摘要
经折反射全景成像系统采集的全景图像有严重的像素重复、丢失问题,需展开成符合人眼观察的矩形图像。针对同心圆环近似展开法的坐标映射不是一一对应的问题,提出一种改进的Bresenham直线径向扫描展开方法,为保证每列的径向展开像素个数相同,在径向扫描的拉伸过程中通过误差补偿的双线性插值算法还原丢失像素,改善双线性插值法插值位置仅受相邻四点的相关性约束的缺陷。实验结果表明:该方法展开的图像提高了图像的边缘细节,相比传统双线性插值法的图像信息熵提高6%,平均梯度提高2%左右。该方法可以有效应用于圆柱状物体内部质量的优劣及使用寿命的检查。
The panoramic image acquired by the catadioptric omnidirectional imaging system has serious pixel repetition and loss problems and needs to be unwrapped into a cylindrical image suitable for human eye observation.In order to solve the problem that the coordinate mapping of the concentric ring approximation expansion method is not one-to-one correspondence,an improved Bresenham linear radial scan expansion method is proposed to ensure the same number of pixels in radial expansion of each column.In the stretching process of radial scanning,a bilinear interpolation algorithm with error compensation is used to restore lost pixels and improve the defect that the interpolation position of bilinear interpolation is only constrained by the correlation of adjacent four points.The experimental results show that the image developed by this method improves the edge detail of the image.Compared with the traditional bilinear interpolation method,the image entropy is increased by 6%and the average gradient is increased by about 2%.The method can be effectively applied to the quality of the internal quality of the cylindrical object and the inspection of the service life.
作者
高雪峰
景文博
李世涛
钱思羽
李梦迪
GAO Xue-feng;JING Wen-bo;LI Shi-tao;QIAN Si-yu;LI Meng-di(School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022;Northern Huguang Photoelectrics Co,Wuxi 214035)
出处
《长春理工大学学报（自然科学版）》
2020年第1期27-31,共5页
Journal of Changchun University of Science and Technology(Natural Science Edition)
基金
国家科技部项目(2018YFB1107600)。
关键词
全景图像
径向展开
误差补偿
双线性插值
panoramic image
radial expansion
error compensation
bilinear interpolation
