CN102892027B - System and method for measuring frame delay time of photographic system of optical measurement equipment - Google Patents
System and method for measuring frame delay time of photographic system of optical measurement equipment Download PDFInfo
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Abstract
The invention discloses a system and a method for measuring frame delay time of a photographic system of optical measurement equipment, wherein the method comprises the following steps: the system comprises an image recording device (1), a camera system (2) and a timing system terminal (3), wherein the image recording device controls and displays an LED lamp array device (4) and an LED lamp array (5), and the number of frames of delayed images output by a camera is judged according to time information on digital images output by the camera system and information of the LED lamp array; the time system terminal provides time and an external interrupt signal; the image recording device records images of the camera system and superposes time information of the recording time; the control and display LED lamp array device controls the LED array to switch on and off the LED lamp according to the external interrupt signal and the time information; the camera system images the LED array. The system and the method of the invention realize the accurate calibration of the delay time of the image output by the camera system.
Description
Technical field
The present invention relates to high accuracy optical measuring device and demarcate, and the field such as videographic measurment.
Background technology
Optical measuring device is a kind of discontiguous measuring equipment, and it carries out imaging to target, then obtains position, attitude and some other information of target by the mode that image is processed.Due to the accuracy that optical measuring device is measured, make optical measuring device be widely used in the every field of civil and military.In optical measuring device, camera system is an important device, and it is by video camera, camera lens and other accessory circuit installation composition.In optical measuring device production process, in order to have a clear understanding of the precision of equipment, generally to demarcate camera system.The object of demarcating is to determine photocentre, optical axis, focal length and other some physical parameters of camera system, obtains under static conditions but these parameters are all camera systems.
Be accompanied by progress and the development of technology, there is variation in modern camera system especially video camera, and the mode of its imaging is also different; The attached processing of circuit device of camera system also becomes increasingly complex simultaneously, and these treatment circuits not only can carry out A/D or D/A conversion to image; Can stretch, overturn, strengthen and reject the processing such as bad point to image simultaneously.In sum, it is not the image when frame that these factors make the image that video camera is exported after end exposure, generally postpones 0 ~ 3 frame; And for some complicated camera system, this delay may have 10 frames even larger.And postpone to demarcate by static conditions.Simultaneously, because arranging of the delay of image output and camera system is relevant, give birth to change as camera frame takes place frequently, can make the delay of video camera also change.Postponing to measure static object for optical measuring device does not affect, but can produce larger error for the measurement of dynamic object.Thereby be necessary optical measuring device camera system to measure time of delay, to eliminate or to reduce the measure error of optical measuring device to dynamic object.The demarcation simultaneously camera system being postponed can provide effective reference for controlling the control system that optical measuring device rotates, for the design debug of control system etc. provides foundation.
Summary of the invention
The technical problem to be solved in the present invention is, the optical measuring device camera system frame delay time is measured, and carries out Accurate Calibration, to improve the precision of optical measuring device to reach the frame number that camera system output image is postponed.System comprises camera system, time terminal, and image recording structure, and control and demonstration LED lamp array apparatus.The function of each device is: time terminal produces interrupt signal and temporal information, and image recording structure document image also superposes temporal information to image; Camera system is carried out imaging to LED lamp array; Control and show that LED lamp array apparatus makes LED lamp array have different demonstrations by judging temporal information control LED lamp array.
The technical solution used in the present invention is: the system of a kind of optical measuring device camera system frame delay time measurement, comprise camera system, and time terminal, image recording structure, and control and demonstration LED lamp array apparatus.It is characterized in that, time terminal connects image recording structure, camera system and LED lamp antenna array control and display unit, and video camera output connects image recording structure, and camera system is carried out imaging to LED lamp array.
The device that described frame delay is measured, the time that LED lamp is opened and closed is all far smaller than a frame time, relatively negligible.
The device that described frame delay is measured, tape deck can be by the middle of the temporal information collecting the digital picture that can be superposeed, with can subsequent treatment.
The device that described frame delay is measured, no matter camera system self produces simulation or digital picture, all should produce digital picture output.
The device that described frame delay is measured, time terminal can adopt to export and interrupts and the device that interrupts counting is replaced.
The method that the time measurement of a kind of optical measuring device camera system frame delay is provided in addition, comprises the steps:
Step 1), camera system parameter is arranged to open system;
Step 2), time terminal output interrupt signal, interrupt signal arrives camera system and triggers it and start exposure, exports interrupt signal to controlling and showing LED lamp array apparatus simultaneously, controls and shows LED lamp array apparatus to trigger;
After step 3), control and demonstration LED lamp array apparatus are triggered, gather the temporal information of time terminal, and according to which LED lamp on temporal information control LED lamp array should be lit, which LED lamp should be closed;
Step 4), camera system, in time for exposure section, are carried out imaging to LED lamp on LED array;
After step 5), camera system end exposure, image recording structure records the output image of camera system, gathers the temporal information of time terminal simultaneously, and is superimposed upon on image.
Step 6), according to the information of the temporal information in digital picture and LED lamp array, judge video camera output image postpone frame number.Temporal information is: the time obtaining by LED lamp array, deduct the time being superimposed upon on image.Concrete example as: temporal information is: t
2-t
1, wherein t
1for the time that the camera system being obtained by LED lamp array inverse starts exposure, t
2start the time of document image for being superimposed upon image recording structure on image.Postponing frame number is:
the time interval that wherein Δ t is every frame,
for rounding operator.
Step 7), video camera is carried out to different settings, again completes 1) to 5) step operation, realize in difference lower demarcation under camera system is arranged is set.
Wherein, the temporal information that LED lamp array control device can be different according to time terminal, lights or closes the different LED lamp on LED array, and the frame number that closed array should be greater than transfer delay is opened or closed to the LED lamp that LED lamp array forms.
Wherein, camera system output LED panel image should be differentiated lighting or closing of LED lamp on panel.
The present invention's advantage is compared to the prior art:
1, the present invention, owing to introducing time terminal, makes the control of camera system to the time of exposure and control and demonstration LED lamp array apparatus can be accurate to microsecond to the control of LED lamp array, makes calibration result more accurately reliable.
2, the present invention not only can obtain camera system output image delay frame number, can accurately obtain time of delay (as required simultaneously, it is following that precision can reach millisecond), reach the Accurate Calibration to optical measuring device camera system, for later data space-time registration provides foundation.
Brief description of the drawings
Fig. 1 is camera system frame delay time measurement system block diagram representation;
In figure, 1 is image recording structure, and 2 is camera system, and 3 is time terminal, and 4 for controlling and showing LED lamp array apparatus, and 5 is LED lamp array;
Fig. 2 is camera system frame delay Method Of Time Measurement flow chart.
Embodiment
Further illustrate the present invention below in conjunction with the drawings and specific embodiments.
The system of a kind of optical measuring device camera system frame delay time measurement, comprise camera system 2, time terminal 3, image recording structure 1, control and show LED lamp array apparatus 4 and LED lamp array 5, time terminal 3 linkage record devices 1, camera system 2 and control and demonstration LED lamp array apparatus 4, camera system 2 outputs connect image recording structure 1, and camera system 2 is carried out imaging to LED lamp array 5.
The system of described frame delay time measurement, the time that LED lamp is opened and closed is all far smaller than a frame time, relatively negligible;
The system of described frame delay time measurement, tape deck can and can be superposeed in the middle of digital picture the temporal information collecting, with can subsequent treatment;
The system of described frame delay time measurement, no matter camera system self produces simulation or digital picture, all should produce digital picture output;
The system of described frame delay time measurement, time terminal can adopt to export and interrupts and the device that interrupts counting is replaced.
Wherein the XHTF7100 of time terminal employing Chendu Spaceon Electronics Co., Ltd. is product, and its outer synchronizing frequency of generation and time service precision are in microsecond rank; Wherein control and show that the Virtex E Series FPGA that LED lamp array apparatus adopts Xilinx company to produce, tape deck adopt NARD FLASH as storage medium, the device of its data record control and acquisition time is Virtex E Series FPGA.Image recording structure is connected by Cameralink interface with camera system.LED lamp array is built by light-emitting diode, selects different LED light-emitting diodes according to camera system imaging characteristics, for example, while adopting thermal camera, can adopt infrarede emitting diode.Layout and the interval etc. of LED lamp array will be according to the setting parameter such as camera lens, focal length of camera system, to differentiate the situation of LED lamp on the image that is able to be become in camera system.The present invention presses the flow implementation shown in Fig. 2.
A method for optical measuring device camera system frame delay time measurement, comprises the steps:
The concrete steps of measuring process are:
Step 1), camera system parameter is arranged to open system;
Step 2), time terminal output interrupt signal, interrupt signal arrives camera system and triggers it and start exposure, exports interrupt signal to controlling and showing LED lamp array apparatus simultaneously, controls and shows LED lamp array apparatus to trigger;
After step 3), control and demonstration LED lamp array apparatus are triggered, gather the temporal information of time terminal, and according to which LED lamp on temporal information control LED lamp array should be lit, which LED lamp should be closed;
Step 4), camera system, in time for exposure section, are carried out imaging to LED lamp on LED array;
After step 5), camera system end exposure, image recording structure records the output image of camera system, gathers the temporal information of time terminal simultaneously, and is superimposed upon on image.
Step 6), according to the information of the temporal information in digital picture and LED lamp array, judge video camera output image postpone frame number.The frame delay time is: the time obtaining by LED lamp array, deduct the time being superimposed upon on image.
Step 7), video camera is carried out to different settings, again completes 1) to 5) step operation, realize in difference lower demarcation under camera system is arranged is set.
The method of described frame delay time measurement, controls and the temporal information that shows that LED lamp array apparatus can be different according to time terminal, lights or close the different LED lamp on LED array.Number of combinations is opened or closed to the LED lamp that LED lamp array forms should be greater than the frame number that camera system postpones.
The method that described frame delay is measured, is characterized in that camera system output LED lamp array image should differentiate lighting or closing of LED lamp on panel.
The above; it is only part execution mode of the present invention; but protection scope of the present invention is not limited to this; any people who is familiar with this technology is in the disclosed technical scope of the present invention; the replacement being understood that or increase and decrease; all should be encompassed in of the present invention comprise scope within, therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (1)
1. the method for optical measuring device camera system frame delay time measurement, the method is utilized the system of optical measuring device camera system frame delay time measurement, it comprises image recording structure (1), camera system (2), time terminal (3), control and demonstration LED lamp array apparatus (4) and LED lamp array (5), time terminal (3) connects image recording structure (1), camera system (2) and control and demonstration LED lamp array apparatus (4), camera system (2) output connects image recording structure (1), camera system (2) is carried out imaging to LED lamp array (5), the time that LED lamp is opened and closed is all far smaller than a frame time, relatively negligible, tape deck can will collect in the middle of the temporal information the digital picture that can be superposeed of time terminal, with can subsequent treatment, no matter camera system self produces simulation or digital picture, all should produce digital picture output, time terminal can adopt to export and interrupts and the device that interrupts counting is replaced, and it is characterized in that, comprises the steps:
Step 1), camera system parameter is arranged to open system;
Step 2), time terminal output interrupt signal, interrupt signal arrives camera system and triggers it and start exposure, exports interrupt signal to controlling and showing LED lamp array apparatus simultaneously, controls and shows LED lamp array apparatus to trigger;
Step 3), control and show that LED lamp array apparatus is triggered after, gather the temporal information of time terminal, and according to which LED lamp on temporal information control LED lamp array should be lit, which LED lamp should be closed;
Step 4), camera system in time for exposure section, LED lamp on LED array is carried out to imaging;
Step 5), after camera system end exposure, image recording structure records the output image of camera system, gathers the temporal information of time terminal simultaneously, and is superimposed upon on image;
Step 6), according to the information of the temporal information in digital picture and LED lamp array, judge video camera output image postpone frame number, temporal information is: the time obtaining by LED lamp array, deduct the time being superimposed upon on image; Concrete, temporal information is: t
2-t
1, wherein t
1for the time that the camera system being obtained by LED lamp array inverse starts exposure, t
2start the time of document image for being superimposed upon image recording structure on image, postpone frame number and be:
the time interval that wherein Δ t is every frame,
for rounding operator;
Step 7), camera system parameter is carried out to different settings, again complete 1) to 5) step operation, realize, in difference, the lower demarcation to camera system be set;
Wherein, control and the temporal information that shows that LED lamp array apparatus can be different according to time terminal, light or close the different LED lamp on LED array, the frame number that closed array should be greater than transfer delay is opened or closed to the LED lamp that LED lamp array forms; The LED lamp array image of camera system output should be differentiated lighting or closing of LED lamp.
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| CN201210375103.7A CN102892027B (en) | 2012-09-29 | 2012-09-29 | System and method for measuring frame delay time of photographic system of optical measurement equipment |
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| CN201210375103.7A CN102892027B (en) | 2012-09-29 | 2012-09-29 | System and method for measuring frame delay time of photographic system of optical measurement equipment |
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| CN100551086C (en) * | 2005-12-08 | 2009-10-14 | 中兴通讯股份有限公司 | A kind of system and method for detecting picture time delay |
| CN102158728A (en) * | 2011-04-08 | 2011-08-17 | 北京理工大学 | Delay test method for video image processing system |
| CN102316357A (en) * | 2011-09-09 | 2012-01-11 | 华南理工大学 | Non-intrusive single-ended acquired video end-to-end time delay measuring method and device |
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