SU985801A1 - Graphic data reading device - Google Patents

Description

The invention relates to automation and computer technology and can be used as a means of reading graphic information from a microfilm in information and information retrieval systems for entering it into a digital computer, ⁵ for transmission to a display device or to a copy obtaining device.

A device for reading graphic information containing a clock pulse generator, a memory unit connected to a line forming counter connected to a channel X switching unit and to a frame forming counter connected to a channel U switching unit ₁₅ , beam deflection units along X and Y coordinates, a cathode ray tube, a search control trigger connected to a first AND element, a first OR element, a second go OR element, connected to a tracking trigger, a delay element, a raster formation trigger, a counter Lejeune, comparing unit, and trigger the formation rast- pa is connected to the switching unit channels X and Y, and a delay element connected to the counter C1 of forming rows J.

The device organizes the search mode of a graphic image line by organizing a grid raster, and then reads ^ information by line segments. The length of the cut is determined by the tracking time. First, the segment of the first line found by the search scan is read, then the segment of the second, third, and so on, until the search scan again enters the first line. Then the second line segment is read, and part of the points of the second segment belonging to the first segment is read a second time. The reading process ends at the end of the search engine. It turns out that the search scan twice passes each point in the frame, and due to the overlap of the segments, the same image line is repeatedly read. Next g

985801 4 surely, only twice as much time is spent on organizing a search scan than reading a frame on a conventional television scan [1]. 5

The main disadvantage of this device is the long reading time of the entire cedar of information and redundancy of information.

Closest to the proposed technical essence is a device for reading graphic information containing the first element And connected to a clock generator | pulses and with the first trigger connected to the first OR element, the second OR element connected to the first delay element, the second delay element, the second trigger connected to the switch, a memory unit connected to the line counter connected to the beam deflection unit along the X coordinate and with a frame counter connected to the beam deflection unit at the Y coordinate, form-? ₅ signal switcher connected to a CRT, a third OR element connected to a third trigger, a clock counter connected to a fourth OR element,. a pulse selector and a fifth OR element, the line counter being connected to the switch.

In this device, scanning of the read frame is carried out by television scan. At the same time, every ³⁵ video signal corresponding to the output of the beam at the point of graphic information records the states of the line and frame counters in the memory block. and extinguishes the beam. Then beam ⁴⁰ is output in co sedan raster point on the scanning direction, returns to the read position and illuminates. If there is a first video signal that occurs issuing recorded in the memory unit ⁴⁵ co- ordinates on the output device. If there is no video signal, then the canceled beam is output to another neighboring point (against the direction of scanning), returns to the read position, and ^{50 is} highlighted. If a second video signal appears, then coordinates are output from the memory block. If the video signal is not present, the read coordinate points are not issued, and the device continues to ther frame ⁵⁵ long-range scan. The device finishes reading when the line count and cedar counters t2] are full.

A disadvantage of the known device • is its low speed, which is manifested in the fact that the television scan does not allow you to get the contours of the image before the reading of the entire frame ends. Therefore, it takes a lot of time to get the image configuration.

Nel invention - improving the performance of the device.

This goal is achieved by the fact that the known device containing the first trigger, the inputs of which are connected to the first OR element connected to the pulse selector, and to the first delay element, and the output is connected to one input of the first element · AND, the other input of which is connected to the generator, ru clock pulses, and with the formative *. Signal box, the output of which is connected to one input of the cathode ray tube, the other inputs of which are connected to the beam deflection units, the second OR element, one input of which is the input of the device, and the output is connected to the first and second delay elements, the first switch connected to the outputs of the first element And the second trigger and to one of the inputs of the second and third switches, the other inputs of which are connected to the third trigger, and the outputs are connected to one of the inputs. line and frame counters, respectively, the other inputs of which are connected to the second delay element and to the clock counter, and the outputs are connected to the memory unit у. to the corresponding beam deflection units, the third OR element, one input of which is the input of the device, and the output is connected to a clock counter, the first comparison unit connected to the line counter and to the input of the fourth OR element, the output of which is connected to the input of the second trigger, and the fifth element OR, one input of which is the input of the device, and the output is connected to a clock counter, contains a second comparison unit, the inputs of which are connected to the first trigger, with a line and frame counter, and the output is connected to a pulse selector, to the input retego trigger and to the inputs of the fourth and fifth element or inverter is connected with the frame counter and the first comparator, and a logic unit ban, whose inputs are connected to the selector pulse and the counter lines and frames, and outputs connected to other

9858 (inputs of the second and third elements OR.

In this case, the inhibit logic block contains the second AND element connected in series, the inputs of which are 5 inputs of the block, and the output is connected to one input of the third AND element, the other input of which is the input of the block, and the output of the third AND element is the output of the block, the element is NOT and fourth to the AND element, the other input of which is the input of the block, and the output is the output of the block. .

On Fig_1 presents a block diagram of a device; in FIG. 2 - specific constructive execution of the prohibition logic block; in FIG. 3 and 4 explain the operation of the device.

The device comprises a clock generator 1, a first element 20 'OR 2, a first element AND 3, a first trigger 4, a second element OR 5, a first switch 6, a second trigger 7, a first delay element 8, a second delay element 9, and a second switch. 25 10, third switch 11, third trigger 12, counter 13 clocks, counter 14 lines, counter 15 frames, third element OR 16, logic block 17 prohibition, first block 18 comparison, inverter 19, 30 second block 20 comparison, selector 21 pulses , the fourth and fifth elements OR 22 and 23, the unit 24 of the beam deflection along the coordinate X, the shaper 25 signals, the unit 26 of the beam deflection according to the coordinate _{35 on the} U, memory unit 27, CRT 28, the first, second "third inputs of the device 29-30 and exit 32.

The logical block 17 of the ban contains the elements And 33 and 34, the element is NOT 35 ₄₀ and the element And 36.

The device operates as follows.

The enable signal that appears at the input 30 of the device sets ₄₅ flip-flops 7 and 12 to the state 'O', and after passing through the OR element 23 it is recorded in the counter 13 clock cycles. As a result, at the output of counter 13, a code of the number one appears (O ... 001). At the same time, the pulse enters through the OR element 5 to the delay elements 8 and 9 and, passing the delay element 9, writes the contents of the counter 13 to the counters 14 and 15 of the lines and frames. . In this case, the highest order of the counter 13 enters the lowest order of the counters 14 and 15, and so on, and the lowest is the high order of the counters 14 and 15. As a result of writing> 1 6, the code is written in the counters 14 and 15

100 .. jO (unit in high order). The delay on element 9 is necessary so that writing to the counters 14 and 15 is carried out after the pulse is counted by the counter 13. Code

100 .. .0 from the outputs of the counters 14 and 15 enters the blocks 24 and 26 and determines the deflecting current of the CRT 28, equal to half the maximum current (maximum current corresponds to the code 111 ... 1).

Since at the initial moment the trigger is in the 'O' state, then at the output of the signal shaper 25 connected to the CRT modulator 28, there is a potential that extinguishes the beam (closing the modulator). Therefore, the canceled beam, in accordance with the code 100 ... O, goes to point A (Fig. 3), located on the diagonal of the raster reading the frame. The switching pulse, having passed the delay element 8, sets the trigger 4 in the state '1'. As a result of this, the shaper 25 removes the potential blocking beam of the CRT 28 and the beam is illuminated, and the element 3 receives permission to pass the pulses of the generator 1 to the coordinate switch 6. The delay on element 8 is necessary so that the CRT beam 28 has time to reach the point on the screen specified by the codes of the counters 14 and 15 before it lights up. Since the triggers 7 and 12 are in the 'O' state, the switch 6 is connected to the switch 11, and the switches 10 and 11 are connected to the subtracting inputs (-) of the counters 14 and 15. Therefore, the first pulse that appears at the output of the And 3 element comes through the switches 6 and 11 at the (-) input of the counter 15 and reduces its contents by one. As a result, the code Oil ... 1 appears at the output of counter 15 and the beam shifts to point B, (Fig. 3), and since the contents of counter 14 have not changed, then | the output of the inverter 19 sets the code 100 ... About.

Therefore, at the output of block 18 ', a pulse appears that passes through the OR element 22 and, having arrived at the counting input of trigger 7, sets it to state' 1 '. As a result, the switch 6 is connected to the switch 10, and the second pulse from the output of the And 3 element, through the switches 6 and 10, enters the (-) input of the counter 14 and reduces its content by one. As a result, the beam moves to point B

985801 8 (Fig. 3), and at the output of the counter 14 set * code O11 ... 1 is set. Since the contents of counters 14 and 15 turn out to be equal, and trigger 4 is in state, a pulse appears at the output of comparison unit 20, which enters the counting input of trigger 12, into the pulse selector and through the OR element 22 to the counting input of trigger 7, and through an OR gate 23 - a counter 13. in the results ¹⁰ Tate trigger 12 is set to '1 * and switches ko ^ mutators 10 and 11 to a summing input (+) of counters 14 and 15 and a trigger 7 moves to state D and . switch 6 again \ ⁵ connects to switch 11. On b> the course of counter 13 is set code O ... 010. The next impulse from the output of AND 3 element passes through switches 6 and 11 to the (+) input of counter 15 and has increased ”- ²⁰ reads its contents by one. Therefore, the code 100 ... O is set at the output of the counter 15 and the beam moves to the point Г (Fig. 3), and the code 011 ... 1 at the output of the inverter _2J . Therefore, at the output of the comparison unit 18, a pulse appears that, through the OR element, sets trigger 7 to the state '1', thereby switching the switch to switch 10. A new pulse from ^J I of the output of generator 1 passes through element 3, switches 6 and 10 on (+) counter input 14 lines and increases its contents by one. As a result of _3J , the code 100 ... 0 is set at the output of counter 14 and the beam returns to point A (Fig. 3), and a second pulse appears at the output of block 20, which returns triggers 7 and 12 to the state ₄₀ '0' ( both were in the state of '1'), sets the code O ... 011 in the counter 13 (via the OR element 23) and enters the input of the pulse selector 21. The selector 21, of the two pulses received in it, ₄₅ selects the second pulse; which passes through OR element 2 and sets trigger 4 to state 'O'. As a result of this, the beam is extinguished, and a zero potential enters the block 2Q of the comparison, which prohibits the selection of a pulse. Thus, the beam scanned by the square, starting from the point located in the center of the diagonal (A) and determined by the code 1000./.0 ^{1 of the} counters 14 and 15.

Thus CRT beam 28 moves vna- ⁵⁵ Chal Y-coordinate to point symmetric in the direction Y, the scan start point (FIG. 3B). At this point (B), it changes the coordinate of movement and begins to advance along the X coordinate to the point (C) symmetrical, in the X direction, the point at which the scan coordinate changed. Similarly, the CRT beam 28 again moves along the coordinate, then along the X coordinate, returning to the start point of the scan by pulses coming from blocks 18 and 20, respectively, and the scanning direction determines the state of trigger 7. If trigger 7 is in the 'O' state, then the beam moves along the coordinate Y, and if in the state * 1 ', then along the coordinate X. The pulse from the output of the selector 21 goes to block 17 too, and since the counters 14 and 15 are not completely filled, it passes through it to the OR element 5 and, as previously shown, overwrites the contents of counter 13 in s counters 14 and 15. At the outputs of the counters 14 and 15, the code 110 ... O is set and the beam moves to a new point (D) located on the diagonal of the frame being read. Since trigger 4 is in the state 'O', then after the beam goes to a new point of the beginning of the square motion, despite the fact that the same numbers are recorded in both counters 14 and 15, there will be no pulse at the output of block 20.

The above-described process of moving the CRT beam 28 in a square and moving to a new scanning start point, located on the diagonal and determined by the code of counters 14 and 15, is repeated until the counters 14 and 15 are completely filled.

In FIG. 3 points D, E, G, 3, D mark the path of the beam along the second square. The scan start points are sequentially determined by counter codes 14 and 15: 110 ... 0, 1010 ... 0, 1110 ... 0, etc. In other words, the next code for the start point of the scan is obtained by increasing the LLP code ... About the counters 14 and 15 by the number two, starting with the highest order, then the code 110 ... O, etc. In FIG. 3 scanning start points are points A, D, I, K, L, Μ, H, O. An increase in the code of counters 14 and 15 by two is achieved, as previously described, by increasing the contents of counter 13 by two, when the beam moves along squared and appropriately organized by writing the contents of counter 13 to the counters 14 and 15. When ί filling the counters 14 and 15, the beam of the EDT 28 moves to the extreme point (O) '985801 · _ 10 of the diagonal of the frame being read, since the pulse is equal. This pulse passes the code 111 ... 1 determines the maximum through, the delay element to the coincidence circuit - the current deviation. At the end of the square scan, the beam returns to the point (O) of the beginning of the movement, and as it were shown earlier, a pulse appears at the output of the selector 21, which sets trigger 4 to the state 'O', closing the And 3 element to pass the clock pulses of the generator 1. The same 10 pulse arrives in block 17, which prohibits the passage of the pulse to the delay element 5, but allows its passage to the OR element 16. Thus, the counter 13 is reset, and the trigger 15 ger 4 in the state '1' is not raised and the frame reading process ends . If during scanning along any of the squares the CRT beam 28 goes to a point or line of graphic information 20, then a video signal appears at the output 31 of the device, which transcribes the contents of the counters 14 and 15 to block 27. From block 27, the coordinates of the read out information points are output to output 32 25 according to the signals coming from the devices of consumers of graphic information.

The device can stop the reading process at any moment of time when an off- ₃ q signal is received at input 29, which sets trigger 4 to '0' through OR 2, and 13 clock counts through OR 16.

Block 17 operates as follows.

If the counters 14 and 15 are completely ₃₅ empty; then no signals of filling are received at the And 33 element and, therefore, there will be no signal at the output of And 33, but at the output of the element there is NOT a high potential. They have a pulse of ₄₀ coming from selector 21 to the AND 34 and 36 elements, but since the And potential is zero on the And 34 element, it only passes through the And element and goes to the OR element 5. If ₄₅ , the counters 14 and 15 are completely full , then at the output of the And 33 element, a high potential appears, which will open the And 34 element, and through the element

NOT 35 will close the AND element 36. Therefore, the ₅₀ pulse from the selector 21 passes only through the And 34 element and enters the OR element 16.

Block 20 operates as follows.

If the codes of the counters 14 and ⁵⁵ 15 are equal, the high potential appears at the output of the comparison circuit, according to which the pulse shaper generates a message, the second input of which is connected to the output of trigger 4. If trigger 4 is in the state '1', then the matching circuit is open and the pulse equality passes to the output of block 20. If the tripper 4 is in the state 'O', then there will be no pulse at the output of block 20.

Thus, the use of scanning by squares of various sizes (due to the strong correlation between the image points) allows you to get the contours of the image much faster than with a television scan. This follows (Fig. 4) from the fact that the proposed scan allows you to view the area of the entire frame.

Claims (2)

1. USSR author's certificate ML 541184, cl. O 06 K 11/00, 1975. 2. USSR author's certificate for application number 2883038 / 18-24, Cl, G, 06 K 11 / OO. ffn7 f ff / n c em y / fff f ff / TT cf e / 77ff / 7ff / I  f e / yf / / 77y "f f1 / gg fug.