CN112468887A - Thermal imaging data transmission method and device and thermal imaging equipment - Google Patents

Thermal imaging data transmission method and device and thermal imaging equipment Download PDF

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Publication number
CN112468887A
CN112468887A CN201910840012.8A CN201910840012A CN112468887A CN 112468887 A CN112468887 A CN 112468887A CN 201910840012 A CN201910840012 A CN 201910840012A CN 112468887 A CN112468887 A CN 112468887A
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China
Prior art keywords
thermal imaging
data
rtp
imaging data
frame
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Chinese (zh)
Inventor
周瑞卿
汤云飞
肖振华
王晓敏
郭佳琦
林越
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Hangzhou Hikmicro Sensing Technology Co Ltd
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Hangzhou Hikmicro Sensing Technology Co Ltd
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Priority to CN201910840012.8A priority Critical patent/CN112468887A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/643—Communication protocols
    • H04N21/6437—Real-time Transport Protocol [RTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information
    • H04N5/33—Transforming infrared radiation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The embodiment of the invention provides a transmission method and a device of thermal imaging data and thermal imaging equipment, wherein the method comprises the following steps: after RTSP connection is established between the thermal imaging equipment and a terminal, thermal imaging data are collected, and each frame of collected thermal imaging data is subjected to sub-packet processing according to the structure of the thermal imaging data to obtain a plurality of RTP messages; the thermal imaging equipment sequentially sends the plurality of RTP messages to a terminal, and the terminal analyzes and splices the plurality of RTP messages and restores the RTP messages to obtain each frame of thermal imaging data. Through the process, real-time uncompressed streaming of the RTSP-RTP-based thermal imaging data is realized. Since the RTSP and the RTP are standard real-time transmission protocols, the thermal imaging device can transmit the thermal imaging data to any type of terminal without integrating any plug-in or extension program at the terminal side, and the universality of thermal imaging data transmission is improved.

Description

Thermal imaging data transmission method and device and thermal imaging equipment
Technical Field
The embodiment of the invention relates to the technical field of thermal imaging, in particular to a thermal imaging data transmission method and device and thermal imaging equipment.
Background
The thermal imaging technology, also called infrared thermal imaging technology, detects infrared specific wave band signals of object heat radiation by using a photoelectric technology, converts the signals into images and graphs which can be distinguished by human vision, and further calculates temperature values, so that human can see the temperature distribution condition of the object surface.
After the thermal imaging device acquires the thermal imaging data, the thermal imaging data needs to be transmitted to the terminal, so that a user can view the thermal imaging data through the terminal. Currently, the transmission of thermal imaging data is typically implemented using proprietary protocols. Illustratively, the thermal imaging device adds a private Protocol header to a header of the thermal imaging data, and transmits the header to the terminal through a Transmission Control Protocol (TCP).
However, in the above transmission method, due to the fact that the proprietary protocol is adopted for implementation, the proprietary protocols corresponding to different thermal imaging devices may be different, and when the thermal imaging data collected by a plurality of thermal imaging devices needs to be viewed on the terminal, plug-ins or extension programs corresponding to a plurality of proprietary protocol libraries need to be integrated on the terminal respectively. In addition, because hardware platforms or operating systems of different terminals are different, when thermal imaging data needs to be transmitted to a plurality of terminals, plug-ins or extension programs corresponding to the hardware platforms or the operating systems of the terminals need to be provided for the terminals respectively. Therefore, the current transmission of thermal imaging data does not have universality.
Disclosure of Invention
The embodiment of the invention provides a transmission method and device of thermal imaging data and thermal imaging equipment, which are used for improving the universality of thermal imaging data transmission.
In a first aspect, an embodiment of the present invention provides a method for transmitting thermal imaging data, including:
the method comprises the steps that thermal imaging equipment collects thermal imaging data after establishing real-time streaming protocol (RTSP) connection with a terminal;
the thermal imaging equipment performs sub-packet processing on each frame of acquired thermal imaging data according to the structure of the thermal imaging data to obtain a plurality of real-time transport protocol (RTP) messages, wherein the structure of the thermal imaging data comprises a frame header and a frame payload;
the thermal imaging equipment sequentially sends the plurality of RTP messages to the terminal so that the terminal analyzes and splices the plurality of RTP messages to obtain each frame of thermal imaging data.
Optionally, the thermal imaging device performs packet processing on each frame of acquired thermal imaging data according to the structure of the thermal imaging data to obtain a plurality of RTP packets, including:
the thermal imaging equipment takes the frame header of each frame of collected thermal imaging data as effective load data, and encapsulates an RTP header to obtain a first RTP message;
the thermal imaging equipment divides the frame payload of each frame of thermal imaging data by taking a preset data volume as a unit to obtain N parts of data; the data volume of each data in the first N-1 data shares is equal to the preset data volume, and the data volume of the Nth data share is smaller than or equal to the preset data volume;
and the thermal imaging equipment takes each piece of data as payload data respectively, and encapsulates the RTP header respectively to obtain N second RTP messages.
Optionally, the RTP header includes a flag bit;
the value of the flag bit in the RTP header corresponding to the first RTP packet and the first N-1 RTP packets is a first numerical value, the value of the flag bit in the RTP header corresponding to the nth RTP packet is a second numerical value, and the first numerical value is different from the second numerical value.
Optionally, the thermal imaging device, before segmenting the frame payload of each frame of thermal imaging data by using a preset data size as a unit to obtain N pieces of data, further includes:
determining the maximum message segment length MSS of the RTP message according to the maximum transmission unit of a data link layer, the length of an IP header corresponding to an Internet protocol address IP message, the length of a TCP header corresponding to a transmission control protocol TCP message or the length of a UDP header corresponding to a user data protocol UDP message;
and determining the preset data volume according to the MSS of the RTP message and the length of the RTP header.
Optionally, the establishing, by the thermal imaging device, a real-time streaming protocol RTSP connection with the terminal includes:
the thermal imaging device sends a candidate type to the terminal, wherein the candidate type is used for indicating the type of the thermal imaging data supported by the thermal imaging device, and the candidate type comprises: thermally imaging original code stream data and full screen temperature measurement data;
the thermal imaging equipment receives a target type from the terminal, wherein the target type is one of the candidate types, and the target type is used for indicating the type of thermal imaging data required to be acquired by the terminal;
the thermal imaging device acquires thermal imaging data, comprising:
the thermal imaging device collects thermal imaging data according to the target type.
Optionally, the method further includes:
and after the thermal imaging equipment receives the RTSP termination request sent by the terminal, the thermal imaging equipment responds to the RTSP termination request to stop collecting thermal imaging data and disconnects RTSP connection with the terminal.
In a second aspect, an embodiment of the present invention provides an apparatus for transmitting thermal imaging data, including:
the acquisition module is used for acquiring thermal imaging data after establishing real-time streaming protocol (RTSP) connection with the terminal;
the sub-packaging module is used for sub-packaging the acquired thermal imaging data of each frame according to the structure of the thermal imaging data to obtain a plurality of real-time transport protocol (RTP) messages, wherein the structure of the thermal imaging data comprises a frame header and a frame payload;
and the communication module is used for sequentially sending the plurality of RTP messages to the terminal so that the terminal analyzes and splices the plurality of RTP messages to obtain each frame of thermal imaging data.
Optionally, the packetization module is specifically configured to:
taking a frame header of each frame of collected thermal imaging data as effective load data, and encapsulating an RTP header to obtain a first RTP message;
segmenting the frame payload of each frame of thermal imaging data by taking a preset data volume as a unit to obtain N parts of data; the data volume of each data in the first N-1 data shares is equal to the preset data volume, and the data volume of the Nth data share is smaller than or equal to the preset data volume;
and respectively using each piece of data as effective load data, and respectively encapsulating the RTP header to obtain N second RTP messages.
Optionally, the RTP header includes a flag bit;
the value of the flag bit in the RTP header corresponding to the first RTP packet and the first N-1 RTP packets is a first numerical value, the value of the flag bit in the RTP header corresponding to the nth RTP packet is a second numerical value, and the first numerical value is different from the second numerical value.
Optionally, the packetization module is further configured to:
determining the maximum message segment length MSS of the RTP message according to the maximum transmission unit of a data link layer, the length of an IP header corresponding to an Internet protocol address IP message, the length of a TCP header corresponding to a transmission control protocol TCP message or the length of a UDP header corresponding to a user data protocol UDP message;
and determining the preset data volume according to the MSS of the RTP message and the length of the RTP header.
Optionally, the communication module is further configured to:
sending a candidate type to the terminal, the candidate type being used for indicating a type of thermal imaging data supported by the thermal imaging device, the candidate type comprising: thermally imaging original code stream data and full screen temperature measurement data;
receiving a target type from the terminal, wherein the target type is one of the candidate types, and the target type is used for indicating the type of thermal imaging data required to be acquired by the terminal;
the acquisition module is specifically configured to acquire thermal imaging data according to the target type.
Optionally, the communication module is further configured to:
and receiving an RTSP termination request sent by the terminal, responding to the RTSP termination request, stopping collecting thermal imaging data, and disconnecting RTSP connection with the terminal.
In a third aspect, an embodiment of the present invention provides a thermal imaging apparatus, including: memory, a processor and a computer program, the computer program being stored in the memory, the processor running the computer program to perform the method according to any of the first aspect.
In a fourth aspect, the present invention provides a computer-readable storage medium including a computer program, which when executed by a processor implements the method according to any one of the first aspect.
The embodiment of the invention provides a transmission method and a device of thermal imaging data and thermal imaging equipment, wherein the method comprises the following steps: after RTSP connection is established between the thermal imaging equipment and a terminal, thermal imaging data are collected, and each frame of collected thermal imaging data is subjected to sub-packet processing according to the structure of the thermal imaging data to obtain a plurality of RTP messages; the thermal imaging equipment sequentially sends the plurality of RTP messages to a terminal, and the terminal analyzes and splices the plurality of RTP messages and restores the RTP messages to obtain each frame of thermal imaging data. Through the process, real-time uncompressed streaming of the RTSP-RTP-based thermal imaging data is realized. Since the RTSP and the RTP are standard real-time transmission protocols, the thermal imaging device can transmit the thermal imaging data to any type of terminal without integrating any plug-in or extension program at the terminal side, and the universality of thermal imaging data transmission is improved.
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, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an application scenario in which an embodiment of the present invention is applicable;
FIG. 2 is a flow chart illustrating a method for transmitting thermal imaging data according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a message for transmitting thermal imaging data to a terminal according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of performing packetization processing on single-frame thermal imaging data according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a process of performing packetization processing on single-frame thermal imaging data according to an embodiment of the present invention;
FIG. 6 is an interaction diagram of a method for transmitting thermal imaging data according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a thermal imaging data transmission apparatus according to an embodiment of the present invention;
fig. 8 is a schematic hardware configuration diagram of a thermal imaging apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection 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.
Fig. 1 is a schematic view of an application scenario applicable to the embodiment of the present invention. As shown in fig. 1, the scenario includes: a thermal imaging device and a terminal. Among them, the thermal imaging device is a device for acquiring and outputting thermal imaging data, including but not limited to: thermal imagers, infrared thermal imagers, night vision devices, and the like. In one possible scenario, the thermal imaging device may also have the capability to process thermal imaging data. Illustratively, the thermal imaging device converts the collected thermal imaging raw code stream data into full-screen temperature measurement data. The terminal is a device for receiving and presenting thermal imaging data. Illustratively, a media client may be provided in the terminal, and the thermal imaging data is obtained from the thermal imaging device and displayed through the media client. The terminal can be a mobile phone, a desktop computer, a notebook computer, a platform computer and the like.
In fig. 1, the terminal is connected to the thermal imaging device via a network, and the thermal imaging device transmits the acquired thermal imaging data to the terminal, so that the user can view the thermal imaging data through the terminal. Currently, the transmission of thermal imaging data is typically implemented using proprietary protocols. Illustratively, the thermal imaging device adds a private protocol packet header to the header of the thermal imaging data, and transmits the header to the terminal through the TCP.
However, in the above transmission method, due to the fact that the proprietary protocol is adopted for implementation, the proprietary protocols corresponding to different thermal imaging devices may be different, and when the thermal imaging data collected by a plurality of thermal imaging devices needs to be viewed on the terminal, plug-ins or extension programs corresponding to a plurality of proprietary protocol libraries need to be integrated on the terminal respectively. In addition, because hardware platforms or operating systems of different terminals are different, when thermal imaging data needs to be transmitted to a plurality of terminals, plug-ins or extension programs corresponding to the hardware platforms or the operating systems of the terminals need to be provided for the terminals respectively. Therefore, the current transmission of thermal imaging data does not have universality.
In order to solve the above problem, an embodiment of the present invention provides a method for transmitting thermal imaging data, where a Real-Time Streaming Protocol (RTSP) is used in an application layer, and a Real-Time Transport Protocol (RTP) is used in a Transport layer to implement transmission of the thermal imaging data. Since the RTSP and the RTP are standard real-time transmission protocols, the thermal imaging device can transmit the thermal imaging data to any type of terminal without integrating any plug-in or extension program at the terminal side, and the universality of thermal imaging data transmission is improved.
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.
Fig. 2 is a schematic flow chart of a thermal imaging data transmission method according to an embodiment of the present invention. The method of the present embodiment is applicable to a thermal imaging apparatus as shown in fig. 1.
As shown in fig. 2, the method of the present embodiment includes:
s201: the thermal imaging device collects thermal imaging data after establishing a real-time streaming protocol (RTSP) connection with the terminal.
In this embodiment, the thermal imaging data is used as streaming media data, the thermal imaging data is transmitted from the thermal imaging data to the terminal in a streaming manner, and the terminal can receive the thermal imaging data and play the thermal imaging data at the same time. RTSP is an application layer protocol for controlling real-time streaming, and is one of the common protocols for realizing streaming.
And establishing RTSP connection between the thermal imaging equipment and the terminal. The RTSP connection is based on a C-S communication mode, in which the thermal imaging device acts as a media data server and the terminal acts as a media data client.
In this embodiment, the RTSP connection establishment between the thermal imaging device and the terminal may be performed by using an existing RTSP protocol-based connection establishment procedure. Illustratively, a message request and response mechanism is used between the client and the server to establish the RTSP connection.
In this embodiment, during the transmission of the thermal imaging data, the RTSP protocol is used in the application layer, and the RTP protocol is used in the transport layer, and may be based on TCP transmission or UDP transmission.
In this embodiment, after the thermal imaging device establishes RTSP connection with the terminal, thermal imaging data starts to be acquired. The thermal imaging data collected by the thermal imaging device can be thermal imaging original code stream data and can also be full-screen temperature measurement data. The thermal imaging raw code stream data may also be referred to as thermal imaging bare data, which refers to raw code stream data acquired by a thermal imaging device and not subjected to any processing. The full-screen temperature measurement data is temperature data which can be distinguished visually and is obtained by converting thermal imaging original code stream data.
S202: and the thermal imaging equipment performs sub-packet processing on each frame of acquired thermal imaging data according to the structure of the thermal imaging data to obtain a plurality of real-time transport protocol (RTP) messages, wherein the structure of the thermal imaging data comprises a frame header and a frame payload.
The acquisition parameters of the thermal imaging device include an acquisition resolution and a frame rate. Wherein the acquisition resolution refers to detector pixels of the thermal imaging device. Frame rate refers to the acquisition frequency of the thermal imaging device. The thermal imaging device collects data according to the frame rate supported by the thermal imaging device, and the collected data corresponds to one frame of thermal imaging data. The thermal imaging data has the characteristics of large single-frame data quantity and high frame rate.
The transmission method of the thermal imaging data is different from the transmission method of the audio and video data in the embodiment. For audio and video data, a data compression technology is usually adopted, that is, data compression is performed on the server side and data decompression is performed on the client side. In the embodiment of the invention, in order to ensure the high frame rate of the thermal imaging data, data compression is not carried out on the thermal imaging device side, and the thermal imaging data is transmitted without compression based on the streaming protocol.
Since the single frame data Size of the thermal imaging data is large, it is usually on the Megabyte (MB) level, that is, the single frame data Size of the thermal imaging data is much larger than the Maximum Segment length (MSS) of the RTP packet. Therefore, in this embodiment, each frame of thermal imaging data is subjected to packetization to obtain a plurality of RTP packets. Illustratively, each frame of thermal imaging data is packetized according to the length upper limit of the RTP packet, so that the length of each RTP packet obtained by packetization is smaller than or equal to the MSS of the RTP packet.
The RTP message comprises an RTP header and RTP load data. The RTP header is used to record the related information of the RTP packet, such as: protocol version, payload length, timestamp, etc. Recorded in the RTP payload data is a partial payload of the thermographic data.
In this embodiment, each frame of thermal imaging data is subjected to packetization processing according to the structure of the thermal imaging data. The structure of the thermal imaging data comprises a frame header and a frame payload, specifically, a packet mode can be adopted for the frame header, and a packet mode is adopted for the frame payload; different RTP headers may also be encapsulated for the frame header and frame payload, respectively. It can be understood that, there may be various embodiments in the process of performing packetization processing on each frame of thermal imaging data according to the structure of the thermal imaging data to obtain a plurality of RTP packets, as long as the length and format of each RTP packet after packetization meet the requirements of the RTP protocol. For a possible packetization mode, reference may be made to the detailed description of the subsequent embodiments, which is not described herein again.
S203: the thermal imaging equipment sequentially sends the plurality of RTP messages to the terminal so that the terminal analyzes and splices the plurality of RTP messages to obtain the thermal imaging data.
In this embodiment, the thermal imaging data sequentially sends a plurality of RTP packets obtained by packetization to the terminal through TCP or UDP. Fig. 3 is a schematic structural diagram of a message for transmitting thermal imaging data to a terminal according to the embodiment of the present invention. As shown in fig. 3, the thermal imaging device adds a TCP/UDP header to each RTP packet to obtain a TCP/UDP packet. And adding an IP header to the TCP/UDP message to obtain an IP message. And sending the IP message to the terminal through a data link layer.
After receiving the IP packet shown in fig. 3, the terminal analyzes the IP packet layer by layer to obtain RTP load data. And splicing the load data of the RTP messages, and restoring to obtain each frame of thermal imaging data.
The transmission method of the thermal imaging data provided by the embodiment of the invention comprises the following steps: after RTSP connection is established between the thermal imaging equipment and the terminal, thermal imaging data are collected, and each frame of collected thermal imaging data is subjected to sub-packet processing according to the structure of the thermal imaging data to obtain a plurality of RTP messages; the thermal imaging equipment sequentially sends the plurality of RTP messages to a terminal, and the terminal analyzes and splices the plurality of RTP messages and restores the RTP messages to obtain each frame of thermal imaging data. Through the process, real-time uncompressed streaming of the RTSP-RTP-based thermal imaging data is realized. Since the RTSP and the RTP are standard real-time transmission protocols, the thermal imaging device can transmit the thermal imaging data to any type of terminal without integrating any plug-in or extension program at the terminal side, and the universality of thermal imaging data transmission is improved.
One possible method of packetization of thermal imaging data is described below in conjunction with fig. 4 and 5.
Fig. 4 is a schematic flowchart of performing packetization processing on single-frame thermal imaging data according to an embodiment of the present invention. The method of this embodiment may be further refined as S202 in the embodiment shown in fig. 2. As shown in fig. 4, the packetization method of the present embodiment includes:
s401: the thermal imaging device takes the frame header of each frame of the collected thermal imaging data as effective load data, and encapsulates the RTP header to obtain a first RTP message.
Fig. 5 is a schematic process diagram of performing packetization processing on single-frame thermal imaging data according to an embodiment of the present invention. As shown in fig. 5, each frame of thermal imaging data includes: frame header and frame payload. The frame header is used for recording relevant information of the frame of thermal imaging data, for example: the acquisition resolution of the thermal imaging equipment, the code stream length of the thermal imaging data of the frame, the time stamp and other information. Recorded in the frame payload is valid data of the frame of thermal imaging data, such as: the frame payload can be original code stream data of thermal imaging or full screen temperature measurement data.
Because the frame header is only used for recording the key information of the thermal imaging data of the frame, the length of the frame header is far less than the length upper limit of the RTP message. Therefore, in this embodiment, the data of the frame header does not need to be packetized, and the data of the frame header is directly encapsulated into an RTP packet. For example, as shown in fig. 5, the data in the frame header is used as the payload data, and the RTP header is added to obtain an RTP packet. For convenience of description, in this embodiment, an RTP packet corresponding to a frame header of each frame of thermal imaging data is referred to as a first RTP packet.
It will be appreciated that the payload data in the first RTP packet corresponds to a header for each frame of thermal imaging data. After the terminal receives the multiple RTP messages corresponding to each frame of thermal imaging data, the key information of the thermal imaging data corresponding to the subsequent multiple RTP messages can be obtained by analyzing the first RTP message, and the terminal analysis efficiency is improved.
S402: the thermal imaging equipment divides the frame payload of each frame of thermal imaging data by taking a preset data volume as a unit to obtain N parts of data; and the data volume of each data in the first N-1 data shares is equal to the preset data volume, and the data volume of the Nth data share is less than or equal to the preset data volume.
In this embodiment, the preset data amount indicates a maximum length of the payload data that can be carried in the RTP packet. Optionally, the method for determining the preset data amount is as follows: the MSS of the RTP packet is determined according to a Maximum Transmission Unit (MTU) of a data link layer, a length of an IP header corresponding to an IP packet of an internet protocol address, and a length of a TCP header corresponding to a TCP packet of a Transmission control protocol or a length of a UDP header corresponding to a UDP packet of a user data protocol.
Illustratively, the MSS of an RTP packet is the length of the IP header, the length of the TCP/UDP header, which is the maximum transmission unit of the data link layer.
Further, the preset data volume is determined according to the length of the MSS of the RTP message and the RTP header. Illustratively, the predetermined amount of data is equal to the length of the MSS-RTP header of the RTP packet.
As shown in fig. 5, after the preset data amount is determined, the data in the frame payload of each frame of thermal imaging data is segmented by taking the preset data amount as a unit, so as to obtain N pieces of data. It is understood that the data amount of each of the first N-1 copies of data is equal to the preset data amount. The data amount of the Nth data is less than or equal to the preset data amount.
S403: and the thermal imaging equipment takes each piece of data as payload data respectively, and encapsulates the RTP header respectively to obtain N second RTP messages.
Continuing with fig. 5, an RTP packet is generated for each piece of data, the piece of data is filled into a payload data segment of the RTP packet as payload data, and an RTP header is respectively encapsulated for each RTP packet, so as to obtain N RTP packets. The N RTP packets correspond to frame payload data of the frame of thermal imaging data. For convenience of description, in this embodiment, the RTP packet corresponding to the frame payload data is referred to as a second RTP packet, that is, the N RTP packets are used as the second RTP packet.
In one possible embodiment, the RTP header includes a flag bit, wherein a value of the flag bit is used to indicate whether the RTP packet is a last RTP packet of a frame of thermal imaging data. Illustratively, the value of the flag bit in the RTP header corresponding to the first RTP packet and the first N-1 second RTP packets is set to be a first value, and the value of the flag bit in the RTP header corresponding to the nth second RTP packet is set to be a second value, where the first value and the second value are different.
In one mode, the value of the flag bit in the RTP header corresponding to the first RTP packet and the first N-1 second RTP packets is set to 0, and the value of the flag bit in the RTP header corresponding to the nth second RTP packet is set to 1. In another mode, the value of the flag bit in the RTP header corresponding to the first RTP packet and the first N-1 second RTP packets is set to 1, and the value of the flag bit in the RTP header corresponding to the nth second RTP packet is set to 0. Fig. 5 illustrates the first manner described above, i.e., setting the value of the flag bit of the RTP header corresponding to the last RTP packet to 1. M in fig. 5 is a flag bit.
In this embodiment, the value of the flag bit corresponding to the last RTP packet is set to be different from the values of the flag bits corresponding to other RTP packets, so that the terminal can quickly identify the last RTP packet of each frame of thermal imaging data according to the flag bit, thereby improving the analysis efficiency of the thermal imaging data by the terminal.
Fig. 6 is an interaction diagram of a transmission method of thermal imaging data according to an embodiment of the present invention. The embodiment illustrates a complete interaction process of data transmission between the terminal and the thermal imaging device.
As shown in fig. 6, the method of the present embodiment includes:
s601: the terminal transmits an RTSP description request to the thermal image forming apparatus.
S602: the thermal imaging device sends an RTSP description response to the terminal, wherein the RTSP description response comprises a candidate type, the candidate type is used for indicating the type of the thermal imaging data supported by the thermal imaging device, and the candidate type comprises: original code stream data of thermal imaging and full-screen temperature measurement data.
Referring to fig. 6, the terminal transmits an RTSP description request (DESCRIBE) to the thermal image forming apparatus for requesting description information of the data object. And after receiving the DESCRIBE, the thermal imaging device sends an RTSP description response to the terminal and carries one or more types of thermal imaging data supported by the thermal imaging device.
It is understood that the thermal imaging apparatus needs to define information of the type of thermal imaging data, channel identification (trackID), RTP header structure, and the like in advance before S601. And, need to avoid opening interactive data type, channel identification such as existing preview, playback. After the definition is good, the RTSP description response informs the terminal, so that the terminal can acquire certain type of thermal imaging data according to the data type, the channel identification and the like.
S603: the method comprises the steps that a terminal sends an RTSP establishment request to a thermal imaging device, wherein the RTSP establishment request comprises a target type, the target type is used for indicating the type of thermal imaging data needing to be acquired by the terminal, and the target type is one of candidate types.
S604: the thermal imaging device sends an RTSP setup response to the terminal.
When the terminal sends an RTSP SETUP request (SETUP), the type of the thermal imaging data that the terminal needs to acquire is determined from the one or more types of the thermal imaging data in the RTSP description response received in S602, and the type of the thermal imaging data that the terminal needs to acquire is carried in the SETUP and sent to the thermal imaging device, so that the thermal imaging device knows the type of the thermal imaging data that the terminal needs to acquire. And when the subsequent data is collected, the data is collected according to the type.
S605: the terminal sends an RTSP play request to the thermal imaging device.
S606: and the thermal imaging device sends an RTSP playing response to the terminal.
And after receiving the RTSP playing request (PLAY) sent by the terminal, the thermal imaging device sends an RTSP playing response to the terminal, starts to execute S607, and collects and transmits thermal imaging data.
S607: the thermal imaging equipment acquires thermal imaging data, and performs sub-packet processing on each frame of acquired thermal imaging data according to the structure of the thermal imaging data to obtain a plurality of RTP messages.
S608: and the thermal imaging equipment sequentially sends the plurality of RTP messages to the terminal.
S609: and the terminal analyzes and splices the RTP messages to obtain each frame of thermal imaging data.
In this embodiment, the specific implementation of S607 to S609 is similar to the packetization process in the embodiment shown in fig. 2 to 5, and is not described herein again.
S610: the terminal transmits an RTSP termination request to the thermal image forming apparatus.
S611: and the thermal imaging equipment stops collecting thermal imaging data and disconnects RTSP connection with the terminal.
If the thermal imaging device does not receive the RTSP termination request (TEARDOWN) sent by the terminal, the above-described S607 to S609 are cyclically executed. And when the thermal imaging equipment receives an RTSP termination request (TEARDown) sent by the terminal, stopping collecting the thermal imaging data and finishing the RTSP/RTP session with the terminal.
It should be noted that, the above RTSP protocol related session messages, for example: description request, description response, setup request, setup response, play request, play response, terminate request, terminate response, etc., and the structure of these session messages and the content carried by them may be determined according to the RTSP protocol definition. In addition to the information related to the thermal imaging data mentioned in this embodiment, other information may be included, which is not described in detail in this embodiment, and reference may be made to the related content of the RTSP protocol.
The transmission method of the thermal imaging data provided by the embodiment realizes real-time uncompressed streaming of the thermal imaging data based on the RTSP-RTP. Since the RTSP and the RTP are standard real-time transmission protocols, the thermal imaging device can transmit the thermal imaging data to any type of terminal without integrating any plug-in or extension program at the terminal side, and the universality of thermal imaging data transmission is improved.
Fig. 7 is a schematic structural diagram of a transmission apparatus for thermal imaging data according to an embodiment of the present invention. As shown in fig. 7, the present embodiment provides a transmission apparatus 700 for thermal imaging data, including: an acquisition module 701, a packetization module 702, and a communication module 703.
The acquisition module 701 is configured to acquire thermal imaging data after establishing a real-time streaming protocol (RTSP) connection with a terminal;
a sub-packaging module 702, configured to perform sub-packaging processing on each frame of acquired thermal imaging data according to the structure of the thermal imaging data to obtain a plurality of RTP packets, where the structure of the thermal imaging data includes a frame header and a frame payload;
a communication module 703, configured to sequentially send the multiple RTP packets to the terminal, so that the terminal performs parsing and packet splicing on the multiple RTP packets to obtain each frame of thermal imaging data.
Optionally, the packetization module 702 is specifically configured to:
taking a frame header of each frame of collected thermal imaging data as effective load data, and encapsulating an RTP header to obtain a first RTP message;
segmenting the frame payload of each frame of thermal imaging data by taking a preset data volume as a unit to obtain N parts of data; the data volume of each data in the first N-1 data shares is equal to the preset data volume, and the data volume of the Nth data share is smaller than or equal to the preset data volume;
and respectively using each piece of data as effective load data, and respectively encapsulating the RTP header to obtain N second RTP messages.
Optionally, the RTP header includes a flag bit;
the value of the flag bit in the RTP header corresponding to the first RTP packet and the first N-1 RTP packets is a first numerical value, the value of the flag bit in the RTP header corresponding to the nth RTP packet is a second numerical value, and the first numerical value is different from the second numerical value.
Optionally, the packetizing module 702 is further configured to:
determining the maximum message segment length MSS of the RTP message according to the maximum transmission unit of a data link layer, the length of an IP header corresponding to an Internet protocol address IP message, the length of a TCP header corresponding to a transmission control protocol TCP message or the length of a UDP header corresponding to a user data protocol UDP message;
and determining the preset data volume according to the MSS of the RTP message and the length of the RTP header.
Optionally, the communication module 703 is further configured to:
sending a candidate type to the terminal, the candidate type being used for indicating a type of thermal imaging data supported by the thermal imaging device, the candidate type comprising: thermally imaging original code stream data and full screen temperature measurement data;
receiving a target type from the terminal, wherein the target type is one of the candidate types, and the target type is used for indicating the type of thermal imaging data required to be acquired by the terminal;
the acquisition module 701 is specifically configured to acquire thermal imaging data according to the target type.
Optionally, the communication module 703 is further configured to:
and receiving an RTSP termination request sent by the terminal, responding to the RTSP termination request, stopping collecting thermal imaging data, and disconnecting RTSP connection with the terminal.
The transmission apparatus for thermal imaging data provided in this embodiment may be used to implement the technical solution in any of the above method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 8 is a schematic hardware configuration diagram of a thermal imaging apparatus according to an embodiment of the present invention. As shown in fig. 8, the present embodiment provides a thermal imaging apparatus 800 including: a processor 801 and a memory 802; a memory 802 for storing a computer program; the processor 801 is configured to execute the computer program stored in the memory to implement the transmission method of the thermal imaging data in the above embodiments. Reference may be made in particular to the description relating to the method embodiments described above.
Alternatively, the memory 802 may be separate or integrated with the processor 801.
When the memory 802 is a separate device from the processor 801, the thermal imaging apparatus 800 may further include: a bus 803 for connecting the memory 802 and the processor 801.
The thermal imaging device provided in this embodiment may be used to implement the technical solution in any of the above method embodiments, and the implementation principle and technical effect are similar, which are not described herein again.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a computer program, and the computer program is used to implement the technical solutions in any of the above method embodiments.
An embodiment of the present invention further provides a chip, including: the system comprises a memory, a processor and a computer program, wherein the computer program is stored in the memory, and the processor runs the computer program to execute the technical scheme of any one of the method embodiments.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in the incorporated application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present invention are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method of transmitting thermal imaging data, comprising:
the method comprises the steps that thermal imaging equipment collects thermal imaging data after establishing real-time streaming protocol (RTSP) connection with a terminal;
the thermal imaging equipment performs sub-packet processing on each frame of acquired thermal imaging data according to the structure of the thermal imaging data to obtain a plurality of real-time transport protocol (RTP) messages, wherein the structure of the thermal imaging data comprises a frame header and a frame payload;
the thermal imaging equipment sequentially sends the plurality of RTP messages to the terminal so that the terminal analyzes and splices the plurality of RTP messages to obtain each frame of thermal imaging data.
2. The method according to claim 1, wherein the thermal imaging device performs packet processing on each frame of acquired thermal imaging data according to a structure of the thermal imaging data to obtain a plurality of RTP packets, including:
the thermal imaging equipment takes the frame header of each frame of collected thermal imaging data as effective load data, and encapsulates an RTP header to obtain a first RTP message;
the thermal imaging equipment divides the frame payload of each frame of thermal imaging data by taking a preset data volume as a unit to obtain N parts of data; the data volume of each data in the first N-1 data shares is equal to the preset data volume, and the data volume of the Nth data share is smaller than or equal to the preset data volume;
and the thermal imaging equipment takes each piece of data as payload data respectively, and encapsulates the RTP header respectively to obtain N second RTP messages.
3. The method of claim 2, wherein the RTP header includes a flag bit;
the value of the flag bit in the RTP header corresponding to the first RTP packet and the first N-1 RTP packets is a first numerical value, the value of the flag bit in the RTP header corresponding to the nth RTP packet is a second numerical value, and the first numerical value is different from the second numerical value.
4. The method according to claim 2, wherein before the thermal imaging device cuts the frame payload of each frame of thermal imaging data in units of a preset data size to obtain N pieces of data, the method further comprises:
determining the maximum message segment length MSS of the RTP message according to the maximum transmission unit of a data link layer, the length of an IP header corresponding to an Internet protocol address IP message, the length of a TCP header corresponding to a transmission control protocol TCP message or the length of a UDP header corresponding to a user data protocol UDP message;
and determining the preset data volume according to the MSS of the RTP message and the length of the RTP header.
5. The method according to any of claims 1 to 4, wherein the thermal imaging device establishes a Real Time Streaming Protocol (RTSP) connection with the terminal, comprising:
the thermal imaging device sends a candidate type to the terminal, wherein the candidate type is used for indicating the type of the thermal imaging data supported by the thermal imaging device, and the candidate type comprises: thermally imaging original code stream data and full screen temperature measurement data;
the thermal imaging equipment receives a target type from the terminal, wherein the target type is one of the candidate types, and the target type is used for indicating the type of thermal imaging data required to be acquired by the terminal;
the thermal imaging device acquires thermal imaging data, comprising:
the thermal imaging device collects thermal imaging data according to the target type.
6. The method according to any one of claims 1 to 4, further comprising:
and after the thermal imaging equipment receives the RTSP termination request sent by the terminal, the thermal imaging equipment responds to the RTSP termination request to stop collecting thermal imaging data and disconnects RTSP connection with the terminal.
7. A device for transmitting thermal imaging data, comprising:
the acquisition module is used for acquiring thermal imaging data after establishing real-time streaming protocol (RTSP) connection with the terminal;
the sub-packaging module is used for sub-packaging the acquired thermal imaging data of each frame according to the structure of the thermal imaging data to obtain a plurality of real-time transport protocol (RTP) messages, wherein the structure of the thermal imaging data comprises a frame header and a frame payload;
and the communication module is used for sequentially sending the plurality of RTP messages to the terminal so that the terminal analyzes and splices the plurality of RTP messages to obtain each frame of thermal imaging data.
8. The apparatus of claim 7, wherein the packetization module is specifically configured to:
taking a frame header of each frame of collected thermal imaging data as effective load data, and encapsulating an RTP header to obtain a first RTP message;
segmenting the frame payload of each frame of thermal imaging data by taking a preset data volume as a unit to obtain N parts of data; the data volume of each data in the first N-1 data shares is equal to the preset data volume, and the data volume of the Nth data share is smaller than or equal to the preset data volume;
and respectively using each piece of data as effective load data, and respectively encapsulating the RTP header to obtain N second RTP messages.
9. A thermal imaging apparatus, comprising: memory, a processor and a computer program, the computer program being stored in the memory, the processor running the computer program to perform the method of any of claims 1 to 6.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a computer program which, when executed by a processor, implements the method of any of claims 1 to 6.
CN201910840012.8A 2019-09-06 2019-09-06 Thermal imaging data transmission method and device and thermal imaging equipment Pending CN112468887A (en)

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