为了解决景象匹配系统中引入对数极坐标变换后实时性降低的问题,文中采用FPGA查找表的方法,以QuartusII作为综合仿真平台,运用Verilog描述语言,结合Matlab工具,实现了把64×64像素的灰度图像转换成50×80像素的对数极坐标图的过程,变换时间小于100µs。该方法可以作为DSP景象匹配系统的预处理前端,实现对旋转和缩放图像的实时匹配。

In order to decrease the run time of scene matching system in which the log-polar transformation was employed, the implementation of the LPT for image by FPGA was designed in this paper. Through using the software tools of Quartus II and Matlab, and the language of Verilog, a 64×64 gray image can be transformed to a 50×80 LPT image by FPGA in less than 100us. This design can be treated as a pre-processing front-end of DSP scene matching system when the reference image is matched by a real-time image with rotation and scale changing.