摘要
以高精度DEM和正视IKONOS全色影像为基础数据,忽略IKONOS和目标相机在轨成像时入瞳辐亮度的差异,简化卫星飞行轨迹的计算,用不同频率、振幅的正弦曲线叠加生成卫星姿态角,用像元细分和积分过程离散化方法获取CCD在多级动态积分过程中接收的平均辐亮度,根据辐亮度与DN值的转换参数仿真相机的模数转换过程。根据基础影像和目标影像的MTF对应关系在频率域进行MTF退化,根据目标影像信噪比参数对影像加入噪声,然后对影像进行不同倍率的JPEG2000压缩。
High resolution DEM and Nadir-mode Panchromatic IKONOS image are used as basic data,and difference of radiant luminance at incident pupil between IKONOS and target camera is ignored.Satellite track computation is simplized.Attitude angles are created by adding up sinusoid of different frequency and swing.We acquire detected luminance of CCD while imaging dynamically by dispersing CCD focal plane and integral time.We simulate the A/D conversion process according to conversion parameters between luminance and digital number.We simulate the MTF degradation process in frequency field according to corresponding relation between MTF of basic image and target image.Then we append noise to image according to signal-noise ratio.In the end,we compress the image by JPEG2000 in different ratio.According to imaging principle of TDI CCD camera,we regulate part or all parameters according to need,create simulant images timely.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2010年第12期1427-1431,共5页
Geomatics and Information Science of Wuhan University
基金
地理空间信息工程国家测绘局重点实验室基金资助项目(200704)
