摘要
全景环形透镜(PAL)组成的观测系统能够同时观测到绕光轴360°的物体,适合于管道等的内窥。但是所形成的环形图像不便于人眼观察和测量,为此需要将环形图像无失真地展开为常规平面像。根据PAL成像的特点,以全景图像的最高分辨率为基准,采用一种基于边缘检测和最优参数的插值方法,对孤立边缘和联通域内的部分采用最优参数的三次卷积插值法,非边缘区域采用双线性插值,结果表明,该方法较好地恢复了图像细节,同时插值处理时间相比三次卷积插值缩短了40%。
The observing system made up of PAL can observe objects around the lens,so it fits for the detection of the feature of the pipeline wall.But the annular image formed by PAL is not only unconvenient for observation and measurement,thus an annular image from PAL needs to be unwrapped to conventional rectangular image without distortion.The PAL image is restored according to the imaging feature of panoramic annular lens,referenced to the highest resolution,adopt an interpolation method.Based on edge detection and optimal parameter which adopts cubic convolution interpolation for the isolated edge and connected space,while adopting bilinear interpolation for non-edge,it shows that this method can restore the detai of the image preferably,meanwhile the time consumed is shortened by 40% in comparison with cubic convolution interpolation.
出处
《科学技术与工程》
2011年第9期1977-1980,共4页
Science Technology and Engineering
基金
军队科研[2009]246资助
关键词
全景环形透镜
坐标变换
边缘检测
三次卷积插值
PAL coordinate transformation edge detection cubic convolution interpolation
