拼接型航测相机影像仿真方法研究

Research on Image Simulation Method of Stitched Aerophotogrammetry Camera

幅宽是航空测绘相机的重要技术指标,视场拼接是航测相机获得大幅宽的有效技术手段。拼接型测绘相机在生产前按相机参数进行航空影像的仿真,预估对测绘成图的影响,对评价测绘相机设计参数的合理性十分必要。为模拟拼接型航测相机宽幅遥感影像,从航空摄影测量基础入手,提出了一种三相机外视场拼接型航测相机的影像仿真方法,首先选取待仿真区域的DSM和DOM数据,并设置影像的内、外方位元素;其次依据共线方程和对应区域的DSM数据,计算影像上每一个像素点的像点坐标;最后在DOM上获取灰度值,并赋给影像像素。相比机载实际宽幅遥感影像,仿真图像具有真实模拟航摄参数影响,高分辨率、宽视场仿真等特点,仿真方法可为机载测绘相机的研制提供准确的数据支撑。

The width is an important technical index for aerophotogrammetry camera,and field of view stitching is an effective technical means for aerophotogrammetry cameras to obtain large widths.Before production,a stitched mapping camera performs aerial image simulation based on camera parameters to estimate the impact on mapping,which is essential for evaluating the rationality of the design parameters of the mapping camera.In order to simulate the wide-range remote sensing image of a mosaic aerial camera,we proposed animage simulation method for a three-camera external field of view mosaic aerial camera by starting with the fundamentals of aerophotogrammetry.Firstly,we selected DSM and DOM data of area to be simulated and set the internal and external orientation elements of image.Then,we calculated the image coordinates of each pixel on the image based on the collinear equation and the DSM data of corresponding region.Finally,we obtained grayscale values on the DOM and assigned to image pixels.Compared to actual airborne wide-range remote sensing images,simulated images have the characteristics of truly simulating the effects of aerophotogrammetry parameters,high resolution and wide field of view simulation.Therefore,this simulation method can provide accurate data support for the development of aerophotogrammetry camera.