Area and Speed Optimization of a $5ext{x}5$ Median Filter Design with 3-Direction Fast Searching Approach for Image Signal Processing Applications

摘要

In this paper, we propose 3-direction fast searching approach for a 5x5 median filter hardware architecture in the image signal processing applications. In algorithm, instead of typical serial compared schedule, this systematic approach utilizes grouping comparison in parallel to extremely shrink total comparison time. In hardware realization, it can provide an areaoptimized and speed-optimized design architecture compared to other types of median-value searching methods. By using TSMC 40-nm CMOS technology, a design implementation of developed 5x5 median filter with a wordlength of 8 bits is synthesized, only occupying a design area of 0.0099 mm^{2and operating up to 250 MHz.}