SU1259303A1 - Device for reading graphic information - Google Patents

Abstract

The invention relates to the field of automation and computing. in particular, to devices for reading graphic information for its further processing on a computer. .. The purpose of the invention is to improve the accuracy of the device. This goal is achieved by positioning the plate guides at an angle of 60 °. one to the other, which reduces the number of movements of the coordinate remover by half compared with the known devices, and the transition from the use of elementary squares of the reading grid to elementary triangles of the grid. 2 Il. IsD SL CO with

Description

one

The invention relates to automation and computing, in particular to devices for reading graphic information.

The purpose of the invention is to improve the accuracy of the device,

FIG. 1 is a block diagram of the device; in fig. 2 is an example of a constructive implementation of a coordinate remover.

The device contains the first 1, second 2 and third 3 signal conditioners, trigger group 4 and 5, trigger 6, first 7, second 8 and third 9 elements AND, first 10 and second 11 elements OR, group of elements AND 12 and 13, first 14 , second 15 and third 16 reversible counters, memory block 17, made in the form of ROM, decoder 18, first 19, second 20 and third 21 delay elements, tablet 22 with guides and 23 coordinate remover, which includes stepper motors 24 and 25 and sensor 26 signals. FIG. 1 also shows the input 27 and the outputs 28 and 29 of the device.

The device works as follows.

A contour is placed on the plate 22, and a sensor 26 is positioned on its side so that when it moves horizontally, it crosses the contour line in any number of steps. A start signal is then applied to the input. Shaper 2 sets triggers to one

4 and 6 and to the zero state trigger

5 and reversible counter 16.

From the reversible counter 16, the number of the initial motion vector is fed to the address input of the ROM 17 and the corresponding code of the motion vector is fed to the decoder 18. This same signal passes through the OR element 11, the delay element 20 and goes to the control input of the decoder 18,. which generates the appropriate control command for the stepper motors 23 and 24. This causes the sensor 26 to move to the right step. Chain: trigger 6, element AND 9, elements OR 10 and 11, elements 19 and 20 of the delay initiate cyclic release of Start signals. The operation cycle described is repeated until the sensor 26 intersects the contour line until.

ten

259303

The intersection of the contour line sensor 26 leads to the impulse 1 being generated by the shaper, which sets a trigger 4 into O and switches the trigger 5 via the counting input. The trigger 4 allows the signals -1 or +1 to pass through elements 12 and 13 to the reversible counter 16 and through element 7 output to the output 28 of the circuit information in the form of a sequence of zeros and ones: O - white color, 1 - black.

Since at the initial moment trigger 5 was in the state of laundry, switching it to the black state allows the pulse from the sensor 26 to pass through the OR 10 element and the AND 13 element to the -1 input of the reversing counter 16, the Counter value becomes 101. delayed by the delay element 19, through the element IL 10 and the element And 13 subtracts -1 more from the contents of the reversing counter 16, and its value becomes 100, Thus, when the color changes from white to black

15

20

25

the sensor's motion vector is rotated by +120. If after this step the color under the sensor does not change (i.e. driver 1 does not generate a pulse), in the next step only one unit is subtracted, and the sensor's direction vector is still rotated +60. Similarly, the motion vector is rotated when going from black to white, but in the opposite direction.

The completion of the encoding of a given contour is determined by the arrival of sensor 26 in the vicinity of the contour point from which its crawl began. The peculiarity of this point is that the sum of the command codes, filed for each stepping motor, when traversing the circuit, taking into account the sign, is: zero. To determine this fact

the zero outputs of the reversible counters 14 and 15 are connected to the element AND 8 and at the moment of the first intersection of the contour line through the imaging unit 3 they are set to O. Once their values are set, the sheaf

are equal to O, the Start signal, delayed by delay elements 20 and 21, through the IW element resets to O

trigger 6, which leads to output 28 of the Stop signal.

Claims (1)

Invention Formula A graphic information reader, containing a tablet with guides for moving the coordinate remover, whose inputs are connected to the decoder outputs, and the output is connected to the input of the first signal conditioner, the second signal conditioner, the input of which is an input of the device, and the output are connected to the same trigger inputs groups, the other inputs of which are connected to the outputs of the first signal conditioner, the third signal generator, whose input is connected to the output of one group trigger, and the output is connected to The first element OR, one input of which is connected to the output of the first signal conditioner and the first delay element, the second delay element, the output of which is connected to the third delay element, the first element And, the inputs of which are connected to the corresponding outputs of the group triggers and the second delay element, and the output is first S 0 five In order to increase accuracy, it contains a group of elements I, whose inputs are connected to the corresponding outputs of the group triggers and the first element SH, a third reversible counter, the inputs of which are connected to the outputs of the elements of the group I and the second shaper of signals, block a memory, the input of which is connected to the output of the third reversible counter, and the output is connected to one input of the decoder, the other input of which is connected to the second delay element, the second element I, whose inputs are connected to The outputs of the first and second reversible counters and the third delay element, and the output is the second output of the device, and the series-connected trigger, whose inputs are connected to the outputs of the second signal conditioner and the second And element, the third And element, the other input of which is connected to the first delay element, and the second SHS element, the other input of which is connected to the output of the second signal conditioner, and the output is connected to the first and second delay elements, while the plate guides are located relatively e and another 60 °. under by the corner Editor N. Yatsola FIG. 2 Compiled by A.Romanov Tehred M.Hodanich Order 5125/49 Circulation 67t Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d, 4/3 Production and printing company, Uzhgorod, Projecto st., 4 Proofreader O.Lugov