基于B样条插值算法的亚像元技术的研究

Research on subpixel dynamic imaging technique based on B-spline curve

亚像元动态成像技术是目前实现卫星相机小型化及提高相机空间分辨率的一种有效方法。在不改变TDICCD相机的焦距、成像距离,以及TDI CCD器件的像元尺寸的前提下,亚像元动态成像技术可以提高相机的空间分辨率。利用B样条插值算法,研究了TDI CCD相机的图像的亚像元动态插值问题,由两幅相机输出的原始图像经过算法得到比原图像分辨率高的图像,并对比了该算法与其它几种算法的效果,分析结果表明,该算法较其它算法得到的高分辨率图像的效果更佳。

The subpixel dynamic imaging technique is one of the valid new methods, which can reduce the size of camera used in satellites and improve its spatial resolution. The technique can improve imaging system＇s resolution, while keeping the same size of TDI CCD sensor, the focal length and the imaging length of the camera system. Based on the interpolation algorithm of B-spline curve, the high-resolution image was obtained from the two images of two TDI CCD cameras constituted using the subpixel dynamic imaging technique. The simulation results showed that it has more effective compared to other subpixel dynamic imaging methods.