本文關(guān)鍵詞： 人臉動畫 MPEG-4人臉動畫標(biāo)準(zhǔn) Mesh-Warping算法 語音識別 圖像拼接 圖像融合 膚色模型 特征點定位　出處：《中國科學(xué)技術(shù)大學(xué)》2009年碩士論文　論文類型：學(xué)位論文

【摘要】： 人臉動畫是廣泛應(yīng)用于計算機動畫行業(yè)、游戲行業(yè)、遠程會議、代理和化身等許多領(lǐng)域,是近幾年來國內(nèi)外研究的熱點。其中,基于單幅圖像的人臉動畫的研究近年來引起了許多研究者的關(guān)注�；趩畏鶊D像的人臉動畫,對給定的一幅圖像進行幾何位置上的變換,能產(chǎn)生一些有趣的視覺效果,在影視娛樂、廣告設(shè)計中常用來產(chǎn)生特技。 基于單幅圖像的人臉動畫由于是在真實人臉圖片的基礎(chǔ)上做圖像變形而產(chǎn)生,所以具有較高的真實感。本文提出并實現(xiàn)的一種基于單幅圖像的人臉動畫生成系統(tǒng),在MPEG-4人臉動畫標(biāo)準(zhǔn)的基礎(chǔ)上,采用了膚色模型等人臉特征點定位技術(shù)和Mesh-Warping的圖像變形方法生成人臉動畫,在口腔/眼球的處理上采用了圖像拼接和融合方法,使得生成的人臉動畫在保證實時性的同時獲得了較為逼真的動畫效果,本文主要內(nèi)容包括: 1)調(diào)研并總結(jié)了人臉動畫中的MPEG-4人臉動畫標(biāo)準(zhǔn)、人臉特征點定位、圖像變形和圖像拼接融合技術(shù),分析對比了這些技術(shù)的優(yōu)缺點。 2)實現(xiàn)了一個具有較高真實感和實時性的基于單張人臉圖像的人臉動畫生成系統(tǒng)。將MPEG-4中的人臉動畫標(biāo)準(zhǔn)簡化后應(yīng)用到基于單張人臉圖像的2D人臉動畫生成中。可對人臉進行自動/手動定位。選用了Mesh-Warping算法對圖像進行變形,既保持了較高真實感,又能滿足系統(tǒng)的實時性要求。 本文的主要創(chuàng)新有: 1)在Mesh-Warping變形算法中,根據(jù)人臉器官運動的特殊性,在構(gòu)造變形樣條時,提出了整體樣條和局部樣條結(jié)合,橫向樣條和縱向樣條分離的方法。在保持圖像變形效果的同時,盡可能的減少了運算時間。 2)提出了在極坐標(biāo)上基于樣條插值的人臉器官拼接算法。該算法可以較快的完成人臉口腔/眼睛器官樣本圖像與人臉圖像的拼接和融合,使動畫中出現(xiàn)張嘴效果時,能看較為清楚較為自然地看到舌頭和牙齒等原圖沒有的器官。并且算法具有靈活性,通過選用不同的樣條,可以在變形效果和計算時間之間尋找符合用戶要求的折中點。 3)通過該拼接融合算法,能將樣本圖像上的眼睛移植到原圖像上,以滿足某些特殊的動畫要求,并且移植后的眼睛在眨眼時能保持形狀不變,還可以做出像對眼這樣的眼球運動的動畫。
[Abstract]:Face animation is widely used in computer animation industry, game industry, teleconferencing, agent, avatar and many other fields. In recent years, the research of face animation based on single image has attracted the attention of many researchers. Based on single image, the geometric position of a given image can be transformed, which can produce some interesting visual effects. In film and television entertainment, advertising design is often used to produce special effects. The face animation based on single image has a high sense of reality because it is based on the deformation of real face image. This paper proposes and implements a face animation generation system based on single image. On the basis of MPEG-4 face animation standard, face animation is generated by skin color model and Mesh-Warping image deformation method, and image stitching and fusion are used in oral / eyeball processing. So that the generated face animation not only guarantees real-time, but also gets a more realistic animation effect. The main contents of this paper are as follows:. 1) the MPEG-4 face animation standard, face feature point location, image deformation and image mosaic fusion technology in face animation are investigated and summarized, and the advantages and disadvantages of these techniques are analyzed and compared. 2) A face animation generation system based on single face image with high realism and real time is implemented, and the face animation standard in MPEG-4 is simplified and applied to 2D face animation generation based on single face image. The face can be automatically / manually located. The Mesh-Warping algorithm is used to deform the image. It not only keeps a high sense of reality, but also meets the real-time requirements of the system. The main innovations of this paper are:. 1) in the Mesh-Warping deformation algorithm, according to the particularity of face organ motion, a new method of combining global spline and local spline, separating transverse spline and longitudinal spline, is proposed in the construction of deformed spline, which keeps the effect of image deformation at the same time. Minimizes computational time as much as possible. 2) an algorithm of facial organ splicing based on spline interpolation in polar coordinates is proposed. This algorithm can quickly complete the stitching and fusion of human face oral / eye organ sample image and face image, so that when the mouth opening effect appears in the animation, We can see clearly and naturally the organs in the original images such as tongue and teeth, and the algorithm is flexible. By selecting different splines, we can find a compromise point between the deformation effect and the computing time. 3) through the fusion algorithm, the eyes on the sample image can be transplanted to the original image to meet some special animation requirements, and the transplanted eyes can keep the same shape in the blink. You can also animate eye movements like eye-to-eye movements.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2009
【分類號】：TP391.41

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1 倪奎;人臉器官拼接融合及其在人臉動畫中的應(yīng)用[D];中國科學(xué)技術(shù)大學(xué);2009年

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