The basic idea of model - based light map is to explore the captured facial reflection model and recovering light map from a single picture 基于模型的光照?qǐng)D的基本思想是利用已經(jīng)獲得的人臉反光模型,從單張人臉照片恢復(fù)出人臉?biāo)趫?chǎng)景的光照?qǐng)D。
This algorithm needs a height map and the camera ' s information . light map is used to adjust the surface ' s brightness that avoids some noise effect due to the phong lighting mode . all these strategies are let to the effort to improve the render application ' s reality 采用lod技術(shù),當(dāng)繪制較遠(yuǎn)處的物體時(shí)使用簡(jiǎn)化的模型,并采用粗略的紋理采樣技術(shù),繪制近處的物體時(shí)使用詳細(xì)的模型,并采用線性采樣,這種技術(shù)符合人們觀察物體的習(xí)慣,大大縮小了計(jì)算量。
This technique can find applications in image composition and some facial animation system . for a picture with a face , mbl can recover the light map of the face and then a new face or any other synthetic object can be rendered into the scene smoothly in terms of illumination 這個(gè)技術(shù)可以應(yīng)用到照片合成中去,對(duì)一張帶人臉的照片,恢復(fù)出其光照?qǐng)D,然后可以利用恢復(fù)的光照?qǐng)D把新的人臉或其它物體合成到這張照片中去,這樣可以緩和照片合成中的光照不協(xié)調(diào)問題。
In the first part , the reflection model of a particular face is captured firstly and structured as a collection of reflection functions . and then , with the help of luxmaster , the rendering tool , where a light map represents a lighting condition , a variety of faces with different expression are rendered under changing illumination 在不同表情不同光照下的真實(shí)感人臉繪制部分,首先對(duì)人臉反光模型進(jìn)行采樣,并把采樣數(shù)據(jù)組織成反光函數(shù),然后應(yīng)用工具luxmaster生成不同光照下的各種表情的真實(shí)感繪制,其中光照條件用光照?qǐng)D來(lái)表示。
Finally , this thesis introduces the model - based light map ( mbl ) technique and its basic idea and framework . in order to capture the facial reflection model efficiently , a 3d light stage with 1 . 5 - meter radius is custom - built . a basic recovering algorithm based on conjunction gradient method is described and some results are provided 先提出了基于模型的光照?qǐng)D技術(shù)的基本思想和框架,然后介紹自行設(shè)計(jì)建造的一個(gè)半徑為1 . 5米的三維光照架,和一個(gè)基于共軛梯度法的光照?qǐng)D恢復(fù)算法。