[Audio Network Information] In today's system integration industry, major system integration vendors are launching their own brand's unique features. A brand can occupy a certain position in the market for a long time, then it must have its own survival advantage. In the CREATOR series, the features of powerful central control, stable matrix signal and clear sound quality of the conference system have always occupied a certain share of the market. Among the many functions, the wireless touch screen realizes long-distance transmission of wireless video, and displays a video signal on the wireless control terminal, so that the wireless touch screen not only has the function of controlling the platform, but also can display the monitoring screen, so that the touch screen is more fashionable.
In fact, we seem to be very simple wireless video transmission technology, but there are great difficulties, especially in the touch screen.
The wireless channel has limited bandwidth resources and many interference factors, while the video signal has a large amount of data and high real-time requirements. Therefore, research on wireless video transmission technology has attracted wide interest from scholars at home and abroad.
Below I briefly state the difficulty of wireless video transmission technology: In fact, the main difficulty in implementing wireless video transmission technology in touch screen is video compression coding technology and video coding real-time technology, in addition to the rate control, to ensure the video picture. Stable and high fidelity.
1. Video compression coding technology The amount of video information is very amazing. To be transmitted over a wireless network with limited bandwidth, it must be compression-coded. At present, there are two major standardization organizations in the world - ITU-T and MPEG - specializing in video coding methods, responsible for the standard of fairness and uniformity, and facilitating the interoperability between various video products. These agreements focus on the best results in academia.
In addition to a variety of coding techniques based on international standards, the development of many new technologies is compelling.
2. Real-time research on video coding Due to the particularity of video data, the video transmission system has high requirements for real-time performance. The focus here is on the real-time problem based on the video coding protocol algorithm. Although wavelet coding and other algorithms have many advantages, the complexity of the algorithm is too high, and it is difficult to achieve real-time requirements at present. The following describes several important aspects of the protocol-based coding algorithm, which play an important role in improving the real-time performance of the video coding system.
3, rate control research coding strategy is an important part of the encoder. Rate control technology is one of the key technologies in video communication applications. It is responsible for the coordination between the various links of the encoder and the transmission channel and decoder, and plays an important role in the encoder. Since the rate control strategy needs to be determined by the specific application, video coding protocols such as H.263+ and MPEG-4 do not specify a specific rate control method.
Because the video stream structure has the characteristics of layering, the research of the rate control scheme is generally divided into two layers, image layer rate control and macroblock layer rate control. The main task of image layer rate control is to determine the output expectation of the frame image before encoding the image frame according to the expectation of the encoder output rate, the limitation of the system transmission delay, and the overflow of the transmission buffer. The number of bits. The main task of the macroblock layer rate control is to control the output desired bit number of the frame image determined according to the image layer code rate, and select an appropriate quantization step size for each part of the image. The main basis for macroblock layer rate control is the Rate- Distortion model.
Although the difficulties are great, we have been breaking through various technical problems and determined to provide more high-quality equipment services for our customers.
In fact, we seem to be very simple wireless video transmission technology, but there are great difficulties, especially in the touch screen.
The wireless channel has limited bandwidth resources and many interference factors, while the video signal has a large amount of data and high real-time requirements. Therefore, research on wireless video transmission technology has attracted wide interest from scholars at home and abroad.
Below I briefly state the difficulty of wireless video transmission technology: In fact, the main difficulty in implementing wireless video transmission technology in touch screen is video compression coding technology and video coding real-time technology, in addition to the rate control, to ensure the video picture. Stable and high fidelity.
1. Video compression coding technology The amount of video information is very amazing. To be transmitted over a wireless network with limited bandwidth, it must be compression-coded. At present, there are two major standardization organizations in the world - ITU-T and MPEG - specializing in video coding methods, responsible for the standard of fairness and uniformity, and facilitating the interoperability between various video products. These agreements focus on the best results in academia.
In addition to a variety of coding techniques based on international standards, the development of many new technologies is compelling.
2. Real-time research on video coding Due to the particularity of video data, the video transmission system has high requirements for real-time performance. The focus here is on the real-time problem based on the video coding protocol algorithm. Although wavelet coding and other algorithms have many advantages, the complexity of the algorithm is too high, and it is difficult to achieve real-time requirements at present. The following describes several important aspects of the protocol-based coding algorithm, which play an important role in improving the real-time performance of the video coding system.
3, rate control research coding strategy is an important part of the encoder. Rate control technology is one of the key technologies in video communication applications. It is responsible for the coordination between the various links of the encoder and the transmission channel and decoder, and plays an important role in the encoder. Since the rate control strategy needs to be determined by the specific application, video coding protocols such as H.263+ and MPEG-4 do not specify a specific rate control method.
Because the video stream structure has the characteristics of layering, the research of the rate control scheme is generally divided into two layers, image layer rate control and macroblock layer rate control. The main task of image layer rate control is to determine the output expectation of the frame image before encoding the image frame according to the expectation of the encoder output rate, the limitation of the system transmission delay, and the overflow of the transmission buffer. The number of bits. The main task of the macroblock layer rate control is to control the output desired bit number of the frame image determined according to the image layer code rate, and select an appropriate quantization step size for each part of the image. The main basis for macroblock layer rate control is the Rate- Distortion model.
Although the difficulties are great, we have been breaking through various technical problems and determined to provide more high-quality equipment services for our customers.
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