EP1136957A1 - Dispositif de contrôle optique d'une pièce de monnaie - Google Patents
Dispositif de contrôle optique d'une pièce de monnaie Download PDFInfo
- Publication number
- EP1136957A1 EP1136957A1 EP01105902A EP01105902A EP1136957A1 EP 1136957 A1 EP1136957 A1 EP 1136957A1 EP 01105902 A EP01105902 A EP 01105902A EP 01105902 A EP01105902 A EP 01105902A EP 1136957 A1 EP1136957 A1 EP 1136957A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coin
- lens
- image
- camera
- illumination
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
- G07D5/005—Testing the surface pattern, e.g. relief
Definitions
- the invention relates to a device for the optical inspection of a coin.
- an optical coin validator in which the one to be checked Coin is imaged on a filter with the aid of optics.
- the filter is a Negative image of an original coin or the Fourier transform of the coin.
- a photo sensor is located behind the filter the better coin and filter in the geometric representation and in the angular position correlate. The signal from the photo sensor is sent to evaluation electronics forwarded.
- a diffuse illumination with a fluorescent lamp is known from DE 42 22 984.
- they are identified on an image analysis unit passed by.
- the light intensity along with a line compared upper and lower threshold values.
- the invention has for its object a device for optical testing to provide a coin that is easy to get a good picture of the coin to be checked Coin generates reliable detection with little effort enables.
- the object is achieved by a device according to claim 1.
- the image recording device of the device according to the invention has a Camera with a lens for telecentric imaging of the coin.
- a Camera with a lens for telecentric imaging of the coin.
- Advantageous What is special about the use of a telecentric image is that it is a special one enables accurate and high-contrast imaging of the coin surface. Through the telecentric imaging results in an independent of the object distance Image scale, which is particularly useful for examining the surface of the coin and their structure and the shape test is particularly advantageous.
- the radiation source the lighting device is in the device according to the invention for optical inspection of a coin arranged so that bright field lighting takes place.
- the coin surface to be examined prevents the passage of light and deflects the light.
- the lighting used with incident light has the advantage that the structures of the coin surface are particularly well illuminated become.
- an inventive device for optical inspection a coin an evaluation device that the captured image of the evaluating coin only in one or more limited object fields.
- the evaluation device according to the invention is limited in the present invention on one or more object fields, that only affect part of the surface of the coin. This will make the one to be processed Data volume significantly reduced.
- a significant reduction in the evaluation device captured surface is due to a particularly high-contrast and accurate reproduction possible on the surface of the coin.
- Such an optically high-quality image is achieved by combining a camera with telecentric imaging and a Incident lighting achieved.
- the coin If the coin be checked for any position of the Coin, it proves advantageous to use two object fields, to easily determine the orientation of the coin in the receiving plane.
- the orientation of the connecting line can be determined using the two object fields determined between the object fields and with a predetermined Orientation of the coin can be compared for evaluation.
- the object field points for a particularly reliable optical inspection of the coin an area of the coin surface with a comparatively fine embossing on. Especially in the area with fine embossing, as is the case with a Forehead wrinkle or the nose of an embossed head is a reliable recognition the coin possible.
- the evaluation is carried out by comparing that recorded in the object field Image with predetermined image data to generate a real or false signal.
- the evaluation of whether the coin to be checked is genuine or false is based on the data of the image recorded in the object field.
- the captured image data are compared with predetermined image data, the data for a Comparison can also be transformed. For the comparison of those in the object field recorded data with the specified image data can in itself known algorithms of image processing can be accessed.
- the light from the lighting device is transmitted through a partially transparent mirror, on the optical axis between the imaging device and the coin is arranged directed to the coin.
- the light from the radiation source is ie via a partially transparent mirror element in the beam path of the image recording device coupled.
- the lighting is carried out via a telecentric Lens.
- a telecentric Lens Such illumination of the surface of the coin with parallel Beams of light enable particularly uniform and high-contrast illumination of the object field to be examined.
- the optical axes of the light bundle and the image bundle behind the mirror In an expedient continuation of the lighting device, the optical axes of the light bundle and the image bundle behind the mirror.
- the optical axes of the lighting device and the image recording device run here behind the semitransparent mirror parallel to each other. It This creates a particularly detailed picture of the coin surface with high contrasts.
- the optical axes of the lighting bundles and imaging bundles intersect in the plane of the coin surface. This creates skewed lighting the surface of the coin for certain measuring tasks or for certain Configurations of the coin surface can be advantageous. For example such lighting for a relief height determination by a drop shadow length measurement.
- the telecentric Lens of the image recording device and the telecentric lens the lighting device on an adjustable aperture can both illuminance through the in a particularly simple manner Illumination device and the illuminance present on the camera can be set independently of each other. This enables quick and easy adjustment of the device for different coins. Moreover the detail recognizability is influenced by these panels.
- the partially transparent mirror of the device according to the invention has a plane Surface with approximately 50% reflectivity.
- a planar surface is particularly advantageous. The thinner the Mirror, the less the image is affected.
- a particularly advantageous development of the device according to the invention is used a semitransparent mirror, the reflected and transmitted light linearly polarized, the polarization directions being perpendicular to one another.
- a semi-transparent mirror By using such a semi-transparent mirror, none Rays reflected directly from the object to the camera, but only at the Scattered light can pass through the partially translucent mirror Camera. This leads to that in conventional bright field lighting bright areas now appear dark, and those in the conventional Bright field lighting dark appearing areas appear bright.
- Such Lighting requires either a particularly light-sensitive camera or one particularly strong light source.
- Advantageous in such a polarizing mirror is that there is a particularly high-contrast image of the coin surface.
- a halogen incandescent lamp is expediently used as the radiation source in the device, Short-arc lamp or LED provided with additional field lens. This Radiation sources provide sufficiently strong lighting for the test subject Coin surface safe.
- a conventional matrix camera can be provided as the camera. This takes a complete one Image of the coin surface or an image of the selected sections.
- a line scan camera be provided.
- An additional translatory is used to accommodate surfaces Movement of the coin required.
- With a line scan camera are higher optical Resolutions and shorter recording times achievable.
- line scan camera takes place in that a fiber-optic cross-section converter between the light source and the partially transparent mirror is arranged with a linear exit surface and that this exit surface by means of an anamorphic lens made of two cylindrical lenses over the partially transparent one Mirror is mapped onto the coin surface.
- anamorphic Only the line width of the exit surface is shown sharply, while an intensity averaging with respect to the line length over adjacent fiber ends Blurring takes place.
- the second cylindrical lens is replaced by a Fresnel lens replaced or a Fresnel lens as the third component of the anamorphic added.
- the Fresnel lens enables additional imaging effects with regard to the line length, e.g. to shorten the illuminated length.
- a light source including field lens 10, they emerge for illumination certain light rays through a telecentric lens 12.
- the field lens 10 is arranged with respect to the lens 12 so that the light rays behind the Lens 12 run in a substantially parallel light beam 14.
- the bundle of light strikes a semitransparent mirror 16 which is arranged around the light rays of the illumination beam 14 on the surface of an object to be examined Steer coin 18. In the embodiment shown in Fig. 1, the Illumination perpendicular to the surface 18 of the coin to be checked.
- the light reflected by the coin surface 20 occurs as a receiving bundle 20 through the semi-transparent mirror 16 and through the telecentric Imaging lens 22 focused in the camera 26.
- 24 represents the focused bundle of images
- the camera 26 is in a receiving device 28 is arranged.
- the one recorded by the camera 26 Image of the coin surface 18 is obtained from the evaluation device (not shown) in FIG one or more limited object fields evaluated to ensure the authenticity of the checking coin.
- the object fields are predetermined areas of the coin surface, such as Forehead lines of a head or fine pattern on which the authenticity of the test Coin is clearly recognizable.
- the object fields can, for example, in the Evaluation device in the recorded image of the coin surface by a Limitation of the section can be determined and processed for comparison be, the detection of the object fields regardless of the location Coin can be made. Capturing the marking of the mint may be necessary if the embossments to be checked are of different types Details included.
- FIG. 2 An alternative embodiment using a fiber optic cross-sectional converter 30 will be explained with reference to FIG. 2.
- the collected in the lighting source 10 Light is transmitted to a cross-sectional converter 30 via a fiber optic conductor headed.
- the exit surface 31 of the cross-sectional converter is aligned so that the Beams of light over an anamorphic lens 32 consisting of two cylindrical lenses a partially transparent mirror 16 is directed. From here the light comes on Object level 18 on the coin to be considered.
- the reflected light is about a lens 22 is projected onto the line camera 36.
- the lens 22 and the line camera 36 spaced from each other in such a way that in the image plane Camera creates a telecentric image of the coin surface 18.
- one of the two anamorphic cylindrical lenses 32 can be designed as Fresnel lenses. It is also possible in addition to two cylindrical lenses to use a Fresnel lens in the anamorphic.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Image Input (AREA)
- Testing Of Coins (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE20004826U DE20004826U1 (de) | 2000-03-16 | 2000-03-16 | Vorrichtung zur optischen Prüfung einer Münze |
DE20004826U | 2000-03-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1136957A1 true EP1136957A1 (fr) | 2001-09-26 |
Family
ID=7938825
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01105902A Withdrawn EP1136957A1 (fr) | 2000-03-16 | 2001-03-09 | Dispositif de contrôle optique d'une pièce de monnaie |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1136957A1 (fr) |
DE (1) | DE20004826U1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004049267A1 (fr) * | 2002-11-23 | 2004-06-10 | Odas Gmbh | Procede d'enregistrement photographique d'un objet cylindrique, notamment en forme de disque |
EP1681558A1 (fr) * | 2005-01-18 | 2006-07-19 | Roche Diagnostics GmbH | Imagerie de signaux fluorescents en utilisant des optiques télécentriques pour l'excitation et pour l'imagerie |
EP1681555A1 (fr) * | 2005-01-18 | 2006-07-19 | Roche Diagnostics GmbH | Imagerie de signaux fluorescents en utilisant une optique télécentrique |
EP1681556A1 (fr) * | 2005-01-18 | 2006-07-19 | Roche Diagnostics GmbH | Imagerie de signaux fluorescents en utilisant la télécentricité |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012212221A (ja) * | 2011-03-30 | 2012-11-01 | Fujifilm Corp | 撮像ユニット、及び硬貨識別装置 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3514779C2 (fr) | 1985-04-24 | 1987-09-03 | Wolfgang 8800 Ansbach De Friess | |
DE4004431A1 (de) | 1990-02-09 | 1991-08-14 | Peter Krumhauer | Optische muenzpruefung |
DE4222984A1 (de) | 1991-07-12 | 1993-03-04 | Proditec Sa | System zur automatischen sortierung von geldstuecken |
EP0546341A1 (fr) * | 1991-12-10 | 1993-06-16 | Ascom Autelca Ag | Méthode pour l'examen d'une pièce de monnaie |
JPH06150104A (ja) * | 1992-11-13 | 1994-05-31 | Laurel Bank Mach Co Ltd | 貨幣パターン検出装置 |
JPH08279062A (ja) * | 1995-04-06 | 1996-10-22 | Oki Electric Ind Co Ltd | 硬貨認識装置 |
US5576825A (en) * | 1992-11-13 | 1996-11-19 | Laurel Bank Machines Co., Ltd. | Pattern detecting apparatus |
-
2000
- 2000-03-16 DE DE20004826U patent/DE20004826U1/de not_active Expired - Lifetime
-
2001
- 2001-03-09 EP EP01105902A patent/EP1136957A1/fr not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3514779C2 (fr) | 1985-04-24 | 1987-09-03 | Wolfgang 8800 Ansbach De Friess | |
DE4004431A1 (de) | 1990-02-09 | 1991-08-14 | Peter Krumhauer | Optische muenzpruefung |
DE4222984A1 (de) | 1991-07-12 | 1993-03-04 | Proditec Sa | System zur automatischen sortierung von geldstuecken |
EP0546341A1 (fr) * | 1991-12-10 | 1993-06-16 | Ascom Autelca Ag | Méthode pour l'examen d'une pièce de monnaie |
JPH06150104A (ja) * | 1992-11-13 | 1994-05-31 | Laurel Bank Mach Co Ltd | 貨幣パターン検出装置 |
US5576825A (en) * | 1992-11-13 | 1996-11-19 | Laurel Bank Machines Co., Ltd. | Pattern detecting apparatus |
JPH08279062A (ja) * | 1995-04-06 | 1996-10-22 | Oki Electric Ind Co Ltd | 硬貨認識装置 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004049267A1 (fr) * | 2002-11-23 | 2004-06-10 | Odas Gmbh | Procede d'enregistrement photographique d'un objet cylindrique, notamment en forme de disque |
EP1681558A1 (fr) * | 2005-01-18 | 2006-07-19 | Roche Diagnostics GmbH | Imagerie de signaux fluorescents en utilisant des optiques télécentriques pour l'excitation et pour l'imagerie |
EP1681555A1 (fr) * | 2005-01-18 | 2006-07-19 | Roche Diagnostics GmbH | Imagerie de signaux fluorescents en utilisant une optique télécentrique |
EP1681556A1 (fr) * | 2005-01-18 | 2006-07-19 | Roche Diagnostics GmbH | Imagerie de signaux fluorescents en utilisant la télécentricité |
EP1681557A1 (fr) * | 2005-01-18 | 2006-07-19 | Roche Diagnostics GmbH | Imagerie de signaux fluorescents en utilisant des optiques télécentriques d'excitation et d'imagerie |
US7369227B2 (en) | 2005-01-18 | 2008-05-06 | Roche Diagnostics Operations, Inc. | Imaging fluorescence signals using telecentricity |
US7687260B2 (en) | 2005-01-18 | 2010-03-30 | Roche Diagnostics Operations, Inc. | Imaging fluorescence signals using telecentric optics |
Also Published As
Publication number | Publication date |
---|---|
DE20004826U1 (de) | 2000-06-15 |
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18D | Application deemed to be withdrawn |
Effective date: 20080628 |