测井图像的多级中值滤波算法及其FPGA实现

摘要

In order to reflect the reality of the information of stratum, the data which is acquired by Micro Resistivity Imager need filtering, and median filtering is commonly used in image preprocessing. So this paper has introduced the principle of the standard median filtering and multi-level median filtering. By analyzing the characteristics of the rhombic window and its applicable conditions, this paper has designed and realized FPGA-based rhombic filter window and functional simulation. Comparing the FPGA resource consumption of hardware structure of the two filtering windows, it is has been turned out that this rhombic window has a strong practical effect on elimination of stratigraphical noise.%微电阻率成像测井仪传输上来的地层信息数据需要滤波处理后才能真实地反映出地层中油层的信息,而中值滤波是图像预处理中常用的技术. 本文介绍了标准中值滤波和多级中值滤波的原理,分析了菱形窗口的特点以及适用条件,设计并实现了基于FPGA的菱形滤波窗口及其功能仿真,并对两种滤波窗口的硬件结构进行FPGA资源消耗的对比,说明文中设计的菱形滤波器对消除地层噪声干扰有很强的实用性.