KR100632747B1 - Image input apparatus, camera and contact image sensor - Google Patents

Abstract

An image input apparatus, a camera and a contact image sensor are provided to input an image from which a hologram is removed to a light-receiving unit from an object on which the hologram is printed using a polarization filter. An image receiving apparatus includes a light source emitting light to an object on which a hologram is printed, a first polarization filter, a second polarization filter, and a light-receiving unit. The first polarization filter is located on the traveling path of the light emitted from the light source to the object and has a first polarization axis. The second polarization filter is located on the traveling path of light that passes through the first polarization filter, inputs to the object and then reflected from the object and has a second polarization axis. The light-receiving unit receives the light that passes through the second polarization filter. The first polarization axis and the second polarization axis are arranged at a predetermined angle to each other when the first polarization filter and the second polarization filter are opposite to each other in parallel so that an image from which the hologram printed on the object is removed is inputted to the light-receiving unit.

Description

Image input, camera and contact image sensors {IMAGE INPUT APPARATUS, CAMERA AND CONTACT IMAGE SENSOR}

1 is a schematic block diagram of an image input apparatus according to the present invention;

2A and 2B are views in which the first polarizing filter and the second polarizing filter, which are components of the image input device of FIG. 1, face each other in parallel;

3 is a perspective view of a camera according to an embodiment of the present invention;

4 is a perspective view of a camera according to another embodiment of the present invention;

5A, 5B, 5C, 5D, 5E, and 5F are photographs of a social security card on which a hologram is printed on a surface using a camera according to the present invention, wherein angles between the first and second polarization axes are 0 ° and 45 °, respectively. , Photos at 60 °, 67 °, 80 ° and 90 °,

6 is a schematic perspective view of a contact image sensor according to an embodiment of the present invention;

7 is a cross-sectional view of the contact image sensor of FIG. 6 viewed from the A-A direction;

8 is a cross-sectional view of a contact image sensor according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: light source 20: first polarization filter

22: first polarization axis 30: second polarization filter

32: second polarization axis 40: light receiving portion

42: lens system 44: photoelectric conversion element

46: drive circuit 48: PCB board

100: camera 110: home

120: case 130: reflector

200: contact image sensor 210: transmissive member

The present invention relates to an image input device, and more particularly, an image in which the pattern of the hologram is removed from a subject such as a resident registration card or a driver's license on which a hologram is printed on a surface by using a polarization filter may be input to a light receiving unit. It relates to a camera, a contact image sensor and other image input devices.

In general, an image input device is a moving image camera such as a TV camera, a camcorder, an unmanned surveillance camera, a digital still camera (DSC), a black and white / color scanner (black and white / color). It refers to a system such as a scanner, a business card scanner, a digital copier, a facsimile, a multi-function peripheral (MFP), and the like.

In particular, a scanner that reads business cards, images of subjects such as documents and books, may be manufactured as a single piece for scanning purposes, or may be composed of a multifunction device together with a copy machine and a fax machine.

In general, a scanner projects a light from a light source onto a subject and reflects it, and uses a contact image sensor (CIS) using a photoelectric conversion element such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) It converts into electric output value through.

A method of inputting an image of a subject using a contact image sensor is as follows.

First, when light is emitted from a light source to a focus set on a glass substrate, light reflected from a subject on the glass substrate is directed to the inside of the unit through a rod lens. Then, the light reaches a photoelectric conversion element (sensor chip), the optical signal in the photoelectric conversion element and the circuit board (PCB) is converted into an electrical signal of the analog form, the electrical signal is output through a connector (Connector) .

However, if you use a scanner equipped with a contact image sensor to scan a subject such as a social security card or a driver's license that has a hologram printed on the surface, the pattern of the hologram will be included in addition to the image of the subject itself. Problems with input occur.

The hologram on the ID card such as the resident registration card or the driver's license is printed for security reasons to prevent forgery and alteration, but the user wants to acquire only the unique information of the actual subject, that is, the image except the pattern of the hologram, for image processing. many. In this case, the pattern of the hologram acts as a kind of noise to interfere with image processing.

The above problem is the same even when the subject whose hologram is printed on the surface is photographed using a camera or an image input apparatus.

The present invention is to solve the above-mentioned problems, a camera that can be input to the light receiving unit the image of the hologram is removed from the subject, such as a national ID card or driver's license is printed on the surface using a polarizing filter, It is an object of the present invention to provide a contact image sensor or other image input apparatus.

Image input device according to an aspect of the present invention for achieving the above object,

A light source unit emitting light toward a subject on which a hologram is printed on a surface;

A first polarization filter disposed on a traveling path of light from the light source toward the subject and having a first polarization axis;

A second polarization filter passing through the first polarization filter and disposed on a traveling path of light that is incident on the subject and reflected from the subject and has a second polarization axis; And

And a light receiving unit receiving light passing through the second polarization filter.

When the first polarization filter and the second polarization filter face each other in parallel to each other, the first polarization axis and the second polarization axis are formed at a predetermined angle to each other, so that the image of the hologram printed on the object is removed. Is input to the light receiving unit.

In addition, the camera according to another aspect of the present invention for achieving the above object,

A light source unit emitting light toward a subject on which a hologram is printed on a surface;

A first polarization filter disposed to cover the light irradiation portion of the light source unit and having a first polarization axis;

A light receiving unit which receives the light reflected from the subject after passing through the first polarization filter and entering the subject; And

And a second polarization filter disposed to cover a portion for receiving the reflected light in the light receiving unit and having a second polarization axis.

When the first polarization filter and the second polarization filter face each other in parallel to each other, the first polarization axis and the second polarization axis are formed at a predetermined angle to each other so that an image of a state in which the pattern of the hologram printed on the subject is removed is It is characterized in that the input to the light receiving unit.

In addition, the contact image sensor according to another aspect of the present invention for achieving the above object,

A light source unit emitting light toward a subject on which a hologram is printed on a surface;

A polarization filter disposed to cover the light irradiation portion of the light source unit and having a first polarization axis;

A linear light receiver which receives the light reflected from the subject after passing through the first polarization filter and entering the subject; And

And a second polarization filter disposed to cover a portion for receiving the reflected light in the light receiving unit and having a second polarization axis.

When the first polarization filter and the second polarization filter face each other in parallel to each other, the first polarization axis and the second polarization axis are formed at a predetermined angle to each other so that an image of a state in which the pattern of the hologram printed on the subject is removed is It is characterized in that the input to the light receiving unit.

In this case, the above-described image input apparatus, camera and contact image sensor,

When the first polarization filter is moved as it is along the path of light to face the second polarization filter in parallel with each other, the angle between the first polarization axis and the second polarization axis is preferably 67 ° or more and 90 ° or less.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of an image input apparatus according to the present invention.

2A and 2B are diagrams in which the first polarization filter and the second polarization filter, which are components of the image input device of FIG. 1, face each other in parallel, and the angles formed between the first and second polarization axes are 90 ° and 67, respectively. It shows the state which is °.

Referring to the drawings, the image input apparatus includes a light source unit for irradiating light toward a subject whose hologram is printed on a surface thereof; A first polarization filter disposed on a traveling path of light from the light source toward the subject and having a first polarization axis; A second polarization filter passing through the first polarization filter and disposed on a traveling path of light that is incident on the subject and reflected from the subject and has a second polarization axis; And a light receiving unit receiving light passing through the second polarization filter.

Here, the object has a hologram printed on its surface, for example, it may be a resident registration card or a driver's license on which a security hologram is printed to prevent forgery and forgery.

The light source unit irradiates light toward the subject, and a halogen lamp, a fluorescent lamp, or a light emitting diode (LED) may be used.

The first polarization filter and the second polarization filter respectively pass only a first polarization axis component and a second polarization axis component among the light irradiated from the light source and the light reflected from the subject, and pass the first polarization filter to the light. The image of the hologram printed on the subject is removed by arranging the first polarization axis and the second polarization axis to have a predetermined angle when they are moved along the traveling path to face each other in parallel with the second polarization filter. May be input to the light receiving unit. The angle can be adjusted by rotating the first polarizing filter or the second polarizing filter.

As the angle formed by the two axes is closer to 90 °, the pattern of the hologram input to the light receiving unit is gradually reduced or eliminated. Preferably, the angle formed by the first polarization axis and the second polarization axis is 67 ° or more and 90 ° or less.

In this case, the first polarizing filter and the second polarizing filter may be a PL filter, a CPL filter, or a polarizing film. The removal rate of the hologram pattern depends on the angle formed by the two polarization axes of the two polarization filters rather than the type of the polarization filter.

The light receiving unit may receive a light of the second polarization axis component only by the second polarization filter, and a photoelectric conversion element such as a CCD or a CMOS may be used as a portion to which the image of the subject is input.

The image input device may further include a case including all of the light source unit, the first polarization filter, the second polarization filter, and the light receiving unit, and blocking the inflow of other external light sources in addition to the light of the light source unit. have.

The case serves as a dark room to remove elements that can reproduce the pattern of the hologram in addition to the light of the light source unit 10 of the present invention.

In this case, the subject may be inserted into the case.

3 is a perspective view of a camera according to an embodiment of the present invention.

Referring to the drawings, the camera 100 includes a light source unit 10 for irradiating light toward a subject whose hologram is printed on a surface thereof; A first polarization filter 20 disposed to cover the light irradiation portion of the light source unit 10 and having a first polarization axis; A light receiving unit 40 passing through the first polarization filter 20 and receiving light reflected from the subject after being incident to the subject; And a second polarization filter 30 disposed to cover a portion of the light receiving unit 40 that receives the reflected light, and having a second polarization axis.

At this time, the first polarization filter 20 and the second polarization filter 30 should not be disposed continuously on the path of light. When the first polarization filter 20 and the second polarization filter 30 overlap each other, the closer the angle between the first polarization axis and the second polarization axis to 90 °, the more the light passing through the two filters is further blocked. This is because it does not help to remove the pattern of the hologram that is the purpose.

Here, the object has a hologram printed on its surface, for example, it may be a resident registration card or a driver's license on which a security hologram is printed to prevent forgery and forgery.

The light source unit 10 is a portion for irradiating light toward the subject, a halogen lamp, a fluorescent lamp or a light emitting diode (LED) may be used.

The first polarization filter 20 and the second polarization filter 30 respectively pass only the first polarization axis component and the second polarization axis component among the light irradiated from the light source unit 10 and the light reflected from the subject. When the first polarization filter 20 is moved along the path of light as it is to face the second polarization filter 30 in parallel with each other, the first polarization axis and the second polarization axis are arranged to have a predetermined angle to each other. An image in which a pattern of the hologram printed on the subject is removed may be input to the light receiving unit. The angle is adjustable by rotating the first polarization filter 20 or the second polarization filter 30.

As the angle formed by the two axes is closer to 90 °, the pattern of the hologram input to the light receiving unit 40 is gradually reduced or eliminated. Preferably, the angle formed by the first polarization axis and the second polarization axis is 67 ° or more and 90 ° or less. Do.

In this case, the first polarizing filter and the second polarizing filter may be a PL filter, a CPL filter, or a polarizing film. The removal rate of the hologram pattern depends on the angle formed by the two polarization axes of the two polarization filters rather than the type of the polarization filter.

On the other hand, the light receiving unit 40 is a portion where the image of the subject is input by receiving only the light of the second polarization axis component of the reflected light by the second polarization filter 30. The light receiving portion includes a lens portion, a photoelectric conversion element, a circuit board, and a connector.

The lens unit receives and collects light passing through the second polarization filter. A photoelectric conversion element inputs an image of a subject using light received from the lens unit, and such a photoelectric conversion element may be a CCD or a CMOS. In addition, a circuit board is electrically connected to the photoelectric conversion element, and a connector is electrically connected to the circuit board to transfer an image of the subject input to the photoelectric conversion element to other electronic devices.

Accordingly, the image inputted through the second polarization filter 30 to the lens unit of the light receiving unit 40 is an image in which the hologram pattern is reduced or removed, and only the image of the subject in which the hologram pattern is removed is photoelectric conversion. Since it is transmitted to other electronic devices, it is possible to perform a desired task after the noise is removed.

Meanwhile, the camera 100 includes all of the light source unit 10, the first polarization filter 20, the second polarization filter 30, and the light receiving unit 40, and the light of the light source unit 10. In addition, it may further include a case 120 for blocking the light inflow of other external light sources.

The case serves as a dark room to remove elements that can reproduce the pattern of the hologram in addition to the light of the light source unit 10 of the present invention.

In this case, as shown in FIG. 3, a groove 110 into which the subject can be inserted may be formed in the case 120.

4 is a perspective view of a camera according to another embodiment of the present invention, showing that the light receiving portion of the camera is recessed relative to the light source unit.

Referring to the drawings, the light source unit 10, the first polarization filter 20, the subject, the second polarization filter 30, and the light receiving unit 40 are in the path of light traveling in the order of the light source unit 10 and the subject. The light path length between the light paths 40 and the subject is smaller than the light path length. In other words, the light receiving unit 40 is recessed relative to the light source unit 10, and the light source unit 10 is formed along the periphery at the height of forming the end with the light receiving unit 40.

At this time, the first polarization filter 20 and the second polarization filter 30 should not be disposed continuously on the path of light. When the first polarization filter 20 and the second polarization filter 30 overlap each other, the closer the angle between the first polarization axis and the second polarization axis to 90 °, the more the light passing through the two filters is further blocked. This is because it does not help to remove the pattern of the hologram that is the purpose.

The camera 100 further includes a case 120 serving as a dark room, and removes elements capable of reproducing the pattern of the hologram in addition to the light of the light source unit 10 of the present invention.

In this case, as shown in FIG. 4, a groove 110 into which the subject can be inserted may be formed in the case 120. In FIG. 4, the groove 110 is formed to be parallel to the bottom surface in consideration of the presence of the reflector 130 reflecting the subject. However, as shown in FIG. 3, the groove 110 may be perpendicular to the bottom surface. Of course.

4, the reflector 130 may be further disposed on a path of the light between the first polarization filter 20 and the subject, and the reflector 130 may include the first polarization light. The light incident through the filter 20 to the reflector 130 may be reflected to the subject, and the light reflected from the subject may be reflected back toward the light receiving unit 40. As a reflector, a total reflection mirror may be used.

Even in this case, when the first polarization filter 20 is moved as it is along the traveling path of light to face the second polarization filter 30 in parallel with each other, the first polarization axis and the second polarization axis have a predetermined angle. By arranging such that the image of the hologram printed on the subject is removed, the image may be input to the light receiving unit. The angle is adjustable by rotating the first polarization filter 20 or the second polarization filter 30.

As the angle formed by the two axes is closer to 90 °, the pattern of the hologram input to the light receiving unit 40 is gradually reduced or eliminated. Preferably, the angle formed by the first polarization axis and the second polarization axis is 67 ° or more and 90 ° or less. Do.

Accordingly, an image in which the pattern of the hologram printed on the subject is removed is input to the light receiving unit 40, and the operation of the light receiving unit is as described above.

5A, 5B, 5C, 5D, 5E, and 5F are photographs of a social security card on which a hologram is printed on a surface using a camera according to the present invention, wherein angles between a first polarization axis and a second polarization axis are 0 ° and 45 °, respectively. The photograph at the time of °, 60 degrees, 67 degrees, 80 degrees, and 90 degrees is shown.

In the photograph, the portion of the semi-circular shining around the letter indicating the address, and the portion extending from the lower left to the right of the ID card, and the portion of the shining in the form of a continuous millet pattern are the patterns of the hologram to be removed in the present invention.

Referring to the photographs, as the angle between the first polarization axis and the second polarization axis approaches 90 °, the pattern of the hologram input to the light receiving unit is gradually reduced or eliminated, and the angle between the first polarization axis and the second polarization axis is 67 ° or more. At this time, it can be seen that the pattern of the hologram printed on the surface of the ID card is clearly reduced.

Table 1 shows the removal rate of the hologram pattern according to the angle formed by the first polarization axis and the second polarization axis.

<Table 1> Removal rate of hologram pattern according to angle between two polarization axes

Angle formed between the first and second polarization axes Removal rate of hologram pattern 0 ° 0 % 45 ° 3% 60 ° 15% 67 ° 92% 80 ° 97% 90 ° 99.5%

The photographs show only part of the resident registration card for the protection of the individual, but the rest shows similar results to the above data. .

FIG. 6 is a schematic perspective view of a contact image sensor according to an embodiment of the present invention, and FIG. 7 is a cross-sectional view of the contact image sensor of FIG. 6 viewed in the A-A direction.

Referring to the drawings, the contact image sensor 200 includes a light source unit 10 for irradiating light toward a subject whose hologram is printed on a surface thereof; A first polarization filter 20 disposed to cover the light irradiation portion of the light source unit 10 and having a first polarization axis; A linear light receiving part 40 passing through the first polarization filter 20 and receiving light reflected from the subject after being incident to the subject; And a second polarization filter 30 disposed to cover a portion of the light receiving unit 40 that receives the reflected light, and having a second polarization axis.

In this case, the light source unit 10 may be formed linearly in parallel with the linear light receiving unit 40.

In addition, the contact image sensor may be further provided with a transparent and transmissive member capable of transmitting light on a path of light that travels between the light source unit 10 and the subject and between the subject and the light receiving unit 40.

In this case, the first polarizing filter and the second polarizing filter may be a PL filter, a CPL filter, or a polarizing film. The removal rate of the hologram pattern depends on the angle formed by the two polarization axes of the two polarization filters rather than the type of the polarization filter.

Contact Image Sensors (CIS) are widely used in office equipment such as image input devices such as fax machines, scanners, business card scanners, etc., and CIS, which is commonly used, is transparent to light and transparent to protect its surface. The upper surface of the CIS is covered by a member, for example, a glass plate, so that the image of the subject can be scanned without distortion even if the object is brought into close contact with the glass plate.

As shown in FIG. 6 and FIG. 7, the CIS is a modular component assembled into several components.

Referring to the drawings, the operation principle of the CIS 200 according to an embodiment of the present invention will be described. A subject to be read on the upper surface of the transmissive member 210 using a roller (not shown) of an image input apparatus such as a scanner. Is introduced. The subject has a hologram printed on its surface, for example, a social security card or a driver's license with a security hologram printed on it to prevent forgery and alteration.

Then, light emitted by the light source unit 10 toward the subject is irradiated. The light source unit 10 may be linear as shown, and typically uses a small light emitting diode (LED) as a light source. The black-and-white CIS is a single white light, and the color CIS alternately irradiates red, green, and blue LEDs, reads the amount of light for each LED, and inputs the color of the subject by the combination of these three values. These LEDs, as well as the light source of the lamps, as well as the amount of light is significantly less than the external light, it is important to mechanically prevent the CIS from being exposed to the external light.

Then, only the first polarization axis component of the light irradiated from the light source unit 10 is passed by the first polarization filter 20 having the first polarization axis. At this time, the filter 20 should be disposed to cover the light irradiation portion of the light source 10 toward the subject.

The irradiated light is then reflected on the subject. The intensity of light changes as there is data in the part of the subject where light is irradiated.

Then, only the second polarization axis component of the reflected light is passed by the second polarization filter 30 having the second polarization axis. The filter 30 should be disposed to cover the light receiving portion of the light receiving portion 40.

In this case, when the first polarization filter 20 is moved along the path of light as it is to face the second polarization filter 30 in parallel with each other so that the first polarization axis and the second polarization axis have a predetermined angle to each other. By arranging, the image of the state in which the pattern of the hologram printed on the subject is removed may be input to the light receiving unit. The angle is adjustable by rotating the first polarization filter 20 or the second polarization filter 30.

As the angle formed by the two axes is closer to 90 °, the pattern of the hologram input to the light receiving unit 40 is gradually reduced or eliminated. Preferably, the angle formed by the first polarization axis and the second polarization axis is 67 ° or more and 90 ° or less. Do.

Accordingly, the light receiving unit 40 receives an image in which the pattern of the hologram printed on the subject is removed. The light receiving unit 40 includes a lens system 42, a photoelectric conversion element 44, a driving circuit 46, and a PCB substrate 48. The light passing through the second polarization filter 30 is focused by the lens system 42 arranged linearly. The light focused by the lens system 42 is input to a sensor cell of a photoelectric conversion element 44 (an integrated circuit composed of phototransistors) such as a CCD or a CMOS attached to the PCB substrate 48.

The photoelectric conversion element 44 is operated by the driving circuit 46 formed on the PCB substrate 48 at the same time that light having the subject data is input to the sensor cell. Each photoelectric conversion element 44 is connected to various types of bonding pad portions (not shown) and gold wires (not shown) on the PCB substrate 48 to transmit electrical signals generated from the sensor cells. . Accordingly, the optical data input to the sensor cell is photoelectrically converted and output. The output signal is amplified to a voltage suitable for operating the system by an amplifying circuit in the driving circuit.

In addition, a light source guide 15 surrounding the light source unit 10 may be further provided, which focuses the light emitted from the light source unit 10 to increase optical characteristics. As shown in FIG. 7, the first polarization filter 20 may be mounted on the light source guide 15 or may be mounted on the light irradiation part of the light source unit 10. In addition, the second polarization filter 30 may be mounted on an upper surface of the lens system 42 of the light receiving unit.

On the other hand, a dummy plate 49 may be further provided on the lower surface of the PCB substrate 48, which prevents damage to the PCB substrate back pattern due to external shock applied to the device and prevents damage due to static electricity. Ground means for doing so.

8 is a cross-sectional view of a contact image sensor according to another embodiment of the present invention.

Referring to the drawings, the first polarization filter 20 may be installed at a portion of the bottom surface of the transmitting member 210 through which light irradiated from the light source 10 toward the subject passes. In addition, the second polarization filter 30 may be installed at a portion of the bottom surface of the transmissive member 210 through which light reflected from the subject toward the light receiver 40 is transmitted.

When the first polarization filter 20 and the second polarization filter 30 are installed on the bottom surface of the transmission member 210, it is easy to adjust the angle between the first polarization axis and the second polarization axis, and the filter 20 , 30) can be easily attached to the bottom surface of the transmission member (210). In this case, the first and second polarization filters 20 and 30 should respectively cover the light irradiation portion of the light source unit 10 and the entire light receiving portion of the light receiving unit 40, and should be disposed so that the two filters do not overlap.

In this case, the first polarization axis and the second polarization axis may be disposed at a predetermined angle to each other so that an image of a state in which the pattern of the hologram printed on the subject is removed may be input to the light receiving unit.

As the angle formed by the two axes is closer to 90 °, the pattern of the hologram input to the light receiving unit 40 is gradually reduced or eliminated. Preferably, the angle formed by the first polarization axis and the second polarization axis is 67 ° or more and 90 ° or less. Do.

Even if the image between the first polarization axis and the second polarization axis is input using the CIS according to the present invention, even if an image such as a social security card printed on the surface of the hologram is input, similar results to the experimental data inputted using the camera can be obtained. Of course it can.

Camera, contact image sensor and other image input apparatus according to the present invention so that the image of the hologram is removed from the subject, such as a resident registration card or driver's license that the hologram is printed on the surface using a polarization filter so that the image can be input to the light receiving unit Thus, the pattern of the hologram, which acts as a kind of noise and interferes with image processing, can be reduced or eliminated.

Although the present invention has been described with reference to the illustrated embodiments, it is merely exemplary, and the present invention may encompass various modifications and equivalent other embodiments that can be made by those skilled in the art. Will understand.

Claims (22)

A light source unit emitting light toward a subject on which a hologram is printed on a surface; A first polarization filter disposed on a traveling path of light from the light source toward the subject and having a first polarization axis; A second polarization filter passing through the first polarization filter and disposed on a traveling path of light that is incident on the subject and reflected from the subject and has a second polarization axis; And And a light receiving unit receiving light passing through the second polarization filter. When the first polarization filter and the second polarization filter face each other in parallel to each other, the first polarization axis and the second polarization axis are formed at a predetermined angle to each other, so that the image of the hologram printed on the object is removed. Is input to the light receiving unit. The method of claim 1, And a case including all of the light source unit, the first polarization filter, the second polarization filter, and the light receiving unit, and blocking the inflow of other external light sources in addition to the light of the light source unit. The method of claim 1, And the first polarization filter and the second polarization filter are PL filters, CPL filters, or polarizing films. The method according to any one of claims 1 to 3, And an angle formed by the first polarization axis and the second polarization axis is 67 ° or more and 90 ° or less. A light source unit emitting light toward a subject on which a hologram is printed on a surface; A first polarization filter disposed to cover the light irradiation portion of the light source unit and having a first polarization axis; A light receiving unit which receives the light reflected from the subject after passing through the first polarization filter and entering the subject; And And a second polarization filter disposed to cover a portion for receiving the reflected light in the light receiving unit and having a second polarization axis. When the first polarization filter and the second polarization filter face each other in parallel to each other, the first polarization axis and the second polarization axis are formed at a predetermined angle to each other so that an image of a state in which the pattern of the hologram printed on the subject is removed is And a camera input to the light receiving unit. The method of claim 5, And a case including all of the light source unit, the first polarization filter, the second polarization filter, and the light receiving unit, and blocking the inflow of other external light sources in addition to the light of the light source unit. The method of claim 6, The case further comprises a groove into which the subject can be inserted. The method of claim 6, A reflector is further disposed on a traveling path of light between the first polarization filter and the subject, wherein the reflector is And a light incident to the reflector through the first polarization filter and reflected to the subject, and reflects light reflected from the subject back toward the light receiving unit. The method of claim 5, The first polarizing filter and the second polarizing filter is a camera, characterized in that the PL filter, CPL filter or polarizing film. The method of claim 5, And the light receiving portion is recessed relative to the light source portion, and the light source portion is formed along the periphery at a height of forming the end with the light receiving portion. The method according to any one of claims 5 to 10, And an angle formed by the first polarization axis and the second polarization axis is 67 ° or more and 90 ° or less. A light source unit emitting light toward a subject on which a hologram is printed on a surface; A polarization filter disposed to cover the light irradiation portion of the light source unit and having a first polarization axis; A linear light receiver which receives the light reflected from the subject after passing through the first polarization filter and entering the subject; And And a second polarization filter disposed to cover a portion for receiving the reflected light in the light receiving unit and having a second polarization axis. When the first polarization filter and the second polarization filter face each other in parallel to each other, the first polarization axis and the second polarization axis are formed at a predetermined angle to each other so that an image of a state in which the pattern of the hologram printed on the subject is removed is And a contact image sensor input to the light receiving unit. The method of claim 12, The light source unit is a contact image sensor, characterized in that formed in parallel with the linear light receiving unit. The method of claim 12, The first polarizing filter and the second polarizing filter is a PL filter, a CPL filter or a polarizing film, characterized in that the contact image sensor. The method of claim 12, And the first polarization filter is mounted to the light irradiation part to cover the light irradiation part of the light source part. The method of claim 12, The light receiving unit includes a lens system in which several lenses are linearly arranged to focus light passing through the second polarization filter; A photoelectric conversion element for converting light focused by the lens system into an electrical signal; A PCB substrate electrically connected to the photoelectric conversion element; A driving circuit attached to the PCB substrate to drive the photoelectric conversion element; And a connector electrically connected to the PCB substrate to transfer an electrical signal converted by the photoelectric conversion element to an external device. The second polarizing filter is mounted on the upper surface of the lens system to cover the lens system. The method of claim 16, And the first polarization filter is mounted to the light irradiation part to cover the light irradiation part of the light source part. The method of claim 12, And a transparent transmissive member that is transparent to light and is further provided on a path of light that travels between the light source unit and the subject and between the subject and the light receiving unit. The method of claim 18, And the first polarization filter is provided at a portion of the bottom surface of the transmitting member through which light irradiated from the light source unit toward the subject is transmitted. The method of claim 18, And the second polarization filter is installed at a portion of the bottom surface of the transmissive member through which light reflected from the subject toward the light receiver is transmitted. The method of claim 20, And the first polarization filter is provided at a portion of the bottom surface of the transmitting member through which light irradiated from the light source unit toward the subject is transmitted. The method according to any one of claims 12 to 21, The angle formed between the first polarization axis and the second polarization axis is 67 ° or more and 90 ° or less.

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