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研究生:李庭育
研究生(外文):Teng Yok Lee
論文名稱:反射係數為主之兩階段光場壓縮法
論文名稱(外文):Reflentance-base Two-Stage Light Field Compression
指導教授:莊榮宏莊榮宏引用關係林正中林正中引用關係
指導教授(外文):Jung Hong ChuangCheng Chung Lin
學位類別:碩士
校院名稱:國立交通大學
系所名稱:資訊工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:51
中文關鍵詞:Image-based renderinglight field renderinglight field compression
相關次數:
  • 被引用被引用:0
  • 點閱點閱:274
  • 評分評分:
  • 下載下載:21
  • 收藏至我的研究室書目清單書目收藏:0
光場成像法是一種近年來廣受注目的影像為主成像架構,
其擁有容易取樣與成像等優點,
缺點在於需要大量的儲存空間;
而現有的光場壓縮法多半是將光場視是為取樣平面上的二維影像陣列,
成像時則將全部的影像逐一還原後再以投射式貼圖的機制顯示在到螢幕上,
如此一來將會需要大量的貼圖記憶體空間來儲存這些影像。
由於光場在成像平面上所取得的影像有對比簡單而且相似的特性,
本論文中便提出一套將光場表示為成像平面上的影像陣列的兩階段壓縮法。
首先量化各影像的頻譜來減少資料,
再將相鄰的影像所對應的係數聚集起來作進一步的編碼。
動態成像時只需要換原對應目前視點的顏色,
並可以利用快取的機制來提升顯示速度。
這個方法可以達到數百倍的壓縮率,
並且在壓縮率與成像速度之間達成一個平衡。

Light field rendering is one of the image-based rendering techniques
in computer graphics and has received a great deal of attention
due to its simplicity in data establishment and rendering for displaying,
though at the cost of enormous requirement on storage space.
In this thesis, a two-stage light field compression is proposed
for bringing down the space demand, in
which light field information are represented in such a way
that similarity across data modules can be fully exploited
for achieving remarkable compression rate,
together with a relative lower cost in the data reconstructing
and display rendering phase.
The proposed codec achieves compression ratio ranging from 300 to 1000,
and is able to decompress data for real time rendering.

1.緒論
1.1.研究範圍與動機
1.2.研究目標與構想
1.3.論文章節安排
2.相關研究
2.1.光場成像法 (Light Field Rendering)
2.2.光場壓縮法 (Light Field Compression)
2.2.1.區塊比對 (Block matching)
2.2.2.視差預估 / 補償 (Disparity estimation/compensation)
2.2.3.小波轉換 (Wavelet transform)
2.3.壓縮法間之比較
3.方法與實作
3.1.編碼器 (Encoder) 之設計與實作
3.1.1.DCT 之計算
3.1.2.決定量化階層
3.1.3.儲存係數之考量
3.1.4.光場串流之格式
3.1.5.多色頻 (Multi-color channel) 之考量
3.2.解碼器 (Decoder) 之設計與實作
3.2.1.利用掃描轉換計算投影座標
3.2.2.IDCT 之計算
3.2.3.利用快取加速
4.實驗與結果
4.1.系統規劃
4.2.壓縮率與品質之統計
4.2.1.平均所保留的 AC 係數數目與品質間的關係
4.2.2.第二階段壓縮演算法對壓縮率與品質間影響
4.3.成像速度之分析
4.3.1.解碼效率之測試
4.3.2.快取對成像速度的衡量
5.結論與未來方向
A.成像結果 Buddha4
B.成像結果 Dragon32

[1] Marc Levoy and Pat Hanrahan, ”Light eld rendering,” Proc. SIGGRAPH 96, pp.
31 - 42. August 1996.
[2] Steven J. Gortler, Radek Grzeszczuk, Richard Szeliski, and Michael F. Cohen, ”The
lumigraph,” Proc. SIGGRAPH 96, pp. 43 - 54. August 1996.
[3] Amir Said and William A. Pearlman, ”A new fast and ecient image codec based on
set partitioning in hierarchical trees,” IEEE Transactions on Circuits and Systems
for Video Technology, 6:243-250, June 1996.
[4] P. Sloan, M. Cohen, and S. J. Gortler, ”Time Critical Lumigraph Rendering,” Proc.
Symposium on Interactive 3D Graphics, pp. 17 - 24, 1997.
[5] M. Kiu, X. Du, R. Moorhead, D. Banks and R. Machiraju, ”Two-dimentional sequence
compression using MPEG,” Visual communication and image processing
(VCIP’98), pp. 914 - 921, Jan. 1998.
[6] M. Magnor and B. Girod, ”Hierarchical coding of light elds with displarity maps,”
Proc. IEEE Int. Conf. Image Processing (ICIP-99), Kobe, Japan, pp. 334 - 338,
October 1999.
[7] M. Magnor and B. Girod, ”Adaptive block-based light eld coding,” Proc. 3rd
International Workshop on Synthetic and Natural Hybrid Coding and Three-
Dimensional Imaging IWSNHC3DI’99, Santorini, Greece, pp. 140 - 143, Sep. 1999.
[8] Ingmar Peter and Wolfgang Straser, ”The wavelet stream: Progressive transmission
of compressed light eld data,” IEEE Visualization 1999 Late Breaking Hot Topics,
pp. 69 - 72. IEEE Computer Society, October 1999.
[9] Xin Tong and Robert Gray, ”Compression of light elds using disparity compensation
and vector quantization,” IASTED International Conference on Computer
Graphics and Imaging, pp. 300 - 305, Palm Springs, California, October 1999.
[10] M. Magnor and B. Girod, ”Data Compression for Light Field Rendering,” IEEE
Trans. Circuits and Systems for Video Technology, vol. 10, no. 3, pp. 338 - 343,
April 2000
[11] M. Magnor, A. Endmann, and B. Girod, ”Progressive compression and rendering
of light elds,” Proc. Vision, Modeling and Visualization VMV 2000, pp. 199 - 204,
Saarbr´’ucken, Germany.
[12] C. Zhang and J. Li, ”Compression of Lumigraph with multiple reference frame
(MRF) prediction and just-in-time rendering,” Proc. IEEE Data Compression Conf.
(DCC’2000), Snowbird, Utah, pp. 254 - 263, March 2000.
[13] Xin Tong and Robert Gray, ”Interactive view synthesis from compressed light elds,”
Image Processing, 2001. Proceedings. 2001 International Conference, vol.2, pp. 85
- 88, 2001.
[14] Ingmar Peter and Wolfgang Strasser ”The Wavelet Stream: Interactive Multi Resolution
Light Field Rendering,” Proc. 12th Eurographics Workshop on Rendering,
London, UK, pp. 262 - 273, June 2001.
[15] The Stanford Light Fields Archive. http://wwwgraphics.
stanford.edu/software/lightpack/lifs.html
[16] A. Gershun, ”The Light Field,” Moscow, 1936. Translated by P. Moon and G.
Timoshenko in Journal of Mathematics and Physics, Vol. XVIII, MIT, 1939, pp. 51
- 151.
[17] J. Ziv and A. Lempel, ”A universal algorithm for sequential data compression,”
IEEE Transactions on Information Theory, IT-23:337-343, 1977.
[18] Barry G. Haskell, Atul Puri, and Arun N. Netravali, ”Digital video: an introduction
to MPEG-2,” Chapman Hall, 1997.
[19] Rafael C. Gonzalez and Richard E. Woods, ”Digital image processing” Addison
Wesley, 1993.
[20] Alan V. Oppenheim and RonaldW. Schafer ”Discrete-time signal processing,” Prentice
Hall, 1998.
[21] George K. Wallace, ”The JPEG still picture compression standard,” IEEE Transactions
on Consumer Electronics, Vol. 38, No. 1, February 1992.
[22] Intel Image Processing Library,
http://developer.intel.com/software/products/perib/ipl/index.htm
[23] Intel JPEG Library,
http://developer.intel.com/software/products/perib/ijl/index.htm
[24] Zlib,
http://www.gzip.org/zlib/

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