二維手震估計影像穩定系統

Image Sequence Stabilization Using 2D Hand-Shake Estimation

鄭馥銘(Fu-Ming Jheng)

指導教授 ： 楊士萱

國立臺北科技大學/機電學院/資訊工程系所/碩士(2005年)

摘要

於本論文中，我們提出一套新的數位影像穩定系統演算法，可以有效消除數位攝影機拍攝的影像序列中非自願的手震運動向量。有別於過去文獻中所提出水平與垂直方向分別獨立處理的技術，本論文進一步考慮手震向量在二維空間的運動方式。本數位影像穩定系統其它的優點包括：低複雜度多重解析動作估計、改良的動作向量驗證法則、以及向量更正的飽和預防。本系統在效能改善方面，除了主觀的評量舒適感之外，並利用H.264編/解碼器來探討品質與壓縮效能的改進。實驗結果驗證了本影像穩定系統效能上的優越性。

關鍵字

數位影像穩定系統 ； 動作估計 ； 二維手震估計 ； 向量更正

並列摘要

In this thesis, we propose a new Digital Image Stabilization (DIS) algorithm that removes involuntary hand movements from the video sequences taken by a camcorder. In contrast to the known DIS techniques in the literature that perform the hand-shake estimation independently on the horizontal and vertical directions, the proposed method further considers the hand shake in the two-dimensional space. Other merits of the proposed DIS methods include: a reduced-complexity multi-resolution motion-estimation method, improved validation criteria for motion vectors, and a saturation-prevention motion correction mechanism. Performance evaluation of the system is conduced based on the perceptual quality and PSNR improvements in conjunction with an H.264 codec. Extensive experimental results substantiate the superiority of the proposed DIS algorithm.

並列關鍵字

Digital Image Stabilization ； Motion Estimation ； 2D Hand-Shake Motion Estimation ； Motion Correction

參考文獻

[19] R. Li, B. Zeng and M. L. Liou, “A new three-step search algorithm for block motion estimation,” IEEE Trans.Circuits Syst. Video Technol., vol. 4, pp. 438-443, Aug 1994.

[1] A. Engelsberg and G. Schmidt, “A comparative review of digital image stabilising algorithms for mobile video communications,” IEEE Trans Consumer Electronics, Aug. 1999, 591 - 597.

[2] K.S. Cho, J.S. Kim, J.W. Kim, S.H. Lee and S.J. Ko, “An efficient digital image stabilizing technique for mobile video communications,” Consumer Electronics ICCE. 2000 Digest of Technical Papers. 2000

[3] S. Erturk, “Image sequence stabilisation: motion vector integration (MVI) versus frame position smoothing (FPS) ,” In Proceedings of the IEEE on Image and Signal Processing and Analysis. June 2001, 266 – 271

[4] F. Vella, A. Castorina, M. Mancuso and G. Messina, “Digital image stabilization by adaptive block motion vectors filtering,” IEEE Trans Consumer Electronics, Aug. 2002, 796 – 801