監控攝像機逆光問題如何去解決?
在網點出(chu)(chu)入口安(an)裝(zhuang)(zhuang)攝(she)像(xiang)機,遇到(dao)最大的問題是由于攝(she)像(xiang)機安(an)裝(zhuang)(zhuang)位置(zhi)不當,監(jian)視畫面上會出(chu)(chu)現(xian)(xian)逆光(guang)現(xian)(xian)象,對此,筆者認為,可(ke)以采用(yong)三種辦法加以改(gai)善:一是在安(an)裝(zhuang)(zhuang)位置(zhi)上盡量避免陽光(guang)直射(she);二(er)是選用(yong)具有相(xiang)應改(gai)善功能的攝(she)像(xiang)機;三是通過提高(gao)室內光(guang)源(yuan)照(zhao)度,減小與室外光(guang)線(xian)的反差。
(1) 通過(guo)(guo)調整安(an)(an)裝(zhuang)位置(zhi),改善逆(ni)光(guang)(guang)(guang)現(xian)(xian)象(xiang)通過(guo)(guo)調整出(chu)(chu)(chu)(chu)入(ru)(ru)(ru)(ru)口(kou)攝(she)(she)像(xiang)(xiang)(xiang)機(ji)的(de)(de)(de)(de)安(an)(an)裝(zhuang)位置(zhi),盡量避開來自外界的(de)(de)(de)(de)陽光(guang)(guang)(guang)直射,能在(zai)很大(da)程度上(shang)(shang)改善出(chu)(chu)(chu)(chu)入(ru)(ru)(ru)(ru)口(kou)的(de)(de)(de)(de)逆(ni)光(guang)(guang)(guang)現(xian)(xian)象(xiang),如上(shang)(shang)海某賓館在(zai)大(da)廳出(chu)(chu)(chu)(chu)入(ru)(ru)(ru)(ru)口(kou)二側分(fen)別(bie)安(an)(an)裝(zhuang)了(le)一臺攝(she)(she)像(xiang)(xiang)(xiang)機(ji),監視出(chu)(chu)(chu)(chu)入(ru)(ru)(ru)(ru)人員;工行(xing)(xing)上(shang)(shang)海分(fen)行(xing)(xing)將(jiang)監視出(chu)(chu)(chu)(chu)入(ru)(ru)(ru)(ru)口(kou)的(de)(de)(de)(de)攝(she)(she)像(xiang)(xiang)(xiang)機(ji)倒裝(zhuang),使攝(she)(she)像(xiang)(xiang)(xiang)機(ji)的(de)(de)(de)(de)鏡頭對著(zhu)(zhu)走出(chu)(chu)(chu)(chu)網(wang)點的(de)(de)(de)(de)人員(在(zai)出(chu)(chu)(chu)(chu)現(xian)(xian)逆(ni)光(guang)(guang)(guang)現(xian)(xian)象(xiang)比較(jiao)嚴重的(de)(de)(de)(de)情況下這(zhe)樣安(an)(an)裝(zhuang)方(fang)法比將(jiang)攝(she)(she)像(xiang)(xiang)(xiang)機(ji)對著(zhu)(zhu)出(chu)(chu)(chu)(chu)入(ru)(ru)(ru)(ru)口(kou)安(an)(an)裝(zhuang),效(xiao)果要(yao)好(hao),但要(yao)引起注意的(de)(de)(de)(de)是(shi),如果采(cai)用上(shang)(shang)述倒裝(zhuang)方(fang)法,對于(yu)一個(ge)(ge)網(wang)點上(shang)(shang)有2個(ge)(ge)以上(shang)(shang)出(chu)(chu)(chu)(chu)入(ru)(ru)(ru)(ru)口(kou)的(de)(de)(de)(de),攝(she)(she)像(xiang)(xiang)(xiang)機(ji)的(de)(de)(de)(de)安(an)(an)裝(zhuang)方(fang)向(xiang)都應該(gai)一致,不(bu)(bu)然(ran)會出(chu)(chu)(chu)(chu)現(xian)(xian)防范漏洞)。它們(men)都能較(jiao)好(hao)的(de)(de)(de)(de)解決(jue)逆(ni)光(guang)(guang)(guang)問題。現(xian)(xian)在(zai)有許(xu)多(duo)網(wang)點,營業(ye)廳的(de)(de)(de)(de)面積都不(bu)(bu)大(da),有的(de)(de)(de)(de)進了(le)出(chu)(chu)(chu)(chu)入(ru)(ru)(ru)(ru)口(kou)就(jiu)(jiu)是(shi)現(xian)(xian)金(jin)柜(ju)臺區,可提供給安(an)(an)裝(zhuang)攝(she)(she)像(xiang)(xiang)(xiang)機(ji)的(de)(de)(de)(de)位置(zhi)并(bing)不(bu)(bu)多(duo),這(zhe)樣,就(jiu)(jiu)更(geng)需(xu)要(yao)我(wo)們(men)注意解決(jue)好(hao)安(an)(an)裝(zhuang)位置(zhi)問題,盡量避免將(jiang)攝(she)(she)像(xiang)(xiang)(xiang)機(ji)對著(zhu)(zhu)出(chu)(chu)(chu)(chu)入(ru)(ru)(ru)(ru)口(kou)安(an)(an)裝(zhuang),我(wo)們(men)講出(chu)(chu)(chu)(chu)入(ru)(ru)(ru)(ru)口(kou)要(yao)安(an)(an)裝(zhuang)攝(she)(she)像(xiang)(xiang)(xiang)機(ji),并(bing)沒有規定監視出(chu)(chu)(chu)(chu)入(ru)(ru)(ru)(ru)口(kou)的(de)(de)(de)(de)攝(she)(she)像(xiang)(xiang)(xiang)必須(xu)安(an)(an)裝(zhuang)在(zai)哪一個(ge)(ge)位置(zhi)上(shang)(shang),應該(gai)講重要(yao)的(de)(de)(de)(de)是(shi)看(kan)效(xiao)果,看(kan)實物質(zhi)量。
(2) 通(tong)過選用(yong)(yong)(yong)具有相應功(gong)(gong)(gong)能(neng)的(de)(de)(de)(de)(de)攝(she)(she)像機(ji)(ji),改善逆光(guang)現(xian)(xian)(xian)象(xiang) 選用(yong)(yong)(yong)超(chao)動態攝(she)(she)像機(ji)(ji)或者有背(bei)(bei)(bei)景補(bu)償(chang)功(gong)(gong)(gong)能(neng)的(de)(de)(de)(de)(de)攝(she)(she)像機(ji)(ji)也(ye)是(shi)(shi)改善出(chu)(chu)(chu)(chu)(chu)入(ru)口(kou)逆光(guang)現(xian)(xian)(xian)象(xiang)的(de)(de)(de)(de)(de)一(yi)種方法(fa)。一(yi)般攝(she)(she)像機(ji)(ji)都(dou)有AGC(自(zi)動增益控制)功(gong)(gong)(gong)能(neng),即有強弱信(xin)(xin)號自(zi)動提高(gao)(gao)攝(she)(she)像機(ji)(ji)內(nei)部的(de)(de)(de)(de)(de)放大增益,將強信(xin)(xin)號自(zi)動降低攝(she)(she)像機(ji)(ji)內(nei)部放大器增益,使最終的(de)(de)(de)(de)(de)輸(shu)(shu)出(chu)(chu)(chu)(chu)(chu)信(xin)(xin)號基(ji)(ji)本不(bu)隨(sui)輸(shu)(shu)入(ru)信(xin)(xin)號的(de)(de)(de)(de)(de)變(bian)化(hua)而變(bian)化(hua),輸(shu)(shu)出(chu)(chu)(chu)(chu)(chu)信(xin)(xin)號幅值基(ji)(ji)本維(wei)持不(bu)變(bian)的(de)(de)(de)(de)(de)功(gong)(gong)(gong)能(neng),但(dan)是(shi)(shi)一(yi)般攝(she)(she)像機(ji)(ji)的(de)(de)(de)(de)(de)這種自(zi)動調節(jie)功(gong)(gong)(gong)能(neng)是(shi)(shi)有限的(de)(de)(de)(de)(de),一(yi)旦出(chu)(chu)(chu)(chu)(chu)現(xian)(xian)(xian)很(hen)強的(de)(de)(de)(de)(de)信(xin)(xin)號(如強烈的(de)(de)(de)(de)(de)逆光(guang)的(de)(de)(de)(de)(de)現(xian)(xian)(xian)象(xiang))超(chao)過了一(yi)般攝(she)(she)像機(ji)(ji)自(zi)動調節(jie)范(fan)(fan)圍,放大器就飽和,就起(qi)不(bu)到(dao)自(zi)動調節(jie)作(zuo)用(yong)(yong)(yong),監視器畫(hua)面(mian)上就會出(chu)(chu)(chu)(chu)(chu)現(xian)(xian)(xian)一(yi)片(pian)邊緣模糊的(de)(de)(de)(de)(de)白(bai)斑(逆光(guang)現(xian)(xian)(xian)象(xiang))。而超(chao)動態攝(she)(she)像機(ji)(ji)自(zi)動調節(jie)的(de)(de)(de)(de)(de)范(fan)(fan)圍比(bi)(bi)一(yi)般攝(she)(she)像機(ji)(ji)要(yao)大。我們可(ke)以(yi)通(tong)過實踐感覺到(dao),當(dang)現(xian)(xian)(xian)場中出(chu)(chu)(chu)(chu)(chu)現(xian)(xian)(xian)畫(hua)面(mian)層次比(bi)(bi)較(jiao)豐富的(de)(de)(de)(de)(de)目(mu)(mu)標(biao)物體(ti)時,用(yong)(yong)(yong)普通(tong)攝(she)(she)像機(ji)(ji)攝(she)(she)取目(mu)(mu)標(biao)物體(ti)時,所獲得的(de)(de)(de)(de)(de)畫(hua)面(mian)層次較(jiao)多,所以(yi)選用(yong)(yong)(yong)超(chao)動態攝(she)(she)像對畫(hua)面(mian)反差(cha)比(bi)(bi)較(jiao)大的(de)(de)(de)(de)(de)逆光(guang)問(wen)題,也(ye)能(neng)起(qi)到(dao)一(yi)定(ding)(ding)的(de)(de)(de)(de)(de)改善的(de)(de)(de)(de)(de)作(zuo)用(yong)(yong)(yong)。 出(chu)(chu)(chu)(chu)(chu)入(ru)口(kou)出(chu)(chu)(chu)(chu)(chu)現(xian)(xian)(xian)的(de)(de)(de)(de)(de)逆光(guang)現(xian)(xian)(xian)象(xiang),往往是(shi)(shi)現(xian)(xian)(xian)場中出(chu)(chu)(chu)(chu)(chu)現(xian)(xian)(xian)一(yi)個很(hen)亮的(de)(de)(de)(de)(de)背(bei)(bei)(bei)景和一(yi)個很(hen)暗的(de)(de)(de)(de)(de)前景目(mu)(mu)標(biao),而且(qie)背(bei)(bei)(bei)景和目(mu)(mu)標(biao)的(de)(de)(de)(de)(de)位置(zhi)基(ji)(ji)本維(wei)持不(bu)變(bian),選用(yong)(yong)(yong)具有BLC功(gong)(gong)(gong)能(neng)(背(bei)(bei)(bei)景光(guang)補(bu)償(chang)功(gong)(gong)(gong)能(neng))的(de)(de)(de)(de)(de)攝(she)(she)像機(ji)(ji),可(ke)僅對現(xian)(xian)(xian)場某個區域求(qiu)平均值來(lai)確(que)定(ding)(ding)AGC工作(zuo)點,此(ci)時如果前景目(mu)(mu)標(biao)位于該區域時,則前景目(mu)(mu)標(biao)的(de)(de)(de)(de)(de)清晰度可(ke)望提高(gao)(gao)。
(3) 通(tong)(tong)過提高室(shi)內(nei)(nei)光(guang)(guang)(guang)源(yuan)照(zhao)度(du),改(gai)善(shan)(shan)逆(ni)(ni)光(guang)(guang)(guang)現(xian)(xian)(xian)(xian)(xian)象(xiang); 通(tong)(tong)過提高室(shi)內(nei)(nei)光(guang)(guang)(guang)源(yuan)的(de)照(zhao)度(du)也是改(gai)善(shan)(shan)逆(ni)(ni)光(guang)(guang)(guang)現(xian)(xian)(xian)(xian)(xian)象(xiang)的(de)一條途(tu)徑,圖像出現(xian)(xian)(xian)(xian)(xian)逆(ni)(ni)光(guang)(guang)(guang)現(xian)(xian)(xian)(xian)(xian)象(xiang),主(zhu)要是視場(chang)范(fan)圍光(guang)(guang)(guang)線照(zhao)度(du)強(qiang)(qiang)(qiang)弱(ruo)反差太(tai)(tai)大引起(qi)的(de)。安(an)裝于(yu)出入口的(de)攝像機(ji),其(qi)(qi)監控(kong)范(fan)圍內(nei)(nei)的(de)室(shi)外光(guang)(guang)(guang)線強(qiang)(qiang)(qiang),室(shi)內(nei)(nei)光(guang)(guang)(guang)線弱(ruo),就形成(cheng)了圖像黑(hei)白層(ceng)次(ci)反差太(tai)(tai)強(qiang)(qiang)(qiang)。這(zhe)樣,如果通(tong)(tong)過提高室(shi)內(nei)(nei)光(guang)(guang)(guang)源(yuan)的(de)照(zhao)度(du),使室(shi)內(nei)(nei)光(guang)(guang)(guang)線增強(qiang)(qiang)(qiang)。減小與外界光(guang)(guang)(guang)亮的(de)反差,也可以改(gai)善(shan)(shan)逆(ni)(ni)光(guang)(guang)(guang)現(xian)(xian)(xian)(xian)(xian)象(xiang)。; 改(gai)善(shan)(shan)或者減少出入口的(de)逆(ni)(ni)光(guang)(guang)(guang)現(xian)(xian)(xian)(xian)(xian)象(xiang),還有(you)一些其(qi)(qi)它輔助辦法,如在(zai)地面鋪設一些地毯,防止地面光(guang)(guang)(guang)的(de)反射,在(zai)*近出入口附近的(de)窗(chuang)戶(hu),用窗(chuang)簾遮擋陽光(guang)(guang)(guang)的(de)直射等,都是輔助改(gai)善(shan)(shan)逆(ni)(ni)光(guang)(guang)(guang)現(xian)(xian)(xian)(xian)(xian)象(xiang)的(de)方法。 出入口的(de)逆(ni)(ni)光(guang)(guang)(guang)現(xian)(xian)(xian)(xian)(xian)象(xiang)是一個比較突(tu)出的(de)問(wen)題(ti),而且(qie)這(zhe)個問(wen)題(ti)的(de)解決(jue),目前(qian)還沒有(you)找到一種(zhong)(zhong)最徹(che)底,最有(you)效的(de)辦法,以上介紹(shao)的(de)三(san)種(zhong)(zhong)辦法,對改(gai)善(shan)(shan)逆(ni)(ni)光(guang)(guang)(guang)現(xian)(xian)(xian)(xian)(xian)象(xiang)都有(you)一定作用,需(xu)要將其(qi)(qi)綜(zong)合起(qi)來應用。
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