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双目立体视觉深度感知与三维重建若干问题研究
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摘要
双目立体视觉是计算机视觉研究领域的重要分支之一,它通过直接模拟人类视觉系统的方式感知客观世界,广泛应用于微操作系统的位姿检测与控制、机器人导航与航测、三维非接触测量及虚拟现实等领域。因此,对双目立体视觉的深度感知与三维重建中的若干问题进行研究具有一定的理论价值和十分重要的现实意义。论文围绕双目立体视觉系统摄像机标定技术、匹配策略与匹配算法、深度信息提取及后续处理、重建方法等重点与难点问题展开研究。论文的主要工作包括以下几个方面。
     (1)在对传统摄像机标定方法进行分析的基础上,提出基于棋盘平面方格的半自动摄像机标定方法。该方法以Tsai的两步标定方法为基础,对单个摄像机先进行线性求解,再对该解进行基于最大似然标准的非线性求精;考虑到镜头径向畸变,采用非线性优化方法提高标定精度;最后采用所求的单个摄像机的旋转矩阵以及平移向量进行双目摄像机的标定。该标定方法只需要摄像机拍摄模板平面在两个以上不同方向的图像,模板可以自由的运动,无需其运动的参数。实验结果表明该标定方法灵活,操作简单,且能满足实验精度的要求。
     (2)针对区域匹配的速度与精度以及匹配窗口大小难以选择等问题,提出一种基于窗口代价函数的自适应窗口立体匹配算法。为了解决抗噪与视差不连续处误匹配问题,将ρσ(n)函数与四方向线形掩膜技术相结合构造新的相似性测度函数;根据匹配窗口内误差均值、误差方差及大窗口偏移来确定窗口内的像素是否都具有相同视差来构造窗口代价函数,由此窗口代价函数确定匹配窗口尺寸,形成自适应窗口;引入整数图像技术以提高算法的计算效率;为了实现区域匹配全局最优,将遗传算法引入到所设计的自适应窗口匹配算法中。实验结果表明,所提出的匹配算法能较好解决视差不连续区域和遮挡区域的误匹配问题,提高了匹配精度。
     (3)为了利用区域匹配视差图的致密性以及特征匹配视差图的鲁棒性,将两种算法结合起来提出了一种基于Harris角点与区域联合的立体匹配算法。针对经典Harris角点检测算子对尺度比较敏感的缺点,提出了一种具有尺度不变特征的Harris角点提取方法,该方法以尺度空间为基础,将空间和尺度两个域中的极值点确定为角点;为了满足不同尺度下提取角点特征的要求,对Harris的图像亮度自相关矩阵M增加了尺度自适应的处理;针对特征匹配得到视差图稀疏问题,结合区域匹配算法以及视差梯度约束,获得致密的视差图像。实验结果表明,所提出的联合的匹配算法可得到致密的视差图,并在边缘等视差不连续区域可获得较好的匹配精度,验证了算法的有效性和可行性。
     (4)针对由于匹配误差及标定偏差等原因带来深度图不平滑,深度图的边界与物体边界不对齐等问题,提出一种深度图像结合原始图像的三步联合双边滤波的深度后处理方法,该方法先对原始图像进行双边滤波,再结合原始图像对深度图像进行双边滤波,最后,将两次得到的双边滤波结果再次联合对深度图像进行双边滤波。深度的感知测量与三维重建是立体视觉的最终目标,对基于双目视差的非接触式3D测量与深度提取方法进行了研究与推导,在基于MFC的OpenGL开发平台上,采用局部三维Delaunay的网格构造算法,对标准图像库以及实测数据进行深度提取与三维重建。实验结果表明,所提出的深度后处理方法能有效地实现深度平滑与图像对齐,三维重建较好的直观效果也表明所提出的标定方法、匹配方法以及深度后处理方法的可行性和有效性。
Binocular Stereo vision is an important branch of field of Computer Vision. It simulates the visual system of the human being to perception objective world, which is widely applied into many fields, such as position detection and control of the micro-operation system, robot navigation and aerial survey, three-dimension non-contact measure,virtual reality and so on. So it has important theory value and real significant to study on some issues of depth perception and three dimension reconstruction from binocular stereo vision. Focusing on camera calibration, match strategy and matching algorithm, depth information calculation and three dimension reconstructions based on Open GL, the author had done amount of researches on these aspect. The followings are the main researching content in the paper.
     (1) On the basis of analysis of the traditional camera calibration methods, a semi-auto camera calibration method based on a plane plaid was proposed. The calibration method based on Tsai's two steps calibration method calculated the linear solution for a single camera. And then the solution was refined by maximum likelihood standard. Considering the radial distortion of the camera the nonlinear optimization was used to enhance the accuracy of the calibration result. The rotate matrix and translate vector of a single camera was applied into the calibration of the stereo visual system. The proposed calibration method only needed two or more images of the plane plaid from different angles. The plane plaid can move freely without any moving parameters. And the operation of the proposed method was simple but effective. Several experiment results show that the proposed calibration method is feasible and can satisfy the accuracy.
     (2) Aiming at matching speed and window size selecting problems of area-based matching an adaptive window size matching algorithm based on cost function of the window was proposed. In order to solve the noise and miss matching at the discontinuous region, a novel similarity measure function was designed using ρσ(n) function combined the four-direction line mask. We used error mean and variance of matching window and big window shift to judge that the disparity values of the window were same or nearly same. According with disparity distribution of the window the cost function was built and was applied to determine the window size adaptively. And integer image technique was introduced into the algorithm for enhance the matching efficient. In order to get global optimal matching for certain region block Genetic algorithm was introduced to the adaptive window matching algorithm. Several experiments results show that the proposed stereo matching algorithm could well solve the disparity discontinuity and occlusion problems. And the accuracy of matching was greatly improved by modified Genetic algorithm that is a global optimum method.
     (3) Generally area matching algorithm can get dense disparity. But it couldn't work well at edge. And feature matching algorithm has better robust at feature points matching except that disparity image is sparse. According to the merits and disadvantage of both area matching and feature matching a hybrid matching algorithm combined Harris corner matching and area-based matching was proposed. Considering that classic Harris corner detection algorithm was sensitive to scale changing, an improved Harris feature extraction algorithm was proposed. The improved method was on base of space and scale, which had scale invariance. The pixel at which extremum could be gotten both in the image space and scale space would be considered as a corner feature point. And the self-relative matrix M of image brightness in Harris algorithm was introduced scale adjusting adaptively for extract the corners under different scales. Considering the disparity of feature matching was sparse, we combined with area matching and constraints of disparity gradient. A dense disparity image was gained by the proposed matching scheme. Several experiments show that the proposed hybrid matching algorithm based on area and feature matching could get dense disparity image. And a good matching accuracy at disparity discontinues edge. In a word the proposed algorithm was valid and feasible.
     (4) Generally the depth image gotten from the form was unsmooth because of matching error and calibration bias. And some edges of the depth image were not aligned to those of the original image. Aiming at those problems a depth post-processing method was proposed, which was combined the original image and depth image to filter the depth image by three-step joint bilateral filter. The proposed method firstly used bilateral filter on the original image. And then the joint bilateral filter combined with original image was done on depth image. Finally the results of two times filters were joined together and filtered the depth image by bilateral filter again. Depth perception and measure and three dimension reconstruction are aims of stereo vision. We also have done some works on non-contact measure method of three dimensions and deduced the depth computing formula. Finally the grid building algorithm of local3D Delaunay was applied to visualize the three dimensions and depth image by OpenGL combined with MFC developing platform. Some experiments have done on both standard test data and real data. The experiments results show that the proposed post-processing method can smooth the depth image and align the image validly. And several reconstruction results also shows that the proposed calibration methods, the proposed matching method and depth post-processing method are feasible and valid.
引文
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