CN112584132A - Device and method for measuring delay time between cameras in different wave bands - Google Patents
Device and method for measuring delay time between cameras in different wave bands Download PDFInfo
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Abstract
The invention provides a device and a method for measuring delay time between cameras in different wave bands, which are used for measuring the delay time between a first camera and a second camera with overlapped wave bands and comprise the following steps: a control module and a diode array; the diode array is used for switching a plurality of different coding patterns which are sequentially arranged according to the time sequence in real time according to a preset control instruction; and the control module is used for controlling the first camera and the second camera to shoot the coding patterns displayed by the diode array at the same time so as to generate a first coding image and a second coding image, and further analyzing the time difference between the first coding image and the second coding image according to the control instruction. The invention can accurately measure the delay among the cameras in different wave bands, can ensure that the precision and the exposure time are in one order of magnitude, and can reduce the deviation of the camera delay on picture acquisition in a certain range.
Description
Technical Field
The invention relates to camera delay measurement, in particular to a device and a method for measuring delay time between cameras in different wave bands.
Background
The camera shutter delay is an important parameter of the camera, which reflects the speed of the camera's reaction from the pressing of the shutter to the completion of capturing an image. However, in the motion photography, for a fast moving object, the delay of the camera may miss the acquisition of the best image, which brings more difficulty to the post-processing of the image. In practical applications, the delay time of cameras in different bands or different models is different, and the acquired images are also different, so that it cannot be determined which camera acquires more accurate images, and the exposure time of the camera is in the order of milliseconds, which increases the difficulty in accurately acquiring images.
In practical applications, sometimes two different cameras are used to shoot the same object at the same time, and it is necessary to accurately determine the time interval between the two cameras, that is, it is important to determine the synchronization information acquired between the two cameras.
The current camera delay measurement method is based on a single-chip microcomputer counter to measure the delay time of a camera with one waveband, and cannot measure the delay time of cameras with different models or different wavebands. The image processing algorithm uses the pictures acquired by the cameras, and if the pictures acquired by the cameras in different wave bands have different deviations, the shot pictures closer to the real pictures cannot be determined, so that the error of the post-processing result is increased. The switching speed of the diodes is very fast, and the frequency of the diodes reaches a microsecond level so far, so that the diode array can be constructed into a millisecond watch or a microsecond watch by adopting a certain coding real-time switching display.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for accurately measuring the delay between cameras in different wave bands.
The device for measuring the delay time between the cameras in different wave bands is used for measuring the delay time between the first camera and the second camera with overlapped wave bands, and comprises the following components: a control module and a diode array;
the diode array is used for switching a plurality of different coding patterns which are sequentially arranged according to a time sequence in real time according to a preset control instruction;
the control module is used for controlling the first camera and the second camera to shoot the coding patterns displayed by the diode array at the same time so as to generate a first coding image and a second coding image, and further analyzing the time difference between the first coding image and the second coding image according to the control instruction.
Preferably, the system further comprises an image processing module;
the image processing module is configured to identify the first encoded image and the second encoded image to determine a first encoded pattern corresponding to the first encoded image and a second encoded pattern corresponding to the second encoded image, and further analyze a time difference between the first encoded pattern and the second encoded pattern according to the control instruction.
Preferably, the wavelength band of the diode array is located within the overlapping wavelength band of the first camera and the second camera.
Preferably, the switching frequency of the coding pattern is in the order of milliseconds or microseconds.
The method for measuring the delay time between the cameras in different wave bands is used for measuring the first camera and the second camera with overlapped wave bands, and comprises the following steps:
step S1: controlling a plurality of different coding patterns which are sequentially arranged according to the time sequence to switch in the diode array in real time according to a preset control instruction;
step S2: controlling a first camera and a second camera to shoot the diode array at the same time so as to generate a first coded image and a second coded image;
step S3: and analyzing the time difference between the first coded image and the second coded image according to the control instruction.
The device for measuring the delay time between the cameras in different wave bands is used for measuring the first camera and the second camera which do not have overlapped wave bands, and comprises the following steps: the diode array comprises a control module, a first diode array and a second diode array;
the first diode array and the second diode array are respectively used for switching a plurality of different coding patterns which are sequentially arranged according to a preset control instruction in real time;
the control module is used for controlling the first camera and the second camera to shoot the first diode array and the second diode array simultaneously and respectively so as to generate a first coded image and a second coded image, and then the time difference between the first coded image and the second coded image is analyzed according to the control instruction.
Preferably, the system further comprises an image processing module;
the image processing module is configured to identify according to the first encoded image and the second encoded image to determine a first encoded pattern corresponding to the first encoded image and a second encoded pattern corresponding to the second encoded image, and further analyze a time difference between the first encoded pattern and the second encoded pattern according to the control instruction.
Preferably, the wavelength band of the first diode array is within the wavelength band of the first camera;
the wavelength band of the second diode array is located within the wavelength band of the second camera.
Preferably, the switching frequency of the coding pattern is in the order of milliseconds or microseconds.
The method for measuring the delay time between the cameras in different wave bands is used for measuring the delay time between the first camera and the second camera without overlapping wave bands, and comprises the following steps:
step S1: controlling a plurality of different coding patterns which are sequentially arranged according to time sequence to respectively switch on the first diode array and the second diode array in real time according to a preset control instruction;
step S2: controlling the first camera and the second camera to shoot the first diode array and the second diode array simultaneously and respectively so as to generate a first coded image and a second coded image;
step S3: and resolving the time difference between the first coded image and the second coded image according to a control instruction.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, a plurality of different coding patterns which are sequentially arranged according to a time sequence are switched in real time through a control instruction, so that the first camera and the second camera are controlled to simultaneously shoot the diode array to generate a first coding image and a second coding image, and the time difference between the first coding image and the second coding image is analyzed according to the control instruction, so that the delay among cameras in different wave bands can be accurately measured, the precision and the exposure time can be in one order of magnitude, and the deviation of the camera delay on picture acquisition can be reduced in a certain range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts. Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a block diagram of an apparatus for measuring delay times between cameras in different bands according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating steps of a method for measuring delay times between cameras in different bands according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an initial encoded image of a diode array in an embodiment of the invention;
FIG. 4 is a diagram of a first encoded image of a diode array in an embodiment of the invention;
FIG. 5 is a diagram of a second encoded image of a diode array in an embodiment of the invention;
FIG. 6 is a block diagram of an apparatus for measuring delay times between cameras in different bands according to a variation of the present invention;
FIG. 7 is a flowchart illustrating steps of a method for measuring delay times between cameras in different bands according to a variation of the present invention;
FIG. 8 is a schematic diagram of an initial encoded image of a diode array in accordance with a variation of the present invention;
FIG. 9 is a diagram of a first encoded image of a diode array in accordance with a variation of the present invention;
FIG. 10 is a diagram of a second encoded image of a diode array in accordance with a variation of the present invention;
FIG. 11 is a flowchart illustrating steps of a method for measuring delay times between cameras in different bands according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
The invention provides a device for measuring delay time between cameras in different wave bands, and aims to solve the problems in the prior art.
The following describes the technical solutions of the present invention and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of an apparatus for measuring delay times between cameras in different wavelength bands according to an embodiment of the present invention, and as shown in fig. 1, the apparatus for measuring delay times between cameras in different wavelength bands provided by the present invention is used for measuring delay times between a first camera and a second camera having overlapping wavelength bands, and includes: the device comprises an image processing module, a control module and a diode array;
the diode array is used for switching a plurality of different coding patterns which are sequentially arranged according to a time sequence in real time according to a preset control instruction;
the control module is used for controlling the first camera and the second camera to shoot the coding patterns displayed by the diode array at the same time so as to generate a first coding image and a second coding image, and further analyzing the time difference between the first coding image and the second coding image according to the control instruction.
The image processing module is configured to identify the first encoded image and the second encoded image to determine a first encoded pattern corresponding to the first encoded image and a second encoded pattern corresponding to the second encoded image, and further analyze a time difference between the first encoded pattern and the second encoded pattern according to the control instruction.
In the embodiment of the present invention, the image processing module may be provided as a part of the control module, or the image processing module and the control module may be provided as separate modules, respectively. The control instruction comprises an instruction for controlling the plurality of coding patterns to be displayed in sequence and a time difference between two coding patterns adjacent in time.
In the embodiment of the invention, the wave bands of the diode array are located in the overlapped wave bands of the first camera and the second camera. The switching frequency of the coding pattern is in the order of milliseconds or microseconds.
Fig. 2 is a flowchart illustrating steps of a method for measuring delay times between cameras in different wavelength bands according to an embodiment of the present invention, and as shown in fig. 2, the method for measuring delay times between cameras in different wavelength bands provided by the present invention is used for measuring a first camera and a second camera having overlapping wavelength bands, and includes the following steps:
step S1: switching a plurality of different coding patterns which are sequentially arranged according to time sequence in a diode array in real time according to a preset control instruction;
step S2: controlling a first camera and a second camera to shoot the diode array at the same time so as to generate a first coded image and a second coded image;
step S3: and analyzing the time difference between the first coded image and the second coded image according to the control instruction.
When the device for measuring the delay time between the cameras in different wave bands provided by the invention is used for measuring the delay time between the first camera and the second camera with overlapped wave bands, diode arrays made of LEDs are adopted for the first camera with the wave band of 500 nm-700 nm and the second camera with the wave band of 600 nm-800 nm. Fig. 3 is a schematic diagram of an initial encoded image of a diode array according to an embodiment of the present invention, and as shown in fig. 3, the diode array is a diode array of any one of two overlapping bands, and the diode array is encoded in binary. After the first camera, the second camera and the diode array are simultaneously started, a first coded image displayed by the diode array acquired by the first camera is shown in fig. 4, and a second coded image displayed by the diode array adopted by the second camera is shown in fig. 5. The first coded image and the second coded image are saved, and then the corresponding diode code T1 or diode code T2 is identified in the first coded image and the second coded image, the diode code T1 or diode code T2 corresponds to the shooting time, so that the time delay between two cameras in different wave bands can be calculated.
Fig. 6 is a schematic block diagram of an apparatus for measuring delay times between cameras in different wavelength bands according to a variation of the present invention, and as shown in fig. 6, the apparatus for measuring delay times between cameras in different wavelength bands provided by the present invention is used for measuring a first camera and a second camera without overlapping wavelength bands, and includes: the device comprises an image processing module, a control module, a first diode array and a second diode array;
the first diode array and the second diode array are respectively used for switching a plurality of different coding patterns which are sequentially arranged according to a preset control instruction in real time;
the control module is used for controlling the first camera and the second camera to shoot the first diode array and the second diode array simultaneously and respectively so as to generate a first coded image and a second coded image, and further analyzing a time difference between the first coded image and the second coded image according to the control instruction;
the image processing module is configured to identify according to the first encoded image and the second encoded image to determine a first encoded pattern corresponding to the first encoded image and a second encoded pattern corresponding to the second encoded image, and further analyze a time difference between the first encoded pattern and the second encoded pattern according to the control instruction.
In the embodiment of the present invention, the image processing module may be provided as a part of the control module, or the image processing module and the control module may be provided as separate modules, respectively.
In an embodiment of the invention, the wavelength band of the first diode array is located within the wavelength band of the first camera; the wavelength band of the second diode array is located within the wavelength band of the second camera. The switching frequency of the coding pattern is in the order of milliseconds or microseconds.
Fig. 4 is a flowchart illustrating steps of a method for measuring delay times between cameras in different bands according to an embodiment of the present invention, and as shown in fig. 4, the method for measuring delay times between cameras in different bands provided by the present invention is used for measuring delay times between a first camera and a second camera without overlapping bands, and includes the following steps:
step S1: switching a plurality of different coding patterns which are sequentially arranged according to time sequence on a first diode array and a second diode array in real time according to a preset control instruction;
step S2: controlling the first camera and the second camera to shoot the first diode array and the second diode array simultaneously and respectively so as to generate a first coded image and a second coded image;
step S3: and resolving the time difference between the first coded image and the second coded image according to a control instruction.
When the device for measuring the delay time between the cameras in different wave bands provided by the invention is used for measuring the delay time between the first camera and the second camera which do not have overlapped wave bands, for example, for the first camera with the wave band of 400 nm-550 nm and the second camera with the wave band of 600 nm-800 nm, a diode array made of LEDs is adopted. Fig. 8 is a schematic diagram of an initial encoded image of a diode array according to a modification of the present invention, where, as shown in fig. 8, the number of the diode arrays is two, one of the diode arrays is located in a wavelength band of the first camera, and the other diode array is located in a wavelength band of the first camera, and the diode arrays are encoded in binary codes. After the first camera, the second camera and the two diode arrays are simultaneously started, a first coded image displayed by one diode array acquired by the first camera is shown in fig. 9, and a second coded image displayed by the other diode array adopted by the second camera is shown in fig. 10. The first coded image and the second coded image are saved, and then the corresponding diode code T1 or diode code T2 is identified in the first coded image and the second coded image, the diode code T1 or diode code T2 corresponds to the shooting time, so that the time delay between two cameras in different wave bands can be calculated.
When the device for measuring the delay time between the cameras in different wave bands provided by the invention is realized, the embodiment and the modification can be integrated, and the specific use of the device for measuring the delay time between the cameras in different wave bands provided by the invention comprises the following steps:
step S1: acquiring wave bands of a first camera and a second camera to be measured, judging whether the wave bands of the first camera and the second camera to be measured are overlapped, executing a step S2 when the wave bands of the first camera and the second camera are overlapped, and executing a step S3 when the wave bands of the first camera and the second camera are not overlapped;
step S2: switching a plurality of different coding patterns which are sequentially arranged according to a time sequence in a diode array in real time according to a preset control instruction, and controlling a first camera and a second camera to shoot the diode array at the same time so as to generate a first coding image and a second coding image;
step S3: switching a plurality of different coding patterns which are sequentially arranged according to a time sequence on a first diode array and a second diode array in real time according to a preset control instruction, and controlling the first camera and the second camera to shoot the first diode array and the second diode array simultaneously and respectively so as to generate a first coding image and a second coding image;
step S4: and resolving the time difference between the first coded image and the second coded image according to a control instruction.
In the embodiment of the invention, a plurality of different coding patterns which are sequentially arranged according to a time sequence are switched in real time through a control instruction, so that the first camera and the second camera are controlled to shoot the diode array at the same time to generate a first coding image and a second coding image, and the time difference between the first coding image and the second coding image is analyzed according to the control instruction, so that the delay between cameras in different wave bands can be accurately measured, the precision and the exposure time can be in one order of magnitude, and the deviation of the camera delay on picture acquisition can be reduced in a certain range.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
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Application publication date: 20210330 |