本文選題：3D-HEVC + JND　； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：近年來,攝像技術(shù)的飛速發(fā)展,帶動了高清、超高清視頻的飛速發(fā)展。雖然相應(yīng)的硬件處理設(shè)備也有一定的改善,但視頻壓縮編碼一直是一個重要的研究問題。相比過去的H.246編碼標(biāo)準(zhǔn),最新的國際視頻編碼標(biāo)準(zhǔn)HEVC在編碼質(zhì)量保持不變的情況下對高分辨率視頻的壓縮碼率可以降低一半。高清視頻發(fā)展到一定階段,開始向立體視頻發(fā)展�，F(xiàn)在多視點裸眼三維以及360度全景視頻的研究方興未艾。全景視頻能帶給用戶更好的沉浸式體驗,但是其數(shù)據(jù)量遠遠大于高清視頻。因此,在全景視頻的編碼過程中,HEVC的編碼優(yōu)勢得以進一步的體現(xiàn)。本文重點研究基于HEVC標(biāo)準(zhǔn)的三維視頻編碼技術(shù)(3D-HEVC)。3D-HEVC相對于普通高清視頻,編碼的原理與過程更加復(fù)雜,編碼的框架更加繁瑣,編碼所消耗的時間也大大增加。因此,針對上述問題,本文的工作主要包括:(1)人眼視覺系統(tǒng)具有各種掩藏效應(yīng)及屏蔽效應(yīng),而且只能察覺超過一個特定閾值的信號變化,因此,本文將該視覺特性引入到3D-HEVC編碼技術(shù)中,提出了基于像素域的恰可察失真(JustNoticeable Distortion,JND)模型的優(yōu)化視頻編碼算法。該方法通過引入JND閾值的判斷來代替復(fù)雜的率失真優(yōu)化的過程,用于幀內(nèi)編碼單元(CodingUnit,CU)的快速劃分,從而有效地降低了復(fù)雜度,節(jié)省了編碼時間;(2)由于編碼單元的總比特數(shù)(Total Bits)與視頻本身的紋理復(fù)雜度密切相關(guān),因此,本文所提出的幀內(nèi)優(yōu)化算法不僅考慮到了人眼的視覺特性,還進一步引入編碼單元總比特數(shù)作為編碼單元的劃分的判定標(biāo)準(zhǔn)。本文根據(jù)這兩個特征進行訓(xùn)練,尋找最合適的JND和總比特數(shù)閾值來優(yōu)化編碼單元的劃分,從而可以省去大量的統(tǒng)計時間,直接確定相應(yīng)的劃分閾值,在保證編碼重建質(zhì)量的前提下,有效降低編碼時間;(3)本文研究了全景圖以及全景視頻的生成原理,分析了全景圖的柱面拼接算法。由于拼接后的全景圖和全景視頻數(shù)據(jù)量非常大,甚至于比高清視頻還要大很多,目前使用H.264標(biāo)準(zhǔn)對其編碼往往壓縮效率極低。由于其數(shù)據(jù)結(jié)構(gòu)的復(fù)雜性,目前國際上對全景圖及全景視頻編碼尚未形成統(tǒng)一的標(biāo)準(zhǔn)。本文將HEVC標(biāo)準(zhǔn)算法應(yīng)用到全景視頻的編碼中,提出了基于HEVC的全景視頻編碼算法,有效提高了編碼的率失真性能。
[Abstract]:In recent years, the rapid development of camera technology, driving the rapid development of HD, ultra-HD video. Although the corresponding hardware processing equipment has been improved, video compression coding has been an important research problem. Compared with the previous H.246 coding standard, the latest international video coding standard, HEVC, can reduce the compression rate of high-resolution video by half while the coding quality remains the same. HD video develops to a certain stage and begins to develop to stereoscopic video. Now multi-view naked eye 3 D and 360-degree panoramic video are in the ascendant. Panoramic video can bring users a better immersive experience, but the amount of data is much larger than HD video. Therefore, in the panoramic video coding process, the advantages of HEVC coding can be further reflected. This paper focuses on the 3D video coding technology based on HEVC standard. 3D-HEVC.3D-HEVC is more complex in principle and process than in ordinary high-definition video, the frame of coding is more complicated, and the time consumed in coding is greatly increased. Therefore, in response to the above problems, the work of this paper mainly includes: 1) the human visual system has a variety of hiding effects and shielding effects, and can only detect signal changes over a specific threshold. In this paper, the visual characteristic is introduced into the 3D-HEVC coding technology, and an optimized video coding algorithm based on the pixel domain is proposed. In this method, the decision of JND threshold is introduced to replace the complex rate-distortion optimization process, and it is used for fast partition of coding unit within frames, thus reducing the complexity effectively. Since the total bit number of the coding unit is closely related to the texture complexity of the video itself, the intra-frame optimization algorithm proposed in this paper not only takes into account the visual characteristics of the human eye, but also reduces the coding time. Furthermore, the total bit number of the coding unit is introduced as the criterion for the partition of the coding unit. According to these two characteristics, this paper trains to find the most suitable JND and total bit number threshold to optimize the division of coding units, thus can save a lot of statistical time, and directly determine the corresponding threshold. In this paper, the principle of panoramic image and panoramic video generation is studied, and the cylindrical mosaic algorithm of panoramic image is analyzed. Because of the large amount of panoramic image and panoramic video after stitching, even more than high-definition video, the coding efficiency of H.264 standard is very low. Due to the complexity of its data structure, there is no uniform standard for panorama and panoramic video coding in the world. In this paper, the HEVC standard algorithm is applied to the panoramic video coding, and a panoramic video coding algorithm based on HEVC is proposed, which can effectively improve the rate distortion performance of the coding.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN919.81

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