JPH0219992A - Stained bill detector - Google Patents

Abstract

PURPOSE:To prevent the payment of a stained bill by recognizing the kind of currency and the direction of the bill by a signal from a transmission type linear image sensor and recognizing the stain of the bill by another signal from a reflection type linear image sensor. CONSTITUTION:The title device is equipped with a transmission type linear image sensor 1, reflection type linear image sensors 2 and 3, and a recognition processing part 5. Further, the device recognizes the kind of currency and the direction of the bill by identifying the number and the positions of round hole shaped watermarks from picture data obtained from the output of the transmission type image sensor 1, further extracts the picture data of watermark parts from picture data obtained from the outputs of the reflection type image sensors 2 and 3, and detects the stained bill by comparing the luminance distribution of the extracted picture data with the luminance distribution of the picture data when the bill has no stain. Thus, the paying out of the stained bill can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a cash deposit system in a financial institution such as a bank, and particularly to a defaced banknote detection device.

[Conventional technology]

Conventionally, in visual teller machines, the most important aspects are determining the authenticity and denomination of banknotes, and discrimination has been performed by recognizing printed designs and magnetic ink patterns on banknotes.

``Also, as a recent trend, there has been an attempt to determine the front and back sides of a banknote as well as the denomination by using a scarf part indicating the denomination on the banknote (for example, according to tF!PH No. 1988-276848).

[Problem to be solved by the invention]

By distinguishing the authenticity and denomination of the above-mentioned conventional depository machines, it is possible to prevent accidents such as accepting items other than banknotes as banknotes and dispensing the wrong amount of banknotes. Even if the banknotes to be deposited are genuine, they are not necessarily clean; for example, even banknotes with graffiti or dirt on them can be accepted. Automatic recycling devices, which have become popular in recent years, have the disadvantage that tainted banknotes are dispensed as they are to the customer, which offends the customer who took the banknotes.

SUMMARY OF THE INVENTION An object of the present invention is to provide a defaced banknote detection device that improves the above-mentioned drawbacks by detecting defacement M' as well as the denomination.

[Means to solve the problem]

The soiled banknote detection device of the present invention includes a light source that illuminates the banknote surface, a base lens that collects light generated from the f source and transmitted through the banknote, and detects an image obtained by the condenser lens. a transmission linear image sensor including a light receiver that illuminates the banknote surface; a light source that illuminates the banknote surface; a condenser lens that condenses light generated from the light source and reflected by the banknote surface; at least one set of reflective linear image sensors including a light receiver for detecting an image image; a means for recognizing the denomination and orientation of a banknote based on a signal from the transmissive IJ near image sensor;
) A means for recognizing defacement of banknotes based on a signal from an IJ near image sensor.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

In the same figure, a t-101. T-lens 102° fiber lens 103. A transmission type linear image sensor 1 having a line sensor 104 and a cross section, an L HD array ft, a source 2011, a focusing lens 202, and a fiber lens 203. The line sensor 204 is equipped with a reflective linear image sensor 2 for all the lines 1, and a reflective image sensor 2 for the banknote 4 (5).

In the transmission type linear image sensor 1, light is generated from a light source 101 and collected by a light source 102. The transmitted light is transmitted through the banknote 4, and the transmitted light is transferred to a line sensor 104 by a fiber lens 103 to form an image on the paper. An image is formed and the paper surface is optically scanned by the running of the bill, and the scanning result is continuously generated by the line sensor 104 as a scan signal.

Reflective linear image sensor 2. Similarly, in the case of 3 and 3, it is generated from yt, ω201 (301) and the condenser lens 2
02 (302) is reflected on the surface of the banknote 4, and the reflection source forms an image of the front (back) side of the banknote on the line sensor 204 (304) by the fiber lens 203 (303). , as the bill runs, it optically runs across the paper surface, and the quantitative signal becomes a scan signal and is continuously generated by the line sensor 204 (304).

By arranging reflective image sensors on both sides of a banknote as described above, dirt on the front and back sides of the banknote can be detected simultaneously.

The scan signals generated from the line sensor 104, 204.304 are sent to the multiplexer 501. Analog-to-digital converter 502. The image data is imported into the memo IJ 504 via the microprocessor 503, and based on this image data, it is determined whether the banknote is defaced.

Dirt on banknotes offends the person who holds the defaced banknote, but the surface of the banknote has portraits, designs, etc.
! There is a rough print pattern, and I don't really care about the dirt on the printed part. On the other hand, the transparent part has a white background and a large area, so
Dirt on the transparent parts is very noticeable and worrisome.

Therefore, here we will exemplify a method for detecting stains on the watermark section.

FIG. 2 is an explanatory diagram showing the relationship between the gold plate of a banknote, its orientation, a round hole-shaped watermark, and the position of the watermark. A transparent round hole 401 indicating the denomination is provided on the surface of the banknote, and this serves as an effective means for recognizing the orientation of the banknote. tal l Ibl I (like CI, round hole 40
When 1 is in the lower left corner, the table is erect, the same figure Idl, (
When it is in the upper right corner like IJ, ge), you can tell that it is a handstand on the clothes. Also, if there is one round hole, it will be a 1,000 yen bill (1,000 yen note), if two holes are lined up vertically, it will be a 5,000 yen note (5,000 yen note), if two holes are lined up horizontally, it will be a 10,000 yen note (10,000 yen note). ), the denomination and orientation of the banknote can be identified by the number and position of the round holes.

Since the round hole is transparent, the amount of light transmitted through the round hole is larger than that transmitted around the round hole. Therefore, by examining the part of the transmitted image data obtained from the output signal of the transmitted linear image sensor 1 and captured in the memo 'j-504, where the brightness is higher than the surrounding area, the position of the round hole and the security deposit can be determined. It is possible to identify, denomination, and direction.

In addition, the watermark 5402 is located slightly off center for 1,000 yen notes, at the edge of 5,000 yen notes, and approximately at the center for 10,000 yen notes, and the position of the watermark varies depending on the denomination. , Furthermore, even for the same denomination, for example, for a 1,000 yen note, the figure +a1. (al, (gr, (jr), the position and shape differ depending on the orientation.

Therefore, when checking for dirt on the watermark, the position of the watermark changes depending on the denomination and orientation, so identifying the denomination and orientation using the round hole described above is effective in setting the appropriate detection range. It becomes.

FIG. 3 is an explanatory diagram illustrating a method for determining dirt. Regarding the reflection image data obtained from the output signal of the reflection linear image sensor 2 or 3 and captured in the memory 504, the position of the watermark determined from the denomination and orientation obtained from the information on the number 9 positions of the round holes. , based on the shape, image data of only the watermark part is extracted from the reflection image data. This extraction can be achieved by preparing a mask pattern for each direction and applying a mask to the reflection image data.

Regarding the image data of the extracted transparent part, looking at 7F5 for its brightness and the number of data, it is found that the background color of the transparent part of banknotes is close to white, so the reflectance is high, and as shown in Figure 3 (bJ) If there is no dirt as shown in ■, the brightness distribution will be distributed throughout the prefecture in areas with high brightness (see ■ in Figure 3 (a)), but if dirt 6 adheres, the reflectance will decrease in that dirty area. The state of distribution is changing. In other words, the dirt is small in area but rough as shown in ■ in FIG. 3(b), and the dirt is pale but large in area as shown in ■.

Similarly, the state of the brightness distribution changes depending on the nature of the dirt, as in the case of dirt with a large surface area (see Figure 3 (a)).
(Refer to ■～■ in l).

Therefore, by comparing the reference luminance distribution pattern (2) in the case of no dirt stored in the memory 504 in advance with the luminance distribution pattern obtained from the image data, the microprocessor 503 can detect only the presence or absence of dirt. It is also possible to identify the nature of the stain.

In this article, we have explained the dirt on the watermark, but the same method can be applied to any other part, just the extraction of the detection target part is different. It is sufficient to prepare a mask pattern for any part to be detected. However, it is also necessary to prepare a reference brightness distribution pattern for the detection target portion.

〔Effect of the invention〕

As explained above, according to the present invention, the number and position t' of round hole-shaped watermarks are identified from the image data obtained from the output of a transmission image sensor, the denomination type and direction are recognized, and the denomination and direction are recognized. By extracting the image data of the watermark from the image data obtained from the output of the type image sensor and comparing the brightness distribution with the brightness distribution of a clean bill, it is possible to detect a soiled banknote and dispense the soiled banknote. It has the effect of preventing this.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the relationship between the denomination and orientation of banknotes, round hole-shaped watermarks, and the position of the watermarks, and Fig. 3 is a dirt determination method. FIG. 1... Transmissive linear image sensor, 2.3... Reflective linear image sensor, 4... Banknote, 5...
Recognition processing section, 6...Dirty. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Scope of Claims] A light source that illuminates the banknote surface, a condenser lens that condenses light generated from the light source and transmitted through the banknote, and a light receiver that detects the image obtained by the condenser lens. a transmission-type linear image sensor including: a light source that illuminates the banknote surface; a condenser lens that condenses light generated from the light source and reflected by the banknote surface; and an image obtained by the condenser lens. at least one set of reflective linear image sensors including a light receiver for detection; means for recognizing the denomination and orientation of banknotes based on signals from the transmissive linear image sensor; A soiled banknote detection device comprising: means for recognizing soiled banknotes.