在壓電陶瓷驅(qū)動(dòng)下, CMO S 圖像傳感器在焦平面內(nèi)每幀位移一個(gè)象素以獲取一個(gè)幀與幀之間存在位移的周期性圖像序列, 通過(guò)電子反向位移對(duì)準(zhǔn), 將一個(gè)周期內(nèi)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(shù)字式CMO S 圖像傳感器進(jìn)行多幀微掃描成像試驗(yàn). 試驗(yàn)結(jié)果證明, 多幀微掃描所得圖像與無(wú)微掃描的單幀圖像相比FPN 已經(jīng)完全消除.
關(guān)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