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基于表面局部最高点估计的明暗恢复形状算法

DOI: 10.11834/jig.20090532

Keywords: 明暗恢复形状,强约束,针图,表面局部最高点估计,梯度方向调整

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Abstract:

基于数据逼近强约束的针图恢复算法是近年来提出的一种较为成功的从明暗恢复形状(shapefromshading)的算法,但由于该算法在非垂直光线下得到的初始化针图的误差较大,并且不能保证法向量有解或有唯一解,为了解决SFS算法存在的问题,提出了一种改进的SFS算法。该改进算法从分析非垂直光线下图像梯度图与针图之间的关系入手,首先检测图像局部最亮点位置;然后根据照度方程估计表面局部最高点的位置,同时对梯度方向进行调整,并建立方程组;最后针对方程组解的不同情况,提出了相应的处理方法。改进后的算法,对于垂直光线和非垂直光线下的情况同样有效,从而扩大了基于数据逼近强约束的SFS算法的适用范围。从合成图像和实际图像的实验结果可以看出,采用改进的算法可以得到比基于数据逼近强约束的算法更接近真实表面的初始化针图和初始化高度。

References

[1]  Brooks M J, Horn B K P. Shape and source from shading [ A]. In : Proceedings of International Joint Conference on Artificial Intelligence [C], Los Angeles, CA, USA, 1985:932-936.
[2]  Horn B K P, Brooks M J. The variational approach to shape from shading [J]. Computer Vision, Graphics, and Image Processing, 1986, 33(2) :174-208.
[3]  Horn B K P, Brooks M J. Shape from Shading [M]. Cambridge, MA,USA: MIT Press,1989.
[4]  Worthington P L, Hancock E R. New constraints on data-closeness and needle map consistency for shape-from-shading [J]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 1999, 21(12) :1250-1267.
[5]  Castel6n M, Hancock E R. Acquiring height maps of faces from a single image [ A ] . In: 2nd International Symposium on 3D Data Processing, Visualization, and Transmission [C] , Thessaloniki, Greece, 2004 : 183-190.
[6]  Ragheb H, Hancock E R. A probabilistic framework for specular shape-from-shading [J] . Pattern Recognition, 2003, 36 ( 2 ) : 407-427.
[7]  Ragheb H, Hancock E R. Darboux smoothing for shape-from-shading [J]. Pattern Recognition Letters, 2003,24( 1-3 ) : 579-595.
[8]  Bors A G, Hancock E R, Wilson R C. Terrain analysis using radar shape-from-shading [J]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 2003, 25 ( 8 ) :974-992.
[9]  Ribeiro E, Robles-Kelly A, Hancock E R. Detecting multiple texture planes using local spectral distortion [J]. Image and Vision Computing , 2002,20(9-10) : 739-750.
[10]  Smith W A P, Robles-Kelly A, Hancock E R. Facial view synthesis from a single using shape from shading [ A]. In: Proceedings of 2nd International Symposium on 3D Data Processing, Visualization and Transmission [C], Thessalonlki, Greece, 2004 : 510-517.
[11]  Worthington P L, Hancock E R. Coarse view synthesis using shape- from- shading [J]. Pattern Recognition,2003,36 ( 2 ) :439-449.
[12]  Worthington P L. Novel view synthesis using needle-map correspondence [ A ]. In : Proceedings of 13th British Machine Vision Conference[C], Wales, UK ,2002:718-727.
[13]  Worthington P L, Hancock E R. View synthesis from needlemaps [ A ]. In: 15th International Conference on Pattern Recognition (ICPR\\'00) [C], Barcelona, Spain ,2000,4 : 110-113.
[14]  Worthington P L, Hancock E R. Histogram-based object recognition using shape- from- shading [ A ]. In : Proceedings of IEEE Conference on Computer Vision and Pattern Recognition[C], Hilton Head Island, SC, USA,2000,1:643-648
[15]  Worthington P L, Hancock E R. Region- based object recognition using shape-from-shading [ A].In: Proceedings of 6th European Conference on Computer Vision [C], Dublin, Ireland, 2000: 455-471.
[16]  Worthington P L, Hancock E R. Object recognition using shape-from- shading [ J ]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 2001,23 ( 5 ) : 535 -542.
[17]  Zhang R, Tsai P S, Cryer J E, et al. Analysis of shape from shading techniques [ A ]. In: Proceedings of IEEE Conference on Computer Vision and Pattern Recognition [C], Seattle, WA, USA, 1994: 377-384.
[18]  Wei T, Klette R. Height from Gradient Using Surface Curvature and Area Constraints [ A ]. In: Proceedings of 3rd Indian Conference on Computer Vision, Graphics and Image Processing[C] , Ahmedabad, India, 2002:204-210.

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