Paper currency number recognition apparatus and recognition method
First Claim
1. A paper currency number recognition device, comprising:
- a contact sensor configured to acquire paper currency image data by way of transmission imaging;
a white light LED transmission light source board arranged right in front of the contact sensor to provide the contact sensor with a transmission light source for use in collecting the paper currency image data;
an image collection processing plate connected to the contact sensor through a data cable, wherein a Field Programmable Gate Array and a digital signal processor are integrated on the image collection processing plate, the Field Programmable Gate Array is configured to control the white light LED transmission light source board to be on or off and drive a CIS to acquire images, and the digital signal processor is configured to process and recognize the paper currency image data; and
two pairs of position sensors arranged on a paper currency transport pathway at a position with a predetermined distance from the contact sensor and configured to detect whether there is a paper currency entering the paper currency number recognition device;
wherein the white light LED transmission light source board has a strong light mode and a weak light mode, and the two light modes alternately provides the contact sensor with the transmission light source for use in collecting the paper currency image data, andwherein, after the Field Programmable Gate Array completes collection of a row of image data, the Field Programmable Gate Array informs the digital signal processor in a manner of an interruption of acquiring data, and the digital signal processor enters an interrupt service routine and detects an image type register to determine a type of the row of image data.
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Accused Products
Abstract
A paper currency number recognition apparatus and method. The apparatus comprises: a contact-type sensor (10) for acquiring paper currency image data; a white-light LED transmission light source board (20); an image acquisition processing board (40) which is integrated with an FPGA and a DSP, the FPGA being used for controlling ON/OFF of the white-light LED transmission light source board (20) and driving the contact-type sensor (10) to acquire an image, and the DSP being used for processing and recognizing the paper currency image data; and two pairs of position sensors (30) for detecting whether there is a paper currency entering the paper currency number recognition apparatus, wherein the white-light LED transmission light source board (20) has two light source modes which are strong and weak, and the two light source modes alternately provide a transmission light source for the contact-type sensor (10) to acquire the paper currency image data. The apparatus can acquire two white-light transmission images with different brightness of one and the same paper currency each time; therefore, the numbers of both new and old paper currencies can be effectively recognized, and the accuracy rate of paper currency number recognition is improved.
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Citations
7 Claims
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1. A paper currency number recognition device, comprising:
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a contact sensor configured to acquire paper currency image data by way of transmission imaging; a white light LED transmission light source board arranged right in front of the contact sensor to provide the contact sensor with a transmission light source for use in collecting the paper currency image data; an image collection processing plate connected to the contact sensor through a data cable, wherein a Field Programmable Gate Array and a digital signal processor are integrated on the image collection processing plate, the Field Programmable Gate Array is configured to control the white light LED transmission light source board to be on or off and drive a CIS to acquire images, and the digital signal processor is configured to process and recognize the paper currency image data; and two pairs of position sensors arranged on a paper currency transport pathway at a position with a predetermined distance from the contact sensor and configured to detect whether there is a paper currency entering the paper currency number recognition device; wherein the white light LED transmission light source board has a strong light mode and a weak light mode, and the two light modes alternately provides the contact sensor with the transmission light source for use in collecting the paper currency image data, and wherein, after the Field Programmable Gate Array completes collection of a row of image data, the Field Programmable Gate Array informs the digital signal processor in a manner of an interruption of acquiring data, and the digital signal processor enters an interrupt service routine and detects an image type register to determine a type of the row of image data. - View Dependent Claims (2, 3, 4)
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5. A paper currency number recognition method, comprising:
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step 1 comprising acquiring strong light image data and weak light image data of a paper currency by way of transmission imaging in the case that a transmission light source irradiates alternately in a strong light mode and in a weak light mode; step 2 comprising performing an edge detection on the weak light image data to acquire four edges of an image to determine a target image; step 3 comprising processing the target image to recognize a version, a nominal value, an orientation of the paper currency and determine an area where the paper currency number is located; step 4 comprising calling a pattern recognition algorithm, comparing a gray value of the paper currency image with a threshold value by using a pattern recognition method based on artificial neural networks to recognize that the paper currency is new or old, and using the strong light image data for recognition in the case of an old paper currency, or selecting the weak light image data for recognition in the case of a new paper currency; and step 5 comprising outputting a recognition result of the paper currency number, wherein, after the Field Programmable Gate Array completes collection of a row of image data, the Field Programmable Gate Array informs the digital signal processor in a manner of an interruption of acquiring data, and the digital signal processor enters an interrupt service routine and detects an image type register to determine a type of the row of image data. - View Dependent Claims (6, 7)
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Specification