CN101986353A - Multi-angle optical characteristic detection method and device - Google Patents
Multi-angle optical characteristic detection method and device Download PDFInfo
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- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
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Abstract
The invention discloses a multi-angle optical characteristic detection method, which comprises the following steps of: acquiring two images of a predetermined area on a detected object from predetermined angles theta1 and theta 2 respectively by using a contact image sensor (CIS); and comparing the two images to judge whether the predetermined area has the multi-angle optical characteristics or not. The invention also provides a multi-angle optical characteristic detection device. The device comprises a light source, the CIS and an identification unit, wherein the predetermined area on the detected object is irradiated by the light source at the angles theta1 and theta2; reflected light on the area enters the CIS respectively so as to acquire the two images of the area respectively; and the identification unit processes and compares the two images to judge whether the area has the multi-angle optical characteristics or not (such as the color changing characteristic of color changing ink, the pattern of a holographic image). The invention also provides note or bill inspection equipment using the detection device. The multi-angle optical characteristic detection method and the multi-angle optical characteristic detection device have high detection identification rate and stable and reliable performance.
Description
Technical Field
The invention relates to the technical field of photoelectricity, in particular to a multi-angle optical characteristic detection method and device.
Background
The multi-angle optical characteristic means that when light rays irradiate from different angles or the observed object is observed from different angles, the observed object presents different image characteristics. The image seen by the printed product manufactured by adopting the multi-angle optical characteristic technology has the effect of dynamic change, cannot be copied by a high-definition scanner, a color copier and other equipment, and the design and production technology of the anti-counterfeiting paper has the advantages of professionality, complex manufacturing process, huge investment and difficulty in copying, so that the anti-counterfeiting paper is widely used for high-end anti-counterfeiting of paper money, important bills and trademarks.
The prior art with multi-angle optical characteristics is more, and the prior art has more general optical interference color-changing ink, holographic images, invisible patterns and the like.
Optical interference color-changing Ink (also called color-changing Ink, OVI, Optical Variable Ink) is a new type of Ink which is produced in the 90 s of the 20 th century and has dynamic color-changing effect. The pictures and texts printed by the ink can change different colors when viewed from different angles. Especially when viewed at around 0 degrees and around 60 degrees, two distinct colors appear. Since the use of the ink in 99 th edition of 100 yuan RMB, the anti-counterfeiting mark has not been imitated on counterfeit RMB, and becomes an important mark for identifying genuine RMB and counterfeit RMB. In addition, more and more optically variable ink is applied to other bills for anti-counterfeiting.
The holographic image is made by laser plate-making to the plastic film to produce the diffraction effect of five-color light, so that the picture has two-dimensional and three-dimensional sense. Under normal light, hidden images and information in the picture reappear, and when the light is irradiated from a certain specific angle, new images appear on the picture. At present, the paper money, trademarks and the like in multiple countries including Euro adopt holographic image technology to prevent counterfeiting.
The invisible patterns are mainly based on the gravure technology, and the refraction effect of the patterns is different according to different directions of gravure printing ink lines. When obliquely observed, the intensity of reflected light is different due to different ink grain directions, and hidden image information can be observed in the observed image. When the invisible image is observed vertically, the strength of the reflected light is irrelevant to the arrangement direction of the ink marks, and the invisible information in the image can be hidden. The invisible image is widely applied to paper money of multiple countries at present and is also applied to anti-counterfeiting of RMB of various denominations.
The multi-angle optical characteristics of the color-changing ink OVI, the holographic image and the like are mainly designed as anti-counterfeiting points on the human vision, so that most of the anti-counterfeiting by using the multi-angle optical characteristics of the color-changing ink or the holographic image and the like is finished by the human eyes at present, and the human eyes can present different colors when observing from different angles. The optical device can also be used for detecting and identifying the color presented by the ink by obtaining different optical characteristics from different angles under the irradiation of white light. No matter human eyes change angles to observe or a plurality of cameras shoot characters or image colors from different angles to identify, the essence of the method is to achieve the aim of multi-angle optical characteristic collection through angle change.
In the existing devices, a Complementary Metal-Oxide Semiconductor (CMOS) or Charge Coupled Device (CCD) camera is used to photograph a multi-angle optical characteristic (such as color-changing ink or holographic image) region of a banknote, so as to obtain an image of the relevant region, and then an image processing algorithm is used to identify the authenticity of the anti-counterfeit point. These devices have the following main features:
first, a set of image capture devices is installed at each location where a multi-angle optical feature area may appear. One set of devices is to design the positions of the light source and the camera according to the positions of the multi-angle optical characteristic areas shot, so that the camera can simultaneously obtain the front image (image shot from a roughly vertical angle) and the side image (image shot from a side edge at a certain inclination angle) of the paper money.
Secondly, because the positions of the paper money of different countries, different currencies and multi-angle optical characteristic regions on the paper money are different, one set of equipment is usually only suitable for multi-angle optical characteristic region detection of one or more currencies of the paper money of a certain country.
Thirdly, as the focal length of the camera adopting the CMOS or the CCD is larger, a certain shooting distance is required for shooting a certain range of visual field, and the volume required by the whole shooting device is often larger.
The above characteristics also determine that the equipment for detecting the multi-angle optical characteristics by adopting the CMOS or CCD camera has the following problems:
when a CMOS or CCD camera shoots, the movement of paper money in the money walking cavity and the theoretical movement situation are different to a certain extent, so that the position of the multi-angle optical characteristic area is in a certain distance from the theoretical position when the camera shoots images, and the relative positions of the front image, the side image, the multi-angle optical characteristic area and the light source are deviated from the design position when the camera shoots the images. This also ultimately affects the recognition effect of the color-changing ink.
Moreover, because the positions of the banknotes in which the multi-angle optical characteristic regions are located are different from one banknote to another due to different currencies, and a CMOS or CCD device must be installed at the positions of the multi-angle optical characteristic regions, the banknotes which are not located at the same position in the multi-angle optical characteristic regions can only be identified through a plurality of different devices. When a new version of paper money is issued, if the position of the multi-angle optical characteristic area changes, hardware redesign and updating must be carried out on the original equipment.
In addition, the required volume of the CMOS or CCD camera is large, and for the counting, testing and sorting equipment with compact internal design, the design requirement of the equipment is undoubtedly greatly increased, and the overall volume of the whole equipment is also increased.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for detecting multi-angle optical characteristics, which utilize a contact image sensor CIS to simultaneously acquire front and side images of paper money or other printed matters, and compare the acquired images, so as to achieve the purpose of detecting multi-angle optical characteristics (such as color-changing ink, holographic patterns, etc.).
The invention provides a multi-angle optical characteristic detection method, which adopts a Contact Image Sensor (CIS) to obtain an image of a preset area on a detected object, and comprises the following steps:
acquiring a first image of a preset area on the detected object from a first angle theta 1;
acquiring a second image of a preset area on the detected object from a second angle theta 2;
wherein the difference between the second angle θ 2 and the first angle θ 1 is greater than a predetermined value ω;
and comparing the first image with the second image to judge whether the area has multi-angle optical characteristics, wherein the multi-angle optical characteristics comprise color change characteristics of color change ink and pattern change characteristics of the holographic image.
The invention provides a multi-angle optical characteristic detection device, which comprises:
two light sources (302a, 302b), a lens, a contact image sensor CIS, a recognition unit;
the lens is arranged on a light path of the light reflected by the preset area to the CIS and used for guiding the light reflected by the preset area to the CIS sensor;
the first light source (302a) irradiates a preset area on the detected object at a first angle theta 1, and the second light source (302b) irradiates an area on the detected object at a second angle theta 2; the reflected light of the preset area is incident to the CIS sensor through the lens respectively, a first image and a second image of the preset area are obtained respectively and input to the recognition unit; wherein the difference between the second angle θ 2 and the first angle θ 1 is greater than a predetermined value ω;
and the identification unit is used for processing the first image and the second image and comparing the first image with the second image to judge whether the area has multi-angle optical characteristics, wherein the multi-angle optical characteristics comprise color change characteristics of color change ink and pattern change characteristics of a holographic image.
The invention provides another multi-angle optical characteristic detection device, which comprises a light source, two lenses and two CIS sensors; wherein,
the light source is used for irradiating a preset area on the detected object;
a first CIS sensor at a first inclination angle
Setting, receiving the predetermined areaReflecting light to obtain a first image of the predetermined area;
a second CIS sensor at a second inclination angle
Setting, receiving the reflected light of the preset area to obtain a second image of the preset area;
the two lenses are respectively arranged on the light paths of the light reflected by the preset area to the first CIS sensor and the second CIS sensor and used for guiding the light reflected by the preset area to the corresponding CIS sensors.
Wherein the second angle of inclination
To the first angle of inclination
Is greater than a predetermined value ω;
and the identification unit is used for processing the first image and the second image and comparing the first image with the second image to judge whether the area has multi-angle optical characteristics, wherein the multi-angle optical characteristics comprise color change characteristics of color change ink and pattern change characteristics of a holographic image.
The invention also provides a paper money or bill checking device, which comprises the multi-angle optical characteristic detection device and an indicating device;
the multi-angle optical characteristic detection device is used for detecting the characteristics of a preset area on the paper money or the bill and sending the detection result to the indicating device;
and the indicating device outputs an indicating signal for indicating whether the detected paper money or bill is true or not according to the detection result provided by the multi-angle optical characteristic detection device.
Preferably, the banknote or bill testing apparatus further comprises:
and the warning device is used for receiving the detection result provided by the multi-angle optical characteristic detection device and outputting a warning audio signal according to the detection result.
In the method and the device for detecting the multi-angle optical characteristics, the contact image sensor CIS is adopted to collect the front and side images of the paper money or other printed matters, and the incident angle and the reflection angle of light are fixed, so the collected image light is more uniform. Secondly, for different currencies, even if the positions of the banknotes with multi-angle optical characteristics (such as color-changing ink, holographic patterns and the like) are different, the detection of the banknotes with different currencies can be finished by one set of equipment. When new-edition paper money is issued, equipment upgrading can be completed only through software upgrading. Compared with a CMOS or CCD camera, the CIS has small volume and very convenient installation, and can ensure that the structure is more compact and the equipment is more convenient to assemble when a mechanical part is designed. As for one device, the detection of the multi-angle optical characteristics of the front face and the back face of one paper currency can be finished only by installing one CIS on each face of a channel. The multi-angle optical characteristic detection method and the device provided by the invention have the advantages of high detection and identification rate and stable and reliable performance.
Drawings
Fig. 1 is a schematic structural diagram of a detection device using a contact image sensor CIS provided in the prior art;
FIG. 2 is a flow chart of a multi-angle optical characteristic detection method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a multi-angle optical signature detection apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another multi-angle optical signature detection apparatus according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram of a multi-angle optical signature detection apparatus according to a third embodiment of the present invention;
fig. 6 is a schematic diagram of the structure of the banknote or bill checking apparatus provided in the fourth embodiment of the present invention.
Detailed Description
In order to detect the multi-angle optical characteristics and make the area on the shot image show different optical characteristics, the object to be detected is irradiated at different angles as much as possible, and shooting at different angles is carried out as much as possible. The invention provides a method for acquiring images of different angles in a preset area on an object to be detected by using a Contact Image Sensor (CIS) to achieve the purpose of detecting multi-angle optical characteristics (such as color-changing ink, holographic patterns and the like).
In general, the contact image sensor CIS is used only to capture an image of a perspective or an underlying reflection. The invention provides a method and a device for detecting color-changing ink, which utilize a contact image sensor CIS to simultaneously acquire front and side images of paper money or other printed matters, and extract multi-angle optical characteristics (such as color of the color-changing ink and holographic patterns) of the images so as to identify whether the images in a detected area correspond to the multi-angle optical characteristics.
Fig. 1 is a schematic structural diagram of a conventional detection device using a contact image sensor CIS. As can be seen from fig. 1, when an object to be detected 101 (bill or print) is photographed by visible light reflection, light is incident on the object to be detected 102 at a nearly vertical angle by the visible light source 102, and the reflected light is reflected at a vertical angle into the lens 103 and is finally imaged by the CIS sensor 104. Such reflection imaging may be an image obtained by irradiating and capturing an object.
In order to detect multi-angle optical characteristics such as color-changing ink and hologram and to make the photographed image have an effect of different colors (for color-changing ink) or different patterns (for hologram), the side surface of the object to be inspected is irradiated as much as possible and the side surface photographing is performed. According to the technical scheme provided by the invention, the CIS is used for collecting the side images so as to achieve the purpose of detecting multi-angle optical characteristics such as color-changing ink, holographic images and the like.
The present invention is described in detail below with reference to specific embodiments in order to make the principles, features and advantages of the invention clearer.
Example one
The embodiment of the invention provides a method for detecting multi-angle optical characteristics, which can detect and identify color-changing ink on paper money, bills or other printed matters.
Referring to fig. 2, a multi-angle optical characteristic detection method provided by an embodiment of the present invention includes the following steps:
s201, acquiring a first image of a preset area on a detected object from a first angle theta 1;
s202, acquiring a second image of a preset area on the detected object from a second angle theta 2;
wherein the difference between the second angle θ 2 and the first angle θ 1 is greater than a predetermined value ω;
for example, the first angle θ 1 and the second angle θ 2 are both included with a direction perpendicular to the detected object. The first angle theta 1 is smaller than 30 degrees, the angle theta 1 is as small as possible, the closer the angle is to the vertical, the better, but the angle theta 1 is not equal to 0 degree (namely the vertical angle), so that the imaging effect is prevented from being influenced; the second angle θ 2 is greater than 60 degrees; the predetermined value ω is greater than 50 degrees.
The first angle theta 1 and the second angle theta 2 are included angles between incident light and a detected object (such as paper money, bills or other printed objects) in the vertical direction during detection.
S203, comparing the first image with the second image to judge whether the area has multi-angle optical characteristics, wherein the multi-angle optical characteristics comprise color change characteristics of color change ink and pattern change characteristics of a holographic image. For example, by comparing the two images, it can be determined whether the ink is a color-changing ink or whether the pattern is a holographic image.
Specifically, in the multi-angle optical characteristic detection method provided in the embodiment of the invention, two groups of light sources (I, II), a lens, and a group of CIS sensors receiving light signals are provided. A lens disposed on an optical path of light reflected from a predetermined region (such as an ink region to be measured or a hologram image region) to the CIS sensor, so that the reflected light reflected from the predetermined region is directed to the CIS sensor and imaged; one light source irradiates a preset area on a detected object (such as paper money, bills or other printed objects) at a small incidence angle theta 1 (an included angle with the vertical direction), and reflected light of the preset area is imaged on a CIS sensor in a direction perpendicular to the detected object to obtain a first image of the preset area; and the other light source irradiates a predetermined area on the detected object at a relatively large incident angle theta 2, and the reflected light of the other light source forms an image on the CIS sensor in a direction perpendicular to the detected object, thereby acquiring a second image of the predetermined area. It should be noted that the difference between the incident angles θ 2 and θ 1 of the light source illumination should be larger than a predetermined value, so that the predetermined area on the detected object is acquired at the incident angles θ 2 and θ 1 respectively to present different multi-angle optical characteristics. Specifically, the color-changing ink patterns appear to have different colors on the CIS sensor, and the hologram image appears to have different patterns on the CIS sensor.
FIG. 3 is a schematic structural diagram of a multi-angle optical characteristic detection apparatus according to an embodiment of the present invention.
As shown in FIG. 3, the multi-angle optical signature detection device includes two light sources 302a, 302b, a lens 303, and a CIS sensor 304. And the lens 303 is arranged on the light path of the reflected light of a preset area of the detected object 301 (such as paper money, bills or other printed matters) to the CIS sensor and is used for guiding the reflected light of the preset area to the CIS sensor 304. The light source 302a irradiates the object 301 (such as a bill, or other printed matter) to be detected at a small incident angle θ 1 (an angle from the vertical direction), while the light source 302b irradiates the object 301 to be detected at a relatively large incident angle θ 2, and the reflected light forms an image on the CIS sensor in a direction perpendicular to the object to be detected. The difference between θ 2 and θ 1 should be greater than a predetermined value to cause different multi-angle optical features to appear on the inspected object, for example, for color-changing inks, the area appears in different colors on the CIS sensor. In a specific application, the light source 302a and the light source 302b are turned on at intervals, for example, first, the light source 302a is turned on, the light source 302b is turned off, and the CIS sensor acquires a line of image data; then, the light source 302b is turned on, the light source 302a is turned off, and the CIS sensor acquires a row of image data; this then alternately turns on light sources 302a, 302b, turns off light sources 302b, 302a, and so on. Thus, when the detected object completely passes through the CIS sensor, the CIS sensor can output a color image. The odd rows of the image are illuminated by light source 302a and the even rows are illuminated by light source 302 b. Specifically, a software image processing method may be used to combine the odd lines of the CIS sensor output image into an image that is completely illuminated by the light source 302a, and combine the even lines into an image that is completely illuminated by the light source 302 b. The image irradiated by the light source 302a is obtained by front-side irradiation and front-side imaging, and thus can be considered as an image observed on the front side of the bill or the printed matter. The image obtained by the light source 302b is irradiated, although it is shot in the front direction, the incident angle of the light source 302b is large, which can also make the detected object show different multi-angle optical characteristics, for example, the obtained image shows different multi-angle optical characteristics, specifically, the image shows different colors (for color-changing ink) or different patterns (for holographic image), which is equivalent to the image obtained by observing the detected object (such as paper money or printed matter) in the side direction. Thus, for example, with regard to the color-changing ink, images of two colors of the color-changing ink have been actually obtained simultaneously with the CIS sensor. Then, the identification unit (not shown in the figure) performs subsequent image processing on the obtained front image and the obtained side image, and compares the obtained front image and the obtained side image to judge whether the area has multi-angle optical characteristics, wherein the multi-angle optical characteristics comprise color change characteristics of color change ink and pattern change characteristics of a holographic image. If the ink is the color-changing ink, the pattern is the holographic image. And judging the authenticity of the paper currency or the printed matter according to the multi-angle optical characteristics on the two images.
Example two
FIG. 4 is a schematic structural diagram of another multi-angle optical characteristic detecting apparatus according to an embodiment of the present invention. Referring to fig. 4, the main difference from the first multi-angle optical characteristic detecting device in the first embodiment is that, in the multi-angle optical characteristic detecting device provided in the first embodiment, two light sources 402a and 402b are disposed on the same side of a lens 403, the lens 403 and a CIS sensor 404 are disposed obliquely to the plane of an object to be detected 401, and reflected light reflected from the object to be detected forms an image on the CIS sensor in a direction oblique to the object to be detected; in the multi-angle optical characteristic detection apparatus of the first embodiment, the two light sources are respectively located at two sides of the lens, and the lens 403 and the imaging sensor 404 are arranged right opposite to the plane of the detected object 401, that is, the reflected light reflected from the detected object forms an image on the sensor in a direction perpendicular to the detected object. The two light sources 402a, 402b are mounted on the same side of the lens 403, which allows the lens 403 to have a certain tilt angle, so that the light reflected by the side light source 402b can be more fully incident on the sensor. However, the lens and the sensor are mounted at an angle, which requires a high manufacturing process. The working flow of the multi-angle optical feature detection device in this embodiment is substantially the same as that of the multi-angle optical feature detection device in the first embodiment, and two light sources should be alternately turned on to obtain corresponding images, wherein the odd-numbered line light source 402a irradiates to obtain an image, and the even-numbered line light source 402b irradiates to obtain an image.
Then, a recognition unit (not shown in the figure) performs subsequent image processing on the obtained front image and the side image, and compares the multi-angle optical characteristics (such as the color of the color-changing ink or the pattern of the holographic image) of the obtained front image and the obtained side image to determine whether the area has the multi-angle optical characteristics, wherein the multi-angle optical characteristics include the color-changing characteristics of the color-changing ink and the pattern changing characteristics of the holographic image. If the ink is the color-changing ink, the pattern is the holographic image. And judging the authenticity of the paper currency or the printed matter according to the multi-angle optical characteristics on the two images.
EXAMPLE III
FIG. 5 is a schematic structural diagram of another multi-angle optical characteristic detecting apparatus according to an embodiment of the present invention. Referring to fig. 5, the multi-angle optical characteristic detecting apparatus provided in this embodiment includes a light source 502; two sets of lenses 503a, 503b and sensors 504a, 504 b; and the lenses 503a and 503b are arranged on the light path of the ink area reflected light on the detected object 501 to the CIS sensor and used for guiding the ink area reflected light to the CIS sensors 504a and 504 b. As can be seen from fig. 6, the light source 502 is located in the middle, one set of the lens 503a and the sensor 504a is disposed opposite to the detected object, and the other set of the lens 503b and the sensor 504b is disposed at an oblique angle to the detected object 501. The light source irradiates the object to be detected on the front surface and then vertically reflects the object to the lens 503a to the sensor 504a, so as to obtain a front image. After the oblique illumination, the light is obliquely reflected at a relatively large angle to the lens 503b to the sensor 504b, and a side image is obtained. In the multi-angle optical characteristic detection device provided in this embodiment, because there is only one set of light sources, compared with the two devices, the light sources at different positions do not need to be switched in the acquisition process. The two sensors 504a, 504b can obtain a complete image, respectively, and the front side image of front illumination and front shooting is obtained from the left side sensor 504a, and the image obtained from the right side sensor 504b is the side image of side illumination and side shooting. The two images can be subjected to multi-angle optical characteristic detection by utilizing a rear-end image processing algorithm. Because the two sensors do not have the multiplexing condition, the angle can be designed reasonably, and the light sensing of the sensors is sufficient.
Then, a recognition unit (not shown in the figure) performs subsequent image processing on the obtained front image and the side image, and compares the multi-angle optical characteristics (such as the color of the color-changing ink or the pattern of the holographic image) of the obtained front image and the obtained side image to determine whether the area has the multi-angle optical characteristics, wherein the multi-angle optical characteristics include the color-changing characteristics of the color-changing ink and the pattern changing characteristics of the holographic image. If the ink is the color-changing ink, the pattern is the holographic image. And judging the authenticity of the paper currency or the printed matter according to the multi-angle optical characteristics on the two images.
Example four
The embodiment of the invention also provides a paper currency or bill inspection device, which can detect paper currency, bills or other printed matters using multi-angle optical characteristics such as color-changing ink and holographic images as anti-counterfeiting measures by adopting the multi-angle optical characteristic detection device in the embodiment so as to judge and identify the authenticity of the paper currency, the bills or the other printed matters.
Referring to fig. 6, a banknote or ticket checking apparatus 600 provided by an embodiment of the present invention includes a multi-angle optical characteristic detecting device 610 provided in the previous embodiments, and an indicating device 620;
a multi-angle optical characteristic detecting device 610 for detecting a predetermined area on the bill or ticket and transmitting the detection result to the indicating device;
and the indicating device 620 outputs an indicating signal for indicating whether the detected paper money or bill is true or not according to the detection result provided by the multi-angle optical characteristic detecting device 610.
The banknote or bill inspection apparatus 600 provided in the embodiment of the present invention further includes:
and the alarm device 630 is configured to receive the detection result provided by the multi-angle optical characteristic detection device 610, and output an alarm audio signal according to the detection result.
In the multi-angle optical characteristic detection method and the device provided by the invention, the contact image sensor CIS is adopted to collect the front and side images of the paper money or other printed matters, and the incident angle and the reflection angle of light are fixed, so that the collected image light is more uniform. Secondly, for different currencies, even if the positions of the color-changing ink or the holographic image are different from each other, the detection of the banknotes of different currencies can be completed by one set of equipment. When new-edition paper money is issued, equipment upgrading can be completed only through software upgrading. Compared with a CMOS or CCD camera, the CIS has small volume and very convenient installation, and can ensure that the structure is more compact and the equipment is more convenient to assemble when a mechanical part is designed. For one device, detection of multi-angle optical characteristics such as color-changing ink and holographic images of the front face and the back face of one paper currency can be completed by only installing one CIS on each of two faces of a channel.
The disclosed embodiments are provided to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope or spirit of the invention. The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (11)
1. A multi-angle optical characteristic detection method is characterized in that a Contact Image Sensor (CIS) is adopted to obtain an image of a preset area on a detected object, and the method comprises the following steps:
acquiring a first image of a preset area on the detected object from a first angle theta 1;
acquiring a second image of a preset area on the detected object from a second angle theta 2;
wherein the difference between the second angle θ 2 and the first angle θ 1 is greater than a predetermined value ω;
and comparing the first image with the second image to judge whether the area has multi-angle optical characteristics, wherein the multi-angle optical characteristics comprise color change characteristics of color change ink and pattern change characteristics of the holographic image.
2. The method according to claim 1, wherein the acquiring a first image of a predetermined area on the object under inspection from a first angle θ 1 specifically comprises:
the method comprises the following steps that a light source irradiates a preset area on an object to be detected at a first angle theta 1, and reflected light reflected from the preset area enters a CIS sensor through a lens to be imaged;
the acquiring a second image of a predetermined area on the detected object from the second angle θ 2 specifically includes:
the light source irradiates a preset area on the detected object at a second angle theta 2, and reflected light reflected from the preset area enters the CIS sensor through the lens and is imaged.
3. The method according to claim 1, wherein the acquiring a first image of a predetermined area on the object under inspection from a first angle θ 1 specifically comprises:
the light source irradiates a preset area on the detected object at a preset angle; reflected light reflected from the preset area is incident to a first CIS sensor at an angle theta 1 through a first lens and then is imaged;
the acquiring of the first image of the predetermined area on the detected object from the second angle θ 2 specifically includes:
the light source irradiates a preset area on the detected object at a preset angle; and the reflected light reflected from the preset area is incident to the second CIS sensor at an angle theta 2 through the second lens and then is imaged.
4. The method of claim 1, 2 or 3,
the first angle theta 1 is less than 30 degrees, and the second angle theta 2 is greater than 60 degrees;
the predetermined value ω is greater than 50 ° degrees.
5. A multi-angle optical signature detection apparatus, comprising:
two light sources (302a, 302b), a lens, a contact image sensor CIS, a recognition unit;
the lens is arranged on a light path of the light reflected by the preset area to the CIS and used for guiding the light reflected by the preset area to the CIS sensor;
the first light source (302a) irradiates a preset area on the detected object at a first angle theta 1, and the second light source (302b) irradiates an area on the detected object at a second angle theta 2; the reflected light of the preset area is incident to the CIS sensor through the lens respectively, a first image and a second image of the preset area are obtained respectively and input to the recognition unit; wherein the difference between the second angle θ 2 and the first angle θ 1 is greater than a predetermined value ω;
and the identification unit is used for processing the first image and the second image and comparing the first image with the second image to judge whether the area has multi-angle optical characteristics, wherein the multi-angle optical characteristics comprise color change characteristics of color change ink and pattern change characteristics of a holographic image.
6. The apparatus of claim 5,
the two light sources are arranged on the same side of the lens, and the lens and the CIS sensor are arranged obliquely to the plane of the object to be detected.
7. The apparatus of claim 5 or 6,
the first angle theta 1 is less than 30 degrees, and the second angle theta 2 is greater than 60 degrees;
the predetermined value ω is greater than 50 ° degrees.
8. A multi-angle optical characteristic detection device is characterized by comprising a light source, two lenses and two CIS sensors; wherein,
the light source is used for irradiating a preset area on the detected object;
a first CIS sensor at a first inclination angle
Setting, receiving the reflected light of the preset area to obtain a first image of the preset area;
a second CIS sensor at a second inclination angle
Setting, receiving the reflected light of the preset area to obtain a second image of the preset area;
the two lenses are respectively arranged on the light paths of the light reflected by the preset area to the first CIS sensor and the second CIS sensor and used for guiding the light reflected by the preset area to the corresponding CIS sensors.
Wherein the second angle of inclination
To the first angle of inclination
Is greater than a predetermined value ω;
and the identification unit is used for processing the first image and the second image and comparing the first image with the second image to judge whether the area has multi-angle optical characteristics, wherein the multi-angle optical characteristics comprise color change characteristics of color change ink and pattern change characteristics of a holographic image.
9. The apparatus of claim 8,
the first angle theta 1 is less than 30 degrees, and the second angle theta 2 is greater than 60 degrees;
the predetermined value ω is greater than 50 ° degrees.
10. A banknote or ticket checking apparatus comprising the multi-angle optical signature detection device of claim 3, 4 or 5, and an indicating device;
the multi-angle optical characteristic detection device is used for detecting the characteristics of a preset area on the paper money or the bill and sending the detection result to the indicating device;
and the indicating device outputs an indicating signal for indicating whether the detected paper money or bill is true or not according to the detection result provided by the multi-angle optical characteristic detection device.
11. The apparatus of claim 10, further comprising:
and the warning device is used for receiving the detection result provided by the multi-angle optical characteristic detection device and outputting a warning audio signal according to the detection result.
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| PCT/CN2011/077783 WO2012058954A1 (en) | 2010-11-02 | 2011-07-29 | Method and apparatus for detecting multi-angle optical feature |
| CN2011103185345A CN102339494A (en) | 2010-11-02 | 2011-10-19 | Contact image sensor, multi-angle optical characteristic detection method and device |
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