本文關(guān)鍵詞： HEVC 3D-HEVC 虛擬視點(diǎn)合成 視點(diǎn)合成預(yù)測 視點(diǎn)合成優(yōu)化　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

【摘要】：三維視頻(3DV)可提供觀看場景的深度信息,為用戶提供立體視覺體驗(yàn)。近期運(yùn)動圖像專家組(MPEG)以多視點(diǎn)視頻加深度(MVD)作為3DV數(shù)據(jù)格式,在HEVC基礎(chǔ)上制定新一代3DV編碼標(biāo)準(zhǔn)3D-HEVC。相比于傳統(tǒng)的二維視頻,MVD增加了額外視點(diǎn)的視頻信息和深度圖信息,使得編碼碼率大大增加。由于不同視點(diǎn)視頻取自同一拍攝場景,視點(diǎn)間具有較強(qiáng)的相關(guān)性,可用于提高編碼效率。同時,由于深度信息主要用于解碼端的虛擬視點(diǎn)合成而非直接觀看,因此其率失真優(yōu)化準(zhǔn)則與傳統(tǒng)視頻編碼有所不同。本文主要研究了3D-HEVC中紋理編碼的視點(diǎn)合成預(yù)測技術(shù)和深度編碼的視點(diǎn)合成優(yōu)化技術(shù)。視點(diǎn)合成預(yù)測是一種特殊的視點(diǎn)間預(yù)測編碼方法,其利用視點(diǎn)間匹配塊和深度圖合成出當(dāng)前位置的預(yù)測塊進(jìn)行預(yù)測編碼。將虛擬深度塊分為4×8或8×4子塊,然后在每個子塊中比較左上、右上、左下和右下位置的深度值選擇最大深度值。由于3D-HEVC中深度圖不做去方塊濾波,在選擇最大深度值時會受到塊效應(yīng)的影響�；诖�,本文提出兩種改進(jìn)方法,第一種取每個子塊中間位置的深度值作為最大深度值,第二種是取每個子塊四個角向內(nèi)偏移一個像素的四個位置求最大值以有效避開邊界的影響。實(shí)驗(yàn)結(jié)果表明,本文所提兩種方法使非基本視點(diǎn)的碼率平均降低了0.07%和0.18%。且第二種方法選取的最大深度值對應(yīng)的視差向量更能準(zhǔn)確預(yù)測當(dāng)前塊。不同于紋理圖,深度圖其編碼目的主要用于解碼端合成虛擬視點(diǎn)。因此,現(xiàn)有3D-HEVC提出了基于虛擬視點(diǎn)質(zhì)量最優(yōu)的深度編碼算法。編碼中間深度需要計算6個合成虛擬位置視點(diǎn)的失真,目前率失真準(zhǔn)則中6個視點(diǎn)失真采用等權(quán)值機(jī)制。由于0.25、1.25和0.75、1.75位置分別距離左邊和右邊視點(diǎn)比較近,失真比較小;而中間位置0.5和1.5相對失真比較大,所以賦予這兩個失真較大權(quán)值,以此更能精確選擇出失真最小的編碼模式。本文嘗試設(shè)計了11組不同權(quán)值進(jìn)行了實(shí)驗(yàn)測試。初步實(shí)驗(yàn)結(jié)果顯示,在較大QP下增大0.5及1.5位置的權(quán)重可使得整體合成質(zhì)量增加;每個QP下選擇出一組效果較優(yōu)的權(quán)值,可使合成視點(diǎn)質(zhì)量平均提高0.05%。通過大量實(shí)驗(yàn),本文擬合出了不同QP與較優(yōu)權(quán)重的關(guān)系以提高合成視點(diǎn)質(zhì)量。
[Abstract]:3D Video V3 DVV) can provide the depth information of the viewing scene and provide the stereoscopic vision experience for the user. The recent moving Image expert Group (MPEGG) uses multi-view video plus depth MVDD as the 3DV data format. A new generation of 3DV coding standard 3D-HEVCis developed on the basis of HEVC. Compared with the traditional 2D video, the coding rate of the new 3DV coding standard is greatly increased because the video information and depth map information of the additional viewpoint are added to the traditional 3D video coding standard. Because different view video is taken from the same shooting scene, the coding rate of the new 3DV coding standard is greatly increased. Because the depth information is mainly used in the virtual view synthesis of the decoder, it can be used to improve the coding efficiency. Therefore, the rate-distortion optimization criterion is different from traditional video coding. This paper mainly studies the viewpoint synthesis prediction technology in 3D-HEVC texture coding and the viewpoint synthesis optimization technology in depth coding. Viewpoint synthesis prediction is a special method. Interview prediction coding method, The prediction block of the current position is synthesized by using the viewpoint matching block and the depth map. The virtual depth block is divided into 4 脳 8 or 8 脳 4 subblocks, and then the upper left and the upper right are compared in each sub-block. The depth values of the left and right lower position choose the maximum depth value. Because the depth map in 3D-HEVC is not filtered by block, it will be affected by block effect when selecting the maximum depth value. Based on this, two improved methods are proposed in this paper. The first is to take the depth value of the middle position of each sub-block as the maximum depth value, the second is to obtain the maximum value by taking the four positions of one pixel offset one pixel from the four angles of each sub-block in order to avoid the influence of the boundary effectively. The two methods proposed in this paper reduce the average bit-rate of non-basic viewpoint by 0.07% and 0.18.The parallax vector corresponding to the maximum depth value of the second method can accurately predict the current block. The coding purpose of depth map is mainly used for synthesizing virtual viewpoint at decoding end. Therefore, 3D-HEVC has proposed a depth coding algorithm based on the optimal quality of virtual view. The intermediate depth of encoding needs to calculate the distortion of the view of six synthetic virtual positions. In the current rate-distortion criterion, six view distortion uses the equal weight mechanism. Because the positions of 0.2525 and 0.75U 1.75 are relatively close to the left and right view, respectively, the distortion is smaller, while the relative distortion of the middle position 0.5 and 1.5 is relatively large. Therefore, these two distortion weights can be given to select the coding mode with minimum distortion more accurately. In this paper, 11 groups of different weights have been designed for experimental test. The preliminary experimental results show that, Increasing the weight of 0.5 and 1.5 positions under the larger QP can increase the overall synthetic mass. Under each QP, a group of better weight values can be selected, and the average weight of the composite viewpoint can be increased by 0.05. Through a large number of experiments, In this paper, the relationship between different QP and better weight is fitted to improve the quality of composite viewpoint.
【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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