SU1410074A1 - Device for measuring the inclination angle of a straight stretch of an object image outline - Google Patents

Abstract

The invention relates to automation, in particular, to devices for determining the angle of inclination of a straight linear contour segment of images of an object, and can be used to measure the characteristics of an I object by analyzing its image. The purpose of the invention is to improve the accuracy of the device when determining small angles of inclination of a straight line segment of the image of an object. The goal is achieved by scanning a column-window along the rows of an image frame as soon as the linear contour enters the zone of the central decomposition element of the column-window image, counts the number of steps-steps of the column-window along the rows until the projection of the straight line will not be equal to the specified value, after which the value of the vertical projection of the rectilinear contour segment is determined. By the ratio of the number of steps-steps of the column-window along the lines to the vertical projection, expressed in the number of image decomposition elements, the slope of the straight line of the object’s image contour is determined. 1 il. (L with

Description

h

ten

15

20

25

one . 1410074

The invention relates to an automaton, in particular, to a device for {determining the angle of inclination of a line. of the image of the object, and can be used to measure the characteristics of the object by analyzing its image.

The purpose of the invention is to increase the precision of the I.HOCTH device when determining small angles of inclination of a straight-line segment of the image of an object. The drawing shows a structural diagram of the proposed device. The device contains a video sensor 1, a binary quantizer 2, a generator of 3 clock pulses, a synchronizer 4, a block of 5 delay elements, a block of 6 I-NOT elements, D- triggers 7, an RS flip-flop 8, the first element I 9, a counter 10, block 11 determining the sign of the angle, block 12 determining the magnitude of the horizontal projection of the contour piece, the first element OR 13 and the decoder 14. The block 11 determining the sign of the angle contains the second and third elements OR 15 and 16 and the second and third elements And 17 and 18. The block 12 determine the magnitude of the horizontal projection of the contour segment contains a group of () elements OR 19 and a group of n elements AND 20.

The device works as follows

Video signal sensor 1 converts an optical image into an electric video signal, which is normalized by amplitude by binary quantizer 2 and fed to block 5 of delay elements. In a block of 5 delay elements, 2n decomposition elements of the image, located in a column, are allocated, and fed to block 6 of the K-HE elements. If there are signals of different amplitude levels on the input block B of the elements AND-NE, a pulse is generated at the corresponding element inverting AND, and the outputs are entered into the corresponding code D-flip-flop 7, to the clock input of which a pulse sequence with a clock frequency is generated in the generator 3 clock pulses. The outputs of the D-flip-flops 7 generate signals of the same level as on the corresponding input buses at the time of arrival of the previous clock pulse. When the contour gets into the central element of the decomposition with the level in the in and out of the top of the bottom and the bottom of the frame, 35 7 co lla ng 40 ny vi IL ng op 45 at the ny hloe ng me you are 7, and you are 20

thirty

50

55

0

five

0

five

074

2

The electronic window from the output of the p-th D-flip-flop signal has a high level signal to the S-input of the RS-flip-flop 8. After the arrival of a high-level signal to the S-input of the RS-flip-flop 8 (i.e. when the linear circuit hits the central The 5th element of the image decomposition of the column) from the last output to the first input of the element And 9 receives a signal, the opening element And 9, and the sequence of clock pulses applied to the second input of the element And 9 from the generator output 3 clock pulses begins to flow to the counting input of the counter 10. In the counter 10 p The clock pulse count is generated. With the arrival of 256-g: about a pulse from the counter of the counter 10, a high level signal goes to the control inputs of the angle sign decider 11 and the block 12 for determining the vertical projection of the contour piece (CWHMW) s The information inputs of these blocks receive signals from the D-trigger outputs 7. At the same time, a high level signal is present at one of the inputs of the OR elements 15 and 16 of the block 11 for determining the sign of the angle, corresponding to the position of the contour in one of the elements of the image decomposition. The inputs of the OR 15 element are connected to D-triggers 7-1, 7-2, ..., 5 7 (n-1), therefore, a high level signal at the output of the OR 15 element corresponds to a positive contour deflection angle. The inputs of the OR 16 element are connected to the B-triggers 0 7п, 7- (п + 1), ..., 7- (2п-1), and the high level signal at the output of the element OR 16 corresponds to the negative angle of contour deviation. Signals that determine the sign of the angle appear 5 at the output of the angle sign determining unit 11 when there is a high level signal at the control input of this unit 11. WILP 12 operates similarly to the angle sign determining unit 11. The differences are that the inputs j-ro (where j 1, ..., p-1) of the element OR group 19 are connected to the outputs j-ro and (2n-j) -ro of D-flip-flops 7, and output n th D flip-flop 7 is connected to the first input of the n-th element And group 20, therefore, on the left, the output of one of the elements And group 20 of the high level signal characterizes the distance of the end of the 0

0

five

314

round from the central element of decomposition and, therefore, characterizes the magnitude of the vertical projection of the contour. Signals from the output of CWINS 12 come when the control input of this block has a high level signal simultaneously to the information inputs of the decoder 14 and the inputs of the OR 13 element. If there is a high level signal on one of the inputs of the OR 13 output, its output appears read the information from the decoder 14, as well as coming to the inputs of the RS-flip-flop 8 and counter 10.

Thus, when a column-window is scanned along the rows of an image frame, as soon as the linear contour enters the zone of the central element of the image-column decomposition, a counter 10 is activated, which counts the number of clock-steps of the column-window along; lines until the projection of the straight-line segment is equal to the specified value (in this case, 256), after which the value of the vertical projection is output from block 12. From the ratio of the number of steps of the column-window steps along the lines to the vertical projection, expressed in the number of image decomposition elements, the slope angle of the straight line of the object contour in the image is identified.

The proposed device allows, by measuring the angle in the scanning process, to increase the measurement accuracy in comparison with the prototype (since the error with a row of 256 decomposition elements and a linear window capacity of 7 decomposition elements is about 6, while the prototype does not exceed 10) and improve the measurement performance (since there is no need to remember the initial information and does not require complex algorithms of preliminary calculations and storing intermediate information tion) to 0.02 s.

Claims (1)

Invention Formula A device for determining the angle of inclination of a straight-line segment of an image contour of an object, comprising 00744 video signal sensor, binary quantizer, clock generator, synchronizer, block of elements . delays, a decoder, a block of AND-NOT elements, (2n-1) D-flip-flops (where the number 2n determines the number of decomposition elements in a linear electronic window), an RS flip-flop, the first And element, Q counter, with the output of the video signal sensor connected to the input of the binary quantizer, the output of which is connected to the information input of the block of delay elements, first and second 5 synchronizer outputs are connected respectively to the first and second inputs of the video signal sensor and the first and second inputs of the clock generator, the output of which is connected to 0 clock input block delay elements, the second input of the first element And the clock inputs D-trig-. The generators, information inputs of each of which are connected to the corresponding outputs of the NAND element block, whose inputs are connected to the outputs of the block of delay elements, the output of the nth D flip-flop is connected to the information one, the RS trigger input, the output of which. Q is connected to the first input of the first ; And element, the output of the first element: And connected to the counting input of the counter, the group of outputs of the decoder is the group of outputs of the device, os o l and h aa, so that, in order to increase the accuracy of the device when determining small angles of inclination, a group of (n-1) elements 11Ш., a group of n elements 40 AND, three elements OR, second and third elements AND, the first input of the j-ro element of the VDI group (where j 1,2, ..., p-1) is connected to the output of the j-ro D-flip-flop, and the second input is connected to the exit 45 (2n-j) -ro D-flip-flop, olement outputs OR groups are connected to the first inputs of the corresponding AND elements of the group, the first input of the n-th element of the AND group is connected to the output of the n-th D-trigger, the second inputs of the second and third And elements and elements AND groups are connected to the output of the counter, the outputs of elements AND groups are connected to the corresponding inputs of the first element OR and the corresponding information inputs of the decoder, the output of the third element OR is connected to the control input of the depotrator and the RS-Trig installation inputs Editor A.Lezhnina Compiled by V. Makarenkov Tehred A. Kravchuk Proofreader / L. Patay Order 3483/47 Circulation 704 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Subscription