SU642734A1 - Arrangement for measuring image geometrical parameters - Google Patents

Description

one

The invention is in the field of automation and computer technology and can be used to determine the geometrical parameters of images, in particular, to measure the coordinates of the center of gravity of an optical image in systems for transmitting and processing visual information.

Devices are known for determining the geometrical parameters of the images 1, 2, which allow determining the area, static moments and other parameters of the image and containing X and Y coordinate measurement units, pulse generators, triggers, logic elements, keys and delay elements.

The disadvantages of the known devices are low reliability and accuracy of determining the geometrical parameters of images.

The closest in technical essence to the presumed device is the well-known device 3, which contains an amplitude quantizer, a clock pulse generator connected to the trigger input, X and Y coordinate measurement blocks, the outputs of which connect the HeiUii through the keys with the corresponding outputs.

devices, switches, distributors and delay elements.

A disadvantage of the known device is low accuracy.

The circuit invented is the precision of device operation.

This goal is achieved in the proposed device by the fact that it contains upper and lower 1 forming units {its image edges, the block is defined 1 "center of the image body, the block for determining gyirins from one side and successively, combined with half the area of the image and block you are one of the inputs of which are connected to the output of the first switch, and the output to the input of the delay element 1 {connected to the control input of one of the keys, and to the first inputs of the first distributor, the form edge BepxHetx) of the image, ok and measuring the coordinate Y and the second switch, the second input of which, the first input of the second distributor and the second inputs of the upper edge image forming unit and the coordinate measuring unit Y, connected to the device sync input, the output of the amplitude quantizer is connected to the third input of the upper edge forming unit, the second the input of the second distributor and the first inputs of the unit for forming the lower edge of the image and the unit for determining the center of the body of the image, the outputs of which are connected respectively to the first inputs of the image definition block, the image definition block of half image area and, through the third distributor, to the second input of the image half definition block, the output of which is connected to the first input of the first com ... switch, the second input of which and the third input of the second switch are connected to the corresponding outputs the first distributor, the other output of which is connected to the third input of the unit for determining the coordinate Y, the fourth input of which, the second input of the unit for determining the half area of the Agen second and third input connected to the output distribute block forming the lower edge of the image; the outputs of the clock generator and the trigger are connected respectively to the clock inputs of the formation blocks of the upper and lower edges of the image, the measurement unit of the X coordinate, the first distributor, the image center of the image weight center and the half area of the image, the output of which is connected to the second input of the first distributor determining the image center of gravity is connected to the fourth input of the block forming the upper edge of the image, the second inputs of the block forming the lower edge of expressions and determining the width of the image and the first input of the measurement coordinates X, the second input of which is connected to the output of the second distributor. The block diagram of the device shown in the drawing. It contains amplitude quantizer 1, block 2 of forming the upper edge of the image, block 3 forming the lower edge of the image, distributor 4, block 5 determining the center of the image gravity of the image, generator 6 clock Il tulses, block 7 measuring the X coordinate, block 8 determining the width of the image, block 9 measuring the Y coordinate, block 10 determining half-area of the image, distributor I, block 12 of subtraction, valve 13, trigger 14, switch 15, delay element 16, first key 17, switch 18, second key 19, and block 20 of subtraction. The device works as follows. The analyzed signal, after decomposing the image in rows of a frame, is applied to the amplitude quantizer I, from which video pulses containing information of each line of the image of the object are removed. From the output of the amplitude quantizer 1, the video pulses are fed to the unit 2 for forming the upper edge of the image, the unit 3 for forming the bottom image edge, the distributor 4 and the unit 5 for measuring the center. Prior to the arrival of pulses from the amplitude quantizer 1 at the input of block 2, it counts the pulses arriving at its input from the generator 6 clock pulses, in the interval between the horizontal sync pulses (FID). If there is no image on this line of the TV raster, then Block 2 is zeroed by the incoming FID. This process continues until the signal from the image of the object taken from amplitude quantizer 1 appears on the TV raster line. When pulses arrive from amplitude quantizer 1 at the input of unit 2, the FID at its input is turned off. Unit 2 counts the pulses from the generator 6 clock pulses before the center impulses are taken from the center measuring unit 5, which disconnects the generator 6. In block 2, the number corresponding to the center of the video impulse taken from the amplitude quantizer 1 on the given line of the television raster will be written. This fixes the center of the top edge of the image. The video pulses of the following lines of the TV raster decomposition, taken from the amplitude quantizer 1, give permission to control the FID distributor 4. The distributor 4 controls the operation i of the measuring coordinate unit 7 of the X coordinate, in which the time points of the video pulses are fixed and each row of the image decomposition begins the second and the last line, which still has a signal from the image of the object. The center is fixed on each line of the image by control pulses taken from the center definition unit 5, which measures the centers of the video pulses, beginning at. first and ending the last line of the image decomposition of the object. Information about the position of the center on each line of the decomposition of the image of the object is stored by the measuring unit 7 of the X coordinate in digital form until the next reading. At the same time, the pulses taken from the center definition unit 5, control the operation of the bottom edge forming unit 3 and the image 8 definition unit 8. Block 3 is a controlled cumulative counter. The pulses from the amplitude quantizer 1 prohibit, and the pulses of the image center determining unit 5 allow the counting of pulses from the generator of 6 clock pulses. Ply

fixing the bottom edge of the image, the pulses with the subsequent decomposition line of the TV raster will not have a signal from the image of the object. Cumulative counter in the bottom image forming unit

3 will overflow and will issue a control signal to the unit 9 measuring the coordinate Y, the distributor

4 and block. determine the half area of the image 10.

The coordinate measurement unit 9 Y counts the number of expansion lines from the first rows of the raster up to the line corresponding to the bottom edge of the image, plus one row. When applying to the control pulse block from block 3, block 9 measuring the coordinate Y remembers the coordinate that corresponds to the line number that does not contain the video pulse following the bottom edge of the image contour. To determine the true coordinates of the center of gravity and to increase the measurement accuracy, weighting of the video signal is used, which is as follows. After the end of the video impulse of each line containing information about the image of the object, control pulses are removed from the image center definition unit 5 and fed to the distributor 11. Pulses 11 are measured from the distributor 11, controlling the operation of the image width measuring block 8, which measures the signal width of each video signal decomposition line of the television raster and remembers it. Moreover, the number of pulses recorded in block 8 measuring the width of the image f is equal to half the number of quantization pulses from amplitude quantizer 1 on each line of the raster, respectively. This is done in order to determine the accuracy of determining the coordinates of the center of gravity of the projected object to the plane and reduce the equipment. For the same purpose, the quantization pulses from the center definition unit of image 5 are fed to the input of the half area image definition unit 10. In the half image area determination unit 10, the number of quantization pulses equal to half the image area on all raster lines containing the image is recorded. When a control pulse from the block 3 is supplied to the input 10, half the area information from block 10 is rewritten into subtraction unit 12. Once the information from block 10 is copied to subtraction unit 12, unit 10 draws a pulse of controllers to the output of distributor 13, the output which control pulses are taken with the output frequency of the trigger 14 and are fed to the input of the switch 15. At this moment, through the switch 15, information about the width of the object on each

Claims (3)

1. USSR author's certificate N «38828 i cl. G 06 K N / 00,1968. 2. USSR author's certificate number 423095, ki. G06F 11/08, 1972. 3. The patent of Great Britain No. 1255653, kl.s4N, 1971.