SU1552207A1 - Device for control of reading graphical information - Google Patents

Abstract

The invention relates to automation, in particular, to a device for reading graphic information and can be used in solving the problem of automatically entering graphic information into a computer. The purpose of the invention is to improve the accuracy of the device. The goal is achieved by re-outputting a CRT beam to reading a raster image element and comparing video signals, which is ensured by introducing additional delay elements, a digital-to-analog converter, and OR and I. elements Il.

Description

The invention relates to automation and computer technology and can be used in information and computer systems, in computer aided design and control systems as means of reading graphic information for inputting it into a computer, transmitting it to a display device or a storage system.

The aim of the invention is to improve the accuracy of the device.

The drawing shows a block diagram of the device.

The device includes a sweep generation unit 1 consisting of an element OR 2, a trigger 3, a first 4 and a second 5 elements AND, a counter of 6 lines, a counter of 7 frames and a generator of 8 pulses, the first delay element 9, the switching unit 10, the second delay element 11 , second element OR 12, block 13 of digital-to-analog converters, block 14 of scanning, containing shaper 15 of signals,

beam deflection unit 16 in Y coordinate, cathode ray tube (CRT) 17, deflection system 18, beam X deflection unit 19, damping trigger 20 and delay element 21, first register 22, first element OR 23, driver 24 clocking pulses, consisting of a distributor of 25 pulses, a first 26, a second 27 and a third 28 flip-flops and a delay element 29, a third delay element 30, a second register 31, the first element 32, the first 33, the second 34 and the third 35 control inputs of the device, the first 36 and second 37 information outputs of the device, the first 38 and the second 39 elements And, the switch 40, the second 41 and the third 42 elements And, the digital-to-analog converter 43, the first 44 and the second 45 digital-to-analog converters.

The device works as follows.

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ate

N) K D)

one

The turn-on signal, introduced at the device input 33, sets the trigger 3 of the block 1 to state 1. The first pulse from the generator 8 of the block 1 through the element 4 is fed to the input of the distributor 25 of the driver 24. The pulse from the first output of the distributor 25 sets to 1 27, which by its output permits the passage of pulses through the first element 38 of block 10. The first pulse from element 4 of block 1 through delay element 9 and element 38 of block 10 is fed to the counting input of a counter of 6 lines. The output codes of the row counters 6 and frame 7 are converted by block 13 into analog signals, and through block 19 of the beam deflection

along the X coordinate, the beam deflection unit 16, along the Y coordinate and the deflecting system 18, deflects the beam and changes its position on the screen of the CRT 17 by one step along the OX axis. The impulse from the generator 8 of the block 1 through the element AND 4 and the element OR 23 sets the trigger -20 of the block 14 to one state. As a result, the CRT beam 17 is quenched through the shaper 15. The pulse from the OR element 23 through the delay element 21 is set to O

trigger 20 for blocking of scanning unit 14. The beam is again illuminated. In this way, the beam is extinguished during transients in the device during the passage of signals. The incrementing codes from the outputs of counters 6 and 7 of block 1 are fed to the information inputs of register 22.

If there is a video signal at the input 35 of the device equal to a single value, it enters through the AND 32 element to the control input of the storage register 22 and records the contents of counters 6 and 7 to the register 22 without outputting the values of the sneakers of the X and Y coordinates to the device output 36 , moreover, before recording the codes, the installation was made in O register 22. In parallel, the video signal from the device input 35 is fed to the information input of the register 31, and the first equalizing input from the AND 4 element of block 1 is recorded

la into register 31. The contents of register 5 to the third one, deflects the beam 31 in each cycle and shifts to the right ELT 17 by one step down along the axis

one bit of the signal from the element 29 delay shaper

OU, illumination and blanking of a CRT 17, recording and shifting the video signal from the device input 35 in register 31.

24 clocking signals.

0

five

0

five

The second pulse from element 4 of block 1 is fed to the input of the distributor 25 pulses of the driver 24, the second output of which generates a signal that the trigger 27 of the driver 24 is set to O and prevents the passage of pulses from the delay element 9 through the element 38 of the block 10 switching, as well as a pulse from the second output of the distributor 25 sets in 1 trigger 26, which allows the passage of pulses through the element And 39.

The second impulse of the AND 4 block 1 through the delay element 9, the AND 39 element, the switch 40 and the OR element 12 enters the counting input of the 7 frame counter and increases its content by one, which leads through blocks 13, 16 and 19 and the deflecting system 18 block 14 to the upward deviation of the beam by one sampling along the axis of the op-amp, and through the corresponding elements, the CRT 17 of block 14 is quenched and illuminated. The video signal from the device input 35 is recorded in the register 31 and shifted by one bit to the right, as in the first cycle .

The third pulse from the generator 8 of block 1 through element 4 is fed to the input of the distributor 25 pulses of the former 24. From the third output of the last signal sets to 1 flip-flop 28, which controls the switch 40 of the block 10. The third pulse from element 4 through element 9 delay element And 39 and the switch 40 of the block 10 is fed to the second input of the counter 7 frames and reduces the contents of the counter by one. The output signal from counter 7 through a digital-to-analog converter 45, a beam deflection unit 16 along the Y coordinate and a deflecting system 18 of the scanning unit 14 45, the CRT beam 17 is deflected down one step along the axis of the op-amp. Through the OR element 23, the delay element 21, the trigger 20 and the signal conditioner 15, the CRT beam 17 is quenched and illuminated. If there is a video signal at the device input 35, it is recorded in the register 31 and shifted by one bit to the right.

Fourth pulse similar

0

40

50

5 to the third, produces deflection of the beam of the CRT 17 one step down along the axis

OU, illumination and blanking of a CRT 17, recording and shifting the video signal from the device input 35 in register 31.

The fifth pulse from the generator 8 of the block 1 through the element 4 is fed to the input of the distributor 25 of the driver 24, from the fifth output of which the signal sets the trigger 28 to 0. The pulse from the element 4 through the delay element 9, element 39, switch 4 of the block 10 and the element OR 12 enters the first input of the 7 frame counter and increases its content by one. For codes from row counters 6 and frames 7 through block 13, blocks 16 and 19 of the beam deflection and the deflecting system 18, the CRT beam 17 deviates upward by one step along the SU axis. As in the previous clock cycles, the blanking and illumination of the CRT beam 17, recording the video signal and shifting the contents of the register 31 to the right by one bit of the signal from the delay element 29 of the block 24 are performed.

The signal from the fifth output of the distributor 25 through the delay element 30 is fed to the first input of the And 41 element and outputs the contents of the register 31 to the input of the And 42 element and the digital-to-analog converter 43 with the setting in О of the register 31.

When the single values of the video signals coincide in the first and third cycles at the output of the And 42 element, a control signal is generated, which, through the And 41 element, impulses the delay element 30 to output the contents of the storage register 22 to the device output 36 with the storage register set to 0, and An analog video signal from a digital-to-analog converter 43 is output to the device output 37 and can be used for recording in video-magnetic information and computing complexes. The signal from the delay element 30 is set in the O distributor 25 pulses and the trigger 26 of the driver 24 clock pulses.

The next pulse from generator 8 begins the formation of the next image sweep cycle, which

52207

ten

output element And 5 sets in O the counters of lines 6 and frames 7 and through the delay element 11 and the element OR 12 is entered 1 into the counter 7 frames, and the device stops reading until the signal arrives at the control input 33 of the device. A device for controlling the reading of graphic information may stop reading at any time by a signal from the input 33 of the device.

Claims (1)

Invention Formula 0 A device for controlling the reading of graphic information containing a scanner forming unit, the control inputs of which are the first and second control inputs of the device, the information outputs are connected to the inputs of the digital-analog converter unit and to the information inputs of the first register whose output is the information output of the device , the first delay element, the input of which is connected to the first control output of the scanner forming unit, the second and third control outputs of which are connected here, to the first and second inputs of the first OR element, the third input of which is connected to the first control output of the scanner shaping unit, and the output to the sync input 5, the switching unit, the information input of which is connected to the output of the first delay element, and the control inputs are connected to the corresponding outputs of the clock pulse generator, the first control output of the mutation block} is connected to the third control input of the scanner shaping unit, the first element I , the first input of which is connected to the first control output of the scanner shaping unit, the second input is the third control input of the device, and the output is connected to the setup input of the first p hisgist5 0 0 repeats until the second register, the second register, the information will go overflow of the counters whose inputs are connected to the outputs 6 and frames 7. Overflow signals of the clock clock pulse driver, From counters 6 and 7 are fed to the inputs of the second element And 5, from the output of which the signal sets to O through the element OR 2 trigger 3 of block 1, which prohibits the passage of pulses from the generator 8 through the element 4 of block 1. Simultaneously the signal from The installation input is with the third control input of the device, and the reset input is with the first control output of the scanning shaping unit, characterized in that, in order to improve the accuracy of the device, it contains the second and third elements