【摘要】：隨著視頻壓縮編碼技術(shù)和網(wǎng)絡(luò)技術(shù)的不斷發(fā)展,基于網(wǎng)絡(luò)傳輸?shù)囊曨l得到了廣泛的應(yīng)用。長(zhǎng)期以來(lái),我國(guó)在數(shù)字音視頻產(chǎn)業(yè)發(fā)展方面一直受制于國(guó)外的視頻壓縮編碼標(biāo)準(zhǔn),每年都要支付高額的專利費(fèi)用。為此我國(guó)成立了AVS工作組,制定了具有我國(guó)自主知識(shí)產(chǎn)權(quán)的數(shù)字音視頻編解碼標(biāo)準(zhǔn)AVS。AVS標(biāo)準(zhǔn)具有編解碼效率高、編解碼算法復(fù)雜度低和軟硬件實(shí)現(xiàn)成本低等優(yōu)勢(shì),未來(lái)必然能在數(shù)字音視頻領(lǐng)域得到廣泛的應(yīng)用。 基于網(wǎng)絡(luò)傳輸?shù)囊曨l編碼與面向存儲(chǔ)的視頻編碼存在著很大的差異,它必須考慮到網(wǎng)絡(luò)的異構(gòu)性以及終端設(shè)備的多樣性等因素,因此編碼器所編出的碼流應(yīng)在空間、時(shí)間、質(zhì)量等方面可伸縮,這樣的碼流才具有很好的適應(yīng)能力,可伸縮視頻編碼(Scalable Video Coding, SVC)技術(shù)就在這樣的環(huán)境下應(yīng)運(yùn)而生。SVC實(shí)現(xiàn)了只對(duì)視頻序列進(jìn)行一次編碼,接收終端就可根據(jù)網(wǎng)絡(luò)連接情況和自身的顯示尺寸,對(duì)編碼碼流部分解碼或者部分傳輸,從而保持帶寬均衡和清晰流暢的多畫面顯示。毫無(wú)疑問(wèn),對(duì)可伸縮視頻編解碼技術(shù)的深入研究具有極其重要的意義。 本課題的設(shè)計(jì)目標(biāo)是實(shí)現(xiàn)可伸縮視頻編解碼系統(tǒng),故首要工作是實(shí)現(xiàn)一個(gè)優(yōu)化的AVS解碼器,接著修改AVS編解碼算法,最終實(shí)現(xiàn)AVS空間可伸縮編碼以及碼流的正確解碼。主要研究的內(nèi)容及成果如下： ●在對(duì)AVS編解碼原理及官方發(fā)布的參考解碼軟件深入研究的基礎(chǔ)上,提出了新的解碼流程。首先在PC機(jī)上用C代碼實(shí)現(xiàn)了新的AVS解碼器,并對(duì)該解碼器進(jìn)行C代碼級(jí)別的優(yōu)化。重點(diǎn)采用SIMD技術(shù)中的MMX指令集和SSE2指令集對(duì)新解碼器中運(yùn)算量集中且耗時(shí)較多的代碼段進(jìn)行改寫。經(jīng)過(guò)優(yōu)化后的新解碼器實(shí)現(xiàn)了D1格式圖像基于PC平臺(tái)的實(shí)時(shí)解碼。 ●通過(guò)對(duì)可伸縮視頻編碼原理和關(guān)鍵技術(shù)的研究,提出了一個(gè)AVS空間可伸縮視頻編解碼方案,與SVC相比較為簡(jiǎn)單。首先按照該方案對(duì)編碼器進(jìn)行相關(guān)代碼的修改,修改之后的編碼器所編出的碼流可以提供多種分辨率的視頻序列；然后解碼器再通過(guò)對(duì)低分辨率的圖像進(jìn)行上采樣從而得到不同分辨率的視頻序列。本課題最終實(shí)現(xiàn)了AVS可伸縮視頻編解碼系統(tǒng)。 文章最后對(duì)下一步的研究方向進(jìn)行了簡(jiǎn)要的討論。
[Abstract]:With the development of video compression and coding technology and network technology, video based on network transmission has been widely used. For a long time, the development of digital audio and video industry in China has been restricted by foreign video compression coding standards, and it has to pay a high patent fee every year. For this reason, AVS working group has been established in our country, and the digital audio and video codec standard AVS.AVS, which has our own intellectual property rights, has the advantages of high efficiency, low complexity of coding and decoding algorithm and low cost of software and hardware implementation. The future is bound to be widely used in the field of digital audio and video. The video coding based on network transmission is very different from that of storage oriented video coding. It must take into account the heterogeneity of network and the diversity of terminal equipment, so the code stream compiled by encoder should be in space and time. Quality and other aspects can be scalable, such a stream has a good adaptability, scalable video coding (Scalable Video Coding, SVC) technology came into being in such an environment. SVC realized only one video sequence coding, The receiving terminal can decode or transmit part of the coded code stream according to the network connection and its own display size so as to keep the bandwidth balanced and clear and smooth multi-screen display. There is no doubt that the in-depth study of scalable video coding and decoding technology is of great significance. The design goal of this thesis is to realize scalable video codec system, so the most important work is to realize an optimized AVS decoder, and then modify the AVS codec algorithm to realize the scalable coding in AVS space and the correct decoding of the code stream. The main contents and results are as follows: based on the in-depth study of AVS codec principle and official reference decoding software, a new decoding process is proposed. At first, a new AVS decoder is implemented with C code on PC computer, and the decoder is optimized at C level. The MMX instruction set and the SSE2 instruction set in SIMD technology are used to rewrite the code segments which are computationally concentrated and time-consuming in the new decoder. The optimized new decoder realizes the real-time decoding of D 1 image based on PC platform. By studying the principle and key technologies of scalable video coding, a scalable video coding and decoding scheme in AVS space is proposed, which is simpler than SVC. Firstly, the encoder is modified according to the scheme. The modified code stream can provide a variety of video sequences with different resolution. Then the decoder gets the video sequence with different resolution by up-sampling the low resolution image. Finally, the AVS scalable video coding and decoding system is implemented. Finally, the next research direction is briefly discussed.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TN919.81

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本文編號(hào)：2397133