摘要
为了准确提取出低分辨率外轮廓不规则的户外多障碍建筑图像目标区域,需要进行低分辨率户外多障碍建筑图像布局标定研究。但是采用当前方法进行建筑图像布局标定时,难以获取建筑图像特征点,存在建筑图像布局标定效果较差的问题。为此,提出一种基于双线性插值的低分辨率户外多障碍建筑图像布局标定方法。方法首先获取不同角度或者位置的标定板图像,通过标定板上的特征点和相应的户外多障碍建筑图像的单应性矩阵来确定摄像机的内部参数,进而计算出摄像机外部参数,以提高建筑图像分辨率,对预处理后的户外多障碍建筑图像和模板图像进行小波变换,提取户外建筑模板图像的第2层小波变换的圆投影特征向量,得到户外建筑图像候选目标,在高分辨率户外多障碍建筑图像上利用图像特征点和不变矩进行精匹配。最后选取欧式距离最小的建筑图像形状特征,利用该特征来对其进行标定。实验结果表明,所提方法能够适用于曝光度设置不理想的情况下采集的户外多障碍建筑图像,且对于不同布局类型的建筑图像均能获得较好的效果。
This article proposes a method of layout calibration of outdoor multi - barrier architectural image with low resolution based on bilinear interpolation. Firstly, the method acquired calibration board image with different an- gles or positions and confirmed intrinsic parameter of camera via feature points of calibration board and homographic matrix of corresponding outdoor multi - barrier architectural image, and then worked out external parameters of camera to improve the resolution of architectural image. The method carried out wavelet transform （WT） for outdoor multi - barrier architectural image and template image and extracted circle projection eigeuvector of layer - 2 WT of the template image to obtain candidate target of the image, moreover, the method carried out precise matching for the image with high resolution using image feature point and invariant moment. Finally, the method selected shape feature of architectural image with minimum Euclidean distance. Thus, using the feature, we carried out calibration for the image. Experiment simulation shows that the method is suitable for collecting outdoor multi - barrier architectural image under circumstance of non - ideal exposure setting. It can obtain preferable effect of architectural image with different types of layout.
作者
王睿
贺赛先
WANG Rui HE Sai - xian(Wuhan University School of Eleetronie Information, Wuhan Hubei 430072, Chin)
出处
《计算机仿真》
北大核心
2017年第6期236-240,共5页
Computer Simulation
关键词
低分辨率
户外
多障碍建筑图像
图像布局标定
Low resolution
Outdoor
Multi - barrier architectural image
Calibration of image layout
