CN105681682A - Video data transmission method and system - Google Patents
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Abstract
本发明涉及一种视频数据传输方法和系统，上述视频数据传输方法，包括如下步骤：在n路视频数据中选择k路视频数据作为基础视频数据；其中，n、k均为正整数，k＜n；将基础视频数据以外的n-k路视频数据同时进行延时处理后，分别叠加至k路基础视频数据的一路上，得到叠加视频数据；将叠加视频数据传输至接收端，接收端在接收所述叠加视频数据后，将所述叠加视频数据还原成n路视频数据；其在遇到视频路数多的时候，可以将多路视频数据转换成较少路数的视频数据进行相应传输，使传输过程中的视频数据质量得到保证。
The present invention relates to a video data transmission method and system. The video data transmission method includes the following steps: selecting k channels of video data from n channels of video data as basic video data; wherein, n and k are both positive integers, and k<n; After delaying the nk road video data other than the basic video data, they are superimposed on one road of the k road basic video data respectively to obtain the superimposed video data; After the superimposed video data, the superimposed video data is restored to n-way video data; when it encounters a large number of video channels, the multi-channel video data can be converted into less-channel video data for corresponding transmission, so that Video data quality during transmission is guaranteed.
Description
技术领域technical field
本发明涉及视频信号传输技术领域，特别是涉及一种视频数据传输方法和系统。The invention relates to the technical field of video signal transmission, in particular to a video data transmission method and system.
背景技术Background technique
随着多媒体在工作或者生活等方面的广泛应用，视频信号越来越频繁的出现在人们在的视野中。在对视频信号使用频率逐渐变高的环境下，相关视频数据的传输质量得到了较为显著的关注。With the wide application of multimedia in work or life, video signals appear more and more frequently in people's field of vision. In an environment where video signals are used more frequently, the transmission quality of related video data has received more significant attention.
实际应用中，常常需要将多路视频信号在不同的板卡之间进行传输，传统的方法是通过采用多个物理链路了进行传输，在遇到视频路数多的时候，会造成板卡间出现大量线缆，从而容易影响视频数据的传输质量。In practical applications, it is often necessary to transmit multi-channel video signals between different boards. The traditional method is to use multiple physical links for transmission. When there are many video channels, it will cause boards to There are a large number of cables in between, which easily affects the transmission quality of video data.
发明内容Contents of the invention
基于此，有必要针对传统方案容易影响视频数据传输质量的技术问题，提供一种视频数据传输方法和系统。Based on this, it is necessary to provide a video data transmission method and system for the technical problem that the traditional solution easily affects the quality of video data transmission.
一种视频数据传输方法，包括如下步骤：A video data transmission method, comprising the steps of:
在n路视频数据中选择k路视频数据作为基础视频数据；其中，n、k均为正整数，k＜n；Select k channels of video data as the basic video data in n channels of video data; wherein, n and k are both positive integers, and k<n;
将基础视频数据以外的n-k路视频数据同时进行延时处理后，分别叠加至k路基础视频数据的一路上，得到叠加视频数据；After delay processing the n-k road video data other than the basic video data at the same time, they are respectively superimposed on one road of the k road basic video data to obtain the superimposed video data;
将叠加视频数据传输至接收端，接收端在接收所述叠加视频数据后，将所述叠加视频数据还原成n路视频数据。The superimposed video data is transmitted to the receiving end, and after receiving the superimposed video data, the receiving end restores the superimposed video data into n channels of video data.
一种视频数据传输系统，包括：A video data transmission system, comprising:
选择模块，用于在n路视频数据中选择k路视频数据作为基础视频数据；其中，n、k均为正整数，k＜n；The selection module is used to select k channels of video data as basic video data in n channels of video data; wherein, n and k are both positive integers, and k<n;
叠加模块，用于将基础视频数据以外的n-k路视频数据同时进行延时处理后，分别叠加至k路基础视频数据的一路上，得到叠加视频数据；The superposition module is used for delaying the n-k road video data other than the basic video data, and then superimposing them on one road of the k road basic video data respectively to obtain the superimposed video data;
还原模块，用于将叠加视频数据传输至接收端，接收端在接收所述叠加视频数据后，将所述叠加视频数据还原成n路视频数据。The restoration module is used to transmit the superimposed video data to the receiving end, and after receiving the superimposed video data, the receiving end restores the superimposed video data into n channels of video data.
上述视频数据传输方法和系统，首先在n路视频数据中选择k路视频数据作为基础视频数据，将其他视频数据同时进行延时处理后，分别叠加至基础视频数据的一路上，得到相应的叠加视频数据，再将其传输至接收端，在接收端将所述叠加视频数据还原成n路视频数据，以实现上述n路视频数据的传输，其在遇到视频路数多的时候，可以将多路视频数据转换成较少路数的视频数据进行相应传输，使传输过程中的视频数据质量得到保证。In the above video data transmission method and system, first, k channels of video data are selected from n channels of video data as the basic video data, and after delay processing is performed on other video data at the same time, they are respectively superimposed on one road of the basic video data to obtain corresponding superimposed video data, and then transmit it to the receiving end, at the receiving end, the superimposed video data is restored to n-way video data, so as to realize the transmission of the above-mentioned n-way video data, when it encounters a large number of video channels, it can Multiple channels of video data are converted into fewer channels of video data for corresponding transmission, so that the quality of video data during the transmission process is guaranteed.
附图说明Description of drawings
图1为一个实施例的视频数据传输方法流程图；Fig. 1 is a flow chart of the video data transmission method of an embodiment;
图2为一个实施例的视频数据延时示意图；Fig. 2 is a schematic diagram of video data delay of an embodiment;
图3为一个实施例的视频数据还原示意图；Fig. 3 is a schematic diagram of video data restoration of an embodiment;
图4为一个实施例的视频数据传输系统结构示意图。Fig. 4 is a schematic structural diagram of a video data transmission system according to an embodiment.
具体实施方式detailed description
下面结合附图对本发明的视频数据传输方法和装置的具体实施方式作详细描述。The specific implementation manners of the video data transmission method and device of the present invention will be described in detail below in conjunction with the accompanying drawings.
参考图1，图1所示为一个实施例的视频数据传输方法流程图，包括如下步骤：With reference to Fig. 1, Fig. 1 shows the video data transmission method flowchart of an embodiment, comprises the following steps:
S10，在n路视频数据中选择k路视频数据作为基础视频数据；其中，n、k均为正整数，k＜n；S10, selecting k channels of video data from n channels of video data as basic video data; wherein, n and k are both positive integers, and k<n;
上述步骤S10中，若存在较多路数视频数据需要传输，为了避免出现板卡间出现大量线缆等影响传输质量或者效率的技术问题，可以在需要进行传输的n路视频数据中选择k路视频数据作为基础视频数据，再对其他n-k路视频数据进行延时和叠加，将n路视频数据转换为k路视频数据进行传输，以最大效率的利用现有传输链路的带宽，控制传输过程中视频数据的路数，保证视频数据的传输质量。上述需要进行传输的多路数视频数据具有相同的分辨率和帧率。In the above step S10, if there are many channels of video data to be transmitted, in order to avoid technical problems such as a large number of cables between boards that affect the transmission quality or efficiency, k channels can be selected from the n channels of video data that need to be transmitted. Video data is used as basic video data, and then other n-k channels of video data are delayed and superimposed, n channels of video data are converted into k channels of video data for transmission, and the bandwidth of the existing transmission link is utilized with maximum efficiency to control the transmission process The number of channels of video data in the medium ensures the transmission quality of video data. The aforementioned multiple channels of video data to be transmitted have the same resolution and frame rate.
S20，将基础视频数据以外的n-k路视频数据同时进行延时处理后，分别叠加至k路基础视频数据的一路上，得到叠加视频数据；S20, performing delay processing on the n-k channels of video data other than the basic video data at the same time, and superimposing them on one of the k channels of basic video data respectively to obtain superimposed video data;
上述步骤S20中，在选择k路基础视频数据后，可以将除基础视频数据以外的n-k路视频数据同时进行延时处理，再分别叠加至基础视频数据的一路上，这样，n路视频数据便转换成了k路视频数据。通常情况下，为了避免叠加后视频数据出现混乱现象，各路基础视频数据只叠加一路延时处理后的视频数据。In the above-mentioned step S20, after selecting the k-way basic video data, the n-k-way video data other than the basic video data can be delayed simultaneously, and then superimposed on one road of the basic video data respectively, so that the n-way video data can be Converted into k-way video data. Usually, in order to avoid confusion in the superimposed video data, each channel of basic video data only superimposes one channel of delayed-processed video data.
在将延时后的n-k路视频数叠加至k路基础视频数据的过程中，可以将第k+1路视频数据(除基础视频数据以外的n-k路视频数据中的第1路视频数据)叠加至k路基础视频数据中的第1路视频数据，将第k+2路视频数据叠加至k路基础视频数据中的第2路视频数据，以此类推，直至将除基础视频数据以外的n-k路视频数据叠加完毕，使叠加视频数据包含待传输的n路视频数据中的所有信息，以保证叠加视频数据的信息完整性，从而保证所传输的视频数据的信息完整性。In the process of superimposing the delayed n-k channels of video data on k channels of basic video data, the k+1th channel of video data (the first channel of video data in n-k channels of video data other than basic video data) can be superimposed To the first channel video data in the k-channel basic video data, superimpose the k+2-th channel video data on the second channel video data in the k-channel basic video data, and so on, until n-k other than the basic video data After the superimposition of the video data of channels is completed, the superimposed video data includes all the information in the n channels of video data to be transmitted, so as to ensure the information integrity of the superimposed video data, thereby ensuring the information integrity of the transmitted video data.
S30，将叠加视频数据传输至接收端，接收端在接收所述叠加视频数据后，将所述叠加视频数据还原成n路视频数据。S30. Transmit the superimposed video data to the receiving end, and after receiving the superimposed video data, the receiving end restores the superimposed video data into n channels of video data.
接收端在接收叠加视频数据后，可以先获取叠加视频数据中各路视频数据的组成视频数据，再分别获取各路视频数据中组成视频数据的延时信息；比如叠加视频数据中的某路视频数据是由第1路基础视频数据叠加第k+1路视频数据而成，第k+1路视频数据在叠加之前具有多少延时等；然后可以将叠加视频数据中各路视频数据的组成视频数据划分为叠加前的多路视频数据，再根据相应的延时信息还原为原来的n路视频数据，使接收端可以对上述n路视频数据对应相应的处理。After receiving the superimposed video data, the receiving end can first obtain the constituent video data of each channel of video data in the superimposed video data, and then obtain the delay information of the constituent video data of each channel of video data; for example, a certain channel of video data in the superimposed video data The data is formed by superimposing the first channel of basic video data on the k+1 channel of video data, how much delay the k+1 channel of video data has before superimposition, etc.; The data is divided into multi-channel video data before superimposition, and then restored to the original n-channel video data according to the corresponding delay information, so that the receiving end can correspondingly process the above-mentioned n-channel video data.
本实施例提供的视频数据传输方法，首先在n路视频数据中选择k路视频数据作为基础视频数据，将其他视频数据同时进行延时处理后，分别叠加至基础视频数据的一路上，得到相应的叠加视频数据，再将其传输至接收端，在接收端将所述叠加视频数据还原成n路视频数据，以实现上述n路视频数据的传输，其在遇到视频路数多的时候，可以将多路视频数据转换成较少路数的视频数据进行相应传输，使传输过程中的视频数据质量得到保证。In the video data transmission method provided by this embodiment, at first, k channels of video data are selected as basic video data among n channels of video data, and after delay processing is performed on other video data at the same time, they are respectively superimposed on one channel of the basic video data to obtain corresponding superimposed video data, and then transmit it to the receiving end, at the receiving end, the superimposed video data is restored to n-way video data, so as to realize the transmission of the above-mentioned n-way video data, when it encounters a large number of video channels, Multi-channel video data can be converted into fewer channels of video data for corresponding transmission, so that the quality of video data in the transmission process can be guaranteed.
在一个实施例中，上述将基础视频数据以外的n-k路视频数据同时进行延时处理后，分别叠加至k路基础视频数据的一路上的过程可以包括：In one embodiment, after the delay processing of the n-k channels of video data other than the basic video data is performed simultaneously, the process of superimposing them on one road of the k channels of basic video data may include:
若k＜n≤2k，将除基础视频数据以外的n-k路视频数据同时延时时间t；其中，t为正实数；If k<n≤2k, simultaneously delay the video data of n-k channels except the basic video data for a time t; wherein, t is a positive real number;
将延时后的n-k路视频数据分别叠加至一路基础视频数据上。The delayed n-k channels of video data are respectively superimposed on one channel of basic video data.
若k＜n≤2k，在选择k路视频数据作为基础视频数据后，还剩下n-k路视频数据，上述n-k＜k，可以将n-k路视频数据中的各路视频数据延时时间t，分别叠加至k基础视频数据的一路上，其中，各路基础视频数据上至多叠加一路延时后的视频数据，使n路视频数据转换为k路视频数据，以进行相应的传输。上述n-k路视频数据延时的时间t值可以根据具体的视频数据进行设置，比如设置为1秒、2秒等值。If k<n≤2k, after selecting the k-channel video data as the basic video data, there are still n-k-channel video data, and the above-mentioned n-k<k can delay each channel video data in the n-k-channel video data for a time t, respectively Superimposed on one channel of k basic video data, wherein each channel of basic video data is superimposed on at most one channel of delayed video data, so that n channels of video data are converted into k channels of video data for corresponding transmission. The above n-k channel video data delay time t value can be set according to the specific video data, for example, set to 1 second, 2 seconds or the like.
上述将除基础视频数据以外的n-k路视频数据延时a秒，并分别叠加至各路基础视频数据的一路上的过程可以包括：The above-mentioned process of delaying the n-k channels of video data other than the basic video data for a second and superimposing them on the road of each channel of basic video data may include:
先将k路基础视频数据输入FIFO存储器，将上述FIFO存储器的延时时间设置t；First input the k-way basic video data into the FIFO memory, and set the delay time of the above-mentioned FIFO memory to t;
间隔时间t后将n-k路视频数据输入FIFO存储器，再从上述FIFO存储器输出先前输入的视频数据，以实现相应视频数据的延时，进行相应的叠加。After an interval of time t, n-k channels of video data are input into the FIFO memory, and then the previously input video data is output from the above-mentioned FIFO memory, so as to realize the delay of corresponding video data and perform corresponding superposition.
在一个实施例中，上述将基础视频数据以外的n-k路视频数据同时进行延时处理后，分别叠加至k路基础视频数据的一路上的过程可以包括：In one embodiment, after the delay processing of the n-k channels of video data other than the basic video data is performed simultaneously, the process of superimposing them on one road of the k channels of basic video data may include:
若n≥2k，则将除基础视频数据以外的n-k路视频数据划分为若干组；其中，每组视频数据的路数不超过k；If n≥2k, then divide n-k channels of video data except basic video data into several groups; wherein, the number of channels of each group of video data does not exceed k;
确定各组视频数据的顺序b，对第b组视频数据进行延时b*t；其中，b为正整数，符号*表示相乘；Determine the order b of each group of video data, and delay b*t to the bth group of video data; wherein, b is a positive integer, and the symbol * represents multiplication;
将各组视频数据中的每路视频数据按照顺序依次叠加至一路基础视频数据上。Each channel of video data in each group of video data is sequentially superimposed on one channel of basic video data.
上述时间t可以根据具体的视频数据进行设置，比如设置为1秒、2秒等值。The above-mentioned time t can be set according to specific video data, for example, set to 1 second, 2 seconds or the like.
为了保证视频数据的有序叠加，每路视频数据每次至多叠加一路延时后的视频数据，若n≥2k，一次延时和叠加处理后，可能会出现存在视频数据没有得到叠加或者叠加混乱的技术问题，此时，可以将除基础视频数据以外的n-k路视频数据划分为若干组，确定各组视频数据的顺序b，按顺序分别对各组视频数据进行相应的延时和叠加，以保证最后得到的叠加视频数据的完整性。In order to ensure the orderly superimposition of video data, each channel of video data can superimpose at most one delayed video data at a time. If n≥2k, after one delay and superimposition processing, there may be video data not superimposed or superimposed confusion At this time, the video data of n-k channels other than the basic video data can be divided into several groups, the order b of each group of video data can be determined, and the respective groups of video data can be respectively delayed and superimposed in order, so as to The integrity of the finally obtained superimposed video data is guaranteed.
作为一个实施例，上述对第b组视频数据进行延时b*t的过程可以包括：As an embodiment, the above-mentioned process of delaying the bth group of video data by b*t may include:
将各组视频数据按照顺序依次输入FIFO存储器；其中，对所述FIFO存储器设定延时时间t，相邻两组视频数据输入FIFO存储器的时间间隔为t；Each group of video data is sequentially input into the FIFO memory; wherein, the delay time t is set to the FIFO memory, and the time interval between adjacent two groups of video data input FIFO memory is t;
从所述FIFO存储器中输出相应的视频数据，得到延时后的各组视频数据。Corresponding video data is output from the FIFO memory to obtain each set of delayed video data.
本实施例利用FIFO存储器对相应的视频数据进行延时处理，一般情况下，视频数据传输链路的最大传输时钟大于视频数据像素时钟，经过FIFO存储器时钟域转换后，传输所需时间可以得到有效缩短，从而可以提高相应的传输效率。In this embodiment, the FIFO memory is used to delay the corresponding video data. Generally, the maximum transmission clock of the video data transmission link is greater than the video data pixel clock. After the clock domain conversion of the FIFO memory, the time required for transmission can be effectively obtained. shorten, so that the corresponding transmission efficiency can be improved.
在一个实施例中，上述接收端将所述叠加视频数据还原成n路视频数据的过程可以包括：In one embodiment, the process of restoring the superimposed video data to n-channel video data at the receiving end may include:
获取叠加视频数据中各路视频数据的组成视频数据；Acquiring video data composed of each channel of video data in the superimposed video data;
分别获取各路视频数据中组成视频数据的延时信息；Acquiring the delay information of the video data in each channel of video data respectively;
根据所述延时信息将各组成视频数据还原成n路视频数据。Restore each component video data into n channels of video data according to the delay information.
在一个实施例中，如图2所示，若有9路视频数据(视频流)需要传输，可以先选择3路视频数据(视频流1、视频流2和视频流3)作为基础视频数据，将视频流4、视频流5和视频流6作为第一组视频数据，延时a秒后分别叠加至视频流1、视频流2和视频流3上，其中可以将延时后的视频流4叠加至视频流1上，将延时后的视频流5叠加至视频流2上，将延时后的视频流6叠加至视频流3上；再将视频流7、视频流8和视频流9作为第二组视频数据，延时2a秒后分别叠加至叠加后的视频流4、视频流5和视频流6上，其中可以将延时后的视频流7叠加至视频流4上，将延时后的视频流8叠加至视频流5上，将延时后的视频流9叠加至视频流6上，这样9路视频数据便转换成为3路叠加视频数据。In one embodiment, as shown in Figure 2, if there are 9 channels of video data (video streams) to be transmitted, 3 channels of video data (video stream 1, video stream 2 and video stream 3) can be selected as the basic video data, Taking video stream 4, video stream 5 and video stream 6 as the first set of video data, they are delayed for a second and superimposed on video stream 1, video stream 2 and video stream 3 respectively, wherein the delayed video stream 4 can be Superimpose on video stream 1, superimpose delayed video stream 5 on video stream 2, superimpose delayed video stream 6 on video stream 3; then video stream 7, video stream 8 and video stream 9 As the second group of video data, after a delay of 2a seconds, they are superimposed on the superimposed video stream 4, video stream 5 and video stream 6 respectively, wherein the delayed video stream 7 can be superimposed on the video stream 4, and the delayed The delayed video stream 8 is superimposed on the video stream 5, and the delayed video stream 9 is superimposed on the video stream 6, so that 9 channels of video data are converted into 3 channels of superimposed video data.
将上述延时和叠加处理后的3路叠加视频数据输至接收端后，如图3所示，接收端可以根据上述叠加视频数据中的组成视频数据和相关延时信息，将3路叠加视频数据分解为9路视频数据，例如，将第一路叠加视频数据还原成视频流1、视频流4和视频流7等等，再根据上述延时信息进行相应的时钟域转换，接收端便可以将其接收的3路叠加视频数据还原成原始的9路视频数据，实现对多路视频数据的传输。After the above-mentioned 3-way superimposed video data after the delay and superposition processing are transmitted to the receiving end, as shown in Figure 3, the receiving end can combine the 3-way superimposed video data according to the composition video data and related delay information in the above-mentioned superimposed video data The data is decomposed into 9 channels of video data. For example, the first channel of superimposed video data is restored to video stream 1, video stream 4, and video stream 7, etc., and then the corresponding clock domain conversion is performed according to the above delay information, and the receiving end can It restores the received 3-channel superimposed video data to the original 9-channel video data to realize the transmission of multi-channel video data.
参考图4，图4所示为一个实施例的视频数据传输系统结构示意图，包括：Referring to FIG. 4, FIG. 4 shows a schematic structural diagram of a video data transmission system of an embodiment, including:
选择模块10，用于在n路视频数据中选择k路视频数据作为基础视频数据；其中，n、k均为正整数，k＜n；Selection module 10, for selecting k road video data as basic video data in n road video data; Wherein, n, k are positive integers, k<n;
叠加模块20，用于将基础视频数据以外的n-k路视频数据同时进行延时处理后，分别叠加至k路基础视频数据的一路上，得到叠加视频数据；Superimposition module 20, after carrying out delay processing simultaneously to n-k road video data except basic video data, superimpose respectively on the road of k road basic video data, obtain superimposed video data;
还原模块30，用于将叠加视频数据传输至接收端，接收端在接收所述叠加视频数据后，将所述叠加视频数据还原成n路视频数据。The restoring module 30 is configured to transmit the superimposed video data to the receiving end, and after receiving the superimposed video data, the receiving end restores the superimposed video data into n channels of video data.
在一个实施例中，上述叠加模块可以进一步用于：In one embodiment, the above-mentioned overlay module can be further used for:
若k＜n≤2k，将除基础视频数据以外的n-k路视频数据同时延时时间t；If k<n≤2k, simultaneously delay the n-k channel video data except the basic video data for a time t;
将延时后的n-k路视频数据分别叠加至一路基础视频数据上。The delayed n-k channels of video data are respectively superimposed on one channel of basic video data.
在一个实施例中，上述叠加模块可以进一步用于：In one embodiment, the above-mentioned overlay module can be further used for:
若n≥2k，则将除基础视频数据以外的n-k路视频数据划分为若干组；其中，每组视频数据的路数不超过k；If n≥2k, then divide n-k channels of video data except basic video data into several groups; wherein, the number of channels of each group of video data does not exceed k;
确定各组视频数据的顺序b，对第b组视频数据进行延时b*t；其中，符号*表示相乘；Determine the order b of each group of video data, and delay b*t to the bth group of video data; wherein, the symbol * represents multiplication;
将各组视频数据中的每路视频数据按照顺序依次叠加至一路基础视频数据上。Each channel of video data in each group of video data is sequentially superimposed on one channel of basic video data.
作为一个实施例，上述叠加模块可以进一步用于：As an example, the above-mentioned overlay module can be further used for:
将各组视频数据按照顺序依次输入FIFO存储器；其中，对所述FIFO存储器设定延时时间t，相邻两组视频数据输入FIFO存储器的时间间隔为t；Each group of video data is sequentially input into the FIFO memory; wherein, the delay time t is set to the FIFO memory, and the time interval between adjacent two groups of video data input FIFO memory is t;
从所述FIFO存储器中输出相应的视频数据，得到延时后的各组视频数据。Corresponding video data is output from the FIFO memory to obtain each set of delayed video data.
在一个实施例中，上述还原模块可以进一步用于：In one embodiment, the above-mentioned restoration module can be further used for:
获取叠加视频数据中各路视频数据的组成视频数据；Acquiring video data composed of each channel of video data in the superimposed video data;
分别获取各路视频数据中组成视频数据的延时信息；Acquiring the delay information of the video data in each channel of video data respectively;
根据所述延时信息将各组成视频数据还原成n路视频数据。Restore each component video data into n channels of video data according to the delay information.
本发明提供的视频数据传输装置与本发明提供的视频数据传输方法一一对应，在所述视频数据传输方法的实施例阐述的技术特征及其有益效果均适用于视频数据传输装置的实施例中，特此声明。The video data transmission device provided by the present invention corresponds one-to-one to the video data transmission method provided by the present invention, and the technical features and beneficial effects described in the embodiment of the video data transmission method are applicable to the embodiment of the video data transmission device , hereby declares.
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。The various technical features of the above-mentioned embodiments can be combined arbitrarily. For the sake of concise description, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.
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