摘要
大视角鱼眼镜头得到了越来越广泛的应用,为很好校正大视角鱼眼畸变图像,本研究改进了确定图像中心及半径的逐行逐列扫描法,通过阈值判断舍弃边缘不可靠点,弥补了此方法在边缘处黑色像素较多时误差较大的缺点,可更精确确定鱼眼图像中心;采用球面透视投影约束将畸变像素点映射为单位球面点;然后以球心为投影中心,将球面点透视投影到球外切的正方体面上,通过适当放大得到的正方体面像素点坐标来匹配像素点位置,最后对图像进行双线性插值得到最终的校正结果。
Large angle fish eye lens are applied in more and more fields.To correct the large-angle fish eye images better,we improve the method that confirms the center and radial of the fisheye images by scanning row by row and column by column,which avoids producing errors when there are many black pixels on the edge of the fish eye images and make the determination of the image center and radial more accurate by threshold judgement which can remove the unreliable edge pixels.Then,we use the algorithm of spherical perspective projection constraint that maps the distorted planar points to the spherical points.After getting the spherical points,these spherical points are mapped to the faces of the cube which circumscribes the sphere.By amplifying the pixels coordinate values of the cube faces properly and using bilinear interpolation on the cube faces,the corrected images are finally achieved.
出处
《河北农业大学学报》
CAS
CSCD
北大核心
2014年第3期106-110,共5页
Journal of Hebei Agricultural University
关键词
大视角鱼眼镜头
鱼眼图像校正
图像中心
球面透视投影约束
中心透视投影
large angle fish eye
fish eye image correction
image center
spherical perspective projection constraint
central perspective projection
