Unconventional Sampling And Its Image Restoration

With the development of spaceflight technology, the demands of image resolution are also increasing. To improve resolution, all the spaceflight countries attach importance to the researches of remote sensor imaging system, including hardware methods, software methods, combination of hardware and software methods. The regular sampling method to improve resolution, such as minishing the CCD measurement, augmenting the focus of cameras, taking from the orbit height of satellites, which could improve the resolution of imaging system in a certain extent, however, minishing the CCD measurement is restricted by hardware manufacture, augmenting the focus of cameras is restricted by volume and weight of satellites, taking from the orbit height of satellites is restricted by the life of satellites.This article introduces virtues of CCD cameras, and discusses parameters of sampling, sampling density, aliasing, which are concerned with imaging modes and imaging quality.After researching on how to improve resolution in regular sampling methods, this article makes researches on irregular sampling modes, such as supermode sampling, hipemode sampling and microscanning. We analyze the theory of their samplings, and make a brief introduction of SPOT-5 satellite which uses supermode sampling.This article mainly researches on imaging sampling experimentations, image reconstruction and image restoration of two new irregular sampling modes-decelerating in the level sampling and 45 degree slanting mode sampling. They need no modifies on hardware, but need to change shifting rate or scanning angle of CCD array. This article designs the experimentation modes of the two new sampling, and draws a conclusion that decelerating 1/2 in the level sampling can improve level resolution to 2 times, 45 degree slanting mode sampling can improve whole image resolution to 1.19 times, if uses the new two methods synchronously, it can improve whole resolution to 1.682 times in theory.To test the new sampling modes synthetically, the researching work of this article incarnates that we make use of regular sampling modes, decelerating in the level sampling and 45 degree slanting mode sampling to sample lab drones and exterior, in the design of software, after comparing neighborhood filter and medium value filter, we adopt medium value filter to avoid noise, which improve image quality. Then we research on image reconstruction and image restoration of the two...