JP2003018369A - Document camera - Google Patents

Abstract

(57) [Problem] To provide a document camera capable of simplifying the structure and reducing the size of the apparatus. SOLUTION: An image pickup means 13 is arranged so as to pick up an image of a document MS obliquely, and converts a document image of the document MS picked up obliquely by the image pickup means 13 into an image picked up from the front.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document camera for capturing an image of an original document placed on a document table through image capturing means and outputting document image data based on the image capture result.

[0002]

2. Description of the Related Art A document camera for picking up an image of an original placed on an original table via an image pickup means such as a CCD camera is used, for example, in a presentation or a conference, and the image data of the imaged original is read by a projector or a monitor television. Output to a display device such as John.

In a conventional document image camera, an image pickup means is arranged in front of a document so that the image of the document is not distorted or defocused. That is, normally, the original is placed horizontally on the original table and the image pickup means is arranged above the original in the vertical direction. Further, in order to accurately image the entire original, the image pickup means is arranged at a predetermined distance from the original, for example, in the case of an A4 size original, a distance of about 1.5 times the vertical length of A4. There is. Further, in order to illuminate the entire document uniformly, an illuminating device for illuminating the document is often arranged above the document at a distance similar to that of the image pickup means.

[0004]

However, in the conventional document image camera, since the image pickup means and the illumination device are arranged above the document, the entire device tends to be large. for that reason,
There has been proposed a technique for compacting the entire device by folding a support portion (support) that supports the image pickup means and the illumination device when not in use to store the image pickup means and the illumination device. However, the support structure is likely to be complicated, and it is difficult to promote cost reduction.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a document camera capable of simplifying the structure and reducing the size of the apparatus.

[0006]

In order to solve the above-mentioned problems, the document camera of the present invention captures an image of a document (MS) placed on a document table (11) through image capturing means (13), A document camera for outputting document image data of the original (MS) based on an image capturing result, wherein the image capturing means (13)
Arranged so that the original (MS) is imaged obliquely,
The original document (M
It is characterized by comprising an image conversion means (14) for converting the image of the calligraphy of S) into an image picked up from the front. In this document camera, the image pickup means (13) is arranged so as to pick up an image of a document (MS) from an oblique direction, so that the image pickup means (1
The support structure for supporting 3) can be simplified and the device size can be made compact. Further, the image of the document image of the original document (MS) imaged obliquely is converted into an image imaged from the front by the image conversion means (14).

In this case, the image conversion means (1
4) is a first for calculating the document image data of the image captured from the front, based on the positional relationship between the document (MS) and the image capturing means (13) and the image capturing result of the image capturing means (13). It is preferable to have a calculation unit (32). The first calculation unit (32) can convert an image of a document image of a document (MS) captured obliquely into an image captured from the front.

Further, the image conversion means may have a distortion correction section for optically correcting the distortion of the image of the written image of the original document (MS) picked up obliquely by the image pickup means (13). The distortion correction unit can optically correct the distortion of the document image of the original (MS) caused by the oblique image pickup.

Further, it is preferable to provide a focus shift adjusting means for adjusting the focus shift of the image pickup means (13) with respect to the entire document (MS). As a result, the defocus that occurs when the image is captured obliquely is adjusted.

The defocus adjustment means drives a predetermined optical system (25) to change the focal position of the image pickup means (13), and the drive section (28). The image pickup means (1
3) A storage unit (30) for storing the image pickup result, and the document data of the entire original document (MS) whose magnification is corrected by adjusting the defocus based on the image pickup result stored in the storage unit (30). And a second calculator (33) for calculating In this case, out of the image of the calligraphy image taken at each focus position, the image of the calligraphy image in the region where the defocus is small is taken out for each focus position, the magnification is corrected, and they are combined to obtain the defocus. It is possible to calculate the document image data of the entire adjusted original document (MS).

Further, the defocus adjustment means may have a tilt mechanism for inclining the focusing surface of the image pickup means (13) with respect to the original (MS). As a result, the manuscript (M
S) It is possible to easily adjust the defocus in the entire area or a wide area of the original.

A transparent plate (43) with which the writing screen of the original (MS) is brought into contact is arranged on the original table (41), and the image pickup means (13) is provided with the transparent plate (43). The document table (41) may be arranged in a housing so as to capture an image of a written image of the document (MS) via the. In this case, since the image pickup means (13) is arranged in the case forming the document table (41), the device size can be further reduced. Further, the illumination condition of the original (MS) is less likely to be influenced by external factors.

A reflecting member (54) that reflects the light from the original (MS) and makes it incident on the image pickup means (13).
May be provided. In this case, by capturing the image of the original (MS) through the reflecting member (54), it is possible to obtain a calligraphic image close to the image captured from the front. for that reason,
It is possible to easily convert an image of a document image of a document (MS) imaged obliquely into an image imaged from the front.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The document camera of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a first embodiment of a document camera according to the present invention. The document camera 10 includes a document table 1 on which a document MS is placed.
1. An illumination device 12 that emits illumination light that illuminates the original MS.
Imaging camera 1 as imaging means for imaging the original MS
3, a control unit 14 for controlling them, and the like.

In the document camera 10 of this embodiment, the illumination device 12 and the image pickup camera 13 are integrally arranged on the document table 11. That is, the document table 11 is provided with a mounting surface 20 for mounting the document MS, and the mounting surface 20 is illuminated at the same level as the mounting surface 20 or at a height position close to the mounting surface 20. The device 12 and the imaging camera 13 are arranged.

The illuminating device 12 is divided and arranged on both sides of the mounting surface 20, and illuminates the mounting surface 20 from a side oblique position which is near the same plane as the mounting surface 20. As the illuminating device 12, for example, one having one or more fluorescent lamps and emitting illumination light of a predetermined wavelength by high frequency lighting is used. A strobe used for an electronic camera or the like may be used as the lighting device.

The image pickup camera 13 is arranged on the far side of the placing surface 20 where the illumination device 12 is not provided, and is placed on the same plane as the placing surface 20 from a side oblique position near the original. Image the MS. Further, the image pickup camera 13 includes a lens group 25, an image pickup element (CCD) 26, a drive substrate 27 for the CCD 26, a drive section 28 for driving a part of the optical system of the lens group 25, and the like, and a drive section 28. By driving a part of the optical system in the lens group 25 via the
It is configured to change the focal position of 26. Depending on the design of the camera lens, changing the focus position also changes the magnification. Therefore, the magnification is CC
It is finely set for each predetermined divided area (for example, areas a, b, c, d described later) set on the imaging surface of D26. The image of the document image of the document MS incident on the CCD 26 is converted into an electric signal by an A / D converter (not shown) or the like and sent to the control unit 14. The lens group 25,
The CCD 26, the drive substrate 27, the drive unit 28, the control unit 14, and the like constitute a defocus adjustment unit that adjusts the defocus of the imaging camera 13 with respect to the document MS.

In the document camera 10, the mounting surface 2
The imaging camera 13 is located at a diagonal side position on the same plane as 0.
Is placed and the original MS is imaged from an angle, C
The image of the document image of the document MS incident on the CD 26 is distorted with respect to the image captured from the front. Therefore, the control unit 14 converts the image of the document image of the original MS, which is obliquely captured by the imaging camera 13, into an image of the image captured from the front.

FIG. 2 is a diagram schematically showing a side view of the positional relationship between the original MS and the image pickup surface of the CCD 26. Here, the angle formed by the optical axis incident on the image pickup surface of the CCD 26 and the original MS is θ. In FIG. 2, the length X on the original MS (the length in the left-right direction on the paper surface) is the CCD 26.
On the imaging surface of, the length a = X · sin θ. Therefore, the calculation in the opposite direction, that is, X = a / sin θ
The image of the original MS sent from the CCD 26 can be converted into an image picked up from the front by the calculation using the conversion formula of. Actually, the above formula is often insufficient because distortion occurs in the width direction (perpendicular to the plane of the drawing) due to oblique image pickup. The conversion formula is the original MS and CCD2.
Based on the positional relationship with 6 (imaging surface), it is finely determined for each predetermined divided area (for example, areas a, b, c, d described later) set on the imaging surface of the CCD 26.

In the document camera 10, the mounting surface 2
Since the illuminating device 12 is arranged in a laterally inclined position near the same plane as 0 and illuminates the original MS from an oblique angle close to the side,
The area near the illuminating device 12 is bright, and the central area of the original MS is darker. Therefore, the control unit 14 corrects the illumination unevenness of the image of the document image of the document MS. The illumination unevenness is determined by the arrangement position of the illumination device 12 and the like, and can be obtained by measuring the illuminance distribution on the mounting surface 20. The control unit 14 stores in advance correction data for correcting uneven illumination, and corrects uneven illumination of the image of the document image of the original MS based on the corrected data.

Further, in the document camera 10, since the document camera MS images the document MS from an angle, it is difficult to put the entire document within the focal depth of the CCD 26 at one time. That is, it is difficult to focus on the entire document. Therefore, the document camera 10 images the document MS multiple times while changing the focus position of the CCD 26, and calculates the document image data of the entire document in which the defocus is adjusted based on the imaged results of the plurality of times.

FIG. 3 is a diagram schematically showing an example of the relationship between the focal position and the focal depth of the CCD 26 with respect to the original MS. In FIG. 3, the image pickup camera 13 drives a part of the optical system in the lens group 25 via the drive unit 28 so that the focus position of the CCD 26 is changed to the aa plane, the bb plane, and the cc plane.
Surface and dd surface, respectively, and the whole original MS is imaged at each focus position. When the focus position is aligned with the aa plane, the document MS is focused in a predetermined area (area A shown in FIG. 3) located within the depth of focus Baa, and the other area (FIG. 3).
In each of the areas B, C, and D), the focus is deviated. In this case, the focused image is incident on the area a on the imaging surface of the CCD 26 corresponding to the area A on the original MS on the imaging surface 26a of the CCD 26. Similarly, CCD26
When the focal positions of are aligned with the bb plane, the cc plane, and the dd plane, respectively, b, c, and d on the imaging surface 26a of the CCD 26
A focused image is incident on each area of. The control unit 14 stores the imaging result captured at each focus position,
Only the in-focus image is taken out, the magnifications are respectively corrected, and they are combined (combined) to calculate the document image data of the entire original MS in which the defocus is adjusted. The focal positions of the CCD 26 described above are preset according to the depth of focus. Further, by setting the pitch of the focus positions to a value substantially equal to the depth of focus, it is possible to capture an in-focus image in all regions of the original MS with a small number of repetitions.

FIG. 4 is a schematic control block diagram of the document camera. The control unit 14 uses the imaging camera 1
Storage unit 30 for storing the image data of the original MS imaged by 3; the illumination correction unit 31 for correcting the illumination unevenness of the image data stored in the storage unit 30; Front image conversion unit 3 as first calculation unit
2. The image synthesizing unit 33 is provided as a second calculating unit that calculates the document image data of the entire document in which the defocus is adjusted by combining the image data with the magnification correction. In addition, the control unit 14
It is composed of a microcomputer (or minicomputer) including a PU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and performs various controls described above. It controls the entire device as a whole.

FIG. 5 shows an operation flow of the document camera 10. The document MS is placed on the document table 11 shown in FIG.
When the document is placed facing upward, the image pickup camera 13 detects the document MS
Is imaged from an angle. At this time, the imaging camera 13
A part of the lens group 25 is moved so that the focus position of the CCD 26 is adjusted to a predetermined position, that is, the aa plane shown in FIG. 3 (step 100). The control unit 14 stores the focused image on the image pickup surface of the CCD 26, that is, the image data of the area a in the storage unit 30 (step 101).

Next, the image pickup camera 13 includes a lens group 25.
Is moved to bring the focus position of the CCD 26 to the next predetermined position, that is, the bb plane shown in FIG. 3 (step 102). The control unit 14 stores the image data of the area b on the imaging surface of the CCD 26 in the storage unit 30 (step 1
03).

Similarly, the CCD 13 is used by the image pickup camera 13.
The focus positions of 26 are the remaining predetermined positions, c shown in FIG.
Aligned to the c-plane and the dd-plane respectively, CCD 26 at that time
The in-focus image on the image pickup plane, that is, each image data of the areas c and d is stored in the storage unit 30 shown in FIG. 4 (step 104).

Next, the illumination correction unit 31 corrects the illumination unevenness of the image data of the original MS stored in the storage unit 30 based on the preset correction data (step 10).
5). Then, the illumination-corrected image data is sent to the front image conversion unit 32.

The front image conversion unit 32 converts the image of the document image of the original MS imaged obliquely using the above conversion formula into an image imaged from the front (step 106). Then, each image data is sent to the image combining unit 33.

The image synthesizing unit 33 corrects the magnification of the image data of the areas a, b, c and d and synthesizes the image data into one image (step 107). As a result, the document image data of the entire document is completed. This document image data is output to a display device such as a projector or monitor television.

As described above, the document camera 10 according to the present embodiment.
Then, although the original MS is imaged obliquely, the image distortion and defocus caused by the original MS are corrected by using image processing techniques such as magnification correction and image composition to obtain an image of the original MS as a front image. The image of the calligraphy can be output.
Since the imaging camera 13 and the illumination device 12 are integrally arranged on the document table 11 and arranged on the same plane as the mounting surface 20 or at a height position close to the same, the imaging camera 13
The structure for supporting the lighting device 12 can be simplified. Therefore, it is possible to reduce the size of the device and reduce the cost of the device.

FIG. 6 is a schematic view showing a second embodiment of the document camera according to the present invention. It should be noted that those having the same functions as those of the document camera 10 shown in FIG. 1 above are designated by the same reference numerals, and the description thereof will be omitted or simplified.

The document camera 40 shown in FIG. 6 is different from the document camera 10 shown in FIG. 1 in that the image pickup camera 13 is arranged in the housing constituting the document table 41. Also, the manuscript M
S is placed downward on the placing surface 42 of the document table 41.
On the mounting surface 42 of the document table 41, a transparent plate 43 on which the writing screen of the document MS is brought into contact is arranged.
Captures the image of the document image of the document MS through the transparent plate 43 obliquely. Further, the illuminating device 12 is arranged in the housing of the document table 41 so as to illuminate the document MS via the transparent plate 43. The document camera 4 of the second embodiment
Since 0 also captures the document MS from an oblique direction, it is configured to convert the image of the document image of the document MS captured by the image capturing camera 13 into the image captured from the front, as in the above embodiment.

In the document camera 40 of the second embodiment described above, the image capturing camera 1 is arranged so as to capture the document MS obliquely.
3 and the illuminating device 12 are arranged, the structure for supporting the imaging camera 13 and the illuminating device 12 can be simplified and the device size can be reduced, as in the first embodiment. Moreover, since the image pickup camera 13 and the illumination device 12 are arranged in the housing that constitutes the document table 41, it is advantageous in downsizing the device size. Further, since the imaging camera 13 and the illuminating device 12 are arranged in the housing of the document table 41 and the document MS is illuminated by almost only the illumination light of the illumination device 12, the illumination condition of the document MS is other illumination light in the room. Less susceptible to external factors such as sunlight and sunlight. Therefore, the uneven illumination can be corrected more reliably.

FIG. 7 is a schematic diagram showing a third embodiment of the document camera according to the present invention. The document camera 10 shown in FIG. 1 and the document camera 40 shown in FIG.
Those having the same function as the above are denoted by the same reference numerals, and the description thereof will be omitted or simplified.

The document camera 50 shown in FIG. 7 is similar to the document camera 40 of the second embodiment shown in FIG. 6 except that the imaging camera 13 and the illuminating device 12 are arranged in the housing of the document table 51. The document MS is placed on the placement surface 52 of the document table 51 downward. Also, unlike the above-described embodiments, the document camera 50 includes a reflecting mirror 54 as a reflecting member that reflects the light from the document MS and makes the light incident on the imaging camera 13. The reflection mirror 54 is arranged in the housing and is arranged between the document MS and the image pickup camera 13.
On the mounting surface 52 of the document table 51, a transparent plate 53 with which the writing screen of the document MS is brought into contact is arranged.
Is the original MS through the reflection mirror 54 and the transparent plate 53.
Image of the calligraphy. The reflection mirror 54 may be formed by depositing a metal film as a reflecting material on glass or film. When a film having a relatively low surface accuracy is used as the reflecting mirror 54, it is preferable to predefine data for correcting the influence of the surface accuracy on the imaging result.

In the document camera 50 of the third embodiment, by capturing the image of the original MS via the reflecting mirror 54, a document image close to the image captured from the front can be obtained. Therefore, it is possible to easily convert the image of the document image of the original MS imaged obliquely into the image imaged from the front.

That is, as shown in FIG. 8, since the reflection mirror 54 is arranged between the original MS and the image pickup camera 13, the position of the original MS to be imaged is virtually determined with respect to the image pickup camera 13. (MS 'shown in FIG. 8).
Therefore, the substantial inclination (tilt angle) θ of the imaging camera 13 with respect to the document MS becomes large, and the document MS can be imaged from a position close to the front. In this case, a wide area can be focused at one time, and the number of times of repeatedly capturing an image of the document MS for adjusting the defocus can be reduced. Also,
It is possible to reduce the burden of calculation when converting to an image captured from the front and suppress the occurrence of errors. From these things,
With the document camera 50, it is possible to easily and accurately convert the image of the document image of the original MS captured obliquely into the image captured from the front.

Moreover, since the image pickup camera 13 and the illuminating device 12 are arranged in the housing of the document table 51, and the document MS is illuminated by almost only the illumination light of the illuminating device 12, the same as in the second embodiment. The illumination condition of the document MS is less likely to be affected by other factors such as other indoor lighting and sunlight, and the uneven illumination can be corrected more reliably. Moreover, since the illuminating device 12 can be arranged at a position close to the front of the original MS, the uneven illumination itself can be reduced.

Further, the document camera 5 of the third embodiment.
At 0, since the original MS can be imaged from a position substantially close to the front, distortion around the visual field is small, and the lens design is facilitated accordingly. In the first and second embodiments, the distortion of the image of the original MS in the vicinity of the visual field, that is, in the portion close to the imaging camera 13 is large, and it is preferable to perform optical design to suppress this. Further, even when the periphery of the visual field is distorted, the distortion can be corrected by measuring the data related to the distortion in advance.

In each of the above-described embodiments, the image distortion and defocus caused by obliquely picking up the original is corrected mainly by using the image processing technique. However, the present invention is not limited to this. Image distortion and defocus may be optically corrected. FIG. 9 is an example of a configuration for optically correcting image distortion caused by obliquely capturing an original, FIG.
Reference numeral 0 indicates an example of a configuration for correcting the defocus that occurs when the document is obliquely imaged.

As shown in FIG. 9 (a), when a subject is imaged obliquely, the subject image is distorted in the width direction due to the effect of perspective. On the other hand, as shown in FIG. 9B, if the lens surface and the imaging surface are arranged so as to be parallel to the subject, this distortion in the width direction can be corrected. Therefore, in the document camera of the present invention, by adjusting the arrangement angle of the lens group of the imaging camera, it is possible to optically correct the distortion of the document image of the original document imaged obliquely by the imaging camera.
Alternatively, it is possible to bring the image of the above-mentioned calligraphy image closer to a state in which the image is captured from the front. By optically correcting the image distortion, it is possible to easily convert an image captured obliquely into an image captured from the front. In this case, the distortion correction unit that optically corrects the distortion of the image of the document image of the document is configured by the lens group and the adjusting unit that adjusts the arrangement angle of the lens group.

As shown in FIG. 10A, when a deep object is imaged from an angle, the focus plane (focusing plane) usually occurs parallel to the image plane, so that the focus is limited to a very limited range. Only fits. On the other hand, as shown in FIG. 10B, by tilting the lens system in accordance with the tilt of the surface to be focused (tilt), the entire subject is focused without changing the aperture value. You can Therefore, in the document camera of the present invention, by adjusting the arrangement angle of the lens group of the image pickup camera and tilting the focusing surface, the defocus of the image pickup camera with respect to the entire original can be optically adjusted. By optically adjusting the defocus of the image, it is possible to easily adjust the defocus in the entire document or in a wide area of the document. In this case, the lens group, the adjusting means (tilt mechanism) for adjusting the arrangement angle of the lens group, and the like constitute the defocus adjusting means for adjusting the defocus of the imaging camera.

It is to be noted that the present invention includes a device having a function similar to that of the control unit 14 described above provided in a device different from the document camera, for example, a display device such as a projector. Further, the document camera and the display device such as a projector may be integrated. In that case, since the document camera can be made compact, the size of the entire apparatus can be suppressed even if it is integrated.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such examples. It is obvious to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention is also applicable to them. Be understood to belong to.

[0045]

As described above, according to the document camera of the present invention, the image pickup means is arranged so as to pick up an image of a document obliquely. Therefore, the support structure for supporting the image pickup means can be simplified and the apparatus size can be reduced. Can be made compact and the cost of the device can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a first embodiment of a document camera according to the present invention.

FIG. 2 is a diagram schematically showing a positional relationship between a document and an image pickup surface of a CCD.

FIG. 3 is a diagram schematically showing an example of the relationship between the focal position and depth of focus of a CCD with respect to a document.

FIG. 4 shows a schematic control block diagram of the document camera.

FIG. 5 is a diagram showing an example of an operation flow of the document camera.

FIG. 6 is a schematic view showing a second embodiment of the document camera according to the present invention.

FIG. 7 is a schematic view showing a third embodiment of the document camera according to the present invention.

FIG. 8 is a luminous flux diagram for explaining a state of an image of a document imaged through a reflection mirror.

FIG. 9 is a diagram schematically showing an example of a configuration for optically correcting image distortion.

FIG. 10 is a diagram schematically showing an example of a configuration for optically correcting defocus of an image.

[Explanation of symbols]

MS manuscript 10, 40, 50 Document camera 11,41,51 manuscript table 12 Lighting device 13 Imaging camera (imaging means) 14 Control unit (image conversion means) 20, 42, 52 mounting surface 25 lens groups 26 Image sensor (CCD) 27 Drive board 28 Drive 30 storage 31 Lighting correction unit 32 Front image conversion unit (first calculation unit) 33 Image synthesizer (second calculator) 43,53 transparent plate 54 Reflective mirror

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/222 H04N 101: 00 5/232 1/10 // H04N 101: 00 F term (reference) 5B047 AA01 BA02 BB04 BC05 BC14 CA17 5B057 AA20 BA02 BA11 BA15 BA17 CC01 CD12 CH08 DA17 5C022 AA13 AC69 CA07 5C072 AA01 BA01 CA02 DA02 DA23 EA05 EA08 LA11 5C076 AA40 BA06

Claims (8)

[Claims] 1. A document camera that captures an image of a document placed on a document table through image capturing means, and outputs document image data of the document based on the image capture result, wherein the image capturing means captures the document. A document camera, which is arranged so as to be obliquely imaged, and which is provided with image conversion means for converting an image of a document image of the document imaged obliquely by the image capturing means into an image imaged from the front. 2. A first calculator that calculates the stroke data of the image captured from the front, based on the positional relationship between the document and the image capturing unit and the image capturing result of the image capturing unit. The document camera according to claim 1, further comprising: 3. The image conversion means includes a distortion correction section for optically correcting distortion of an image of a written image of the original image picked up obliquely by the image pickup means. Document camera described in. 4. The document camera according to claim 1, further comprising defocus adjustment means for adjusting defocus of the image pickup means with respect to the entire document. 5. The focus shift adjusting means drives a predetermined optical system to change a focus position of the image pickup means, and the image pickup means for each focus position set via the drive portion. And a storage unit that stores the image pickup result of the second image processing unit, and a second calculation unit that calculates, based on the image pickup result stored in the storage unit, magnification data is corrected for each focus position and the defocus is adjusted for the entire document. The document camera according to claim 4, further comprising a calculation unit. 6. The document camera according to claim 4, wherein the defocus adjusting means has a tilt mechanism for inclining a focusing surface of the image pickup means with respect to the original. 7. A transparent plate, which is in contact with the document screen of the document, is arranged on the document table, and the image pickup means captures an image of the document image of the document through the transparent plate. The document camera according to any one of claims 1 to 6, wherein the document camera is arranged in a housing that constitutes the document table. 8. The document camera according to claim 1, further comprising a reflecting member that reflects the light from the original document and makes the light incident on the image pickup unit.