本文關(guān)鍵詞：H.264的視頻質(zhì)量評估及編解碼算法的實現(xiàn)　出處：《西安電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： H.264 SSIM DM6446

【摘要】：隨著時代的發(fā)展和科技的進步,多媒體技術(shù)越來越多的滲入到我們的生活中,視頻通信業(yè)務(wù)正在逐步滲入各行各業(yè)成為數(shù)字通信網(wǎng)絡(luò)的主要業(yè)務(wù)之一。在眾多的視頻業(yè)務(wù)中,嵌入式視頻監(jiān)控作為當(dāng)今應(yīng)用越來越廣泛的監(jiān)控手段,在各行各業(yè)的安保系統(tǒng)中起到了舉足輕重的作用。本文的提出是為了實現(xiàn)無人看守的視頻監(jiān)控系統(tǒng)方案,由于監(jiān)控系統(tǒng)的研究重點部分為視頻的處理,視頻數(shù)據(jù)具有數(shù)據(jù)量大、對帶寬要求高的特點,因此,要想滿足視頻數(shù)據(jù)在特定帶寬的信道上實現(xiàn)高質(zhì)量的傳輸,我們需要選取高效的壓縮算法。國際上對視頻壓縮標(biāo)準(zhǔn)的研究已經(jīng)經(jīng)歷了多年的發(fā)展。H.264視頻編碼標(biāo)準(zhǔn)作為當(dāng)今主流的視頻壓縮編碼標(biāo)準(zhǔn),在實現(xiàn)對視頻的高效壓縮、在特定碼率信道實現(xiàn)更加優(yōu)秀視頻質(zhì)量傳輸方面有很好的表現(xiàn)。本文首先對比了H.264壓縮算法相對于其他主流壓縮算法的性能優(yōu)劣,然后確定了采用H.264作為本文壓縮算法。選定了視頻壓縮編碼的標(biāo)準(zhǔn),我們還需要選取一個好的視頻質(zhì)量評定標(biāo)準(zhǔn)用來衡量視頻質(zhì)量的好壞,這對優(yōu)化視頻壓縮算法起了重要的作用。視頻質(zhì)量評估分為主觀視頻質(zhì)量評估和客觀視頻質(zhì)量評估兩大類,主觀視頻質(zhì)量雖然具有評價符合人眼觀察視頻質(zhì)量特性的優(yōu)點,但是考慮到主觀視頻質(zhì)量評估實現(xiàn)環(huán)境要求苛刻,因此我們需要開發(fā)對易于操作實現(xiàn)、便于測試以及與主觀視頻質(zhì)量評價相關(guān)性好的客觀視頻質(zhì)量評價方法。集合上述條件,本文采用基于結(jié)構(gòu)相似度的客觀視頻質(zhì)量方法。首先,本文對SSIM與其他常用客觀視頻質(zhì)量評估方法進行了對比,進一步驗證了SSIM客觀視頻質(zhì)量評估方法能準(zhǔn)確評價視頻質(zhì)量的特點。然后,本文采用SSIM客觀視頻質(zhì)量評估方法對H.264編碼后的視頻進行了質(zhì)量評估,還對不同傳輸環(huán)境下不同算法解碼方法解碼的視頻進行了評估,通過對比進一步驗證了H.264適用于本文監(jiān)控系統(tǒng)方案的特點。H.264編碼的形式多種多樣,在嵌入式系統(tǒng)中實現(xiàn)H.264編碼有很大的優(yōu)越性。目前嵌入式視頻系統(tǒng)中大多采用DSP處理器作為視頻處理器。例如:德州儀器推出的DM6446處理器作為一款專門針對多媒體應(yīng)用的處理器,就是采用ARM+DSP處理架構(gòu)對視頻進行處理。其獨特的雙核處理架構(gòu),對視頻信號的處理體現(xiàn)出了強大的優(yōu)勢,對達芬奇平臺的開發(fā)具有很大的實用價值。本文提出了基于DM6446平臺的新開發(fā)方案,可以避免使用DM6446平臺的codec機制。提高了該平臺在算法修改上的靈活性。并利用DM6446平臺實現(xiàn)了H.264算法。
[Abstract]:With the development of the times and the progress of science and technology, more and more multimedia technology has penetrated into our life. Video communication service is gradually infiltrating into all walks of life to become one of the main services of digital communication network. In many video services, embedded video surveillance as a more and more widely used monitoring means. It plays an important role in the security system of various industries. The purpose of this paper is to realize the unattended video surveillance system, because the focus of the monitoring system is the processing of video. Video data has the characteristics of large amount of data and high demand for bandwidth. Therefore, to meet the requirements of video data in a specific bandwidth channel to achieve high-quality transmission. We need to select efficient compression algorithms. The international research on video compression standards has experienced many years of development. H. 264 video coding standards as the mainstream video compression standards. In the realization of efficient video compression. The performance of H.264 compression algorithm is compared with that of other mainstream compression algorithms. Then we choose H.264 as our compression algorithm. We select the standard of video compression coding. We also need to select a good video quality evaluation standard to measure the quality of video. This plays an important role in optimizing video compression algorithms. Video quality assessment is divided into subjective video quality assessment and objective video quality evaluation. Although subjective video quality has the advantages of evaluating video quality characteristics of human eye observation, but considering the harsh requirements of subjective video quality evaluation implementation environment, we need to develop easy to implement. Objective video quality evaluation method is easy to test and has good correlation with subjective video quality evaluation. Based on the above conditions, this paper adopts the objective video quality method based on structural similarity. First of all. In this paper, SSIM and other commonly used objective video quality evaluation methods are compared, further verify the SSIM objective video quality evaluation method can accurately evaluate the characteristics of video quality. In this paper, the SSIM objective video quality evaluation method is used to evaluate the quality of H.264 encoded video, and the video decoded by different algorithms and decoding methods under different transmission environment is also evaluated. Through comparison, it is further verified that H.264 is suitable for the monitoring system in this paper. The coding forms of H.264 are various. H.264 coding has great advantages in embedded system. At present, most embedded video systems use DSP processor as video processor. For example:. Texas Instruments introduced the DM6446 processor as a processor dedicated to multimedia applications. ARM DSP processing architecture is used to process video. Its unique dual-core processing architecture, video signal processing shows a strong advantage. It has great practical value for the development of Da Vinci platform. In this paper, a new development scheme based on DM6446 platform is proposed. It can avoid the codec mechanism of DM6446 platform, improve the flexibility of the platform in algorithm modification, and use DM6446 platform to implement H.264 algorithm.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN919.81

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相關(guān)期刊論文 前1條

1 田洪金;戰(zhàn)蔭偉;;基于自適應(yīng)分塊和SSIM的運動目標(biāo)檢測[J];計算機科學(xué);2014年02期

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本文編號：1406165