JP2001217999A - Image input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image input device that can move within an image pickup range without the need for moving an image pickup head where the image pickup head hardly disturbs object replacement work. SOLUTION: When a camera movement adjustment switch 45a or 45b in the X direction is operated, a system control circuit 42 drives a motor 40 to move a CCD 31 forward or backward (Figure 1) with respect to an optical axis of a zoom lens 2 thereby moving an image pickup range of an image pickup head 1 backward or forward (Figure 1). When a camera movement adjustment switch 46a or 46b in the Y direction is operated, the system control circuit 42 drives a motor 41 to move the CCD 31 to the left or right (Figure 1) with respect to the optical axis of the zoom lens 2 thereby moving the image pickup range of the image pickup head 1 to the right or to the left (Figure 1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image input apparatus for capturing an image of a subject such as a material and outputting an image signal.

[0002]

2. Description of the Related Art For example, as disclosed in Japanese Patent Application Laid-Open No. 6-217172, a subject such as a printed matter and a three-dimensional object is placed on a stage, and the subject is imaged by an imaging head provided above the stage. 2. Description of the Related Art An image input device that displays an image on a monitor is known. Such an image input device is provided with an illuminating device for illuminating a subject in order to improve the S / N ratio of the image signal. The illuminated subject is imaged by an imaging head and output as an image signal.

[0003]

In the above-described apparatus, the image pickup head is disposed right above the subject, and there is a problem that when the operator replaces the subject, the image pickup head hinders the replacement operation. . In addition, there is a problem that it is necessary to rotate the imaging head when moving the imaging range of the subject.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image input apparatus in which an image pickup head is arranged on an end of a stage so as not to obstruct the operation of exchanging a subject, and an image pickup range can be moved without moving the image pickup head. It is to provide a device.

[0005]

FIG. 1 shows an embodiment of the present invention.
The present invention will be described with reference to FIG. (1) The image input device according to the first aspect of the present invention provides a subject 9
And a light image of a subject 9 mounted on the mounting table 4 is formed on the light receiving element 31 via the imaging lens 2, and an image signal corresponding to the formed light image is formed. An image pickup device 1 for outputting the image data, the image pickup device 1 is disposed above one end of the mounting table 4, and the relative positional relationship between the imaging lens 2 and the light receiving element 31 so as to image at least the entire area of the mounting table 4. The above-mentioned object is achieved by shifting. (2) The image input device according to the second aspect of the present invention
And a light image of a subject 9 mounted on the mounting table 4 is formed on the light receiving element 31 via the imaging lens 2, and an image signal corresponding to the formed light image is formed. The above-described object is achieved by providing the imaging device 1 for outputting and the tilting means 40 and 41 for shifting the relative positional relationship between the imaging lens 2 and the light receiving element 31. (3) According to a third aspect of the present invention, in the image input device according to the second aspect, an illumination device 12 for illuminating the subject 9 is provided,
The position of the illuminating device 12 is set such that the reflected light from the subject 9 of the illuminating device 12 does not enter the light receiving element 31 when the shift amount of the relative positional relationship by the tilting means 40 and 41 is minimum. It is characterized by. (4) The invention according to claim 4 is the image input device according to claim 3, wherein the imaging areas 59a, 59 set by the relative positional shifts by the tilting means 40, 41.
b, correcting means 4 for correcting shading in 59c
2 is provided. (5) The invention according to claim 5 is the image input device according to claim 4, wherein the correction means 42 is an imaging area 59a, 59b, 59c set by the relative positional shift by the tilting means 40, 41. It is characterized in that shading is corrected so that the luminance of each image is constant. (6) The image input device according to any one of claims 2 to 5, wherein the image input device is provided on the mounting table 4 and displays marks 11a to 11d indicating the image pickup region of the image pickup device 1. A display device 11 is provided. (7) According to a seventh aspect of the present invention, in the image input device according to any one of the second to sixth aspects, the mounting table 4 is extendable and contractible. (8) The image input device according to any one of claims 2 to 7, wherein the storage means 42 stores the shift amount of the relative positional relationship by the tilting means 40, 41.
And a control means 42 for controlling the amount of shift by the tilting means 40 and 41 based on the amount of shift stored in the storage means 42.

[0006] In the means for solving the above-mentioned problems, for the sake of simplicity, the drawings are associated with the embodiments, but the present invention is not limited to the embodiments.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a diagram showing an image input device according to an embodiment of the present invention. The image input device includes a platen 4 on which a subject 9 such as a document material or a book is placed, a support 3 provided on the platen 4,
The imaging head 1 is provided at the tip of the column 3 and captures an image of the subject 9 through the zoom lens 2. The illumination device 12 illuminates the subject 9 from above. The subject image captured by the imaging head 1 and subjected to predetermined image processing is displayed on a display monitor 100 such as a large video monitor.

A switch group 7 for operating an image input device is provided at an end of the document table 4, and a pointing device 8 such as a mouse is connected to the document table 4. The present apparatus can perform two kinds of operations: an operation by the switch group 7 and an operation of selecting and determining a menu from the operation menu displayed on the monitor 100 by the pointing device 8. A document table 5 which can be pulled out is accommodated in the document table 4.
The document table 5 can be pulled out as shown in FIG.
By pulling out the document table 5, for example, a subject 9 such as a newspaper that cannot be placed on the document table 4 can be placed on the document table 4 and the document table 5.

The center of an image pickup device, for example, a CCD built in the image pickup head 1 is configured to be movable with respect to the optical axis of the zoom lens 2 so that the image pickup center of the image pickup device and the optical axis of the zoom lens 2 are shifted. A tilt operation is performed. FIG.
5A and 5B are diagrams illustrating a tilt operation when the CCD is moved in one axis direction, wherein FIG. 7A illustrates a normal state, and FIG. 7B illustrates a state in which the tilt operation is performed. In the normal state shown in FIG.
The optical axis Lx of the lens 52a is provided so as to coincide with the center of the document table 4, and the optical axis Lx of the lens 52a and the CCD 51a
And the subject 9 placed at the center of the platen 4
With the center Sx. In the tilting operation state shown in FIG. 2B, the center Cx of the CCD 51b is
By shifting the optical axis Lx of b backward, the center Sx of the subject 9 to be imaged is shifted forward by SF from the optical axis Lx of the lens 52b. That is, even if the lens 52b is provided at a position where the optical axis Lx is SF away from the center of the document table 4, the subject 9 placed at the center of the document table 4 can be imaged. In FIG. 2A, a light beam 53a connecting both ends la and ra of the imaging range of the CCD 51a and the principal point of the lens 52a is 53a.
53a ', and the luminous flux connecting both ends lb, rb of the imaging range of the CCD 51b in FIG.
3b and 53b '.

That is, the imaging head 1 shown in FIG.
It is set as follows. Here, when the tilting operation is performed, the imaging range indicated by the light fluxes 53b and 53b 'moves with respect to the optical axis Lx of the lens 52b. Therefore, in the image input device of FIG. When the tilting operation is performed, the position where the image of the subject 9 placed on the document table 4 is picked up moves as a subject 9 ′ indicated by a two-dot chain line in FIG. Therefore, the subject image displayed on the monitor 100 moves without moving the subject 9, and the display screen is scrolled. In this way, even if the size of the subject 9 is larger than the imaging range of the imaging head 1, the mounting position of the
Can be imaged. The size of the subject 9 is the platen 4
If it is larger, the above-described original table 5 (FIG. 1)
By drawing out (b)), the subject 9 can be placed on the document table 5. Since the area 10 surrounded by the broken line is more likely to be hidden under the subject 9 when the subject 9 is placed, the switch group 7
And is provided at another position.

When the tilt operation is performed, the positions of the CCD 51b and the lens 52b deviate from the object center Sx. When replacing the subject 9 and changing the mounting position and orientation of the subject 9, if the operator performs the work from the front in FIG. The subject 9 seen from the operator is hardly shaded by the lens 52b, and the space on the subject 9 can be widely used.

FIG. 3 is a perspective view showing the object 9 removed, and the document table 4 accommodates an LCD 11. LC
D11 is a thin display capable of color display having a display area wider than the imaging range of the imaging head 1. Also, L
By covering the surface of the CD 11 with a diffusion plate,
The edge of the pixel displayed above is configured to be smooth. The LCD 11 can be turned on / off by a switch 43. When the subject 9 is a transmissive original, the LCD 11 is caused to display white,
D11 is used as a transmitted illumination device. When the LCD 11 is not used as a transmissive illumination device, that is, when imaging a reflective original, the LCD 11 is caused to perform black display. The markers 11a to 11d indicating the four corners of the imaging range of the imaging head 1 are displayed in red on the LCD 11, whereby the imaging range is indicated on the LCD 11. When the effective display area of the LCD 11 is wider than the imaging range of the imaging head 1, if the display positions of the markers 11a to 11d can be changed, even if the imaging range is changed during the above-described tilting operation, the position of the marker can be changed according to the tilting operation. The changed imaging range is L
The markers can be displayed on the CD 11 with the markers 11a to 11d.

The markers 11a to 11a displayed on the LCD 11
Since 11d is a reference for the position where the subject 9 is placed, it is displayed slightly wider than the actual imaging range of the imaging head 1 so that the imaging head 1 does not capture an image.

FIG. 4 is a block diagram of the image input device shown in FIGS. The subject light incident on the zoom lens 2 is formed on a CCD 31 serving as an image pickup device, and an image signal of the subject image subjected to photoelectric conversion is sent to a signal processing circuit 32. The image signal amplified by the signal processing circuit 32 and subjected to image processing such as gamma processing is sent to an A / D conversion circuit 33 and converted into a digital signal, and then guided to a memory 34 and temporarily stored. . The image data stored in the memory 34 is read out by a control signal from a camera system control circuit 37, sent to a D / A conversion circuit 35 via a synthesis circuit 36 described later, and converted into an analog signal. The video signal after the analog conversion is displayed on the monitor 100.

The monitor 100 can display a through image (moving image) and a freeze image (still image).
The through image display is performed as follows. A / D conversion circuit 3
The image data digitally converted in step 3 is sequentially stored in the memory 34, and the image data is sequentially read out, and the display image on the monitor 100 is sequentially updated. on the other hand,
The freeze image display is performed as follows. By stopping the new storage of the image data digitally converted by the A / D conversion circuit 33 in the memory 34, the memory 3
4 is continuously displayed on the monitor 100. The switching signal for displaying the live view image and the freeze image is output by the system control circuit 42. The drive signal for the CCD 31, the operation timing signals for the signal processing circuit 32, the A / D conversion circuit 33 and the D / A conversion circuit 35, and the write and read timing signals for the memory 34 are the camera control circuit. 37. In the signal processing circuit 32, correction of brightness and shading, which will be described later, is also performed.

The CCD 31 in the imaging head 1 has a motor 4
The zoom lens 2 is configured to be two-dimensionally movable in a plane perpendicular to the optical axis of the zoom lens 2 by the motor 0 and the motor 41. That is, the CCD 31 is moved in the X direction by the motor 40, and the CCD 31 is moved in the Y direction by the motor 41, and the above-described swing operation is performed. The zoom adjustment of the zoom lens 2 is performed by a zoom lens drive motor 38,
The focus adjustment of the zoom lens 2 is performed by a focus adjustment motor 39. The driving of each of the motors 38 to 41 is controlled by the system control circuit 42.

The switch group 7 includes zoom switches 44 a and 44 b for adjusting the magnification of the zoom lens 2,
X-direction switch 45 that performs a tilting operation by moving 1
a, 45b and Y-direction switches 46a, 46b;
Select setting condition file (SCENE FILE1) switch 4
8 and a (SCENE FILE2) switch 49, and a (MEM) switch 47 for storing the setting state in the selected setting condition file. What is a setting condition file?
This is a file for storing setting conditions such as the zoom magnification, tilting state, brightness and shading correction set by the switch group 7 and the operation menu. In this embodiment, two files are stored.

The system control circuit 42 controls the zoom (TELE
When the switch 44b is operated, the zoom lens drive motor 38 is driven to enlarge the subject image, and the zoom (WIDE
When the (side) switch 44a is operated, the zoom lens drive motor 38 is driven to reduce the subject image. When the X-axis tilt adjustment switch 45b is operated, the motor 40 is driven to move the CCD 31 backward (FIG. 2) and to move the imaging range of the imaging head 1 forward (FIG. 2). Conversely, when the X-direction tilt adjustment switch 45a is operated, the motor 40 is driven to move the CCD 31 forward (FIG. 2).
To move the imaging range of the imaging head 1 backward (FIG. 2). Similarly, the tilt adjustment switch 46 in the Y direction
When b is operated, the motor 41 is driven to move the CCD 31 to the right (FIG. 1), and to move the imaging range of the imaging head 1 to the left (FIG. 1). Conversely, when the tilt adjustment switch 46a in the Y direction is operated, the motor 41 is driven to move the CCD 31 to the left (FIG. 1) and to move the imaging range of the imaging head 1 to the right (FIG. 1). Let it.

The system control circuit 42 includes a zoom lens drive motor 38 and a tilt adjustment motor 40,
1 is detected, and the imaging range of the imaging head 1 is calculated from the operation amounts of the respective motors. The calculated imaging range is displayed on the LCD 11 by the markers 11a to 11d.

The system control circuit 42 calculates (SCENE FILE1)
When the (MEM) switch 47 is pressed while the switch 48 is pressed, the setting conditions such as the zoom magnification, tilting state, brightness, and shading correction set in the image input device at that time are stored in the setting condition file 1. Remember.
If the (MEM) switch 47 is pressed while the (SCENE FILE2) switch 49 is pressed, the above setting conditions are stored in the setting condition file 2. (SCENE FILE1) switch 48
Or, when only the (SCENE FILE2) switch 49 is pressed alone, the setting contents stored in the setting condition file 1 or the setting condition file 2 are read. For example, (S
When the (CENE FILE 2) switch 49 is pressed, the setting contents stored in the setting condition file 2 are read out, and based on the read out setting contents, the setting of the zoom adjustment, the tilting operation, the brightness, and the shading correction are performed. Is performed. The setting condition files 1 and 2 are stored in a setting condition file area allocated to a memory provided in the system control circuit 42.

The pointing device 8 is a device for designating an arbitrary point on the display screen of the monitor 100 represented by a mouse or the like. The pointer is indicated by, for example, an arrow to indicate a position specified by the pointing device 8 in the display image on the monitor 100. The display data for the pointer is output from the system control circuit 42 to the synthesizing circuit 36 as an overlay signal, and the image data captured by the imaging head 1 and stored in the memory 34 and the pointer display data are synthesized by the synthesizing circuit 36. Is done. The synthesized image data is supplied to a D / A conversion circuit 3
At 5, it is converted into an analog video signal and displayed on the monitor 100.

The display position of the pointer on the monitor 100 moves up, down, left, and right in the image displayed on the monitor 100 by moving the pointing device 8 up, down, left, and right. The movement of the pointer is performed by the system control circuit 42 detecting the operation content of the pointing device 8 and calculating the position where the pointer is displayed based on the detected operation content. The above-mentioned overlay signal, that is, data for on-screen display (OSD) is sent to the synthesizing circuit 36 so that the pointer is displayed at the calculated position, and is superimposed on the image data read from the memory 34. Will be displayed.

The usage time meter 50 measures the usage time of the LCD 11. When the LCD 11 is used as a transmissive illumination device for illuminating the subject 9 which is a transmissive original from below, LC
When the usage time of D11 becomes long, the brightness at the time of white display decreases due to the aging characteristics of the backlight light source provided in LCD 11, and the color temperature may decrease.
Therefore, when the usage time of the LCD 11 is longer than the predetermined time, the system control circuit 42 sets the LCD 11 to increase the color temperature for white display under predetermined conditions.
Control. Further, the color temperature control for a short time until the brightness is stabilized when the LCD 11 is turned on is similarly performed. That is, since the color temperature is low immediately after the LCD 11 is turned on, control is performed so as to increase the color temperature until a predetermined time elapses.

-Position of Illumination Device- The position of the illumination device of the image input device will be described. FIG.
FIG. 4 is a diagram illustrating the position of the lighting device when the tilting operation is not performed and when the tilting operation is performed, and is a diagram when the image input device in FIGS. 1 and 3 is viewed from the right side. If the subject 9 is glossy, the illumination light emitted from the illumination device is reflected by the subject 9, and the illumination device is arranged so that the reflected light is not picked up by the CCD. That is, assuming that the light beam connecting the right end ra of the imaging range of the CCD 51a and the principal point of the lens 52a when the tilting operation is not performed in FIG. 5 is 53a ', the light beam 53a' is reflected by the light beam 53a '' reflected by the subject 9. It is necessary to arrange the lighting device 12a on the outside (rear). On the other hand, a light beam connecting the right end rb of the imaging range of the CCD 51b and the principal point of the lens 52b when the tilting operation is performed is denoted by 53b '.
Then, the light beam 53 b ′ is reflected by the light beam 5 reflected by the subject 9.
It is necessary to arrange the lighting device 12b outside (behind) 3b ''. In the drawing, θ1 is the light flux 53 for the subject 9.
a ′ and the output angle of the light beam 53a ″, and θ2
Is the angle of incidence of the light beam 53b 'on the subject 9 and the light beam 5b.
3b ″.

As is apparent from FIG. 5, the position of the illumination device 12b when the tilt operation is performed is closer to the subject 9 than the position of the illumination device 12a when the tilt operation is not performed. Become. If the illumination device has the same light amount, the illumination device can be illuminated more brightly by disposing the illumination device near the subject 9. In FIG. 5, the CCD
If the tilting operation state indicated by 51b and the lens 52b is the minimum tilting state, the position of the lighting device is set to the position of the lighting device 12b, so that even if the tilting operation is increased, the reflected light by the lighting device 12b is increased. Is CCD51
b is prevented from being imaged.

-Shading Correction- The shading correction operation of the image input device will be described. FIG. 6A is a diagram illustrating shading characteristics of the lighting device 12. The shading characteristics of the subject 9
According to the distance between the illumination device 12 that illuminates the object and the subject 9,
This is caused by the difference in luminance on the subject 9. Curve 61
Is a curve representing shading characteristics on the subject 9.
The shading curve 61 indicates that the luminance on the back side of the subject 9 near the lighting device 12 is high, and the luminance on the front side of the subject 9 far from the lighting device 12 is low. In the rear end portion of the subject 9, since the amount of scattered light scattered on the subject 9 is small, a point where the brightness on the subject 9 is maximum is obtained at a position slightly inside (front side) from the rear end of the subject 9. .

In FIG. 6A, a light beam connecting both ends of the imaging range of the CCD 51 and the principal point of the zoom lens 2 is indicated by 53.
a, 53a ′, when the tilting operation is not performed,
That is, when the optical axis Cx of the CCD 51 and the optical axis Lx of the zoom lens 2 match, the front-back direction (X direction)
Is represented by 59b. FIG. 6B shows an imaging range 59b in the X direction in a state where the tilt is not performed;
It is a figure which shows the imaging range 59a when the imaging range of the X direction is moved back by the tilting operation, and the imaging range 59c when the imaging range of the X direction is moved forward. Note that the imaging range 59b is narrowed by operating the zoom (TELE side) switch 44b, and conversely widened by operating the zoom (WIDE side) switch 44a.

FIGS. 7A to 7C show the shading curves 61 extracted for each of the imaging ranges 59a to 59c.
(c) Shading curves 61a to 61c. In each of the curves 61a to 61c, the luminance of the subject 9 is the luminance M at the center of the imaging range 59a to 59c (FIG. 6B).
When the correction coefficients are determined so as to be constant at a to Mc, respectively, the correction coefficient curves 62a to 62 shown in FIGS.
c is obtained. The correction processing of the shading characteristics indicated by the curves 61a to 61c is performed by the signal processing circuit 32. For example, when the image is captured so that the imaging range in the X direction is 59b, the luminance of the rear of the subject 9 is high as indicated by the shading curve 61b. The closer to the back of the subject 9, the brighter the image is displayed. Therefore, in the signal processing circuit 32, the image of the subject 9 displayed on the monitor 100 is changed by changing the amplification gain of the amplification unit that amplifies the image data output from the CCD 31 based on the correction coefficient curve 62b. The same brightness is displayed before and after 9.

The correction coefficient curves 62a to 62c are obtained in advance on the basis of conditions such as the tilting operation state of the image input device and the imaging range according to the zoom operation of the zoom lens 2, and are provided in the system control circuit 42. And stored in a correction coefficient curve area allocated to the memory. The system control circuit 42 responds to the newly set conditions when the switch group 7 is operated and the imaging range is changed by the tilting operation and the zoom operation, and when the above-described setting condition file is read. The correction coefficient curve is read from the internal memory, and the shading characteristic is corrected based on the curve. The tilt operation state is detected by the operation amounts of the tilt adjustment motors 40 and 41 according to the operation amounts of the switches 45a, 45b, 46a and 46b, and the zoom operation is performed by the zoom lens driving motor 38 according to the operation amounts of the switches 44a and 44b. Is detected by the operation amount of.

-Brightness Correction- The shading characteristic correction processing described above corrects a difference in luminance on the subject 9 within the set imaging range. Therefore, the luminance in each of the imaging ranges 59a to 59c is the luminance M at the center of each of the imaging ranges 59a to 59c.
a, Mb, and Mc are corrected. As a result, when the imaging range is gradually moved by changing the tilting operation state, the luminance after the shading characteristic correction processing changes for each imaging range. For example, the luminance is displayed on the monitor 100 by performing the tilting operation. When a subject image is scrolled, the brightness of the subject image changes as the display screen scrolls. The brightness correction is performed to make the brightness of the subject image after the shading characteristic correction process constant regardless of the imaging range even when the shading characteristic correction process is performed for each imaging range.

Therefore, each of the imaging ranges 59a to 59a
The luminances Ma, Mb and Mc at the center of 9c (FIGS.
(c)) is obtained based on the tilting operation state of the image input device and the conditions such as the imaging range according to the zoom operation of the zoom lens 2, and stores it in the brightness correction coefficient area allocated to the memory in the system control circuit 42. Remember. Taking the case where the luminance after the shading characteristic correction processing in each imaging range is aligned with the luminance Mb at the center of the imaging range 59b as an example, when the imaging range is 59a, the brightness is corrected based on the difference between the luminances Ma and Mb. However, when the imaging range is 59c, the brightness is corrected based on the difference between the luminances Mc and Mb.

The brightness correction processing is performed by the signal processing circuit 32 in the same manner as the shading characteristic correction processing. That is, when the subject 9 is imaged in the imaging range 59a and the imaging range 59c, the amplification gain of the amplification unit that amplifies the image signal output from the CCD 31 is corrected by the correction coefficient (Ma−Mb) in the signal processing circuit 32; (Mc
−Mb), the monitor 1
The brightness of the subject image displayed at 00 is the imaging range 59b.
In this case, the brightness is the same as the brightness of the subject image.

In the above description, the brightness correction process is performed after the shading characteristic correction process. However, in the actual operation, the shading characteristic correction process and the brightness correction process are performed simultaneously. That is, when setting the amplification gain of the amplification unit that amplifies the image data in the signal processing circuit 32, the shading correction coefficient curve and the brightness correction coefficient of the shading correction coefficient curve and the brightness correction coefficient are read from the memory in the system control circuit 42 according to the tilt operation state and the zoom operation. Both are read.
Then, an amplification gain is determined based on the read shading correction coefficient curve and the brightness correction coefficient, and the image signal output from the CCD 31 is amplified by the determined amplification gain.

The features of this embodiment will be summarized. (1) In the image pickup head 1 of the image input apparatus, the optical axis of the CCD 31 is moved with respect to the optical axis of the lens 2 so as to have a tilt, and the image pickup head 1 is arranged at a rear position off the center of the document table 4. When the operator replaces the subject 9 placed on the document table 4 or changes the mounting position of the subject 9, the subject 9 is shaded by the imaging head 1 as viewed from the operator. It is difficult to work, and an effect that the work can be easily performed is obtained. (2) The illuminating device 12 can be disposed closer to the subject 9 because the imaging head 1 is tilted. Therefore, when the same illuminating device 12 is used, the subject 9 can be illuminated more brightly, the S / N ratio of the video signal is improved, and a high-quality subject image can be obtained. Further, since the lighting device 12 can be disposed near the subject 12, the size of the device can be reduced.

(3) Since the tilt amount can be adjusted, it is possible to move the imaging range 59a-c of the imaging head 1 by changing the tilt amount and scroll the subject image displayed on the monitor 100. It is now possible. Even if the imaging head 1 is fixed to the document table 4, the imaging range 59 a
To c can be moved, whereby the effect of improving the operability of the device can be obtained. (4) Since the shading characteristics are corrected,
The difference in luminance on the subject 9 within the set imaging range can be corrected. Therefore, the brightness of the subject image displayed on the monitor 100 becomes constant, and a high-quality subject image can be obtained.

(5) Since the brightness is corrected in accordance with the amount of tilt movement, the imaging range 59a to 59c is
The brightness of the subject image displayed on the monitor 100 can be kept constant regardless of which part is set above. As a result, even if the subject image is scrolled by adjusting the tilt amount, the brightness of the image is prevented from changing. (6) The imaging head 1 is mounted on the LCD 11 accommodated in the document table 4.
Since the markers 11a to 11d indicating the four corners of the imaging range are displayed, the changed imaging range can be displayed on the LCD 11 even when the imaging range is changed according to the tilting operation. Operability is improved. (7) When the tilt amount is adjusted, the operation amounts of the tilt adjustment motors 40 and 41 for driving the CCD 31 in the X and Y directions and the zoom lens driving motor 38 are detected, and the system control circuit 42 It can be stored in the setting condition file area of the provided memory. Therefore, by reading out the stored contents, the zoom operation, the tilt amount adjustment, the shading characteristic correction, and the brightness correction are automatically set, so that the operability of the apparatus is improved.

In the above description, the tilting operation is performed by moving the CCD 31 in a plane perpendicular to the optical axis of the zoom lens 2. However, the optical axis of the zoom lens 2 is set to X with respect to the optical axis of the CCD 31. The tilt operation may be performed by moving in the direction and the Y direction.

Further, in the above description, the four corners of the image pickup range picked up by the image pickup head 1 are displayed on the LCD 11 accommodated in the document table 4, but lines indicating the image pickup range are used instead of the four corners of the image pickup range. , And a marker indicating the center of the imaging range.

The correspondence between each component in the claims and each component in the embodiment of the invention will be described. The document table 4 is a mounting table, the zoom lens 2 is an imaging lens, and the CCD 31 is an imaging element. The imaging head 1 is provided in the imaging device, the tilt adjustment motors 40 and 41 are provided in the tilting means, the imaging ranges 59a to 59c are provided in the imaging region, and the marker 1 is provided.
1a to 11d correspond to marks, the LCD 11 corresponds to an imaging area display device, and the system control circuit 42 corresponds to storage means and control means.

[0040]

According to the present invention, as described in detail above, the following operational effects can be obtained. (1) According to the first aspect of the invention, the relative position of the imaging lens and the light receiving element is shifted to capture an image of a subject from an imaging device disposed above one end of the mounting table. For example, if the operator works on the mounting table from the opposite side of the imaging device when exchanging the subject on the mounting table, the operability of the device is improved because the imaging device is less likely to interfere with the operator. (2) According to the second aspect of the present invention, since the tilting means for shifting the relative positional relationship between the imaging lens and the light receiving element is provided, for example, even when the imaging apparatus cannot be moved with respect to the subject, Since the imaging area of the subject can be moved without changing the mounting position of the device, the operability of the apparatus is improved. (3) In the invention of claim 3, in addition to the configuration of claim 2,
Since the position of the illumination device is set so that the reflected light of the illumination device does not enter the light receiving element of the imaging device even when the tilt is minimum, for example, even if the subject is glossy, the influence of the reflected light is prevented. The effect is obtained. (4) In the invention of claim 4, in addition to the configuration of claim 3,
Since the shading correction in the imaging region is performed, for example, even when the brightness of the subject by the lighting device is different in the imaging region, the brightness of the captured subject is corrected to be constant, so that a high-quality image is obtained. A signal can be obtained. Furthermore, in the invention according to claim 5, the shading correction is performed so that the luminance for each set imaging region is constant. Therefore, even when the luminance of the subject by the illumination device differs for each imaging region, the shading correction is performed for each imaging region. Is corrected to be constant, and a high-quality image signal can be obtained. (5) According to the sixth aspect of the present invention, since the image pickup area of the image pickup apparatus is displayed with a mark, for example, even when the image pickup area is changed by the tilting means, the subject can be correctly placed in the image pickup area. become. (6) According to the seventh aspect of the present invention, since the mounting table is made expandable and contractible, the subject can be mounted even when the imaging area is likely to be out of the mounting table by the tilting means. (7) In the invention of claim 8, since the shift amount by the tilting means is stored and the tilting means is controlled based on the stored shift amount, for example, by storing a frequently used shift amount, It can be reproduced by one-button operation, and the operability of the device is improved.

[Brief description of the drawings]

FIG. 1A is a diagram illustrating an image input device according to an embodiment of the present invention, and FIG. 1B is a diagram illustrating a state in which the table is pulled out.

FIGS. 2A and 2B are diagrams illustrating a state where no tilt is performed, and FIG. 2B is a diagram illustrating a state where tilt is performed.

FIG. 3 is a diagram illustrating an LCD accommodated in a document table of the image input device.

FIG. 4 is a block diagram of the image input device of FIGS. 1 and 3;

FIG. 5 is a diagram illustrating a position of a lighting device.

FIG. 6A is a diagram illustrating a shading characteristic, and FIG. 6B is a diagram illustrating an imaging range.

7A is a diagram illustrating a shading characteristic curve and a correction coefficient of an imaging range 59a, FIG. 7B is a diagram illustrating a shading characteristic curve and a correction coefficient of the imaging range 59b, and FIG. 7C is a diagram illustrating a shading characteristic of the imaging range 59c. It is a figure showing a curve and a correction coefficient.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Imaging head, 2, 52a-b ... Zoom lens, 3 ...
Prop, 4 ... platen, 5 ... table, 6 ... handle, 7 ... switch group, 8 ... pointing device, 9 ... subject, 10 ...
Area, 11 ... LCD, 11a to 11d ... marker, 12,
12a, 12b ... lighting device, 31, 51, 51a-b ...
CCD, 32: signal processing circuit, 33: A / D conversion circuit,
34, a memory, 35, a D / A conversion circuit, 36, a synthesis circuit, 37, a camera system control circuit, 38, a zoom lens drive motor, 39, a focus adjustment motor, 40 to 41, a tilt adjustment motor, 42, a system control circuit , 43 ... LC
D switch, 44a-b ... zoom switch, 45a-
b: X-direction tilt switch, 46a-b: Y-direction tilt switch, 47-49: Setting condition file switch, 50: Hour meter, 61, 61a-c: Shading characteristic curve, 62a-c: Correction coefficient curve, 100 ... monitor

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B047 AA01 BA02 BB04 BC05 BC12 BC14 BC23 DA01 DA04 5C022 AC42 AC54 AC74 CA07 5C072 AA01 BA02 CA02 DA02 EA05 EA08 FB12 LA02 LA12 LA14 UA02 UA05 UA06

Claims (8)

[Claims] A mounting table on which a subject is mounted, and an optical image of the object mounted on the mounting table is formed on a light receiving element via an imaging lens, and an image signal corresponding to the formed optical image is provided. An imaging device that outputs the image, wherein the imaging device is disposed above one end of the mounting table, and the relative positional relationship between the imaging lens and the light receiving element so as to image at least the entire area of the mounting table. The image input device characterized by having shifted. 2. A mounting table on which an object is mounted, and an optical image of the object mounted on the mounting table is formed on a light receiving element via an imaging lens, and an image signal corresponding to the formed optical image. An image input device comprising: an image pickup device that outputs the image data; and a tilt unit that shifts a relative positional relationship between the image pickup lens and the light receiving element. 3. The image input device according to claim 2, further comprising: an illumination device for illuminating the subject, wherein when a shift amount of the relative positional relationship by the tilting unit is minimum, the illumination device is configured to be illuminated. An image input device, wherein the position of the illumination device is set so that reflected light from a subject does not enter the light receiving element. 4. The image input device according to claim 3, further comprising a correction unit that corrects shading in an imaging area set by the deviation of the relative positional relationship caused by the tilt unit. Image input device. 5. The image input device according to claim 4, wherein said correcting means performs shading such that the luminance for each of said imaging regions set by the deviation of said relative positional relationship by said tilting means becomes constant. An image input device, which corrects an image. 6. The image input device according to claim 2, further comprising: an image pickup area display device provided on the mounting table, for displaying a mark indicating an image pickup area of the image pickup apparatus. Image input device. 7. The image input device according to claim 2, wherein the mounting table is extendable. 8. The image input device according to claim 2, wherein said shift means stores a shift amount of said relative positional relationship by said tilt means, and said shift stored in said storage means. An image input device comprising: a control unit that controls a shift amount by the tilting unit based on the amount.