在壓電陶瓷驅動下, CMO S 圖像傳感器在焦平面內每幀位移一個象素以獲取一個幀與幀之間存在位移的周期性圖像序列, 通過電子反向位移對準, 將一個周期內的圖像幀疊加以消除固定圖案噪聲(fixed pat tern no ise, FPN ). 選用SV GA 的數字式CMO S 圖像傳感器進行多幀微掃描成像試驗. 試驗結果證明, 多幀微掃描所得圖像與無微掃描的單幀圖像相比FPN 已經完全消除.
關鍵詞: 信噪比; 微掃描; CMO S 圖像傳感器; 固定圖案噪聲; 多幀平滑
Abstract: A ctuated by PZT , the CMO S im age sen so r is sh if ted one p ixel in focal p lane every f ram e and a periodic im age sequence w ith disp lacem em n t s betw een f ram es is ach ieved. A ligned by elect ron ically re2 versed sh if t ing, the sequen t ial f ram es w ith in a period can be added and the FPN cancelled ou t. A SV GA digital CMO S im age sen so r is u sed fo r experim en t s of m u lt i2f ram e m icro scann ing im aging. Compared w ith single f ram e im age, the experim en tal resu lt s show ed that the im age derived f rom m u lt i2f ram e m icro scan2 n ing im aging is f ree of FPN.
Key words: signal to no ise rat io; m icro scann ing; CMO S im age sen so r; FPN; m u lt i2f ram e2smoo thz