臺灣博碩士論文加值系統

如何改善匹配濾波器(Matched Spatial Filter,MSF)無法辨識旋轉物體
，輸出峰值不夠陡峭不易偵測，與不易製作等缺點，是本文研究的的目的
。我們以圓形諧波方程式(Circular Harmonic Function,CHF)濾波器為主
架構，用最低平均相關能量(Minimum Average Correlation Energy,
MACE)技術，改進CHF濾波器的缺點，以得陡峭的輸出峰值與以幾何中心為
展開中心(Center of Expansion,COE)。不過CHF與MACE結合的濾波器，其
方程式H(u,v)為複數型式，不易製作，因此，再利用(二進)只有相位(
(Binary)Phase-Only )處理方法，將H(u,v)簡化成只有相位成分(連續相
位或二進相位)，如此一來，用光空間調諧器(Spatial Light Modulator,
SLM)，便可以容易地製作此一濾波器。由電腦模擬的結果顯示，本濾波器
的設計，對於旋轉物體，具較佳的辨識能力，其陡峭的輸出峰值，亦較易
檢測。此外，經簡化後的H(u,v)型式也容易製作，MSF的缺點，亦由此得
以改善。

Traditional Matched Spatial Filter (MSF) can not recognize
rotated objects, filter output is not sharp and is difficult to
implement. Our objective here is to combine several tech-
niques to improve MSF performance. We use the Circular Harmonic
Function (CHF) filter as the main structure, then ultilize the
Minumum Average Correla- tion Engery (MACE) technique to
improve the performance of CHF filter, therefore the output
peak is sharp and the Center of Expansion is the geometric
center. But the transfer func- tion of the combination filter
of CHF and MACE is complex and thus hard to realize, so we use
again the (Binary) Phase-Only processing technique to simplify
its transfer function to become phase-only, which can easily
implemented by Spatial Light Modulator (SLM). The results of
computer simulation demonstrate that this filter has a better
discrimination to rotated objects, the output peak is sharp and
easily detected. In addition, the phase-only filter is also
easy to realize, so the drawbacks of MSF can be removed.