SU702545A1

SU702545A1 - Device for measuring the length of middle axis of an object

Info

Publication number: SU702545A1
Application number: SU782568540A
Authority: SU
Inventors: Виктор Семенович Вихман; Алексей Алексеевич Абакумов; Леора Шакировна Гайнуллина
Original assignee: Уфимский Нефтяной Институт; Московский автомеханический институт
Priority date: 1978-01-13
Filing date: 1978-01-13
Publication date: 1979-12-05

Description

(54) УСТРОЙСТВО ДЛЯ ИЗМЕРЕНИЯ ДЛИНЫ СРЕДНЕЙ ОСИ ОБЪЕКТА(54) DEVICE FOR MEASURING THE LENGTH OF THE AVERAGE AXIS OF AN OBJECT

1one

Изобретение относитс к телевизионной технике, может быть использовано при автоматическом измерении параметров (длины ) изогнутых объектов.The invention relates to television technology, can be used in the automatic measurement of parameters (length) of curved objects.

Известно устройство дл измерени длины средней оси объекта, содержащее телевизионную камеру, выход которойсоединен со входом блока выделени хорды, элемент И, вход которого подключен к выходу генератора маркерных импульсов, и счетчик 1.A device is known for measuring the length of an object's average axis, comprising a television camera, the output of which is connected to the input of the chord highlighting unit, an element AND whose input is connected to the output of the marker pulse generator, and a counter 1.

Однако это устройство при измерении длины изогнутых объектов дает больпдую погрешность.However, this device when measuring the length of curved objects gives a large error.

Цель изобретени - повышение точности измерений длины объекта за счет измерени длины средней оси объекта.The purpose of the invention is to improve the accuracy of measuring the length of an object by measuring the length of the middle axis of the object.

Дл этого в устройство дл измерени длины средней оси объекта; содержащее телевизионную камеру, выход которой соединен со входом блока выделени хорды, элемент И, вход которого подключен к выходу генератора маркерных импульсов, и счётчик , введены блок сравнени смежных строк, два триггера, дифференцирующий блок и арифметический блок, причем выход блока выделени хорды через блок сравнени смежных строк соединены со вторым входом элемента И, выход которого через первый триггер подключен к первому входу счетчика, а выход счетчика соединен со входом арифметического блока; при этом второй вход элемента И через последовательно соединенные дифференцирующий блок и второй триггер подключен ко второму входу счетчика.For this purpose, in a device for measuring the length of the middle axis of an object; containing a television camera, the output of which is connected to the input of the chord selection unit, the element I whose input is connected to the output of the marker pulse generator, and a counter, a block for comparing adjacent lines, two triggers, a differentiating unit and an arithmetic unit are entered comparisons of adjacent lines are connected to the second input of the element I, the output of which through the first trigger is connected to the first input of the counter, and the output of the counter is connected to the input of the arithmetic unit; while the second input element And through a serially connected differentiating unit and the second trigger is connected to the second input of the counter.

На чертеже изображена структурна The drawing shows a structural

электрическа схема устройства.electrical circuit device.

Устройство содержит телевизионную ; амеру 1, блок выделени хорды 2, элемент И 3/ генератор маркерных импульсов 4-, блок сравнени смежных строк 5, триггер 6, счетчик 7, арифметический блок 8, дифференцирующий блок 9 и триггер 10.The device contains a television; Amer 1, chord allotment unit 2, element AND 3 / marker pulse generator 4-, comparison unit for adjacent lines 5, trigger 6, counter 7, arithmetic unit 8, differentiating unit 9 and trigger 10.

Устройство работает следующим образом. Изображение объекта, преобразованное телевизионной камерой 1 в телевизионный сигнал, поступает на блок выделени хорды 2, в котором из видеосигнала выдел ютс импульсы длины хорды в каждой строке.The device works as follows. The image of the object, converted by the television camera 1 to the television signal, is fed to the chord separation unit 2, in which pulses of chord length in each line are extracted from the video signal.

Claims

The impulses of chord lengths arrive at the comparison unit of adjacent lines 5, at the output of which pulses are formed, the duration of which is proportional to the difference between the beginnings and ends of adjacent chords (in adjacent lines). These diffuse pulses arrive at element I 3, to the other input of which impulses come from a generator of marker pulses 4. As a result, a series of pulses is formed at the output of element 3 and the number of which is proportional to the difference between the beginnings and ends of adjacent chords. In the trigger, the 6th series of pulses is divided into two, and these pulses go to counter 7, where they are recorded. The chord length pulses from the Comparison Unit of the adjacent lines 5 also receive the differentiating unit 9, from which the trigger 10 is supplied with the unipolar pulses corresponding to the falling edges of the pulses of the differences of the beginnings and ends of the adjacent chords. At the output of the trigger 10, a high potential corresponding to the falling edge of the pulse of the difference of the chord ends, entering the second counter input, allows a series of pulses to be read from the counter, the number of which is proportional to the projection of the element of the center axis of the object bounded by two adjacent lines. This series of pulses enters the arithmetic unit 8, where, according to the number of pulses (projection size) and line spacing, the segments (elements) of the broken center axis are calculated, which, adding, give the total length of the object’s average axis. Thus, the introduction of a unit for comparing adjacent lines, two triggers, differentiating and arithmetic blocks allows measuring the length of the center axis of an object, i.e., increasing the accuracy of measuring the length of a curved object. Formula for measuring the length of the center axis of an object containing a television camera which is connected to the input of the chord selection unit, the element I, the input of which is connected to the output of the generator of marker pulses, and a counter, characterized in that, in order to increase the accuracy of measuring the length of the volume m, entered a comparison block of adjacent lines, two flip-flops, a differentiating block and an arithmetic block, with the output of the chord selection block through the comparison block of adjacent rows connected to the second input of the AND element whose output through the first trigger is connected to the first input of the counter the input of the arithmetic unit, while the second input element And through a serially connected differentiating unit and the second trigger connected to the second input of the counter. Sources of information taken into account during the examination 1. Polonik V. S. Television automatic devices. M., “Holy, 1974, p. 105 (prototype).