CN101592671A - The linear array CCD camera velocity measurement shooting interval is with object of which movement speed adaptive method of adjustment - Google Patents
The linear array CCD camera velocity measurement shooting interval is with object of which movement speed adaptive method of adjustment Download PDFInfo
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Abstract
The invention discloses a kind of linear array CCD camera velocity measurement shooting interval with object of which movement speed adaptive method of adjustment, above the object of fast moving, on the direction of motion of object, linear array CCD camera is set, with former and later two laser spots light sources, former and later two pointolites are radiated at body surface and produce forward and backward luminous point; The present invention is positioned at the image of certain on the shooting line by continuous taking moving body surface, and after object moves a segment distance, photographic images again, whether seek body surface certain image occurs in the image of shooting afterwards, if in the back in the image of Pai Sheing, represent that then movement direction of object is consistent with shooting line, movement direction of object was with in the past the same, deviation does not appear, with the anti-speed that calculates the object operation that pushes away of the shooting time difference of two width of cloth images match, and with of the reference frame of this mistiming as interval shooting, on differing from this moment, following unsteady certain amplitude, test the speed shooting interval time of camera as line array CCD, make shooting time be complementary with object of which movement speed at interval, realize that shooting interval adjusts with the object of which movement speed adaptive.
Description
Technical field
The invention belongs to a kind of velocity measuring technique, specifically is that a kind of linear array CCD camera velocity measurement shooting interval is with object of which movement speed adaptive method of adjustment.
Background technology
Contactless measurement of rotational speed has a wide range of applications, the for example velocity survey of the yarn fabric of high-speed motion, printed matter, the measurement of cigarette machine high speed paper tape, the fluid-velocity survey of high-velocity fluid, the velocity survey of steel rolling mill's high temperature steel plate, glass factory's high temperature sheet glass velocity survey, automobile and ground relative velocity are measured, motor speed measurement, the speed of travelling belt, driving-belt, the measurement or the like of skidding.
Traditional laser Dppler veloicty measurement commercial measurement precision height, measuring speed be fast, but body surface is had very high requirement, can't adapt to the measurement of most of materials, and price is high, thereby only measures at excess fiber length, has obtained application in the minority fields such as flow field survey.
Ultrasonic velocity measurement such as ultrasonic Doppler, sound field commercial measurement speed is slow, and measuring accuracy is low, has obtained application widely in low speed, low precision measure occasion, yet can't satisfy the measurement requirement of high-speed, high precision.
Along with the development of China's industrial technology level, increasing industry has all proposed very high requirement to speed and measurement of length or metering.Traditional noncontact measurement is deposited a large amount of blind areas, can't satisfy the demand of China's industrial development.
Progress along with hardware technology, the online contactless measurement of rotational speed that utilizes linear CCD technology to carry out high-speed, high precision progressively becomes a reality, because testing the speed, line array CCD adopt image measuring method to realize, similar to traditional camera measuring technique, as long as therefore just can take and can measure, CCD tests the speed and can not be subjected to the material of testee, surface configuration, the influence of surface contamination cooperates suitable optical lens can also realize penetrating water smoke, mist of oil, dust and measures.And the line array CCD shooting speed is fast, and high speed linear array CCD camera per second can be taken more than 100,000 times, even can measure the speed of bullet.And cheap ordinary lines array CCD camera also can reach the shooting speed of per second 10,000 times, can be with cost near the ultrasonic Doppler velocity-measuring system, realization is near the precision and the speed of laser Dppler veloicty measurement, and this makes the CCD velocity measuring technique compare with other non-cpntact measurement equipment to have remarkable advantages.
But linear array CCD camera is when testing the speed, and it is very big to occur in the different application object of which movement velocity contrast through regular meeting, if at this moment line array CCD can not be adjusted shooting time at interval synchronously, can have influence on rate accuracy.
Summary of the invention
The purpose of this invention is to provide a kind of linear array CCD camera velocity measurement shooting interval with object of which movement speed adaptive method of adjustment, in linear array CCD camera is testing the speed process, chien shih CCD measuring period and object of which movement speed keep certain ratio when adjusting shooting interval automatically, make simultaneously and shooting interval time and object of which movement speeds match reduce the amount of calculation that image is compared.
Technical scheme of the present invention is as follows:
The linear array CCD camera velocity measurement shooting interval is characterized in that with object of which movement speed adaptive method of adjustment:
(1), above the object of fast moving, on the direction of motion of object, the line array CCD camera that tests the speed is set, with former and later two pointolites, former and later two pointolites are radiated at body surface and produce forward and backward luminous point; The line array CCD camera that tests the speed is carved the image on shot object surface at a time, and this image comprises forward and backward dot pattern picture, comprises first place's body surface information and second place's body surface information corresponding to forward and backward light spot position in the forward and backward dot pattern picture respectively;
(2), according to two pointolites body surface produce before, distance between the back luminous point, approximate velocity with the object operation, the first place's body surface the past luminous point operation that calculates object arrives the needed time Δ T roughly of back light spot position, Δ T is the reference frame of interval shooting time according to this time, the line array CCD camera interval shooting object operation image that tests the speed, and from the inferior captured back dot pattern picture in back, extract the body surface information that comprises in this back dot pattern picture, and with the preceding dot pattern picture of last time taking in first place's body surface information compare, judge its similarity, if similarity reaches pre-set threshold, two width of cloth images match then, represent that then first place's body surface the past light spot position has run to back light spot position, expression CCD camera shooting line is consistent with the direction of motion of object; If similarity can not reach pre-set threshold, then two width of cloth images do not match, and then adjust the shooting interval time, repeat shooting process, perhaps adjust the test the speed shooting line angle of camera of line array CCD, up to two width of cloth images match that obtain, then the adjustment of camera shooting line is finished;
(3), with the anti-speed that calculates the object operation that pushes away of the shooting time difference of two width of cloth images match, and with of the reference frame of this mistiming as interval shooting, the upper and lower unsteady certain amplitude of difference at this moment, test the speed shooting interval time of camera as line array CCD, make shooting time be complementary with object of which movement speed at interval.
Described linear array CCD camera velocity measurement shooting interval is characterized in that with object of which movement speed adaptive method of adjustment: described shooting time is spaced apart first sub-picture and takes zero-time to the time interval between second sub-picture shooting zero-time.
Described linear array CCD camera velocity measurement shooting interval is with object of which movement speed adaptive method of adjustment, it is characterized in that: described threshold value is meant: the body surface information of the whole or a certain part that comprises in the back dot pattern picture of back time shooting, and with the similarity degree of first place's body surface information in the preceding dot pattern picture of last time taking.
Described linear array CCD camera velocity measurement shooting interval is with object of which movement speed adaptive method of adjustment, it is characterized in that: described threshold value is meant: the body surface information of the whole or a certain part that comprises in the back dot pattern picture that the back time is taken reaches more than 70% with the similarity degree of first place's body surface information in the preceding dot pattern picture of last time taking.
Described shooting line and movement direction of object alignment schemes based on linear array CCD camera velocity measurement is characterized in that describedly on the direction of motion of object, linear array CCD camera is set is meant that the shooting line direction that linear array CCD camera is set is consistent with the direction of motion of object.
Advantage of the present invention:
The CCD camera that tests the speed can be adjusted shooting interval automatically according to the speed of testee, its purposes is for the too slow object of movement velocity, if the time interval that camera is taken two width of cloth images is too short then two width of cloth images may be just the same, be equivalent to almost can ignore taking in the time of two width of cloth images object of which movement, therefore cause velocity-measuring system to lose efficacy, if at this moment increase the shooting interval time, make the picture of object on two width of cloth images have tangible displacement, Measuring Object motion that then can be good.
In addition for the too fast object of movement velocity, if taking oversize then two width of cloth images of the time interval of two width of cloth images, camera possibly can't photograph same object, be equivalent to taking in the time of two width of cloth images object coverage of having moved out of, therefore cause velocity-measuring system to lose efficacy, if at this moment reduce the shooting interval time, make the picture of object on two width of cloth images have tangible displacement, do not exceed coverage again, Measuring Object motion that then can be good.
The camera system that tests the speed of design can have good adaptability to the testee of different motion speed like this, greatly reduces the modulation difficulty of camera system in different application that test the speed, and makes this type systematic have ease for use and versatility.
Description of drawings
Fig. 1 is a measurement mechanism mounting structure synoptic diagram of the present invention.
Fig. 2 is first place's body surface and the body surface constitutional diagram of second place behind the object of which movement.
Embodiment
The linear array CCD camera velocity measurement shooting interval is characterized in that with object of which movement speed adaptive method of adjustment:
(1), in object (cloth) 1 top of fast moving, on the direction of motion of object, the line array CCD camera that tests the speed is set, with former and later two pointolites 2,3, former and later two pointolites 2,3 are radiated at body surface and produce forward and backward luminous point 4,5; The line array CCD camera that tests the speed is carved the image on shot object surface at a time, and this image comprises forward and backward dot pattern picture, comprises first place's object, 6 surface informations and second place's object, 7 surface informations corresponding to forward and backward light spot position in the forward and backward dot pattern picture respectively;
(2), according to two pointolites body surface produce before, distance between the back luminous point, approximate velocity with the object operation, the first place's body surface the past luminous point operation that calculates object arrives the needed time Δ T roughly of back light spot position, Δ T is the reference frame of interval shooting time according to this time, the line array CCD camera interval shooting object operation image that tests the speed, and from captured back dot pattern picture, extract a certain local body surface information that comprises in this back dot pattern picture, and with preceding dot pattern picture in first place's body surface information compare, judge its similarity, if similarity reaches pre-set threshold---similarity reaches 70%, two width of cloth images match then, represent that then first place's body surface the past light spot position has run to back light spot position, expression CCD camera shooting line is consistent with the direction of motion of object; If similarity can not reach pre-set threshold, then two width of cloth images do not match, and then adjust the shooting interval time, repeat shooting process, perhaps adjust the test the speed shooting line angle of camera of line array CCD, up to two width of cloth images match that obtain, then the adjustment of camera shooting line is finished;
(3), with the anti-speed that calculates the object operation that pushes away of the shooting time difference of two width of cloth images match, and with of the reference frame of this mistiming as interval shooting, the upper and lower unsteady certain amplitude of difference at this moment, test the speed shooting interval time of camera as line array CCD, make shooting time be complementary with object of which movement speed at interval.
Claims (5)
1, the linear array CCD camera velocity measurement shooting interval is characterized in that with object of which movement speed adaptive method of adjustment:
(1), above the object of fast moving, on the direction of motion of object, the line array CCD camera that tests the speed is set, with former and later two pointolites, former and later two pointolites are radiated at body surface and produce forward and backward luminous point; The line array CCD camera that tests the speed is carved the image on shot object surface at a time, and this image comprises forward and backward dot pattern picture, comprises first place's body surface information and second place's body surface information corresponding to forward and backward light spot position in the forward and backward dot pattern picture respectively;
(2), according to two pointolites body surface produce before, distance between the back luminous point, approximate velocity with the object operation, the first place's body surface the past luminous point operation that calculates object arrives the needed time Δ T roughly of back light spot position, Δ T is the reference frame of interval shooting time according to this time, the line array CCD camera interval shooting object operation image that tests the speed, and from the inferior captured back dot pattern picture in back, extract the body surface information that comprises in this back dot pattern picture, and with the preceding dot pattern picture of last time taking in first place's body surface information compare, judge its similarity, if similarity reaches pre-set threshold, two width of cloth images match then, represent that then first place's body surface the past light spot position has run to back light spot position, expression CCD camera shooting line is consistent with the direction of motion of object; If similarity can not reach pre-set threshold, then two width of cloth images do not match, and then adjust the shooting interval time, repeat shooting process, perhaps adjust the test the speed shooting line angle of camera of line array CCD, up to two width of cloth images match that obtain, then the adjustment of camera shooting line is finished;
(3), with the anti-speed that calculates the object operation that pushes away of the shooting time difference of two width of cloth images match, and with of the reference frame of this mistiming as interval shooting, the upper and lower unsteady certain amplitude of difference at this moment, test the speed shooting interval time of camera as line array CCD, make shooting time be complementary with object of which movement speed at interval.
2, linear array CCD camera velocity measurement shooting interval according to claim 1 is characterized in that with object of which movement speed adaptive method of adjustment: described shooting time is spaced apart first sub-picture and takes zero-time to the time interval between second sub-picture shooting zero-time.
3, linear array CCD camera velocity measurement shooting interval according to claim 1 is with object of which movement speed adaptive method of adjustment, it is characterized in that: described threshold value is meant: the body surface information of the whole or a certain part that comprises in the back dot pattern picture of back time shooting, and with the similarity degree of first place's body surface information in the preceding dot pattern picture of last time taking.
4, linear array CCD camera velocity measurement shooting interval according to claim 3 is with object of which movement speed adaptive method of adjustment, it is characterized in that: described threshold value is meant: the body surface information of the whole or a certain part that comprises in the back dot pattern picture that the back time is taken reaches more than 70% with the similarity degree of first place's body surface information in the preceding dot pattern picture of last time taking.
5, shooting line and movement direction of object alignment schemes based on linear array CCD camera velocity measurement according to claim 1, it is characterized in that describedly on the direction of motion of object, linear array CCD camera is set is meant that the shooting line direction that linear array CCD camera is set is consistent with the direction of motion of object.
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| CN102128947B (en) * | 2010-01-14 | 2012-12-12 | 宝山钢铁股份有限公司 | Method and sensor for detecting relative sliding velocity between plate and mould in stamping process |
| CN102981009A (en) * | 2012-11-20 | 2013-03-20 | 北京工业大学 | Indirect speed measuring device |
| CN103576724A (en) * | 2012-08-08 | 2014-02-12 | 联想(北京)有限公司 | Image acquirer, electronic device and light adjusting method |
| CN104280567A (en) * | 2013-06-18 | 2015-01-14 | 林圣峰 | Method and device for identifying mobile image flow velocity |
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| CN102981009A (en) * | 2012-11-20 | 2013-03-20 | 北京工业大学 | Indirect speed measuring device |
| CN104280567A (en) * | 2013-06-18 | 2015-01-14 | 林圣峰 | Method and device for identifying mobile image flow velocity |
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