排序方式: 共有11条查询结果,搜索用时 15 毫秒
1.
A universal approach to camera calibration based on features of some representative lines on traffic ground is presented. It uses only a set of three parallel edges with known intervals and one of their intersected lines with known slope to gain the focal length and orientation parameters of a camera. A set of equations that computes related camera parameters has been derived from geometric properties of the calibration pattern. With accurate analytical implementation, precision of the approach is only decided by accuracy of the calibration target selecting. Final experimental results have showed its validity by a snapshot from real automatic visual traffic surveillance (AVTS) scenes. 相似文献
2.
3.
4.
Urban road area recognition in ITS based on mean shift method 总被引:2,自引:0,他引:2
A color-based visual technique is described based on the mean shift image segmentation method providing relevant information for robust localization of the visible road area in Urban Intelligent Transportation System (U-ITS). The traffic image sequences are firstly trained to extract the background and then segmented into separated parts by the mean shift method as initialization, regions with the number of pixels not less than a threshold and with more uniform surfaces with the "same" color compared to their environment are filtered as recognized road area. The algorithm given in this paper can present road area recognition with arbitrary shapes, which is fit for unstructured road applications in urban cities very well. 相似文献
5.
6.
7.
利用前期搭建的声分辨光声系统对小鼠耳朵进行扫描成像,获取的光声图像存在部分血管不连续、分辨率较低且边界不够清晰等问题。为了有效提高声分辨光声图像质量,采用连接断点、插值、小波去噪等方法进行预处理;针对插值带来的模糊边界、损失细节等问题提出一种模糊集与分数阶微分小波增强相结合的图像增强方法,设计对比实验,结合信息熵、对比度改善指数和平均梯度等评价指标进行评价。实验结果表明增强后的图像血管连接性好、分辨率更高、高频信息表现更丰富,所提增强方法对光声图像的优化处理有应用潜力。 相似文献
8.
在考察多种二值图像连通区域标记方法的基础上,提出了一种新的基于图像填充和游程码的二值图像孔洞连通域的标记和表达方法。对二值图像进行一次扫描,得到所有可能构成孔洞的游程码,并将游程对应的区域基于特定标记值进行填充。通过判断每个游程与图像上一行像素点标记值的对应关系完成新连通域的建立、游程数据存储和连通区域的合并,判断每个游程与图像下一行像素点标记值的对应关系完成孔洞的筛选。由于仅需扫描图像一次,且对每个游程只须进行单独处理,标记算法的效率较高、复杂度较低。结果表明,可以快速有效地完成二值图像孔洞连通域的标记。同时,它还给出孔洞之间的包含关系,能够有效地实现二值图像的拓扑结构表达。 相似文献
10.
激光线扫方式获取的点云数据量庞大,不利于点云数据的存储、处理与分析。为了对激光线扫点云数据进行有效精简,提出了一种基于OTSU多阈值分割算法的激光线扫点云数据表达及精简方法。基于点云数据坐标与图像灰度值的映射,采用OTSU多阈值分割算法进行区域分割,并将分割后的各区域进行边缘提取及细化处理。根据原映射关系将细化的二值图像重新以点云方式表示,即得到精简的点云数据。在保持原有点云数据关键信息完整度的基础上,可有效地精简点云数据。实验结果表明:基于OTSU多阈值分割算法可有效地精简点云数据,同时能够有效地去除扫描过程中的背景干扰数据,具有较大的适用性和实际应用参考价值。 相似文献