Network Adaptive Wireless Video Transmission Algorithm For Study

With the development of wireless networks, wireless networks can provide higher and higher bandwidth, which makes video transmission using wireless networks as possible. However, as the video signal a huge amount of information and data, must be efficient compression can be transmitted over wireless networks. Since wireless networks with features such as the instability, which requires not only have adopted efficient compression algorithm performance, but also a good network of affinity and strong fault tolerance.This article is for wireless video surveillance were studied. First, the introduction of the existing video coding algorithm, and its analysis, and secondly, on the basis of previous studies in the proposed network adaptive algorithm for wireless video transmission. The algorithm is divided into two parts, the first part is from the video capture terminal to the intermediate processing equipment, the use of distributed video coding algorithm, and made a corresponding improvement; the second part of the processing equipment from the middle to the end user's transmission The main use of the H.264 algorithm, and transform and H.264 coding algorithms have made some improvements.Made mainly from the following further study and improvements:(1) We put distributed network adaptive video coding into wireless video transmission algorithm, Adaptive wireless video transmission on the network algorithm was useful to expand. Distributed Video Coding has changed the traditional thinking of the video coding can significantly reduce the complexity of the encoder, especially for simple terminal equipment, wireless monitoring system.(2) Made improvement on part of the H.264 transformmation corresponding. Now part of H.264 transform coding algorithm is used in DCT-, DCT transform block effect will appear. This reference wavelet transform in image processing applications mature, the wavelet transform in the transform part, a good place for a box effect. Because the wavelet transform can be a very good high frequency and low frequency separation layer has a very good effect, to better achieve the layered video transmission.(3) In the fault-tolerant control. This improved the original H.264 rate control algorithm, the receiver according to the received packet error rate to adjust the sending rate RTP stream. Adjust the strategy generally adopted quickly ramp the way down, that does not meet the threshold value, the use of additive factors increase the RTP packet sending rate, and in the need to reduce the sending rate, then the multiplication factor used to rapidly reduce the transmission side Sending rate. In this paper, the dynamic increase factor, the RTP rate is more stable, the received video quality has improved significantly.