CBERS-1红外遥感器MTF在实验室条件下与遥感图像质量评价参数的相关建模研究

【作者】 汪静；

【导师】 朱近；

【作者基本信息】 南京理工大学 ， 计算机软件与理论， 2004， 硕士

【摘要】 MTF(Module Transfer Function)调制传递函数，在物理光学理论中，是光学系统成像性能的评价指标。MTF的高低直接关系到遥感器研制过程的成本高低和成像质量的好坏。另一方面，随着卫星遥感器在轨运行时间的增长，其性能会逐渐退化，MTF也会逐渐下降。所以，对于整个遥感器的主要物理参数MTF退化特性的监测，遥感器研制单位、遥感应用部门均非常关注。目前，研究集中在如何从卫星遥感图像上直接测量MTF，但该方法还有许多难点，使这一技术成为完全成熟的技术还有许多工作需要去做。 由于地面接收的图像是遥感器成像的产物，所以从理论上看，在轨运行的MTF的性能变化就应该能从地面获得的遥感图像了解到，描述遥感图像的质量评价参数则反映了遥感图像质量的变化。因此，本文提出另外一种设想，即建立MTF与遥感图像质量评价参数的关系模型，通过遥感图像质量评价参数的变化来反演遥感器MTF的变化。 本文以CBERS-1的02星红外遥感器为例，在实验室条件下模拟遥感器在轨运行的成像过程并获得图像数据，从若干遥感图像质量评价参数中选择合适的图像参数，建立实验室条件下光学系统指标MTF和图像的质量评价参数的数学关系模型，并对这些模型进行了验证和分析。 本文主要完成实验室条件下的建模研究过程，把实验室中建立的关系模型移到外景环境下还需要进行修正，校验与调试，这也是今后所要继续研究的方向。 总之，本项研究是一项具有新意的研究工作，既关系到遥感器在轨运行监测的应用前途，也关系到后继资源卫星遥感器的MTF的设计，具有基础研究的价值。更多还原

【Abstract】 MTF (Module Transfer Function), in the physical optics theory, is a evaluating index of imaging performance of optics system, which has close relation to the manufacture cost of the remote sensor and the quality of imaging. On the other hand, when the remote sensor runs on orbit, its performance will gradually degenerate and MTF will gradually descend too. So the manufacture units and application departments of the remote sensing image pay great attention to degeneration inspecting of MTF. At present, research focus on how to measure MTF directly from the remote sensing image. But this method has much difficulty and there are many work to do to make this method mature.Because the remote sensing image is the outcome of imaging of remote sensor, in theory, the change of MTF can be known from the remote sensing image, and the quality evaluation parameters reflect the change of quality of the remote sensing image. So we bring forward an assumption that we can build up a function model between MTF and image quality evaluation parameters, through which we calculate the change of MTF.We take example for the infrared remote sensor of the second satellite of CBERS-1, simulate the change of MTF in the laboratory, obtain the target images with the corresponding MTF, select appropriate parameters, set up the function model between optical system evaluation index MTF and image quality evaluation parameters in the laboratory, and the validation and analysis are given.We mainly finish the modeling in the laboratory, If we want to apply the model to calculate the actual MTF directly, the model must be gone on correcting, which is a research aspect later.In a word, this research is a work with new idea and basic research value, which has great relation to the foreground of measure running on orbit of the remote sensor, and to design of next satellite.更多还原