JP4052427B2 - High-speed high-precision digitization system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-speed and high-precision digitization system, and more particularly to a high-speed and high-precision digitization system that combines a CCD camera and an integrating sphere.
[0002]
[Prior art]
The need for high-precision digitizing devices is increasing as demands of the present and future times. In other words, not only in scientific research, but also in books, cultural assets, and daily life, digitization that replaces various objects with numerical data that can be stored, visualized, and scanned by a computer is an important means. come.
[0003]
[Problems to be solved by the invention]
In the digitization of images (data) as described above, there are some that require high accuracy. What is required at that time is the use of a light source capable of maintaining stable uniformity, and the use of an imaging device that enables high-speed digitization.
[0004]
In view of the above situation, the present invention irradiates an object to be imaged with a stable light source with uniform illuminance and does not change with time, and combines a CCD camera capable of high-speed imaging and an integrating sphere with high speed and high accuracy. It aims to provide a digitization system.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides
[1] In a high-speed and high-precision digitization system, an integrating sphere (2) for obtaining a stable light source with uniform illuminance and which does not vary with time, and a material placed near the opening of the integrating sphere (2) A table (3) , a transmission type material (6) set on the material table (3) in an exchangeable manner, a CCD camera (7) for imaging the material (6) , and the material table ( 3) A screw rod penetrating the pedestal (1) on which the integrating sphere is supported, the pedestal (1) on which the integrating sphere is supported, and a document capable of adjusting the distance from the opening of the integrating sphere (2). It is characterized by comprising a set distance adjusting mechanism including a nut for maintaining an adjusted distance from the support portion (9) of the mounting table (3) .
[0006]
[ 2 ] The high-speed and high-precision digitizing system according to [1], further comprising a slide mechanism that allows the mounting table to slide.
[0007]
[ 3 ] The high-speed and high-precision digitization system according to [1], wherein the CCD camera is a two-dimensional CCD camera.
[0008]
The present invention is a system that uses an integrating sphere as the stable light source and a two-dimensional CCD as a high-speed imaging device and combines them. Data that can directly use the integrating sphere is transmission data. In that case, the data can be applied to a wide variety of applications, including photographic plates, photographic films, especially movie films, medical photographic films, and records of documents already transferred to microfilms.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0010]
FIG. 1 is a schematic diagram of a high-speed and high-precision digitizing system combining a CCD camera and an integrating sphere showing an embodiment of the present invention, and FIG. 2 is a CCD camera showing an embodiment of the present invention and a mounting table for transmission image data. It is a figure which shows mutual relationship.
[0011]
In these figures, reference numeral 1 denotes a pedestal, and 2 denotes a stable light source (a light source in a white-painted sphere that diffusely reflects the inner surface) that is supported by the pedestal 1 and has uniform illumination and does not vary with time. Integrating sphere, 2A is an opening of integrating sphere 2, 3 is a material (imaging target) mounting table, 3A is a rail (screw rod), 4 is a set distance adjusting mechanism of the material mounting table 3, and 5 is a material mounting table. 3 is a sliding mechanism (mechanism that meshes with the screw rod 3A), 6 is a transmission-type digitized imaging object set on the material mounting table 3, and 7 is a two-dimensional fixed to the upper part of the gantry 1 A CCD camera, 8 is an electric motor, 9 is a support unit for the document mounting table 3, 10 is a computer for processing information from the two-dimensional CCD camera 7, 11 is a power source, and 12 is a control unit for the power source 11. Computation information of camera 7 Receiving from the data 10, and controls the power supply 11 in synchronization with the imaging operation of the 2-dimensional CCD camera 7, and controls the electric motor 8.
[0012]
The two-dimensional CCD camera 7 is provided with a document imaging mechanism having a power source and its control unit, and the operation of the imaging mechanism is commanded by the computer 10. In this case, the power source and its control unit may be arranged outside the two-dimensional CCD camera 7.
[0013]
Further, in the above embodiment, the power supply 11 and the control unit 12 of the electric motor 8 are provided outside the electric motor 8, but can be incorporated in the electric motor 8. In that case, it is only necessary to insert the imaging operation of the two-dimensional CCD camera 7 from the computer 10 into the control unit 12.
[0014]
The digitization system in this example is designed for the special purpose of digitizing photographic plate and film data, which is a transmissive digitized material measuring 25 cm × 25 cm. .
[0015]
The present invention is not limited to this design, but covers the entire system using a two-dimensional CCD camera and an integrating sphere as a light source. If the shape of the data to be digitized is small, the size of the integrating sphere and the entire system will be small. For example, in the case of a 35 mm film, the integrating sphere 2 becomes smaller. The CCD camera 7 incorporates a circuit capable of high-speed shooting.
[0016]
In addition, the positional relationship between the integrating sphere and the CCD camera is not limited to the vertical direction, and the horizontal arrangement may be efficient.
[0017]
The central sphere shown in FIG. 1 is an integrating sphere 2 and is spherical in order to achieve uniform illuminance at the upper opening 2A. In this embodiment, when two arbitrary points are selected, the illuminance is designed to be uniform with an accuracy of 1/10000. The integrating sphere 2 is used and combined with the two-dimensional CCD camera 7.
[0018]
In FIG. 2, a transmission type digitized material 6 is placed translucently. A circle drawn with a dotted line below it is the opening 2A of the integrating sphere 2. Since the intensity of the light source is uniform at the opening 2A, it is desirable that the material 6 be as close to the opening 2A of the integrating sphere 2 as possible.
[0019]
Therefore, the supporting part 9 of the material mounting table is assembled to a part of the gantry 1 by the set distance adjusting mechanism 4 so that the distance from the opening 2A of the integrating sphere 2 can be adjusted.
[0020]
The material placing table 3 is placed on a rail (screw rod) 3A so as to be slidable by driving an electric motor 8, so that a photographic plate is replaced in a short time and a large amount of material is digitized. . That is, the electric motor 8 is controlled by the computer 10 and the control unit 12 of the power source 11 in synchronization with the imaging operation of the two-dimensional CCD camera 7, and the material mounting table 3 slides automatically every time the two-dimensional CCD camera 7 performs imaging. The position of the material 6 is automatically changed so that an image can be taken.
[0021]
Further, during the digitization work, the opening 2A of the integrating sphere 2 is brought as close to the material placing table 3 as possible.
[0022]
In actual application, the system design is changed depending on the object.
[0023]
According to this invention, since it comprised as mentioned above, there exist the following effects.
[0024]
(1) Accurate digitization of color and shade The digitization system of the present invention can accurately digitize the color and shade of an image. In order to faithfully reproduce the color and shade of the object to be digitized, the uniformity of the light source that illuminates the object needs to be constant. Even if the light source is not uniform, the object can be removed and digital data (numerical data) of only the light source can be obtained, and if the light source does not change during this time, the non-uniformity of the light source is a method called the flat field method Can be corrected. The object to be digitized is removed, divided by the numerical data of the light source only, and the data is normalized.
[0025]
Even in a dark light source, if the intensity of the light source does not change, normalization results in the same data as obtained with a uniform light source of the same intensity. However, if the uniformity of the light source changes with time, this normalization becomes meaningless.
[0026]
In the system of the present invention, the integrating sphere is combined as a light source because it is important to have high uniformity, but this uniformity is maintained with high accuracy. This is in contrast to the time variation of the light source used in many scanners.
[0027]
By using such a light source with uniform light source uniformity and a CCD camera that can be expressed with high accuracy, that is, with as many numerical values as possible. Can be quantified.
[0028]
(2) High speed High speed is important when digitizing materials such as documents. Therefore, as in many scanners, a CCD arranged on a two-dimensional grid is used instead of a one-dimensional CCD. For this reason, many materials can be quantified in a short time without requiring scanning time. At this time, the image of the material is formed on the CCD by an imaging system such as a lens.
[0029]
(3) Since the position of the document can be automatically changed by automatically sliding the document mounting table in synchronization with the imaging operation of the document such as the document, the imaging of the document is automatically performed. And continuously. In other words, even a large amount of information can be captured efficiently.
[0030]
In addition, this invention is not limited to the said Example, A various deformation | transformation is possible based on the meaning of this invention, and these are not excluded from the scope of the present invention.
[0031]
【The invention's effect】
As described above in detail, according to the present invention, the following effects can be obtained.
[0032]
(A) Accurate color and shading by illuminating data as an imaging target with an integrating sphere, which is a stable light source with uniform illuminance and does not change with time, and a CCD camera capable of high-speed imaging Can be numerically converted.
[0033]
(B) Using CCDs arranged on a two-dimensional grid, high-speed and high-precision digitized information processing can be performed.
[0034]
(C) Automatic and continuous efficient imaging can be performed by sliding a material (imaging target) synchronized with the imaging operation of the two-dimensional CCD camera.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a high-speed and high-precision digitizing system that combines a CCD camera and an integrating sphere according to an embodiment of the present invention.
FIG. 2 is a diagram showing the interrelationship between a CCD camera according to an embodiment of the present invention and a mounting table for transmission-type image data.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stand 2 Integrating sphere 2A Integral sphere opening 3 Document (imaging object) mounting table 3A Rail (screw rod)
4 Set-up distance adjustment mechanism of the document mounting table 5 Slide mechanism of the document mounting table 6 Data to be digitized through transmission (object to be imaged)
7 Two-dimensional CCD camera 8 Electric motor 9 Supporting part of data mounting table 10 Computer 11 Power supply 12 Control part

Claims (3)

(A) an integrating sphere (2) for obtaining a stable light source having uniform illumination and not fluctuating over time;
(B) a material mounting table (3) disposed in the vicinity of the opening of the integrating sphere (2) ;
(C) said document stand (3) interchangeably set the transmissive article on the (6),
And (d) CCD camera for imaging the article (6) (7),
(E) The material mounting table (3) is adjustable by a distance from the opening of the integrating sphere (2) , the screw rod passing through the mount (1) on which the integrating sphere is supported, and the integrating sphere supported High-speed and high-precision digital comprising a set distance adjusting mechanism having a nut for maintaining an adjusted distance between the pedestal (1) to be supported and the support (9) of the material mounting table (3) System.   2. The high-speed and high-precision digitizing system according to claim 1, further comprising a slide mechanism that allows the mounting table to slide.   2. The high-speed and high-precision digitizing system according to claim 1, wherein the CCD camera is a two-dimensional CCD camera.

Images