Research And Realization Of Scalable Video Coding Technology

Along with the Internet development, people start on the network delivering video frequency and picture, hence the target of the coding of video frequency and picture also from traditionally face to saving change into face to of now to deliver.For carrying out a video frequency on the network of deliver, put forward 2 kinds differently solve way of thinking, a kind of way of thinking takes network as center and request the router in the network/exchange machine to flow to provide a bandwidth and delay, tremble to move, throw a service quality control of lose the rate for the medium;Another angle handled from the signal see, research how code the technique to the current video frequency to apply to a network to deliver to moderate a research new of is suitable for network to deliver of video frequency code calculate way.For video frequency this type of according to the multi-media data in time(time-based), the customer who receives a video frequency on the network has at 2:00 a basic request:The first, the quick start, can't have very long of time delay;The second, project in a row, then broadcast process can't be interrupt.So, the server will beat a video frequency data add the wrap of Chuo sometimes sends out through a network to the customer, and request to be receive by the customer in these packs of times which in order is give to settle.But, these requests are to can't get the assuring under the current network appearance.Wanting to work out this problem can consider from the both side.On the other hand see from the standpoint of network, be want to break a current network frame, but the establishment lately take to have the network system of the assuring service quality(QoS) the structure;However, today corresponded by letter to make widely available day by day in the Internet and the wireless, the system structure of the change network exists a lot of problem, isn't the affair that the in a short time can resolve.On the other hand, the angle handled from the signal see, be research how code the technique to the current video frequency to apply to a network to deliver to moderate a research new of is suitable for network to deliver of video frequency code calculate way.The video frequency thered has been in the application coding the technique deliver at the network of in the research, people adopted a mistake instauration(error resilience), mistake conceal(error concealment), letter way code(channel coding), flow to cut over(the switching of the bit-stream) an etc. technique from the orientation code(adaptive encoding), Transcoding and code, obtained some results;In the research newly of in keeping withly the network deliver of the video frequency the coding of the calculate way, people put forward and can expand the thought of sex coding, include the area can expand sex(temporal scalable) coding, empty the area can expand sex coding(spatial scalable) coding, quality and can expand sex(quality scalable) coding, fine and can expand sex(FGS, the scalable of the fine granular) to code and gradually enter of the fine can expand sex(PFGS, progressive FGS) coding etc., they have code to flow the characteristic that can cut off, and own certain false instauration ability, can adapt the variety of the network bandwidth and the creation of the mistake code, but code of the function certainly lowered.The article introduced first the video frequency code of some knowledge, the flexible code of a little bit hot and present condition, introduced later on the flexible code of thought and code principle and in general use frame.Then, some problems that some characteristicses and video frequency face when deliver which introduced network correspondence, mainly include different Gou, bandwidth restriction and postpone, throw to quarrel mistake code etc. problem, introduced a traditional video frequency in the meantime the coding delivers a medium application in the network.Improvement according to sport of the piece time ratings compress calculate way and broke former time the concept of the stalk last processing, with sport estimate the picture piece in the value technique's sport's vector's etc. as generous character, carry on coding to the sport vector of son piece, method is the code word which assigns each fixed-length with a sport vector, Be each statures piece sport speed of generous character, piece on time frequency gradation, adopt to differently break rate coding respectively.Finally pass to imitate reality to check conclusion, carry on ratings coding to the sport characteristic of piece in the picture, different from usually according to the flexible coding of, can even adapt the mankind's sense of vision characteristic, raise the portrait quality of basic layer.Have larger vivid with better comprehensive function, provide more vivid of code a control, test to show that having good visual system characteristic and video frequency compresses an efficiency.