SU1236520A1 - Method of reading graphic information - Google Patents

Abstract

The invention relates to automation and computing and can be used in information and computer systems for automation of design work. The purpose of the invention is to improve the accuracy and speed of the method of reading graphic information. A device that implements the proposed method includes a clock generating unit, a switching unit, a sampling frequency control unit, an OR element, a line counter, a frame counter, first and second registers, a comparison unit with variable threshold voltage, a memory unit, a blanking unit , the units of the beam deflection by coordinates) C and Y, the block of discrete subfocusing, the cathode ray tube and the storage scheme. According to the proposed method, a step-varying scanning voltage of the image field is generated, the scanning voltage of the point light signals is excited at the sampling frequency, and they are converted at the moments when the video signal hits the image, they form threshold voltages that are compared with the video signal, and when a video signal is smaller than the threshold voltage level, two-step pulses with a ‑ fold increase in their frequency, where n is 2.4, 16, with a period equal to them are doubled second duration sequentially summed two-stage pulse with an amplitude of l stepwise varying voltage scanning point ive video comparing the amplitude with a threshold voltage is judged on the read coordinate point of the image. 1 il. Yu SO

Description

The invention relates to automation and computing technology and can be used in information and sensitization systems to automate design and research and development, as well as enter information into EG.M or transfer to a display device.

The purpose of the invention is to increase accuracy and speed.

The drawing shows the block diagram of the device that implements the proposed method.

The device contains a clock generating pulses unit 1, a switching unit 2, a sampling frequency control unit 3, an OR 4 element, a 5 line counter, a 6 frame counter, a 7 line counter, 8 frame counter, the first 9 and 10 second registers, a block 11 comparing w variable threshold voltage, memory unit 12, quencher unit 13, beam deflecting unit 14 in Y coordinate, beam deflecting unit 15 in X coordinate, discretely focusing unit 16, cathode ray tube (CRT) 17, and storage circuit 18. The diagram shows: the first 19 second 20 and third 21 inputs of the device, the first 22, second 23 and third 24 outputs of the device.

The device works as follows.

The turn-on signal, introduced at the first input 19 of the device, enters the switching unit 2, which permits the passage of signals from the first output of the clock generating pulses 1 to the input of a 7-line counter, sets to O through an OR 4 element of 5 lines and a 6-frame counter . In this case, the incrementing codes of the counter 7 rows and the frame counter 8 enter the beam deflection unit 15 along the X coordinate, the beam deflection unit 14 along the coordinate, and the beam changes its position on the CRT screen 17 by the value of the first raster element along the OX coordinate.

Thus, in block 14, the deflection of the beam along the coordinate H and the block 15 of the deflection of the beam along the coordinate produces the formation of stepwise variable scanning voltage of the image field with a low sampling rate. The pulse from the first output of the clock generating pulses 1 also goes to block 3

control the sampling frequency, from the first output of which a setting signal is generated in O of the memory unit, and the signal from the second output of control unit 3 arrives at the input of blanking unit 13, extinguishes the beam and illuminates the CRT beam 17.

In this way, the voltage at the sampling frequency of the voltage of the point light signals is transformed and converted into moments when the light signals on the image are in video signals.

If there is a video signal at the third input of the device 21, it enters the sampling frequency control unit 3, the memory unit 12 and the comparison unit 11 with the variable threshold voltage. Voltage amplitude

The 0 video signal from the third device input 21 is compared with the threshold voltage generated in comparison unit 11. When the amplitude of the voltage of the video signal at the third input 21

5 of the device, equal to a single value, the signal from the third output of the sampling rate control unit 3 records the contents of the first counter of 7 rows, the first counter of 8 frames and video signals into the memory unit 12. The signal from the first output of the comparison unit 11 with variable threshold voltage is fed to the fourth input of the sampling rate control unit 3, the signal from the fourth output of which outputs the contents of memory block 12 to the first output device 22 where the current values of the coordinates X, X and single value of the video signal. Zero values of the signals from the second output 23 of the device, and from the third output 24 of the device correspond to the output from the first output 22 of the X, Y coordinate device and the high-resolution video signal.

Thus, threshold voltages are formed, the voltage amplitude of the video signals is compared with the threshold voltages and the unit values of the voltage amplitude of the video signals are judged on the coordinates.

 The amplitude of the voltage of the video signals is compared with variable threshold voltages and with the amplitudes of the voltage of the video signals less than unity ({two, two-step pulses are generated with a two-fold increase

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the frequency of their following, with a period equal to their doubled duration in relation to the initial sampling frequency of the scanning voltage.

When the amplitude of the video signal voltage is less than one, the signals from the second output of the comparison unit 11 with variable threshold voltage and from the fifth output of the sampling rate control unit 3 are given a signal to permit the passage of signals from the second output of the pulse output 1 unit through switching unit 2 a ban on summing input account ik 5 lines. The increasing value of the X coordinate from the counter of 5 lines enters the beam deflection block 15 along the coordinate, those W., deflection of the beam on the CRT 1 7 along the OX axis with a smaller sampling.

In parallel, a pulse from the second output of the clock generating pulses 1 is fed to the second input of the sampling frequency control unit 3, from the eighth output of which a signal is input to the first input of the discrete subfocusing block 16. As a result, the beam diameter of the CRT 17 is halved. From the second output of the sampling rate control unit 3, a signal is generated, according to which the blanking unit 13 produces quenching and illumination of the EJ beam 17.

If there is a video signal at the third input 21 of the device, it enters the sampling rate control unit 3, the memory unit 12 and the comparison unit 1 with a variable threshold voltage. The amplitude of the video signal from the third input 21 of the device is compared with the second threshold voltages generated in comparison unit 11.

When the amplitude of the video signal voltage at the third input 21 of the device is equal to a single value, the signal from the third output of the sampling rate control unit 3 records the contents of the second counter 5 lines, the second counter 6 frames and the video signal into the memory block 12. The signal from the second output of the comparison unit 11 with variable threshold voltage is fed to the fifth input of the sampling frequency control unit 3, the signal from the fourth output of which produces the contents of the block 12

The data on the first output 22 of the device, in which the current values of the coordinates X, Y and a single value of the video signals are stored, and from the storage circuit 18 a single value is taken from the second output 23 of the device and a zero value is output from the third output 23 of the device the first output Q 22 of the device X, 2 and the video signal with a lower resolution.

In addition, when the value of the video signal shifts is 1 or O, the signal from the seventh output of block 3 2 controls the sampling frequency is switched by block 2; commutation with the prohibition of the second output of block 1 generating to the counting input of the counter, 6 frames, Q the second block 1 generating clock pulses through the block 2 switching with the ban enters the summing input of the counter 6 frames. Increasing the value of 5 counter codes of 6 frames causes the beam to be deflected down along the OV axis by one sampling, blanking and illumination of the CRT beam 17, the eighth output of the sampling rate control unit 3, through beam 16, the beam diameter is focused.

When the magnitude of the video signal voltage is 1 or O, the signal from the seventh output of control unit 3 switches the second output of generating unit 1 through switching unit 2 to the inputs of the counter 5 lines.

The third pulse from the second output of the power generating unit 1 of the clock pulses through the switching unit 2

arrives at the summing input of the counter 5 lines,

As a result, the beam on the CRT 17 deviates one raster element to the right along the axis OX, the beam diameter on the CRT 17 is sub-focused, the beam is quenched and illuminated,

When the voltage amplitude of the Bi signal is 1 or O, the signal 0 from the seventh output of control unit 3 is controlled by switching the second output of generating unit 1 to the subtracting input of the counter of 6 frames,

5, the fourth pulse from the second output of the generating unit 1 through the switching-over switching unit 2 is fed to the subtracting input of the counter 6 cad0

ditch Similarly, the CRT beam 17 is deflected along the OY axis upward by one raster element, subfocusing, magnification and illumination of the beam.

When the value of the amplitude of the video signal voltage is equal to 1 or 0, and four pulses from the second output of generating unit 1 are received at the second input of control unit 3

the installation is made in O of the elements of the control unit 3, the memory unit 12 and the storage circuit 18.

Thus, at voltage amplitudes of video signals smaller than single ones, two-step pulses form in four cycles with a twofold increase in their frequency with respect to the initial sampling frequency of the scanning voltage, excite them with a sampling frequency at points of the light signals and convert them to moments of impact. image to video signals, compare the amplitude of the voltage of the video signal with another threshold voltage and with the amplitudes of the voltage of video signals equal to a single, in the second qi le judged on kordi- nats.

If one of the four cycles of the second cycle has the amplitude of the video signal voltage at the third input 21 of the device, less than 1 and greater than 0, but not equal to one, the device in one of these cycles goes to the formation of two-step pulses with a fourfold increase in their frequency with a period of equal to their doubled duration, relative to the initial sampling frequency of the scanning voltage, their excitation with sampling rate at the points of the light signals and their conversion at the moments of hitting the image video signal comparison, comparing the amplitude of the video signal voltage with other threshold voltages and the amplitudes of the video signal voltages equal to a single value, are judged on the coordinates.

If in one of the four cycles of the second cycle, the amplitude of the voltage of the video signals is less than 1 or more O, the signal from the tenth output of the comparison block 11 goes to the first inputs of the first 9 and second 10 registers with a variable threshold voltage.

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and rewrites the contents of the counter 5 lines and the counter 6 frames to the first 9 and second 10 registers, respectively, the signal from the fifth output of control unit 3 leads to the prohibition of the passage of pulses from the second output of the clock generating pulse unit 1 and the resolution of the passage of pulses from the third output of block 1 generating through the switching unit 2 to the summing input of the counter 5 lines. The signal from the ninth output of the control unit 3 produces the focusing of the beam diameter, and from the second output, the blanking and illumination of the CRT beam 17.

If there is a video signal at the third input 21 of the device from the fifth output of the comparison unit 11, the second value of the signal is input and recorded to the second input 18 of the storage circuit 11, and if there are signals from the third output of the comparison unit 11 that arrives at the sixth input of the control unit 3, and signals from the third output of the generation unit 1 of clock pulses arriving at the artery input of the control unit 3, the seventh output of the control unit 3 generates a signal that switches the outputs of the switching unit 2 with commute to the summing input counter 6 frames.

The second clock pulse from the third output of the clock generating pulses unit 1 through the switching unit 2 is fed to the summing input of the counter of 6 frames. Similarly, as in the previous cycles, the beam diameter is focused, the beam deviates along the OY axis down by one raster element, the video signal is illuminated and read, the X, 5 coordinates and video signals are recorded in block 12, and then read from the block 12 memories.

The third pulse from the third output of the block. 1 of the generation of clock pulses deflects the beam of the CRT 17 to the right by one raster element, and the fourth pulse — upwards by one raster element. The beam diameter is focused, blanking and illumination of the CRT beam 17, analyzing the amplitude of the video signal at the third input 21 of the device, recording the coordinates / fj, and video signals in the memory block 12 in each clock cycle, issuing signals from the first output 22 of the device and from the third

course 24 devices. The output of the signal from the third device code 24 corresponds to the formation of the third scan signals. On the fourth clock pulse from the third output of the clock generating pulses unit 1, the control unit 3 extracts the rewriting signal of the contents of the first register 9 into the second counter 5 lines and the contents of the second register 10 into the second counter 6 frames, setting the elements in the blocks to the appropriate state and the device switches to read with greater discreteness.

The introduction of a new sequence of operations makes it possible to increase by 2–3 times the accuracy and speed of reading graphic information while reducing, respectively, the amount of discrete information transmitted to the communication channel with data storage and processing devices.

Claims (1)

Invention Formula The method of reading graphic information based on the formation 20 (Step-varying voltage - image field scanning, excitation with a sampling frequency of voltage scanning of point light signals, conversion, point light signals when they hit the image in video signals and forming threshold voltages, characterized in that increase accuracy and speed, compare the amplitude of the video signal with the corresponding threshold voltage and at video signal amplitudes lower than the threshold voltage level, two-step pulses are formed with a n-fold increase in their frequency with respect to the initial sampling frequency of the scanning voltage, where n-2.4, 16, with a period equal to twice the duration, Two-step pulses with an amplitude of step-varying scanning voltage are summed up and at the time of comparing the amplitude of a video signal with a threshold voltage, the coordinate of the read point of the image is judged.