本論文針對車載型攝影機之應用，提出影像穩定化(image stabilization)的技術，主要目的在於補償架設於車上之攝影器材因晃動而造成不穩定的影像序列。在影像穩定化過程中，可以分成三步驟：道路標線的偵測(lane marking detection)，攝影機運動的估測(camera motion estimation)及運動的平滑化(motion smoothing)。首先從輸入影像中偵測出兩條道路標線與消逝點(vanishing point)。接著利用兩條道路標線與消逝點來估測攝影機的運動參數，如此不但可以避免一般方法所遇到特徵點擷取與像點對應比對的問題，同時所得到的道路資訊也可用於後續之處理工作。接下來我們再利用運動平滑化來消除不要之攝影機運動以修正影像序列，使其顯得穩定。我們以模擬影像及真實影像來驗証所提出的方法。

The paper presents an image stabilization technique to stabilize the image sequences taken from a camera mounted on a moving vehicle. The proposed technique includes three steps: lane marking detection, camera motion estimation, and motion smoothing. First, we detect two lane markings and the vanishing point from the input image. These two lane markings and the vanishing point are used to calculate the values of the camera motion parameters. The proposed motion estimation can avoid the issues on the feature point extraction and the corresponding matching, and the obtained road information can be applied to the further work. Finally, the motion smoothing is used to separate smooth and non-smooth motion, and then the stabilized image sequences can be obtained. Experimental results for all steps using simulated or real images are presented.

[1]Intelligent Transportation System(ITS),http://www.iot.gov.tw/its/, 1999.
[Bas97] E. K. Bas and J. D. Crisman, “An Easy to Install Camera Calibration for Traffic Monitoring”, IEEE Conference on Intelligent Transportation System, pp. 362-366,1997.
[Ber97] M. Bertozzi and A. Broggi, “Vision-Based Vehicle Guidance”, Computer Vision, Vol. 30, pp. 49-55, July 1997.
[Ber98] M. Bertozzi and A. Broggi, “GOLD: A Parallel Real-Time Stereo Vision System for Generic Obstacle and Lane Detection”, IEEE Transactions on Image Processing, Vol. 7, No. 1, pp. 62-81, 1998.
[Bur94] P. J. Burt and P. Anandan, “Image Stabilization by Registration to a Reference Mosaic”, Proceedings of ARPA on Image Understanding Workshop, pp. 425-434, 1994.
[Dav94] L. S. Davis, R. Bajcsy, M. Herman, and R. Nelson, “RSTA on the Move”, Proceedings of ARPA on Image Understanding Workshop, pp. 435-456, 1994.
[Dur96] Z. Duric and A. Rosenfeld, “Image Sequence Stabilization in Real Time”, Real-time Imaging, Vol. 2, No. 5, pp. 271-284, 1996.
[Egu95] Y. Egusa, H. Akahori, A. Morimura, and N. Wakami, “An Application of Fuzzy Set Theory for an Electronic Video Camera Image Stabilizer”, IEEE Transactions on Fuzzy Systems, pp. 351 –356, 1995.
[Ert00] S. Erturk and T. J. Dennis, “Image Sequence Stabilisation Based on DFT Filtering”, Proceedings of IEE on Vision, Image and Signal Processing, Vol. 147, pp. 95–102, 2000.
[Han94] M. Hansen, P. Anandan, K. Dana, G. van der Wal, and P. Burt, “Real-time Scene Stabilization and Mosaic Construction”, Proceedings of the Second IEEE Workshop on Applications of Computer Vision, pp. 54–62, 1994.
[Har92] R. M. Haralick and L. G. Shapiro, “Computer and Robot Vision”, Vol. 1, pp.32-33, 1992.
[Jeo01] S. G. Jeong, C. S. Kim, K. S. Yoon, J. N. Lee, J. I. Bae, and M. H. Lee, ”Real-Time Lane Detection for Autonomous Navigation”, Proceedings of the IEEE Intelligent Transportation System Conference, Oakland(CA), USA, pp. 508-513, August 2001.
[Jia00] G. Y. Jiang, T. Y. Choi, S. K. Hong, J. W. Bae, and B. S. Song, ”Lane and Obstacle Detection Based on Fast Inverse Perspective Mapping Algorithm”, IEEE International Conference on Systems, Man, and Cybernetics, Vol. 4, pp. 2969-2074, 2000.
[Jin00] J. S. Jin, Z. Zhu, and G. Xu, “A Stable Vision System for Moving Vehicles”, IEEE Transactions on Intelligent Transportation Systems, Vol. 1, No. 1, pp. 32-39, 2000.
[Kam89] Behzad Kamgar-Parsi, Behrooz Kamgar-Parsi, and N. S. Netanyahu, “A Nonparametric Method for Fitting a Straight Line to a Noisy Image”, IEEE transactions on Pattern Analysis and Machine Intelligence, Vol. 11, No, 9, pp. 998-1001, September 1989.
[Kur00] R. Kurazume and S. Hirose, “Development of Image Stabilization System for Remote Operation of Walking Robots”, Proceeding of IEEE International Conference on Robotics and Automation, San Francisco, CA, Vol.2, pp. 1856-1861, 2000.
[Lia01] Y. M. Liang, S. W. Chen, and H. Y. Mark Liao, “Image Stabilization for ITS Applications”, Chinese CVGIP 2001, Kenting, PingTung, Taiwan, 2001.
[Mar01] L. Marcenaro, G. Vernazza, and C. S. Regazzoni, “Image Stabilization Algorithms for Video-surveillance Applications”, Proceedings of International Conference on Image Processing, Vol. 1 , pp. 349–352, 2001.
[Mar01] E. Martinez and C. Torras, “Qualitative vision for the guidance of legged robots in unstructured environments”, Pattern Recognition, Vol. 34, pp. 1585-1599, 2001.
[Mor96] C. Morimoto and R. Chellappa, “Fast Electronic Digital Image Stabilization for Off-Road Navigation”, Real-time Imaging, Vol. 2, No. 5, pp. 285-296, 1996.
[Mor97] C. Morimoto and R. Chellappa, “Fast 3D Stabilization and Mosaic Construction”, IEEE Computer Society Conference on Computer Vision and Pattern Recognition, pp. 660-665, 1997.
[Pai92] J. K. Paik, Y. C. Park, and D. W. Kim, “An Adaptive Motion Decision System for Digital Image Stabilizer Based on Edge Pattern Matching”, IEEE Transactions on Consumer Electronics, Vol. 38, No. 3 , pp. 607-616, 1992.
[Rat98] K. Ratakonda, “Real-time Digital Video Stabilization for Multi-Media Applications”, Proceedings of the IEEE International Symposium on Circuits and Systems, Vol. 4, pp. 69–72, 1998.
[Sch92] H. Schneiderman and M. Nashman, “Visual Processing for Autonomous Driving”, Proceeding of IEEE Workshop on Applications of Computer Vision, pp. 164-171, 1992.
[Tuc93] J. C. Tucker and A. de Sam Lazaro, “Image Stabilization for a Camera on a Moving Platform”, IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, Vol. 2, pp. 734-737, 1993.
[Uom90] K. Uomori, A. Morimura, H. Ishii, T. Sakaguchi, and Y. Kitamura, “Automatic Image Stabilizing System by Full-digital Signal Processing”, IEEE Transactions on Consumer Electronics, Vol. 36, No. 3, pp. 510–519, 1990.
[Wan00] Y. Wang, D. Shen, and E. K. Teoh, “Lane Detection Using Spline Model”, Pattern Recognition Letters, Vol. 21, pp. 677-689, 2000.
[Yao97] Y. S. Yao and R. Chellappa, “Selective Stabilization of Images Acquired by Unmanned Ground Vehicles”, IEEE Transaction on Robotics and Automation, Vol. 13, No. 5, pp. 693-708, 1997.
[Yeh00] Y. M. Yeh, H. C. Chiang, and S. J. Wang, “A Digital Camcorder Image Stabilizer Based on Gray Coded Bit-plane Block Matching”, The 13th IPPR Conference on Computer Vision, Graphics and Image Processing, Taipei, Taiwan, pp. 244-251, 2000.