CN113891065B - Single-frame image transmission delay measurement method and system - Google Patents
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Abstract
The embodiment of the application provides a single-frame image transmission delay measurement method and a single-frame image transmission delay measurement system, which use a GNSS module with the simplest and lowest cost, utilize a signal output by a GNSS positioning module as a synchronous signal of a video transmission system, access GPIO ports at an image coding end and a decoding end, simultaneously lead out the GPIO ports at the image coding end as state output, and additionally add an oscilloscope, thereby being capable of accurately measuring the accurate delay from coding, transmission and decoding of a frame of image.
Description
Technical Field
The embodiment of the application relates to the technical field of intelligent driving, in particular to a single-frame image transmission delay measurement method and system.
Background
Recently, video codec and transmission has become a hot spot problem in the video field. Video transmission systems generally include an encoding side (image acquisition and encoding), a transmitting side (transmitting and receiving side), and a decoding side (decoding and displaying). The coding and decoding transmission delay of the video or the image is a key index for checking the video transmission system. One common measurement method is that the encoding end performs image acquisition by aligning to a high-precision millisecond timer, and then the decoding end decodes the image through communication transmission (wired or wireless). In the process, a high-speed camera is used for simultaneously aligning the millisecond timer with the image display at the decoding end, photographing is carried out, and the difference value of the millisecond counter is displayed by comparing the millisecond counter with the image display at the decoding end, namely the delay of the video transmission system. The method of measurement is limited by expensive high-speed cameras and has low precision.
Disclosure of Invention
The embodiment of the application provides a single-frame image transmission delay measurement method and a single-frame image transmission delay measurement system, which are used for solving the problems that in the prior art, delay measurement of a video transmission system is limited by an expensive high-speed camera and the precision is not high.
In a first aspect, an embodiment of the present application provides a method for measuring a transmission delay of a single frame image, including:
when the encoder receives a pulse per second PPS sent by a GNSS positioning module of a global navigation satellite system at the moment T0, one frame of image data of the CMOS image sensor is taken for encoding and then sent to a decoder;
when the decoder receives the second pulse PPS sent by the GNSS positioning module at the time T0, the decoder receives data and acquires the data to be sent to the time T2 when the display finishes decoding;
the transmission delay from encoding to decoding is determined to be T2-T0.
Preferably, before the encoder receives the pulse per second PPS transmitted by the global navigation satellite system GNSS at time T0, the method further includes:
and simultaneously starting a decoder and an encoder, wherein the decoder and the encoder receive the PPS sent by the GNSS positioning module and serve as synchronous signals.
Preferably, the GPIO ports of the decoder and the encoder are both connected to a GNSS positioning module, and the GNSS positioning module is configured to send PPS to the decoder and the encoder.
Preferably, the encoder receives a second pulse PPS sent by a GNSS positioning module of the global navigation satellite system at time T0, and specifically includes:
when the encoder receives the PPS, measuring a pulse clock T0 of the PPS through an oscilloscope, and receiving an interrupt by the encoder;
the decoder receives the second pulse PPS sent by the GNSS positioning module at the moment T0, and specifically comprises the following steps:
when the encoder receives the PPS, the pulse clock T0 of the PPS is measured by an oscilloscope, and a decoder starts a receiver to receive data.
Preferably, the decoder receives the data, acquires the data, and sends the data to the display at the time T2 when the decoding is completed, and specifically includes:
after the decoder decodes the data, the GPIO port outputs a high pulse signal, the oscilloscope counts as T1, and when the data is sent to the display for decoding, the time of displaying the image by the display is measured by the oscilloscope as T2.
In a second aspect, an embodiment of the present application provides a single frame image transmission delay measurement system, including an encoding end, a decoding end and a measurement module; the decoding end comprises a decoder and a first GNSS positioning module connected with the decoder, and the encoding end comprises an encoder and a second GNSS positioning module connected with the encoder;
when the encoder receives the second pulse PPS sent by the first GNSS positioning module at the moment of T0, taking one frame of image data of the CMOS image sensor for encoding, and sending the encoded frame of image data to the decoder;
when the decoder receives the second pulse PPS sent by the second GNSS positioning module at the time of T0, the decoder receives data and acquires the data to be sent to the time T2 when the display finishes decoding;
and the measurement module is used for determining the transmission delay from encoding to decoding as T2-T0.
Preferably, the decoder is further connected with a CMOS sensor and a transmitting module; the CMOS sensor is used for transmitting image data to the encoder, and the transmitting module is used for transmitting the data encoded by the encoder to the encoding end;
the encoder is also connected with a receiving module and a display; the receiving module is used for receiving the data sent by the encoder; the display is used for decoding and displaying data.
Preferably, the display is further connected with a third GNSS module.
Preferably, the display, the decoder and the encoder are all provided with GPIO ports, and the GPIO ports are connected with an oscilloscope; the oscilloscope is used for measuring a pulse clock to be T0 when the encoder receives the second pulse PPS sent by the first GNSS positioning module, receiving a GPIO port of the encoder to output a high pulse signal after decoding data is completed, measuring the pulse clock to be T1, and measuring time T2 when the data is sent to the display to be decoded.
The single-frame image transmission delay measurement method and system provided by the embodiment of the application use the simplest and lowest-cost GNSS module, utilize the signal output by the GNSS positioning module as the synchronous signal of the video transmission system, access the GPIO ports at the image coding end and the decoding end, simultaneously lead out the GPIO ports at the image coding end as the state output, and additionally add an oscilloscope, thus being capable of accurately measuring the accurate delay from coding, transmission and decoding of one frame of image.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a single frame image transmission delay measurement method according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a single-frame image transmission delay measurement system according to an embodiment of the present application;
fig. 3 is a timing chart of delay measurement according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The coding and decoding transmission delay of the video or the image is a key index for checking the video transmission system. One common measurement method is that the encoding end performs image acquisition by aligning to a high-precision millisecond timer, and then the decoding end decodes the image through communication transmission (wired or wireless). In the process, a high-speed camera is used for simultaneously aligning the millisecond timer with the image display at the decoding end, photographing is carried out, and the difference value of the millisecond counter is displayed by comparing the millisecond counter with the image display at the decoding end, namely the delay of the video transmission system. The method of measurement is limited by expensive high-speed cameras and has low precision.
Therefore, the embodiment of the application provides a single-frame image transmission delay measurement method and system, which uses a simplest and lowest-cost GNSS module, uses a signal output by a GNSS positioning module as a PPS signal as a synchronization signal of a video transmission system, accesses GPIO ports at an image coding end and a decoding end, and simultaneously leads out the GPIO ports at the image coding end to serve as state output, and additionally adds an oscilloscope, so that the accurate delay from coding, transmission and decoding of a frame of image can be accurately measured. The following description and description will be made with reference to various embodiments.
Fig. 1 is a flow chart of a single-frame image transmission delay measurement method provided by an embodiment of the present application, fig. 2 is a schematic structural diagram of a single-frame image transmission delay measurement system provided by an embodiment of the present application, fig. 3 is a delay measurement timing chart provided by an embodiment of the present application, and referring to fig. 1 to fig. 3, the method includes:
when the encoder receives a pulse per second PPS sent by a GNSS positioning module of a global navigation satellite system at the moment T0, one frame of image data of the CMOS image sensor is taken for encoding and then sent to a decoder;
when the decoder receives the second pulse PPS sent by the GNSS positioning module at the time T0, the decoder receives data and acquires the data to be sent to the time T2 when the display finishes decoding;
the delay time from encoding, transmission to decoding is calculated as: t=t2-T0.
In this embodiment, clock synchronization is achieved through the GNSS, and by reading GNSS data of the global navigation satellite system GNSS to obtain a pulse clock included in the data and determining whether clocks of the decoder and the encoder are consistent, the problem that the GNSS data cannot be obtained in real time can be solved, and the problem that a plurality of application programs call the GNSS data to generate conflicts is avoided.
Based on the foregoing embodiment, as a preferred implementation, before the encoder receives the second pulse PPS sent by the global navigation satellite system GNSS at time T0, the method further includes:
and simultaneously starting a decoder and an encoder, wherein the decoder and the encoder receive the PPS sent by the GNSS positioning module and serve as synchronous signals.
Specifically, when the PPS clock pulse comes, the oscilloscope measures the pulse clock to be T0, the encoder receives the interrupt, takes a frame of image data of the CMOS sensor, encodes, sends the encoded frame of image data to the receiving module, and when the PPS clock pulse comes, the oscilloscope measures the pulse clock to be T0, and the decoder starts the receiver to receive the data.
The signal output by the GNSS positioning module is used as a synchronous signal of a video transmission system, so that the slave code, transmission and accurate delay of decoding of one frame of image can be accurately measured.
Based on the foregoing embodiment, as a preferred implementation manner, the GPIO ports of the decoder and the encoder are connected to a GNSS positioning module, and the GNSS positioning module is configured to send PPS to the decoder and the encoder.
In this embodiment, the signal output by the GNSS positioning module is used as the synchronization signal of the PPS signal and is connected to the GPIO ports at the image encoding end and the decoding end, and meanwhile, the GPIO ports are led out from the image encoding end and are used as the state output, and an oscilloscope is additionally added, so that the slave encoding, transmission and accurate delay from decoding of a frame of image can be accurately measured.
Based on the foregoing embodiment, as a preferred implementation manner, the encoder receives the second pulse PPS sent by the GNSS positioning module at time T0, and specifically includes:
when the encoder receives the PPS, measuring a pulse clock T0 of the PPS through an oscilloscope, and receiving an interrupt by the encoder;
the decoder receives the second pulse PPS sent by the GNSS positioning module at the moment T0, and specifically comprises the following steps:
when the encoder receives the PPS, the pulse clock T0 of the PPS is measured by an oscilloscope, and a decoder starts a receiver to receive data.
Based on the foregoing embodiment, as a preferred implementation manner, the decoder receives the data, and obtains the time T2 when the data is sent to the display after decoding is completed, and specifically includes:
after the decoder decodes the data, the GPIO port outputs a high pulse signal, the oscilloscope counts as T1, and when the data is sent to the display for decoding, the time of displaying the image by the display is measured by the oscilloscope as T2.
In one embodiment, the embodiment of the application also provides a single-frame image transmission delay measurement system, as shown in fig. 2, which comprises an encoding end, a decoding end and a measurement module; the decoding end comprises a decoder and a first GNSS positioning module connected with the decoder, and the encoding end comprises an encoder and a second GNSS positioning module connected with the encoder;
when the encoder receives the second pulse PPS sent by the first GNSS positioning module at the moment of T0, taking one frame of image data of the CMOS image sensor for encoding, and sending the encoded frame of image data to the decoder;
when the decoder receives the second pulse PPS sent by the second GNSS positioning module at the time of T0, the decoder receives data and acquires the data to be sent to the time T2 when the display finishes decoding;
and the measurement module is used for determining the transmission delay from encoding to decoding as T2-T0.
Furthermore, the decoder is also connected with a CMOS sensor and a transmitting module; the CMOS sensor is used for transmitting image data to the encoder, and the transmitting module is used for transmitting the data encoded by the encoder to the encoding end; the encoder is also connected with a receiving module and a display; the receiving module is used for receiving the data sent by the encoder; the display is used for decoding and displaying data.
Further, the display is also connected with a third GNSS module.
Furthermore, the display, the decoder and the encoder are all provided with GPIO ports, and the GPIO ports are connected with an oscilloscope; the oscilloscope is used for measuring a pulse clock to be T0 when the encoder receives the second pulse PPS sent by the first GNSS positioning module, receiving a GPIO port of the encoder to output a high pulse signal after decoding data is completed, measuring the pulse clock to be T1, and measuring time T2 when the data is sent to the display to be decoded.
It can be understood that the single-frame image transmission delay measurement system provided by the present application corresponds to the single-frame image transmission delay measurement method provided in the foregoing embodiments, and specifically how to use the system to perform single-frame image transmission delay measurement may refer to relevant technical features of the single-frame image transmission delay measurement method in the foregoing embodiments, which are not described herein again.
In summary, the embodiment of the application provides a single-frame image transmission delay measurement method and system, which uses the simplest and lowest-cost GNSS module, uses the signal output by the GNSS positioning module as the PPS signal as the synchronization signal of the video transmission system, accesses the GPIO ports at the image coding end and the decoding end, and simultaneously leads out the GPIO ports at the image coding end as the state output, and additionally adds an oscilloscope, thus being capable of accurately measuring the accurate delay from coding, transmission and decoding of one frame of image.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (methods), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. The single-frame image transmission delay measurement method is characterized by comprising the following steps of:
when the encoder receives a pulse per second PPS sent by a GNSS positioning module of a global navigation satellite system at the moment T0, one frame of image data of the CMOS image sensor is taken for encoding and then sent to a decoder;
when the decoder receives the second pulse PPS sent by the GNSS positioning module at the time T0, the decoder receives data and acquires the data to be sent to the time T2 when the display finishes decoding;
determining the transmission delay from encoding to decoding as T2-T0;
the encoder receives a second pulse PPS sent by a GNSS positioning module of a global navigation satellite system at the moment T0, and specifically comprises the following steps:
when the encoder receives the PPS, measuring a pulse clock T0 of the PPS through an oscilloscope, and receiving an interrupt by the encoder;
the decoder receives the second pulse PPS sent by the GNSS positioning module at the moment T0, and specifically comprises the following steps:
when the decoder receives the PPS, the pulse clock T0 of the PPS is measured by an oscilloscope, and the decoder starts a receiver to receive data;
the decoder receives the data, acquires the data and sends the data to the display at the time T2 when the decoding is finished, and specifically comprises the following steps:
after the decoder decodes the data, the GPIO port outputs a high pulse signal, the oscilloscope counts as T1, and when the data is sent to the display for decoding, the time of displaying the image by the display is measured by the oscilloscope as T2.
2. The method for measuring single frame image transmission delay according to claim 1, wherein before the encoder receives the second pulse PPS transmitted by the global navigation satellite system GNSS at time T0, the method further comprises:
and simultaneously starting a decoder and an encoder, wherein the decoder and the encoder receive the PPS sent by the GNSS positioning module and serve as synchronous signals.
3. The method according to claim 1, wherein the GPIO ports of the decoder and the encoder are connected to a GNSS positioning module, and the GNSS positioning module is configured to send PPS to the decoder and the encoder.
4. The single-frame image transmission delay measurement system is characterized by comprising an encoding end, a decoding end and a measurement module; the decoding end comprises a decoder and a first GNSS positioning module connected with the decoder, and the encoding end comprises an encoder and a second GNSS positioning module connected with the encoder;
when the encoder receives the second pulse PPS sent by the first GNSS positioning module at the moment of T0, taking one frame of image data of the CMOS image sensor for encoding, and sending the encoded frame of image data to the decoder;
when the decoder receives the second pulse PPS sent by the second GNSS positioning module at the time of T0, the decoder receives data and acquires the data to be sent to the time T2 when the display finishes decoding;
the measuring module determines the transmission delay from encoding to decoding to be T2-T0;
the encoder receives a second pulse PPS sent by a GNSS positioning module of a global navigation satellite system at the moment T0, and specifically comprises the following steps:
when the encoder receives the PPS, measuring a pulse clock T0 of the PPS through an oscilloscope, and receiving an interrupt by the encoder;
the decoder receives the second pulse PPS sent by the GNSS positioning module at the moment T0, and specifically comprises the following steps:
when the decoder receives the PPS, the pulse clock T0 of the PPS is measured by an oscilloscope, and the decoder starts a receiver to receive data;
the decoder receives the data, acquires the data and sends the data to the display at the time T2 when the decoding is finished, and specifically comprises the following steps:
after the decoder decodes the data, the GPIO port outputs a high pulse signal, the oscilloscope counts as T1, and when the data is sent to the display for decoding, the time of displaying the image by the display is measured by the oscilloscope as T2.
5. The single frame image transmission delay measurement system of claim 4 wherein the decoder is further coupled to a CMOS sensor and a transmit module; the CMOS sensor is used for transmitting image data to the encoder, and the transmitting module is used for transmitting the data encoded by the encoder to the encoding end;
the encoder is also connected with a receiving module and a display; the receiving module is used for receiving the data sent by the encoder; the display is used for decoding and displaying data.
6. The single frame image transmission delay measurement system of claim 4 wherein the display is further coupled to a third GNSS module.
7. The single frame image transmission delay measurement system of claim 4 wherein the display, decoder and encoder are each provided with a GPIO port, the GPIO port being connected with an oscilloscope; the oscilloscope is used for measuring a pulse clock to be T0 when the encoder receives the second pulse PPS sent by the first GNSS positioning module, receiving a GPIO port of the encoder to output a high pulse signal after decoding data is completed, measuring the pulse clock to be T1, and measuring time T2 when the data is sent to the display to be decoded.
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| CN214014395U (en) * | 2021-06-08 | 2021-08-20 | 北京科技大学 | High-precision video transmission delay test system |
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