SU1524074A1 - Device for reading-out images - Google Patents

Abstract

The invention relates to automation and computing and can be used in image reading and processing systems. The purpose of the invention is to simplify the device by introducing a block of analyzers of contour points, which allows an image to be analyzed using a sliding aperture of size 3 ^. 3 picture elements. 1 hp ff, 3 ill.

Description

The invention relates to computing and can be used to read images.

The purpose of the invention is to simplify the device.

In (Fig, 1) presents a diagram of the device; FIG. 2 is a diagram of a photodetector cell; FIG. 3 is a diagram of the contour points analyzer.

The device contains an image input unit 1, an optical shutter 2, a matrix photodetector 3, cells 4 of a matrix photodetector, a block 5 of analyzers of contour points, analyzers 6 of contour points, switch 7, block 8 of memory, start block 9, pulse generator 10, key 11, the first 12 and second 13 delay elements, the first 14 and second 15 counters

The analyzer 6 coitour points contains the first 16, second 17 and third 18 triggers, the element AND 19, the element 20,

The cells of the matrix photodetector 3 contain the photosensitive element 21 and the fourth trigger 22.

The device works as follows.

When the Start signal arrives, the block 9 generates a rectangular pulse that arrives at the control input of the optical shutter 2, which, under the influence of this pulse, opens and the light flux of the image generated by the image input unit 1 passes to the matrix photodetector 3. Under the action of light, the photosensitive elements 21 cells

I

produce electrical signals

that arrive at the installation inputs of the flip-flops 22 and set

them in a single state. As a result, the image is fixed in the photodetector 3, the triggering pulse from the output of block 9, the passage of the isoA

sh

|

The delay element 12 is delayed by the time the image is captured by the photoreceiver 3 and is fed to the first control input of the key 11, as a result of which the clock pulses produced by the generator 10 are fed to the inputs of the clock pulses of the matrix photoreceiver 3 and the analyzer block 5 to the input element 13 delays and counting inputs of counters 14 and 15 Clock pulses also arrive at the synchronization inputs of the flip-flops of 22 cells AO. A parallel shift occurs in the image recorded in the photoreceiver 3 in the direction of the first Troki due to the fact that the data input latch of each cell is connected to a direct output of flip-flop predschuschey cells, and each column of the photodetector 3 is a synchronous shift register

At the same time, clock pulses arrive at the clock input of the analyzer block 5, to the synchronization inputs of the triggers 16-18, which in each analyzer 6 form the continuation of the shift register of the corresponding column. Consequently, each successive cycle in the analyzer 5 contour points contains three consecutive image lines , and in triggers 16-18 of each analyzer, 6 contour points contain the states of three consecutive cells of the corresponding column

Triggers 16 - 18 of three consecutive analyzers of block 5 form an aperture of 3x3 elements of the image

Neither due to connections between neighboring analyzers 6, the state of the analysis of each analyzer receives signals of the state of all cells in the vicinity of a 3x3 image cell.

the state of which is recorded in the trigger 17 of this analyzer. In this case, U each analyzer checks the belonging of the central element of the aperture to the contour by calculating the AND-NOT 19 element and the AND 20 element of the logical function F

where x

- the central element of the aperture 3x3, - the elements of its neighborhood. The Accessories Contour function takes the value 1 only when the central element of the aperture belongs to the image and among neighboring

Q 5 0

5 o

five

0

0

five

there are at least one element with it, paBtibrfi is zero, m e when the central element is contour. The operation of each contour point anapizer is synchronized by pulses at the third input of element 20, which are the clock pulses delayed by element 13 by the calculation time of the function FO On arrival at the control input of the block 5 of the analyzers of the delayed clock pulse, the signals of the function F are generated at the outputs of its analyzers 6, the output of the J analyzer of the analyzer 6 is a signal of a logical unit if the central element of the aperture analyzed in this cycle is the contour

Simultaneously with the shift of the image in photodetection 3 and analysis of its elements, the counters 14 and 15 pulses count the clock pulses that arrive at their counting inputs from the output of the key 11 o. At the output of the counter 14 in each clock there is a number of this clock equal to the number of the line being analyzed matrix photodetector Zo The output code of the counter 14 is fed to the information input of the switch 7, the control inputs of which are connected to the corresponding outputs of the analyzers 6 contour points When appearing at the output of the j-ro analyzer 6 contour points of a voltage pulse of a logical unit (this is the case if the corresponding element to be analyzed is contour), which goes to the corresponding control input of the switch 7, the j-output of the switch connects with its information input, resulting in j The output of the switch appears in the switch output. The line containing the contour element C of the switch output J-ro arrives at the corresponding information input of the memory block 8 and is written to it by the back of ontu delayed clock pulse which is supplied to the delay element 13 to the control input of the memory unit 8 thio latter has a sectional structure and comprises one section in each column of the photodetector 3, so that the contour elements are contained in a column, are latched in the respective section

Thus, in a parallel-sequential reading process, the image in memory block 8 records an array of image contour points, the X coordinate (column number) is the section number in which the point is fixed, and the Y coordinate (line number) is written by in correspondent to cell 1 of the memory block section

Claims (1)

The image reading cycle is formed by a pulse counter 15, which counts the clock pulses during the read process. During the read process, the output of the counter 15 has zero voltage, and when the clock pulse arrives corresponding to the analysis of the last row of the matrix, its output appears the voltage of the logical unit that is supplied to the second control input of the key 11, as a result of which the key 11 closes and closes the clock, stopping the 1.11 read process itself. The signal from the output of the counter 15 also goes to the installation input of the counter 14 and sets it to the initial state, as well as to the second control input of the starting unit 9 and prepares it for the next cycle. If the matrix photodetector 3 contains M rows, the conversion factor of the counter 15 is equal to M + 1, since it requires one additional clock cycle for the analysis of a dummy zero line at the very beginning of the read cycle. Invention Formula the first delay element, the output of which is connected to the first control input of the key, which is connected to the counting inputs of the first and second counters, the input of the second delay element, the output of the second counter connected to the installation input of the first counter, to the second control input of the key and to the second control the input of the start-up block, characterized in that, in order to simplify the device, it contains a block of analyzers contour points, the information inputs of which are connected to the outputs of the matrix photodetector, the input Reset is connected with input Device reset, the clock input is connected to the key output, the control input is connected to the output of the second delay element, and the output is connected to the control input of the switch, the control input of the memory unit is connected to the output of the second delay element, the clock input of the matrix photodetector is connected to the output key. 2a The device according to claim 1, of which is that each analyzer of contour points contains three flip-flops, an AND-NO element and an AND element whose output is the analyzer's output, the first input of the AND element is connected to the output of the AND- element -NOT, the second with the output of the second trigger, and the third is the control input of the analyzer, the input of the first trigger is the information input of the analyzer, the clock input of the first trigger is the clock input 1 o Device for combining the image of the analyzer, clocking inputs of recesses, containing an image input unit, optically connected with the optical shutter and information input of the photodetector array, switch, information input of which is connected to the output of the first counter, and output with information input of the memory block ti, the output of which is the output of the device, the setup input of the photodetector arrays is the input Reset of the device, the pulse generator, the output of which is connected to the information input of the key, the trigger unit, first control input of which flip-flops and a third input coupled to a timing analyzer reset input of the first flip-flop is reset input of the analyzer, 45 inputs Reset second and third triggers are connected to the Reset input of the analyzer, the outputs of the first and third triggers are connected to the first and second inputs of the NAND element, third 50 the fourth and fifth inputs of the analyzer's I-ro element are connected to the first, second, and third triggers of the (i-l) -ro analyzer, and the sixth seventh and eighth inputs of the element the device’s start-up device; the 55 ° analyzer is connected to and the output is connected to the control input of the optical shutter and to the input of the third and third triggers are connected to the clock input of the analyzer, the Reset input of the first trigger is the Reset input of the analyzer, inputs Reset second and third the triggers are connected to the input of the Reset analyzer, the outputs of the first and third triggers are connected to the first and second inputs of the NAND element, the third, The fourth and fifth inputs of the INE i-ro element of the analyzer are connected to the outputs of the first, second, and third triggers of the (i-l) -ro analyzer, and the sixth, seventh, and eighth inputs of the element the outputs of the first, second and third triggers (i + l) -ro of the analyzer. } FIG I