CN105301279A - Speed measurement method and speed measurement device based on camera, and mobile terminal - Google Patents
Speed measurement method and speed measurement device based on camera, and mobile terminal Download PDFInfo
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Abstract
The invention discloses a speed measurement method and a speed measurement device based on a camera, and a mobile terminal; wherein the speed measurement method comprises the steps of obtaining two images of a to-be-measured object on a photosensitive surface of the camera after the camera performs focusing and the position is fixed, wherein the photosensitive surface is parallel with the advancing route of the to-be-measured object; calculating the distance between the two images according to the positions of the two images on the photosensitive surface as the imaging displacement of the to-be-measured object; calculating an object distance according to the image distance and the focal length of the lens; calculating the actual displacement of the to-be-measured object according to the imaging displacement, the image distance and the object distance; and calculating the speed of the to-be-measured object according to the actual displacement and time interval between two times of imaging. According to the speed measurement method, the speed measurement device and the camera, speed measurement is performed on the moving object without adding of hardware, thereby settling a problem of complicated structure of speed measurement equipment. The speed measurement device according to the invention has advantages of simple structure and low cost.
Description
Technical field
The invention belongs to technical field of mobile terminals, relate to a kind of speed measurement method based on camera, device and mobile terminal.
Background technology
In traffic engineering, speed is metering and one of basic significant data assessing road performance and traffic.The gathering method of speed data has many kinds, comprises manual measurement fixed range running time method, pressure leather hose method, coil method, video processing method, radar velocity measurement method and laser velocimetry etc.Wherein the radar velocity measurement method high in degree of accuracy owned by France, is therefore widely adopted.
But, radar is a complicated electric mechanical mechanism, it comprises antenna, radome, feeder line, antenna pedestal, Radar Servo mechanical driving device, radar transmitter, radar cabinet, rack and annex thereof, extraordinary electromechanical assembly, for ensureing radar performance and quality, also very strict to the requirement of Radar Manufacturing, therefore, the manufacturing cost of radar velocity measurement equipment is higher.
Summary of the invention
In view of this, the object of the invention is to propose a kind of speed measurement method based on camera, device and mobile terminal, to solve the baroque problem of speed measuring equipment, reduce manufacturing cost.
For achieving the above object, the present invention adopts following technical scheme:
First aspect, embodiments provides a kind of speed measurement method based on camera, comprising:
At camera focusing and after position maintains static, obtain twice imaging of object under test on camera light-sensitive surface, described light-sensitive surface is parallel to the course of described object under test;
Be imaged on the position on described light-sensitive surface according to described twice, calculate the distance between described twice imaging, as the imaging displacement of described object under test;
Focometer according to image distance and camera lens calculates object distance;
The actual displacement of described object under test is calculated according to described imaging displacement, image distance and object distance;
The speed of described object under test is calculated according to the time interval of described actual displacement and described twice imaging.
Second aspect, embodiments provides a kind of velocity measuring device based on camera, comprising:
Imaging acquisition module, at camera focusing and after position maintains static, obtain twice imaging of object under test on camera light-sensitive surface, described light-sensitive surface is parallel to the course of described object under test;
Imaging displacement computing module, for the position be imaged on described light-sensitive surface according to described twice, calculates the distance between described twice imaging, as the imaging displacement of described object under test;
Object distance computing module, for calculating object distance according to the focometer of image distance and camera lens;
Actual displacement computing module, for calculating the actual displacement of described object under test according to described imaging displacement, image distance and object distance;
Speed calculation module, for calculating the speed of described object under test according to the time interval of described actual displacement and described twice imaging.
The third aspect, embodiments provides a kind of mobile terminal, and described mobile terminal comprises the velocity measuring device based on camera described in above-mentioned second aspect and camera.
The invention has the beneficial effects as follows: a kind of speed measurement method based on camera provided by the invention, device and mobile terminal, when surveying the speed of object under test, the camera minute surface of mobile terminal is made to be parallel to the course of object under test, and focus, complete defocused, rapid measuring targets carries out continuous shooting, and in process of taking pictures, mobile terminal maintains static, and obtains twice imaging of object under test on camera light-sensitive surface; According to the imaging displacement calculated, object distance, image distance and continuous shooting time interval that can pre-set, in the i.e. time interval of twice imaging, calculate the speed of object under test, solve the baroque problem of speed measuring equipment, without the need to increasing hardware unit, reduce manufacturing cost.
Accompanying drawing explanation
Exemplary embodiment of the present invention will be described in detail by referring to accompanying drawing below, the person of ordinary skill in the art is more clear that above-mentioned and other feature and advantage of the present invention, in accompanying drawing:
Fig. 1 is the schematic flow sheet of the speed measurement method based on camera that the embodiment of the present invention one provides;
Fig. 2 be the embodiment of the present invention one provide utilize the camera of mobile terminal to test the speed time schematic diagram;
Fig. 3 is the stressed schematic diagram being subjected to displacement change of motor in the camera that provides of the embodiment of the present invention one;
Fig. 4 is the lens that provide of the embodiment of the present invention one and light-sensitive surface position relationship schematic diagram;
Fig. 5 is the object under test imaging schematic diagram that the embodiment of the present invention one provides;
Fig. 6 is the structured flowchart of the velocity measuring device based on camera that the embodiment of the present invention two provides.
Embodiment
Technical scheme of the present invention is further illustrated by embodiment below in conjunction with accompanying drawing.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not entire infrastructure.
Embodiment one
Fig. 1 is the schematic flow sheet of the speed measurement method based on camera that the embodiment of the present invention one provides.The method is applicable to the situation of the translational velocity measuring object in visual range, and the method can be performed by the velocity measuring device based on camera arranged in the terminal.This device can be realized by the mode of software and/or hardware.As shown in Figure 1, the method comprises:
Step 110, at camera focusing and after position maintains static, obtain twice imaging of object under test on camera light-sensitive surface, wherein, light-sensitive surface is parallel to the course of object under test.
Exemplary, when measuring the speed of object under test, click the icon of velocity survey on mobile terminal, mobile terminal opens camera automatically; See Fig. 2, because object under test 15 is not far to the distance of camera, angular deviation little between the course of light-sensitive surface and object under test 15, little on measurement result impact, therefore, in practical operation, the course of the plane of mobile terminal and object under test 15 arrow line of object under test 15 process (in the figure) should be made parallel, to ensure that camera light-sensitive surface is parallel to the course of object under test 15 as far as possible as far as possible; Enter camera lens within sweep of the eye at object under test 15, complete defocused, keep mobile terminal to maintain static, rapid measuring targets 15 carries out continuous shooting, and above-mentioned velocity measuring device obtains twice imaging of object under test 15 on camera light-sensitive surface.
Step 120, the position be imaged on according to twice on light-sensitive surface, calculate the distance between twice imaging, as the imaging displacement of object under test.
Because light-sensitive surface keeps motionless, therefore, for the object under test of motion, its not in the same time on light-sensitive surface the position of imaging also different, velocity measuring device obtains the position be imaged on for twice on light-sensitive surface, be imaged on the position on light-sensitive surface according to twice, calculate the distance between twice imaging, using the imaging displacement of this distance as object under test.
Preferably, this step can comprise: analyze contrast twice imaging, choose the picture point of twice imaging corresponding position as two reference point; Calculate the distance between two reference point, as the imaging displacement of object under test.Image procossing is carried out in twice imaging, a picture point is chosen wherein as a reference point in Polaroid, wherein Polaroidly to be analyzed separately Polaroid and above-mentioned, choose the picture point of corresponding position as another reference point, calculate the distance between two reference point, obtain the imaging displacement of object under test.Be calculated to be image displacement by reference to point, make measurement result more accurate.
Step 130, calculate object distance according to the focometer of image distance and camera lens.
Wherein, image distance can be calculated according to the size of drive current.In the present embodiment, see Fig. 3 and Fig. 4, motor 10 is arranged in the support 12 of camera, and drawn by spring 11, the magnetic field force F be subject to balancing motor 10, makes motor 10 can be fixed on certain position of support 12, drives the lens 13 in camera to stretch with this.Wherein, the position of support 12 and length thereof limit lens 13 to the distance of light-sensitive surface 14 and the minimum value x of image distance
minwith maximal value x
max, the initial position of lens 13 is at image distance minimum value place.
Concrete, small-sized magnetic field is distributed with in camera bracket 12, controller in mobile terminal controls driving circuit, provides size to be the drive current of I, drive current through motor 10 coil by driving circuit for motor 10, make hot-wire coil in magnetic field, be subject to magnetic field force F, and this magnetic field force size F=KBI, wherein, K is constant, B is magnetic field intensity, and I is drive current.Now, motor 10 is also subject to the spring draft force F contrary with magnetic field force direction
bulleteffect, and this spring draft force size F
bullet=kX, wherein, k is spring constant, and X is the displacement that motor 10 occurs.Work as F
bulletwhen balancing with F, motor 10 is fixed in support 12, and lens 13 stop mobile, thus, and F
bullet=F, can obtain
image distance
therefore, the velocity measuring device based on camera obtains the size of drive current, just can calculate image distance.
Concrete, after obtaining image distance and focal length based on the velocity measuring device of camera, based on following formulae discovery object distance:
Wherein, u is object distance, represents the distance of object under test to cam lens; V is image distance, represents the distance of lens to light-sensitive surface; F is focal length, represents the distance of lens center to focus.
In the present embodiment, the focal length of mobile terminal camera lens can be a constant.
It should be noted that, the image distance in the present embodiment can also be tested oneself by camera module, and the velocity measuring device based on camera directly obtains measurement result.
Step 140, calculate the actual displacement of object under test according to imaging displacement, image distance and object distance.
Further, the actual displacement of object under test can be calculated according to imaging displacement, image distance and object distance based on the velocity measuring device of camera.See Fig. 5, first time is when taking pictures, object under test 15 becomes first time imaging 16 through lens 13 on light-sensitive surface 14, when second time is taken pictures, object under test 15 becomes second time imaging 17 through lens 13 on light-sensitive surface 14, first time imaging 16 is imaging displacement to the displacement of second time imaging 17, because light-sensitive surface 14 is parallel to the course of object under test 15, therefore, imaging displacement y is parallel to the actual displacement x of object under test 15, by similar triangles cor-responding identified theorems, specifically can based on the actual displacement size of following formulae discovery object under test:
Wherein, x is the actual displacement of object under test; Y is the imaging displacement of object under test.
Step 150, calculate the speed of object under test according to the time interval of actual displacement and twice imaging.
Exemplary, the time interval of continuous shooting can be set before continuous shooting, determine the time interval of twice imaging according to the time interval of continuous shooting, finally calculate the speed of object under test according to the time interval of actual displacement and twice imaging, specifically can based on the speed of following formulae discovery object under test:
Wherein, V is the speed of object under test, and Δ t is the time interval of twice imaging.
The speed measurement method based on camera that the embodiment of the present invention one provides, when surveying the speed of object under test, the camera minute surface of mobile terminal is made to be parallel to the course of object under test, focus when object under test enters the cam lens visual field, complete defocused, rapid measuring targets carries out continuous shooting, and in process of taking pictures, mobile terminal maintains static, and obtains twice imaging of object under test on camera light-sensitive surface; According to the imaging displacement calculated, object distance, image distance and continuous shooting time interval that can pre-set, in the i.e. time interval of twice imaging, calculate the speed of object under test, solve the baroque problem of speed measuring equipment, without the need to increasing hardware unit, reduce manufacturing cost.
Embodiment two
Fig. 6 is the structured flowchart of the velocity measuring device based on camera that the embodiment of the present invention two provides.As shown in Figure 6, this device comprises: imaging acquisition module 20, imaging displacement computing module 21, object distance computing module 22, actual displacement computing module 23 and speed calculation module 24.
Wherein, imaging acquisition module 20 is at camera focusing and after position maintains static, obtain twice imaging of object under test on camera light-sensitive surface, wherein, light-sensitive surface is parallel to the course of object under test;
Imaging displacement computing module 21, for being imaged on the position on light-sensitive surface according to twice, calculates the distance between twice imaging, as the imaging displacement of object under test;
Object distance computing module 22 is for calculating object distance according to the focometer of image distance and camera lens;
Actual displacement computing module 23 is for calculating the actual displacement of object under test according to imaging displacement, image distance and object distance;
Speed calculation module 24 is for calculating the speed of object under test according to the time interval of actual displacement and twice imaging.
Preferably, in such scheme, imaging displacement computing module 21 comprises:
Reference point chooses unit, for analyzing contrast twice imaging, chooses the picture point of twice imaging corresponding position as two reference point;
Imaging displacement computing unit, for calculating the distance between two reference point, as the imaging displacement of object under test.
Further, in such scheme, object distance computing module 22 specifically for:
Based on following formulae discovery object distance:
Wherein, u is object distance, represents the distance of cam lens to object under test course; V is image distance, represents the distance of lens to light-sensitive surface; F is focal length, represents the distance of lens center to focus.
Further, in such scheme, actual displacement computing module 23 specifically for:
Actual displacement based on following formulae discovery object under test:
Wherein, x is the actual displacement of object under test; Y is the imaging displacement of object under test.
The velocity measuring device based on camera that the embodiment of the present invention two provides may be used for the speed measurement method based on camera that the execution embodiment of the present invention provides, and possesses corresponding function and beneficial effect.
Embodiment three
The mobile terminal that the embodiment of the present invention three provides, comprises the velocity measuring device based on camera and camera that the embodiment of the present invention two provides.This mobile terminal, by the velocity measuring device based on camera provided by the invention, adopts corresponding speed measurement method to measure the translational speed of object in visual range.
Wherein, mobile terminal can be smart mobile phone, panel computer or personal digital assistant etc.
The mobile terminal that the embodiment of the present invention three provides, comprises the velocity measuring device based on camera that the embodiment of the present invention provides, possesses corresponding function and beneficial effect.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (9)
1. based on a speed measurement method for camera, it is characterized in that, comprising:
At camera focusing and after position maintains static, obtain twice imaging of object under test on camera light-sensitive surface, described light-sensitive surface is parallel to the course of described object under test;
Be imaged on the position on described light-sensitive surface according to described twice, calculate the distance between described twice imaging, as the imaging displacement of described object under test;
Focometer according to image distance and camera lens calculates object distance;
The actual displacement of described object under test is calculated according to described imaging displacement, image distance and object distance;
The speed of described object under test is calculated according to the time interval of described actual displacement and described twice imaging.
2. method according to claim 1, is characterized in that, the described position be imaged on described light-sensitive surface according to described twice, calculates the distance between described twice imaging, as the imaging displacement of described object under test, comprising:
Analyze described twice imaging of contrast, choose the picture point of described twice imaging corresponding position as two reference point;
Calculate the distance between described two reference point, as the imaging displacement of described object under test.
3. method according to claim 1, is characterized in that, the described focometer according to image distance and camera lens calculates object distance, comprising:
Based on following formulae discovery object distance:
Wherein, u is object distance, represents the distance of cam lens to object under test course; V is image distance, represents the distance of light-sensitive surface to lens; F is focal length, represents the distance of focus to lens center.
4. method according to claim 3, is characterized in that, the described actual displacement calculating described object under test according to described imaging displacement, image distance and object distance, comprising:
Actual displacement based on following formulae discovery object under test:
Wherein, x is the actual displacement of object under test; Y is the imaging displacement of object under test.
5. based on a velocity measuring device for camera, it is characterized in that, comprising:
Imaging acquisition module, at camera focusing and after position maintains static, obtain twice imaging of object under test on camera light-sensitive surface, described light-sensitive surface is parallel to the course of described object under test;
Imaging displacement computing module, for the position be imaged on described light-sensitive surface according to described twice, calculates the distance between described twice imaging, as the imaging displacement of described object under test;
Object distance computing module, for calculating object distance according to the focometer of image distance and camera lens;
Actual displacement computing module, for calculating the actual displacement of described object under test according to described imaging displacement, image distance and object distance;
Speed calculation module, for calculating the speed of described object under test according to the time interval of described actual displacement and described twice imaging.
6. device according to claim 5, is characterized in that, described imaging displacement computing module comprises:
Reference point chooses unit, for analyzing described twice imaging of contrast, chooses the picture point of described twice imaging corresponding position as two reference point;
Imaging displacement computing unit, for calculating the distance between described two reference point, as the imaging displacement of described object under test.
7. device according to claim 5, is characterized in that, described object distance computing module specifically for:
Based on following formulae discovery object distance:
Wherein, u is object distance, represents the distance of cam lens to object under test course; V is image distance, represents the distance of lens to light-sensitive surface; F is focal length, represents the distance of lens center to focus.
8. device according to claim 7, is characterized in that, described actual displacement computing module specifically for:
Actual displacement based on following formulae discovery object under test:
Wherein, x is the actual displacement of object under test; Y is the imaging displacement of object under test.
9. a mobile terminal, is characterized in that, described mobile terminal comprises the velocity measuring device based on camera described in any one of claim 5-8 and camera.
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