移轴组合相机拼接模型及自检校技术研究

Image stitching model of axis-shift multi digital camera and its self-calibration

研究了非量测型移轴组合相机的图像拼接技术,以双拼移轴相机为研究对象,探讨了其虚拟像空间坐标系建立,并以此为基础建立子影像至虚拟影像的变换模型。提出一种基于初值约束的投影矩阵自检校方法,该方法利用移轴相机检校参数,结合子影像变换模型,推导和计算自检校方程,精确解求虚拟影像拼接参数。设计了室内外地面实验以及航飞实验,对提出的方法进行了验证。实验结果表明,利用该方法进行移轴组合相机虚拟影像拼接,精度优于0.4像素。

The stitching method on the axis-shift multi-camera is discussed.The dual-combined axis-shift camera is researched and the virtual image plane of axis-shift image is established.The transformation matrix of sub-image to the virtual image plane is calculated.A dynamic self-calibration algorithm is proposed based on the initial value constraint.The self-calibration equation is deduced and calculated.When the stitching parameters are accurately calculated,the virtual image is mosaicked.The ground and aerial experiments are designed to validate the model proposed.The experiments results indicate that the accuracy of stitching method is better than 0.4 pixels.