on the document table 51 is a troublesome task for the person who plays it, and it is also unsightly for the audience watching the reproduction of the document on the screen to listen to the lecture. The appeal of the lecture was halved.
[0017]
(3) When a mark for guiding a place to place a document is displayed on the material table 51, the mark is hidden due to the placement of the material and cannot be seen.
The shooting range corresponding to the shooting angle of view is displayed on the upper surface of the document table 51 by lines, a set of continuous points, etc., and the person operating the device 50 places the document within the displayed range. A configuration that performs appropriate reproduction is also conceivable.
However, the material placed on the material table 51 is not limited to a small outline that fits within the display range, and it is naturally conceivable that the display itself may be obscured like a large document. Could not fulfill its function.
[0018]
(4) When the mark for guiding the place where the document is placed is displayed on the document table 51, it is not possible to cope with the change in the shooting angle of view of the camera 53 and the movement of the shooting point.
As described above, in a camera equipped with a zoom lens as a photographic lens, the photographic angle of view changes, so even if the photographic range is displayed on the document table 51, it is not possible to cope with it by displaying only one type of mark. In order to solve this, even if a plurality of marks are displayed on the document table 51 and each of them is made to correspond to a different shooting angle of view, which of the plurality of marks corresponds to the current shooting angle of view is determined. The operator cannot easily know.
Further, since the plurality of guidance marks displayed on the material table 51 are also included in the image taken by the camera 53, the display marks are also reproduced together with the material, and the performance of the apparatus 50 is improved. As described above, it becomes deficient in quality.
[0019]
Accordingly, the present invention has been made in view of the above-described problems, and in particular, a guide pattern, which is a mark for placing a material on the stage, is provided on the stage during the horizontal or vertical blanking period of the moving image signal output from the photographing means. By providing a projection means for optically projecting on the upper surface of the screen, a mark that is not reproduced on the screen can be provided on the data base (stage) so that the reproduced range on the stage can be grasped. It is an object of the present invention to provide a material presentation device that can cope with a change in the angle of view of a photographing unit and a change in a photographing direction without being hidden by placing the material.
[0020]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a material presentation device having the following configurations (1) to (4).
(1) A stage 1 for placing a material to be a subject, a photographing means 3 for photographing a material placed on the stage 1, generating and outputting an image signal, and an image signal output from the photographing means 3 Projection means 2i for projecting a guide pattern that serves as a mark of the position on the stage 1 onto the stage 1 during the horizontal or vertical blanking period. The projection means 2i rotates around the light source 4a and the rotation axis. And a polygon mirror provided with a plurality of reflecting mirrors for reflecting the light emitted from the light source 4a on the circumference, and the plurality of reflecting mirrors of the polygon mirror are configured to have different angles with respect to the rotation axis. Material presentation device characterized by being made.
(2) The material presentation device according to (1), wherein the axis direction of the rotation axis of the polygon mirror is a direction orthogonal to the incident direction of the light emitted from the light source 4a.
(3) The polygon mirror of the projection means 2i is composed of two polygon mirrors. The projection means 2i is separated by the light separation means 4b for separating the light emitted from the light source 4a in two directions and the light separation means 4b. The material presentation apparatus according to (2), further comprising: a first polygon mirror 4c and a second polygon mirror 4d having a straight line in a direction perpendicular to the light traveling direction as a rotation axis.
(4) The projecting means 2i is configured to project from an oblique direction with respect to the upper surface of the stage 1, and the guide pattern is projected from the projecting means 2i so as to correct the trapezoidal distortion on the stage 1 ( The material presentation device according to any one of 1) to (3).
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred example according to the embodiment of the present invention will be described with reference to FIGS.
1 is an external perspective view of a material presentation device according to a first embodiment of the present invention, FIG. 2 is a block diagram of the device in FIG. 1, and FIG. 3 is a timing for explaining the operation of the device in FIG. FIG. 4 is a schematic diagram for explaining the configuration of the mark projector included in the apparatus shown in FIG. 1, and FIG. 5 is a mark projector included in the material presentation apparatus according to the second embodiment of the present invention. It is a schematic diagram explaining the structure.
[0022]
First, the material presentation apparatus 10 which is a 1st Example is demonstrated.
[0023]
FIG. 1 is an external perspective view of a material presentation device 10 according to the present embodiment.
As shown in FIG. 1, the material presentation device 10 photographs a material table (stage) 1, which is a placement surface on which materials such as documents and entities are placed, a projector 2 that illuminates the material, and a material table 1 from above. Then, a camera (CCD) 3 that outputs an image signal of a captured image including material, an image processing unit 4 that performs signal processing of the image signal output from the camera 3, and a moving image signal (video signal) output from the image processing unit 4 ) To the outside of the apparatus is the same as the material presentation apparatus 50 according to the prior art described above. In addition, the photographing lens mounted on the camera 3 may be a zoom lens, the arm structure that holds the camera 3 may be configured so that the holding angle of the camera 3 can be changed, or the projector 2 may not be included. It is the same as the conventional one.
[0024]
Furthermore, the characteristic configuration of the material presentation device 10 of the present embodiment is that the mark projector 2i is provided, and the upper surface, which is the material placement surface of the material table 1, is also a mark projection surface. Details of these configurations will be described later.
[0025]
Next, the detailed configuration of the material presentation device 10 of the present embodiment will be described with reference to the block diagram of FIG.
As shown in FIG. 2, the material presentation device 10 includes an image sensor 2a, a pre-processing circuit A / D converter 2b, an image processing circuit 2c, an image rate converter 2d, a central processing unit 2e, and a D / A converter. 2f, the timing generator 2g, and the memory element 2j are the same as those of the conventional material presentation device 50, and the functions of those components are the same as the functions of the conventional configuration.
[0026]
On the other hand, the material presentation device 10 of the present embodiment is characterized in that it includes a timer 2h and the mark projector 2i described above.
The timer 2h receives an image capture state signal input from the central processing unit 2e via the synthesizer, and receives a timer output signal, which is a step signal that is turned off after the on state continues for a predetermined time, as a mark projector 2i. Is output.
The mark projector 2i receives a timer output signal input from the timer 2h, and projects a guide pattern, which is a mark for placing the material, on the upper surface of the material table 1 only when the timer output signal is on. Details of the projection operation will be described later.
[0027]
Next, transition of changes in each signal related to the operations of the timer 2h and the mark projector 2i will be described with reference to the timing chart of FIG.
First, as described above, in this apparatus, the camera 3 captures a subject on the document table 1 and generates a plurality of continuous screen signals.
That is, in the present apparatus 10, a shooting signal capture period (FIG. 3 video capture 3a) for generating one image and a blanking period (image capture period) between the image signal and the image signal are not present. Processing (projection) 3b) is repeated alternately.
The image signal generated and output by the apparatus 10 also has a screen signal section and a blanking section corresponding to each of these periods.
In the present embodiment, the above-described “blanking period” uses a vertical blanking period. However, a horizontal blanking period may be used as a different configuration, and this is also included in the present invention. Is. In a configuration different from the present embodiment in which the guide pattern is projected during the horizontal blanking period, the projection is not performed at the transmission interval of one photographing screen, but at the scanning and transmission intervals of one horizontal scanning line. Needless to say, a configuration based on a well-known technique of a television camera may be adopted so as to project a guide pattern.
[0028]
Furthermore, in this apparatus 10, a pulse-shaped image capture signal is output from the central processing unit 2e at the start of the video capture period 3a, and is also input to the timer 2h.
The timer 2h changes the timer output signal from the off state to the on state after waiting for a predetermined time (corresponding to FIG. 33a) equal to the capture time of one screen after inputting the image capture signal.
Furthermore, the timer 2h changes the timer output signal from the on state to the off state when an image capture signal for reading the next screen signal is input.
Alternatively, the timer 2h may be configured to change the timer output signal to the off state when a predetermined time elapses after the on state.
[0029]
That is, since the timer output signal is in the on state during the blanking period and is in the off state other than the blanking period, the mark projector 2i always checks the state of the timer output signal, and only when it is in the on state By projecting a guide pattern as a mark on the screen, the projected guide pattern is not photographed by the camera 3 and reproduced on a screen or the like.
[0030]
Next, the configuration of the mark projector 2i will be described.
FIG. 4 is a schematic diagram for explaining a main configuration of the mark projector 2i included in the material presentation device 10 of this embodiment.
As shown in FIG. 4, the mark projector 2 i has a light source 4 a that emits light in synchronization with a timer output signal. The light source 4a includes a light emitting diode that emits light in accordance with an energized current, a current amplifying unit, a switching unit, and the like. Needless to say, the light emitting source may be constituted by other than the light emitting diode.
Further, the mark projector 2i includes a half mirror 4b in which light emitted from the light source 4a is incident and branched and emitted in two directions, and first and second polygon mirrors 4c and 4d that are driven to rotate around a rotation axis. Is included.
[0031]
The first polygon mirror 4c is rotationally driven by a drive means and a control means (not shown) with a straight line perpendicular to the incident direction of light emitted from the light source 4a as a rotation axis.
The second polygon mirror 4d is driven to rotate in the same manner with a straight line parallel to the incident direction of the light beam as a rotation axis.
[0032]
Each of the polygon mirrors 4c and 4d has a disk shape having a thickness, and has a plurality of plane reflecting mirrors on the circumference. Further, each reflecting mirror is configured to have a different angle with respect to a reference line, for example, a rotation axis.
[0033]
An operation in which the mark projector 2i projects a guide pattern on the document table 1 will be described.
A light beam emitted from the light source 4a and incident on the half mirror 4b is a thin beam having a substantially dotted cross section, and is split into two beams by the half mirror 4b.
[0034]
One of the two beams enters the first polygon mirror 4c, is reflected by one reflecting mirror on the circumference, and forms an image as one point image on the data base 1. Further, at this time, since the first polygon mirror 4c is rotating, the point image on the document table 1 moves in one direction. The moving point image is recognized as a line image by the afterimage phenomenon of human vision. (For example, 4e1 in the projection pattern 4e in FIG. 4)
[0035]
Further, when the rotation of the first polygon mirror 4c advances and the beam comes into contact with the reflecting mirror at the next position, the angle of the reflecting mirror is different. Therefore, the straight line generated by the afterimage phenomenon is the above (4e1). 4e2 in FIG. 4, for example.
[0036]
On the other hand, a plurality of line images due to the afterimage phenomenon are also generated on the data base 1 by the beam incident on the second polygon mirror, and the rotational axes of the two are orthogonal to each other. Therefore, 4e3 and 4e4 in FIG. Thus, the line image is orthogonal to the above (4e1, 4e2).
Eventually, due to the rotation of the first and second polygon mirrors 4c and 4d, a plurality of orthogonal straight lines are generated on the material placing surface of the material table 1 by the afterimage phenomenon, forming a lattice pattern as a whole.
If this grid pattern is used as a mark of the position where the material is placed, the correct position can be placed, and the grid pattern is not reproduced on the screen or the like, and is projected onto the placed material. The grid pattern is not hidden by the data.
[0037]
In the example shown in FIG. 4, the light source 4a emits light continuously and a lattice pattern is generated. However, the light source 4a emits light intermittently to generate a pattern in which dots (dots) are arranged vertically and horizontally. It is also easy to do.
Furthermore, if the light emission interval of the light source 4a is optimally controlled, it is possible not to project a specific straight line or a specific dot of the dot pattern in the grid pattern 4e shown in FIG. It is possible to vary the size of the lattice-like or dot-like pattern generated on the table 1 and the position on the surface of the document table 1.
That is, it is easy to generate an optimum guide pattern according to the shooting angle of view and the shooting point by setting the zoom position of the shooting lens, the shooting direction, or by the operator.
[0038]
Next, a material presentation apparatus that is a second example according to the embodiment of the present invention will be described with reference to FIG.
The material presentation apparatus of the present embodiment has the same appearance (the perspective view of FIG. 1) and the schematic configuration (the block diagram of FIG. 2, the timing chart of FIG. 3) as the material presentation apparatus 10 of the first embodiment described above. have. The difference from the first embodiment is that the configuration related to the projection in the mark projector is different.
[0039]
In FIG. 5, which schematically illustrates the configuration of the mark projector of the material presentation device of the present embodiment, the light beam emitted from the light source 5a and the light source 5a composed of light emitting diodes are incident on the mark projector, and the diffracted light is received. It has two diffraction gratings 5b and 5c that emit in a predetermined direction.
[0040]
The first diffraction grating 5b emits a plurality of beams as diffracted light according to the beam incident from the light source 5a.
The second diffraction grating 5c receives the beam emitted from the first diffraction grating 5b, and further emits a plurality of beams as diffracted light according to the incidence.
In each diffraction grating, the exit angle (diffraction angle) with respect to the incident angle of the beam can be freely set in design, and a diffraction pattern determined by the design of each diffraction grating is generated on the upper surface of the data base 1 as a projection pattern.
[0041]
Further, in the present embodiment, the variable magnification movable lens 3b in the photographing zoom lens included in the camera 3 and the first diffraction grating 5b are configured to change their positions in conjunction with each other.
When the first diffraction grating 5b is at a different position, the diffraction images emitted from the first diffraction grating 5b and generated on the surface of the second diffraction grating 5c also have different sizes.
Accordingly, the first diffraction grating 5b is moved to a different position depending on the position of the variable magnification movable lens 3b, and a guide pattern having a size corresponding to the shooting angle of view is appropriately formed on the data base 1 by appropriately configuring. Can be generated.
[0042]
In addition, since the diffraction gratings 5b and 5c are small and light members, the material presentation device including the mark projector can be configured in a small size, a concise and low cost.
In addition, as a configuration different from the present embodiment described above, a configuration in which only one diffraction grating is provided and no interlocking mechanism with the zoom lens 3b is also conceivable. In that case, although there is no function of changing the guide pattern in conjunction with the zooming operation of the photographing lens, the configuration is simpler and more reliable. The above configuration is also included in the present invention.
[0043]
As a feature common to the first and second embodiments, it is possible to project the mark projector onto the document table 1 from an oblique direction by moving the position where the mark projector is disposed from the camera 3. Has a unique effect.
That is, when a landmark projector is realized with a configuration similar to that of a conventional optical projector using a configuration different from the present embodiment, for example, transparency (photo slide, transmission material such as an OHP material), a projected image of transparency In order to obtain a high quality (used for the mark pattern), the projection direction needs to be perpendicular to the projection plane of the document table 1 in order to maintain the geometric symmetry in the optical arrangement. Therefore, it is necessary to place a mark projector near the camera 3.
This leads to an increase in the size of the material presentation device, and since the device has a large structure above the device, there is a risk of inconveniences such as destabilization during stationary.
[0044]
On the other hand, in the first embodiment of the present invention described above, an image is formed by projecting the beam reflected from the polygon mirror onto the surface of the document table 1, so that the image is projected from an oblique direction with respect to the upper surface of the document table 1. It is also possible to adopt a configuration that does this.
The deformation of the projection pattern (so-called trapezoidal distortion) can be sufficiently dealt with by previously deforming the projection pattern in the reverse direction and correcting the shape of the projected image by canceling out the distortion.
[0045]
Also in the second embodiment, since the guide pattern is generated from the diffraction image, projection from an oblique direction can be sufficiently performed, and the same effect as described above can be obtained.
[0046]
In the first and second embodiments of the present invention described above, the projection of the guide pattern on the stage is performed during either the horizontal blanking period or the vertical blanking period of the moving image signal picked up by the photographing means. Needless to say, the above-described effects of the present invention can be obtained even in the case of failure.
[0047]
【The invention's effect】
As described above in detail, the present invention optically projects a guide pattern, which is a mark for placing material on the stage, onto the upper surface of the stage during the horizontal or vertical blanking period of the moving image signal output from the photographing means. By providing a mark on the screen (stage) that will not be played back on the screen, it is possible to grasp the range to be played back on the stage, and the mark on the stage is hidden by placing the material. Thus, the present invention provides an effect of providing a material presentation device that can cope with a change in the angle of view of the photographing means and a change in the photographing direction.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a material presentation device that is a first example according to an embodiment of the present invention;
FIG. 2 is a block diagram of the apparatus of FIG.
FIG. 3 is a timing chart for explaining the operation of the apparatus of FIG. 1;
4 is a schematic diagram illustrating a configuration of a mark projector included in the apparatus of FIG. 1. FIG.
FIG. 5 is a schematic diagram illustrating a configuration of a mark projector included in a material presentation device that is a second example of the embodiment of the invention.
FIG. 6 is an external perspective view of a material presentation device according to a conventional technique.
7 is a block diagram of the apparatus of FIG.
[Explanation of symbols]
1 Data stand (stage)
2i mark projector (projection means)
3 Camera (photographing means)
4c, 4d Polygon mirror 4e Projection pattern, lattice pattern (guide pattern)
5b, 5c Diffraction grating (Diffraction means)
5d projection pattern, dot pattern (guide pattern)
10 Material presentation device

Claims (4)

A stage on which the subject material is placed;
By photographing the article was placed on the stage, a capturing means for generating and outputting an image signal,
The horizontal or vertical blanking period outs image signals before output from the imaging means, a projecting means for elevation projecting a guide pattern composed of a mark position on previous SL stage on the stage,
Equipped with a,
The projection means includes
A light source, and a polygon mirror that rotates around a rotation axis and includes a plurality of reflecting mirrors that reflect light emitted from the light source on a circumference, and the plurality of reflecting mirrors of the polygon mirror includes: document presentation device angle formed with the rotary shaft, characterized that you have been configured differently, respectively. The material presentation apparatus according to claim 1 , wherein an axial direction of a rotation axis of the polygon mirror is a direction orthogonal to an incident direction of light emitted from the light source . Polygon mirror of the projection means comprises two polygonal mirror, the projection means includes a light separation means for separating the light emitted from the light source in two directions, each separated by the light separating means of the light presentation device according to 請 Motomeko 2 you; and a first polygon mirror and the second polygon mirror to the direction of the linear axis of rotation perpendicular to the direction of travel. The projection means is configured to project from an oblique direction with respect to the stage upper surface,
The material presentation apparatus according to claim 1, wherein the guide pattern is projected from the projection unit so as to correct a trapezoidal distortion on the stage .

Images