The reader images of securities

 

(57) Abstract:

The invention relates to a control device authentication securities (notes), their deterioration and contamination, image analysis banknotes in different parts of the spectrum for sorting banknotes for automatic sorting machines. The technical result is to increase the accuracy of control of banknotes while simplifying digital processing. The reader images of securities containing site transportation of banknotes, lighting unit, creating a uniform illumination of the banknote in the control zone, the receiving device (video camera), blocks conversion of signals (BPS) and the computing unit (IU) for signal processing and comparison with reference data, the receiving device is performed by splitting the light flux after the lens through the semitransparent mirror so that the same images are simultaneously projected onto the same cell of photometric, the lighting unit may be performed on fluorescent lamps for lighting controlled zone on the banknote in the visible part of the spectrum and rows (lines) infrared emitting diodes. 1 C.p. f-crystals, 2 Il.

The invention otnorot in different parts of the spectrum for sorting banknotes for automatic sorting machines.

Known monitoring device banknotes [1], containing site transportation of banknotes, the illuminator, creating a uniform illumination of the banknote in the control zone, the lens and two or more linear photometric, on which is projected the image of the monitoring area of the banknote. Photometric are in the image planes are parallel to each other and in front of each of them are set filters on a specific part of the spectrum, such as visible and infrared. The number of elements (cells) in the line of photometric determines the resolution, which reads the image across the banknote, and the field of view defined by the size of photometric and parameters of the optical system, covers the width of the banknote. If the bill is moving with velocity V, and the sample of all N cells of photometric equal to t, then the distance between the lines in the read image on the banknote is s = Vt, which determines the resolution and the scale of the image along the banknote. Obviously, to obtain an undistorted image of the banknote need to either stabilize the speed of movement of the banknote, or just to monitor and recalculate the scale of the image. In addition, in the known device fotometricheskii of photometric require additional recalculation of coordinates with a reasonably accurate account of the speed of movement of the banknote, as in the authenticity control of securities necessary to analyze images of the same areas in different parts of the spectrum, i.e. to compare the data obtained with different photometric. In this device the speed of movement of the banknote and the reading speed (periods survey of photometric) is not synchronized, so the precise combination of images with different photometric causes considerable difficulties, since it is necessary to take into account many parameters: the speed of movement of the banknote, the distance between photometrically, the magnification optics, etc. Should also be noted that this device can be used illuminators of different designs, creating uniform lighting of the controlled area of the sheet, but these lights do not provide shadowless lighting. Such lighting is necessary for control of crumpled banknotes, when directed radiation creates shadows from surface roughness, which leads to image distortion and ultimately to the deterioration of the inspection results.

Objectives of the invention are: a) improve the accuracy of control of banknotes while simplifying digital image processing by creating a reader images, in which the one hundred (in the direction of motion) do not depend on the speed controlled banknote; b) increasing the reliability of control creased and old banknotes by creating a uniform shadow-free lighting in the controlled area of the banknote.

This is accomplished as follows. The reader images of banknotes contains site transportation of banknotes, the illuminator designed to create a uniform illumination of the banknote in the area of its control, the receiving device containing a lens, at least two linear of photometric facing a set of optical filters with the transmission of the luminous flux in different spectral regions, blocks conversion of signals (BPS) and the computing device (WS) designed for signal processing and comparison with reference data. In contrast to the known device site transportation of banknotes supplemented by a sensor monitoring the movement of banknotes, the receiving device is configured to split the light flux after the lens through the semitransparent mirror so that the same image of the banknote simultaneously projected onto the same cell of photometric, signals from which are used to convert them into digital signals in blocks conversion of signals in the device introduction them in the specified computing device, signal inputs of buffer devices are connected to the outputs of the blocks conversion of signals, their gate inputs connected with the output of the specified sensor, and outputs associated with the specified computing device. In addition, the illuminator may include a fluorescent lamp for lighting control zones in the visible spectrum and infrared light emitting diodes (IRD), which are arranged on both sides of the control zone and intended to create a uniform and shadow-free lighting control zones.

Independent of the speed of movement of the banknote combining images with different photometric is achieved by the fact that the luminous flux after the lens is divided through the semitransparent mirror into two streams, each of which is routed through the appropriate filter for your photometric. Photometric and mirror are mounted so that the image on photometric match, that is, each element of the image falls on the same cell number in both photometric. In this design you can easily increase the level of the optical filter by mirror with different coefficients of reflection and transmission for different parts of the spectrum. For example, in the inventive device, the ratio propuskanie the CLASS="ptx2">

Independent of the speed scale of the image along the banknote obtained as follows. In the device introduces an additional displacement sensor of the banknote, such as pulse (incremental) sensor ID associated with the belt transportation of banknotes. The number of pulses per revolution are chosen so that for the period between two pulses of the banknote has passed a certain distance s. Read the images from each of photometric (survey of all cells in the linear photometric) is performed with a period t. With the observed condition: t< between pulses row fetching the contents of the BFU is updated. This ensures a stable and uniform scanning an image of the banknote when changing the speed of its movement to a considerable extent.

The described device is manufactured and tested in action at the sorting machines of the type BARS, developed and manufactured at the company "data CENTER" in Yekaterinburg).

Literature

1. PCT application WO 96/36021, G 07 D 7/00.

1. The reader of banknote images containing site transportation of banknotes, the illuminator designed to create a uniform illumination of the banknote in the area of its control, the receiving device s with the transmission of the luminous flux in different spectral regions, blocks conversion of signals and computing device for processing and comparison with reference data, wherein the node of the transport of banknotes supplemented by a sensor monitoring the movement of banknotes, the receiving device is configured to split the light flux after the lens through the semitransparent mirror so that the same image of the banknote simultaneously projected onto the same cell line photometric, signals from which are used to convert them into digital signals in blocks conversion of signals in the device entered the buffer for intermediate storage of the above digital signals and transmit them to the specified computing device, signal inputs of buffer devices are connected to the outputs of the blocks conversion of signals, their gate inputs connected with the output of the specified sensor, and outputs associated with the specified computing device.

2. The device according to p. 1, wherein the illuminator includes a fluorescent lamp for lighting control zones in the visible spectrum and infrared emitting diodes, which are arranged on both sides of the control zone and dedicated to superior quality products

 

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