SU1298782A1 - Device for recognizing digits - Google Patents

Abstract

The invention relates to the field of automation and computer technology and is intended for input and recognition of typed and handwritten numbers in mail sorting systems. The aim of the invention is to improve the accuracy of the device due to the adaptive control of the thresholds of the individual strokes of the digit image. The device contains a matrix of photodetectors, a multiplexer, a fixed memory, the first and second pulse counters, a pulse generator, threshold elements, reversible pulse counters, a decoder, and a WL-HE element. 2 Il. S to; oo oo to

Description

The invention relates to the field of automation and computer technology, in particular, to devices for recognizing information entered into a computer, and can be used to enter and recognize printed and handwritten numbers in automated accounting systems, mail sorting systems, automated control systems, and automated training systems.

The purpose of the invention is to improve the accuracy of the device due to the adaptive control of the thresholds of perception of individual strokes of the digit image.

Fig. 1 shows a functional diagram of a device for recognizing digits, Fig. 2 shows a matrix of photodetectors and a scheme for distributing interstitial space. The device contains a matrix of 1 photodetectors, a multiplexer 2, a permanent memory 3, the first 4 and second 5 pulse counters, a pulse generator 6, a threshold element 7, a generator start input 8, a reverse pulse counters 9, a group of threshold elements 10, three-input elements And 11 , two-input element And 12, -decoder 13, element OR-NOT 14, outputs 15 of the device.

Elements 1-5 form a block for reading images of digits, elements 6 and 7 are a control unit, elements 9-11 are a unit for forming features, a decoder 13 is a decision unit.

The operation of the read, characterization and control units is as follows.

When starting the pulse generator using input 8, the first and second counters 4 and 5 are reset to the zero state. The counting input of the counter 5 is connected to the output of the generator 6 pulse

and the counting input of counter 4 is connected to the overflow output of counter 5. The overflow output of counter 4 is connected to the counter stop input of counter 5. In this way, the first counter is a vertical counter, and the second counter is horizontal-50 only in that case if the corresponding scan of the photodetector matrix 1. The output of the pulse generator is connected to the synchronization inputs of the reverse pulse counters 9 pulses, the counting inputs of which are connected to the outputs of the constant 55 memory 3, and the counting inputs of the counting output 12. And signal the output output of the photodetector mattress 1 is associated with the threshold element 7, and its information outputs, formed by the outputs of all the photocells, are connected to the inputs of the multiplexer 2. The photodetector matrix 1 contains the photodetectors 16 (Fig. 2), each of which is associated with one or several strokes of a stylized image of a digit in accordance with, for example, the scheme shown in FIG. Designations, for example Г1, indicate the type of stroke (vertical - В, horizontal - Г and oblique - Н) and its number.

Information about the belonging of each photodetector to the strokes of a stylized image is stored in the permanent memory 3. So, for a photodetector,. found in the second row of matrix 1 in second place (shaded) in memory 3 is written code

В1 В2 ВЗ В4 Г1 Г2 ГЗ HI Н2

0100100 00 A photodetector, denoted by A, is connected to the signal output of the matrix of receiver receivers.

The device works as follows.

Before starting work, the information about the distribution of photodetectors of the matrix 1 across the strokes of the stylized representation of numbers is stored in memory 3, and the decoder 13 is configured to convert a set of highlighted strokes of a digit into a digit code.

According to the start-up signal supplied to input 8, counters 4 and 5 reset to zero, a generator of 6 pulses is started and the sequence of addresses of each of the photodetectors is removed from the outputs of the counters as the latter operates. The address received at the input of the permanent memory 3 causes reading from the outputs of the last code, the units in which indicate the strokes that enter the field of this photodetector, and the reading of the specified code is made

The associated photodetector generates a signal that passes through the multiplexer 2 that is open at the moment of its address supply to the enabling input of memory 3.

The code read in this way goes to the counting inputs of counters 9 zeroed in the initial position, on which as the generator 6 operates

3

The number of pulsed photodetectors accumulates pulses relative to the corresponding strokes.

Upon completion of the survey of all photodetectors of the matrix 1, on each counter 9 a code of the number of excited photoreceivers of the matrix 1 in the area of the stylized image is fixed. If the specified number is greater than a certain threshold, then a single signal is generated at the output of the corresponding threshold element TO, which passes through the open element 11. At the output of the elements 11, a code is thus formed, the unit values of the bits of which correspond to the occurrence of the corresponding stroke in the pattern

character.

If the specified code corresponds to one of the input codes of the decoder 13, then the corresponding output code of the digit is read to the outputs 15 and through the element OR NOT 14 prohibits further work on digit recognition. Otherwise, the outputs 15 generate zero-level signals that are converted to a single-level signal at the output of the element IL OR NOT 14. This signal, having passed through the open signal 4 of the counter 4 and element 12, is fed to the counting inputs of all counters 9 (corresponds to an increase in the thresholds of the elements 10 ), whose code is reduced by one, and the decoder 13 is again polled.

Sov, the zero-state inputs of which are connected to the trigger input of the pulse generator, the overflow output and the counting input of the second pulse counter are connected respectively to the counting stop input and the overflow output of the first pulse counter, the counting output of which is connected to the output of the pulse generator, multiplexer, and information inputs which are connected to the information outputs of the photodetector array, and the control inputs are connected to the outputs of the first and second pulse counters, the memory is constantly the read resolution of which is connected to the multiplexer output, and the address inputs are connected to the outputs of the first and second pulse counters, reverse pulse counters, whose counting direct counting inputs are connected to the outputs of the permanent memory, and the synchronization inputs are connected to the output of the pulse generator, a group of threshold elements whose inputs are connected to the outputs of reversible pulse counters, and the outputs of threshold elements are connected to the first inputs of the three-input elements And, the two-input element And, one input which This is connected to the output of the OR-NOT element and the second inputs of the three-input elements AND; the other input is connected to the output. The above process of adapting the thresholds for highlighting the strokes of the stylized image will continue until

until the second counter is found, the impulse stylized representation of the races is found, and the output is connected to the inputs by recognizing the digit.

The device, thus, by the pulse-wave, the threshold element, the input to the learning with the known, allows the substance to be connected to the control module, to increase the reliability of the detector of the photodetector matrix, and the output of the stylized digits is especially connected to the third inputs - in the case of their handwriting. dovy elements I.

four

The formula and the 3rd one are the Digital Number Recognition Device, which contains a matrix of photodetectors, a decoder, the inputs of which are connected to the outputs of the three-input elements AND, and the outputs are connected to the inputs of the element OR NOT and are outputs of the device differing from By the fact that, in order to improve the accuracy, a pulse generator was introduced into the device, the first and second pulse counters

Sov, the zero-state inputs of which are connected to the trigger input of the pulse generator, the overflow output and the counting input of the second pulse counter are connected respectively to the counting stop input and the overflow output of the first pulse counter, the counting output of which is connected to the output of the pulse generator, multiplexer, and information inputs which are connected to the information outputs of the photodetector array, and the control inputs are connected to the outputs of the first and second pulse counters, the memory is constantly the read resolution of which is connected to the multiplexer output, and the address inputs are connected to the outputs of the first and second pulse counters, reversible counters of pulses, the counting direct counting inputs of which are connected to the outputs of the permanent memory, and the synchronization inputs are connected to the output of the pulse generator, the group threshold elements whose inputs are connected to the outputs of reversible pulse counters, and the outputs of the threshold elements are connected with the first inputs of the three-input elements And, the two-input element And, one input of which connected to the output of the OR-NOT element and the second inputs of the three-input AND elements, another input is connected to the overflow output of the second pulse counter, and the output is connected to the reverse account inputs of the reversible counters

phage. 7

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FIG. 2

Editor V. Daiko

Compiled by A. Krasnov

Tehred I.Popovich Proofreader A.T.

Order 892/53 Circulation 673 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Claim. A device for recognizing numbers, containing a matrix of photodetectors, a decoder, the inputs of which are connected to the outputs of the three-input elements AND, and the outputs are connected to the inputs of the element OR-NOT and are the outputs of the device, characterized in that, in order to improve accuracy, a pulse generator is introduced into the device, the first and second pulse counters, the inputs of the zero state of which are connected to the start input of the pulse generator, the overflow output and the counting input of the second pulse counter are connected respectively to the input the counting output and the overflow output of the first pulse counter, the counting output of which is connected to the output of the pulse generator, a multiplexer, the information inputs of which are connected to the information outputs of the photodetector array, and the control inputs are connected to the outputs of the first and second pulse counters, read-only memory, whose read permission input is connected with the output of the multiplexer, and the address inputs are connected to the outputs of the first and second pulse counters, reversible pulse counters, counting inputs of the direct frequency the one of which are connected to the outputs of the permanent memory, and the synchronization inputs are connected to the output of the pulse generator, a group of threshold elements, the inputs of which are connected to the outputs of the reversible pulse counters, and the outputs of the threshold elements are connected to the first inputs of the three-input elements And, the two-input element And, one input of which is connected with the output of the OR-NOT element and the second inputs of the three-input AND elements, the other input is connected to the overflow output of the second pulse counter, and the output is connected to the countdown inputs pulse counters, a threshold element whose input is connected to the control output of the photodetector array, and the output is connected to the third inputs of three-input elements I. FIG. 2