Image collection control method and device, and vehicle chassis image obtaining system
地域：
Zhejiang
摘要
Embodiments of a method and device for controlling image capturing and a system for acquiring an image of a chassis of a vehicle are provided, which relate to image capturing technology and can eliminate deformation of images occurred due to stretch or compression in image capturing. The system includes a speed measuring module, a control module, and a line scan camera. The speed measuring module measures the speed of the vehicle and transmits the measured speed of the vehicle to the control module. The control module determines line frequency for image capturing according to the speed of the vehicle, and controls the line scan camera to perform image capturing on the chassis of the vehicle with the line frequency.
說明書
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The present application claims priority to PCT International Application No. PCT/CN2018/084649, filed Apr. 26, 2018, which claims priority to Chinese patent application No. 201710323498.9 filed with the China National Intellectual Property Administration (CNIPA) on May 9, 2017 and entitled “Image Acquisition Control Method, Control Device and Image Acquisition System”, Chinese patent application No. 201710324300.9 filed with the CNIPA on May 9, 2017 and entitled “System for acquiring an image of a chassis of a vehicle and Image Acquisition Control Method”, and Chinese patent application No. 201720510153.X filed with the CNIPA on May 9, 2017 and entitled “System for acquiring an image of a chassis of a vehicle”, which are each incorporated herein by reference in their entireties.
The present application relates to image capturing technology, and in particular, to a method and device for controlling image capturing and a system for acquiring an image of a chassis of a vehicle.
A line scan camera is a camera employing a line scan image sensor. The sensor of the line scan camera has one or more rows of photosensitive elements. The line scan camera records image data by scanning one line at a time, and has high scanning frequency and high resolution. Generally, an object moves perpendicular to the line scan direction of the image sensor in the line scan camera, and one or more line scan cameras continuously scan the object line by line.
權(quán)利要求
The invention claimed is:1. A method for controlling image capturing, comprising:measuring a speed of an object by a speed measuring module comprising an image capturing module, the measuring comprising:capturing, by the image capturing module, images of the object in motion continuously, and calculating the number of pixels VP that the object travels across per unit time on an imaging plane of the image capturing module by using the continuously captured images, the calculating comprising:determining relative positions of a feature point of the object both in the i-th image and in the (i+1)-th image captured by the image capturing module, wherein i is an integer and 1≤i<m, and m is the total number of the images captured by the image capturing module; determining the number of pixels n between the determined two relative positions; and calculating the number of pixels Vp that the object travels across per unit time on the imaging plane of the image capturing module according to the following formula:Vp=n/t; wherein t is a time interval between the capturing of the i-th image and the capturing of the (i+1)-th image by the image capturing module; determining line frequency for image capturing according to the speed of the object by determining the line frequency for image capturing according to the calculated number of pixels VP; and controlling a line scan camera to perform image capturing on the object with the line frequency; wherein a linking line linking the image capturing module and the line scan camera is parallel to a direction of motion of the object; wherein before measuring the speed of the object, the method further comprises: detecting incoming of the object; and in response to that the incoming of the object is detected, generating an incoming signal to trigger the measurement of the speed of the object, and wherein the method further comprises: detecting leaving of the object; and in response to that the leaving of the object is detected, generating an outgoing signal to control the line scan camera to stop the image capturing on the object. 2. The method for controlling image capturing according to claim 1 , wherein the step of determining the line frequency for image capturing according to the calculated number of pixels VP comprises:determining the line frequency for image capturing Q according to the following formula:Q=Vp*(p2/f2)*(f1/p1); wherein, Vp is the number of pixels that the object travels across per unit time on the imaging plane of the image capturing module; p2 is a size of a single pixel of the image capturing module; f2 is a focal length of the image capturing module; p1 is a size of a single pixel of the line scan camera; and f1 is a focal length of the line scan camera, and wherein the direction of motion of the object is a direction from the image capturing module towards the line scan camera. 3. The method for controlling image capturing according to claim 1 , wherein the step of determining the line frequency for image capturing according to the speed of the object comprises:determining the line frequency for image capturing according to the speed of the object, the number of pixels per one row of the line scan camera and a preset scale factor. 4. The method for controlling image capturing according to claim 3 , wherein the step of determining the line frequency for image capturing according to the speed of the object, the number of pixels per one row of the line scan camera and the preset scale factor comprises:calculating the line frequency for image capturing Q according to the following formula:Q=k*w*v; wherein v is the speed of the object; w is the number of pixels per one row of the line scan camera; and k is the preset scale factor. 5. The method for controlling image capturing according to claim 1 , whereinthe measuring of the speed of the object comprises: detecting a change in the speed of the object; and in response to that a change in the speed of the object is detected, determining the changed speed; wherein the determining of the line frequency for image capturing according to the speed of the object comprises: determining new line frequency for image capturing according to the changed speed; and wherein the controlling of the line scan camera to perform image capturing on the object with the line frequency comprises: continuing the image capturing on the object with the newly determined line frequency. 6. The method for controlling image capturing according to claim 1 , further comprising:providing fill-in light for the object while the line scan camera is controlled to perform image capturing on the object. 7. An electronic device, comprising a processor and a machine-readable storage medium, wherein the machine-readable storage medium has stored thereon machine executable instructions which, when executed by the processor, cause the processor to carry out the method of claim 1 . 8. A non-transitory machine-readable storage medium having stored thereon machine executable instructions which, when called and executed by a processor, cause the processor to carry out the method of claim 1 . 9. A system for acquiring an image of a chassis of a vehicle, comprising a speed measuring module, a control module and a line scan camera; whereinthe speed measuring module and the line scan camera are electrically connected to the control module, respectively; the speed measuring module is configured to measure a speed of the vehicle and transmit the measured speed of the vehicle to the control module; and the control module is configured to determine line frequency for image capturing according to the speed of the vehicle, and control the line scan camera to perform image capturing on the chassis of the vehicle with the line frequency; wherein the speed measuring module comprises an image capturing module, and a linking line linking the image capturing module and the line scan camera is parallel to a direction of motion of the vehicle; wherein the speed measuring module measures the speed of the object by:capturing, by the image capturing module, images of the object in motion continuously, and calculating the number of pixels VP that the object travels across per unit time on an imaging plane of the image capturing module by using the continuously captured images, the calculating further including:determining relative positions of a feature point of the object both in the i-th image and in the (i+1)-th image captured by the image capturing module, wherein i is an integer and 1≤i<m, and m is the total number of the images captured by the image capturing module; determining the number of pixels n between the determined two relative positions; and calculating the number of pixels Vp that the object travels across per unit time on the imaging plane of the image capturing module according to the following formula:Vp=n/t; wherein t is a time interval between the capturing of the i-th image and the capturing of the (i+1)-th image by the image capturing module, wherein the line frequency for image capturing is determined according to the calculated number of pixels VP, wherein before measuring the speed of the object, the method further comprises: detecting incoming of the object; and in response to that the incoming of the object is detected, generating an incoming signal to trigger the measurement of the speed of the object, and wherein the method further comprises: detecting leaving of the object; and in response to that the leaving of the object is detected, generating an outgoing signal to control the line scan camera to stop the image capturing on the object. 10. The system for acquiring an image of a chassis of a vehicle according to claim 9 , wherein the control module is further configured to:determine the line frequency for image capturing according to the speed of the vehicle, the number of pixels per one row of the line scan camera and a preset scale factor. 11. The system for acquiring an image of a chassis of a vehicle according to claim 10 , wherein the control module is further configured to calculate the line frequency for image capturing Q according to the following formula:Q=k*w*v; wherein v is the speed of the vehicle; w is the number of pixels per one row of the line scan camera; and k is the preset scale factor. 12. The system for acquiring an image of a chassis of a vehicle according to claim 9 , whereinthe speed measuring module is further configured to detect a change in the speed of the vehicle; and in response to that a change in the speed of the vehicle is detected, determine the changed speed; wherein the control module is further configured to determine new line frequency for image capturing according to the changed speed; and wherein the line scan camera is further configured to continue the image capturing on the chassis of the vehicle with the newly determined line frequency. 13. The system for acquiring an image of a chassis of a vehicle according to claim 9 , further comprising a light filling module configured to provide fill-in light for the chassis of the vehicle under the control of the control module,and/or wherein the light filling module is arranged on a side of the line scan camera and located on a line scan direction of the line scan camera. 14. The system for acquiring an image of a chassis of a vehicle according to claim 9 , further comprising:a first detecting module, arranged on a side of the speed measuring module near where the vehicle enters, which is configured to detect incoming of the vehicle, generate an incoming vehicle signal in response to that the incoming of the vehicle is detected, and transmit the incoming vehicle signal to the speed measuring module to trigger the speed measuring module to measure the speed of the vehicle. 15. The system for acquiring an image of a chassis of a vehicle according to claim 14 , further comprising:a second detecting module, arranged on a side of the line scan camera near where the vehicle leaves, which is configured to detect leaving of the vehicle, generate an outgoing signal in response to that the leaving of the vehicle is detected, and transmit the outgoing signal to the control module to trigger the control module to control the line scan camera to stop the image capturing on the chassis of the vehicle. 16. The system for acquiring an image of a chassis of a vehicle according to claim 9 , further comprising:a metal protection cylinder; wherein the line scan camera is arranged in the metal protection cylinder; and wherein a transparent cover for a lens of the line scan camera is arranged on the metal protection cylinder, a damage-proof protection member is arranged over the transparent cover, and a light incident hole is formed on the damage-proof protection member. 17. The system for acquiring an image of a chassis of a vehicle according to claim 16 , wherein the metal protection cylinder comprises an outer cylinder and an inner cylinder sleeved in the outer cylinder, whereinthe line scan camera is arranged inside the inner cylinder; the transparent cover is supported over the inner cylinder, and the damage-proof protection member is supported over the outer cylinder.
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