CASIA OpenIR  > 毕业生  > 博士学位论文
Thesis Advisor潘春洪
Degree Grantor中国科学院研究生院
Place of Conferral北京
Keyword重复结构检测 对称性检测 建筑立面图像标注 建筑立面图像解析

1. 提出了基于显式矩阵分解的方法。该方法使用矩阵乘法模型描述重复结构对齐性。具体地,各重复结构被视作一个重复模式与两个分块矩阵的乘积。那两个分块矩阵是由交替的零矩阵与单位阵组成的,并且分别记录了重复结构的竖直水平位置。基于这一模型,检测重复结构转化为求解那两个分块矩阵的矩阵分解问题。为求解该矩阵分解问题,一种优化算法被提出,其中动态规划被用于优化分块矩阵。大量的实验结果表明了提出模型的有效性。

2. 提出了基于定位提取与优化的方法。这种方法的特点是无需任何标注数据而检测重复结构。该方法包含三步。第一,由于建筑结构通常是矩形的,实施矩形检测。第二,从检测矩形中,对应于真正建筑结构的矩形被提取。第三,基于已提取的矩形结构,一个优化问题被提出以寻找所有的重复结构。为求解该优化问题,一种高效的基于动态规划的算法也被设计。大量的实验结果证实了提出方法的有效性。

3. 提出了基于基准线提取的方法。因为重复结构是水平竖直对齐的,它们能够被经过重复结构边缘的水平竖直的基准线所定位。基于这一观察,该方法提出提取这些基准线,从而检测重复结构。首先,候选直线被检测,包含了所有的基准线与众多经过墙壁或重复结构的直线。然后,为了筛选基准线,该方法提出一个极大后验问题,用以度量筛选直线定位重复结构的概率。最后,该问题被一种基于动态规划的算法求解。大量的定性定量结果证实了提出方法的有效性。

4. 提出了基于分布距离最大化的方法。由于重复结构通常是矩形的,而且是水平竖直对齐的,本方法提出使用经过重复结构边缘的基准线约束重复结构的分割。重复结构分割问题被数学表述为一个约束优化问题。其中,通过最大化前景与背景的颜色分布之间的距离,基准线所决定的分割被优化。为求解该优化问题,一种基于动态规划的算法被提出。两个公开数据集上的实验结果证实了提出方法的可行性与有效性。
Other AbstractFacade repetition detection is an important task in facade image understanding. This task can facilitate many computer vision problems, including building modeling and 3D reconstruction, facade image analysis, urban scene understanding and so on. However, this problem has the following three difficulties. First, for repetitive structures on facades of different architectural styles, there is usually significant discrepancy among their appearances and layouts. This limits the generality of repetition detection approaches. Second, among the repetitions on a single facade, there are usually appearance variations caused by blind slides, shutter rotations and so on. Third, facade images are often degraded due to corruptions including occlusions, glass reflections and changing illuminations. Because of the above two difficulties, it becomes difficult to measure the similarities between the repetitions. To deal with the above difficulties, the property that facade repetitions are horizontally and vertically aligned requires to be utilized. For this purpose, this thesis proposes two models describing the alignment property, namely a matrix multiplication based model and fiducial lines passing along repetition boundaries. Combining with the shape, color and other features of the facade repetitions, this thesis proposes several effective approaches for repetition detection. Specifically, the main contributions of this thesis contain the following four aspects.

1. An explicit matrix factorization based approach is proposed. This approach utilizes a matrix multiplication based model to describe the alignment property among the facade repetitions. That is, the repetitions are viewed as the product of a repetitive pattern and two block matrices. The two block matrices are composed of alternating zero matrices and identity matrices, and record the vertical and horizontal positions of the repetitions respectively. Based on the model, repetition detection turns into a matrix factorization problem which optimizes the block matrices. An optimization algorithm is thus developed to solve the matrix factorization problem, where dynamic programming is used to optimize the block matrices. Extensive experiments demonstrate the effectiveness of the approach.

2. By localization, extraction and symmetry based optimization, an approach is proposed. This approach is characterised by detecting repetitions without requiring any labeled data. The approach contains three main modules. First, rectangle detection is conducted as facade structures are usually rectangular. Second, from the detected rectangles, the rectangles corresponding to real facade structures are extracted. Third, based on the extracted rectangular structures, an optimization problem is formulated to find all the repetitive structures. To solve the optimization problem, an efficient dynamic programming based algorithm is also developed. Comprehensive experimental results demonstrate the validity and effectiveness of the proposed approach.

3. An approach based on fiducial lines extraction is proposed. Since repetitions are horizontally and vertically aligned, they can be localized by the horizontal and vertical lines passing along the repetition boundaries. Based on the observation, the approach proposes to detect repetitions by extracting these fiducial lines. First, candidate lines are detected, containing both all the fiducial lines and many mistaken lines passing across facade wall or repetitive structures. Then, to pick out the fiducial lines, a maximum a posterior problem is formulated to measure the probabilities that the lines can localize the repetitions. Finally, the problem is efficiently solved by a dynamic programming based algorithm. Extensive qualitative and quantitative results verify the effectiveness of the approach.

4. An approach based on distribution distance maximization is proposed. Since the repetitions are generally rectangular, and horizontally and vertically aligned, this approach proposes to use fiducial lines, namely the horizontal and vertical lines passing along the repetition boundaries, to constrain the repetition segmentation. The problem of facade repetition segmentation is finally formulated as a constrained optimization problem, in which the segmentation determined by the fiducial lines is optimized by maximizing the distance between the foreground/background color distributions. An efficient dynamic programming based algorithm is also developed to solve the optimization problem. Experimental results on two publicly available datasets demonstrate the feasibility and validity of the proposed approach.
Document Type学位论文
Recommended Citation
GB/T 7714
肖鸿飞. 建筑立面图像重复结构检测方法研究[D]. 北京. 中国科学院研究生院,2017.
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