逆光安裝監控攝像機需要采用哪三種辦法改善?
在網(wang)點出入口安裝攝像(xiang)機,遇到最(zui)大的問題是由于攝像(xiang)機安裝位置不當,監視畫面上(shang)會(hui)出現(xian)逆光現(xian)象,對此(ci),個(ge)人認為(wei),可以采用(yong)三種(zhong)辦法(fa)加以改善:
一是在安裝位置上盡量避(bi)免(mian)陽光直射;二是選用具有相應改善功(gong)能的攝像機(ji);三是通過提高(gao)室內光源照度,減小與室外光線的反差(cha)。
(1)通過調(diao)整安(an)(an)裝位置(zhi)(zhi),改善(shan)逆(ni)光現(xian)(xian)象。通過調(diao)整出入(ru)(ru)口(kou)(kou)攝(she)(she)像(xiang)機的(de)(de)(de)安(an)(an)裝位置(zhi)(zhi),盡(jin)(jin)量(liang)避開來自(zi)外界的(de)(de)(de)陽光直射,能在(zai)很大(da)(da)程度(du)上改善(shan)出入(ru)(ru)口(kou)(kou)的(de)(de)(de)逆(ni)光現(xian)(xian)象,它們(men)都(dou)能較好的(de)(de)(de)解決逆(ni)光問題(ti)(ti)。現(xian)(xian)在(zai)有許多(duo)網點,營業廳(ting)的(de)(de)(de)面(mian)積都(dou)不(bu)大(da)(da),有的(de)(de)(de)進了出入(ru)(ru)口(kou)(kou)就(jiu)是(shi)(shi)現(xian)(xian)金柜臺(tai)區(qu),可(ke)提(ti)供給安(an)(an)裝攝(she)(she)像(xiang)機的(de)(de)(de)位置(zhi)(zhi)并不(bu)多(duo),這樣,就(jiu)更需要我(wo)們(men)注意解決好安(an)(an)裝位置(zhi)(zhi)問題(ti)(ti),盡(jin)(jin)量(liang)避免將攝(she)(she)像(xiang)機對著出入(ru)(ru)口(kou)(kou)安(an)(an)裝,我(wo)們(men)講出入(ru)(ru)口(kou)(kou)要安(an)(an)裝攝(she)(she)像(xiang)機,并沒有規(gui)定(ding)監視出入(ru)(ru)口(kou)(kou)的(de)(de)(de)攝(she)(she)像(xiang)必(bi)須安(an)(an)裝在(zai)哪一個(ge)位置(zhi)(zhi)上,應該講重要的(de)(de)(de)是(shi)(shi)看(kan)效果,看(kan)實物質量(liang)。
(2)通過(guo)選(xuan)用(yong)(yong)具(ju)有(you)(you)相應功(gong)(gong)能(neng)(neng)的(de)(de)(de)(de)(de)(de)(de)攝像機(ji),改(gai)(gai)善逆(ni)光(guang)現(xian)(xian)(xian)(xian)象(xiang)。選(xuan)用(yong)(yong)超動(dong)(dong)(dong)態攝像機(ji)或者有(you)(you)背(bei)景(jing)補(bu)償功(gong)(gong)能(neng)(neng)的(de)(de)(de)(de)(de)(de)(de)攝像機(ji)也(ye)是(shi)改(gai)(gai)善出(chu)(chu)(chu)(chu)入(ru)口(kou)逆(ni)光(guang)現(xian)(xian)(xian)(xian)象(xiang)的(de)(de)(de)(de)(de)(de)(de)一(yi)種方法。一(yi)般(ban)攝像機(ji)都有(you)(you)AGC(自(zi)(zi)動(dong)(dong)(dong)增(zeng)益控制)功(gong)(gong)能(neng)(neng),即有(you)(you)強弱信(xin)號自(zi)(zi)動(dong)(dong)(dong)提高攝像機(ji)內(nei)部的(de)(de)(de)(de)(de)(de)(de)放(fang)大(da)增(zeng)益, 將(jiang)強信(xin)號自(zi)(zi)動(dong)(dong)(dong)降(jiang)低攝像機(ji)內(nei)部放(fang)大(da)器(qi)(qi)增(zeng)益,使最終的(de)(de)(de)(de)(de)(de)(de)輸(shu)出(chu)(chu)(chu)(chu)信(xin)號基(ji)本(ben)不(bu)隨(sui)輸(shu)入(ru)信(xin)號的(de)(de)(de)(de)(de)(de)(de)變化(hua)而變化(hua),輸(shu)出(chu)(chu)(chu)(chu)信(xin)號幅值基(ji)本(ben)維持不(bu)變的(de)(de)(de)(de)(de)(de)(de)功(gong)(gong)能(neng)(neng),但(dan)是(shi)一(yi)般(ban)攝像機(ji)的(de)(de)(de)(de)(de)(de)(de)這種自(zi)(zi)動(dong)(dong)(dong)調節功(gong)(gong)能(neng)(neng)是(shi)有(you)(you)限的(de)(de)(de)(de)(de)(de)(de),一(yi)旦(dan)出(chu)(chu)(chu)(chu)現(xian)(xian)(xian)(xian)很強的(de)(de)(de)(de)(de)(de)(de)信(xin)號(如(ru)強烈(lie)的(de)(de)(de)(de)(de)(de)(de)逆(ni)光(guang)的(de)(de)(de)(de)(de)(de)(de)現(xian)(xian)(xian)(xian)象(xiang))超過(guo)了(le)一(yi)般(ban)攝像機(ji)自(zi)(zi)動(dong)(dong)(dong)調節范圍,放(fang)大(da)器(qi)(qi)就(jiu)飽和,就(jiu)起(qi)不(bu)到自(zi)(zi)動(dong)(dong)(dong)調節作(zuo)(zuo)用(yong)(yong),監視(shi)器(qi)(qi)畫(hua)面(mian)(mian)(mian)上(shang)就(jiu)會出(chu)(chu)(chu)(chu)現(xian)(xian)(xian)(xian)一(yi)片邊緣模糊的(de)(de)(de)(de)(de)(de)(de)白(bai)斑(逆(ni)光(guang)現(xian)(xian)(xian)(xian)象(xiang))。而超動(dong)(dong)(dong)態攝像機(ji)自(zi)(zi)動(dong)(dong)(dong)調節的(de)(de)(de)(de)(de)(de)(de)范圍比一(yi)般(ban)攝像機(ji)要大(da)。我(wo)們可以(yi)通過(guo)實踐感覺到,當現(xian)(xian)(xian)(xian)場(chang)中(zhong)出(chu)(chu)(chu)(chu)現(xian)(xian)(xian)(xian)畫(hua)面(mian)(mian)(mian)層次比較(jiao)豐(feng)富的(de)(de)(de)(de)(de)(de)(de)目(mu)(mu)標(biao)物(wu)(wu)體時(shi)(shi),用(yong)(yong)普(pu)通攝像機(ji)攝取(qu)目(mu)(mu)標(biao)物(wu)(wu)體時(shi)(shi),所獲得的(de)(de)(de)(de)(de)(de)(de)畫(hua)面(mian)(mian)(mian)層次較(jiao)多,所以(yi)選(xuan)用(yong)(yong)超動(dong)(dong)(dong)態攝像對畫(hua)面(mian)(mian)(mian)反差比較(jiao)大(da)的(de)(de)(de)(de)(de)(de)(de)逆(ni)光(guang)問(wen)題(ti),也(ye)能(neng)(neng)起(qi)到一(yi)定(ding)的(de)(de)(de)(de)(de)(de)(de)改(gai)(gai)善的(de)(de)(de)(de)(de)(de)(de)作(zuo)(zuo)用(yong)(yong)。 出(chu)(chu)(chu)(chu)入(ru)口(kou)出(chu)(chu)(chu)(chu)現(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)(de)逆(ni)光(guang)現(xian)(xian)(xian)(xian)象(xiang),往往是(shi)現(xian)(xian)(xian)(xian)場(chang)中(zhong)出(chu)(chu)(chu)(chu)現(xian)(xian)(xian)(xian)一(yi)個很亮的(de)(de)(de)(de)(de)(de)(de)背(bei)景(jing)和一(yi)個很暗的(de)(de)(de)(de)(de)(de)(de)前(qian)景(jing)目(mu)(mu)標(biao),而且背(bei)景(jing)和目(mu)(mu)標(biao)的(de)(de)(de)(de)(de)(de)(de)位置基(ji)本(ben)維持不(bu)變,選(xuan)用(yong)(yong)具(ju)有(you)(you)BLC功(gong)(gong)能(neng)(neng)(背(bei)景(jing)光(guang)補(bu)償功(gong)(gong)能(neng)(neng))的(de)(de)(de)(de)(de)(de)(de)攝像機(ji),可僅對現(xian)(xian)(xian)(xian)場(chang)某個區域求(qiu)平均值來確定(ding)AGC工作(zuo)(zuo)點,此時(shi)(shi)如(ru)果前(qian)景(jing)目(mu)(mu)標(biao)位于該區域時(shi)(shi),則前(qian)景(jing)目(mu)(mu)標(biao)的(de)(de)(de)(de)(de)(de)(de)清晰度可望提高。
(3)通過提(ti)高(gao)室(shi)內(nei)光(guang)(guang)(guang)源照度,改善(shan)(shan)逆(ni)(ni)(ni)光(guang)(guang)(guang)現(xian)象(xiang)(xiang)。通過提(ti)高(gao)室(shi)內(nei)光(guang)(guang)(guang)源的(de)(de)(de)照度也(ye)是(shi)改善(shan)(shan)逆(ni)(ni)(ni)光(guang)(guang)(guang)現(xian)象(xiang)(xiang)的(de)(de)(de)一(yi)條途(tu)徑(jing),圖(tu)(tu)像(xiang)(xiang)出(chu)(chu)現(xian)逆(ni)(ni)(ni)光(guang)(guang)(guang)現(xian)象(xiang)(xiang),主要是(shi)視(shi)場范圍光(guang)(guang)(guang)線(xian)照度強(qiang)(qiang)(qiang)弱反(fan)差(cha)太大(da)引起(qi)的(de)(de)(de)。安裝于出(chu)(chu)入(ru)(ru)口(kou)(kou)(kou)的(de)(de)(de)攝像(xiang)(xiang)機(ji),其監控范圍內(nei)的(de)(de)(de)室(shi)外光(guang)(guang)(guang)線(xian)強(qiang)(qiang)(qiang),室(shi)內(nei)光(guang)(guang)(guang)線(xian)弱,就(jiu)形成了圖(tu)(tu)像(xiang)(xiang)黑(hei)白層次反(fan)差(cha)太強(qiang)(qiang)(qiang)。這樣,如(ru)果(guo)通過提(ti)高(gao)室(shi)內(nei)光(guang)(guang)(guang)源的(de)(de)(de)照度,使(shi)室(shi)內(nei)光(guang)(guang)(guang)線(xian)增強(qiang)(qiang)(qiang)。減小與外界光(guang)(guang)(guang)亮的(de)(de)(de)反(fan)差(cha),也(ye)可以(yi)改善(shan)(shan)逆(ni)(ni)(ni)光(guang)(guang)(guang)現(xian)象(xiang)(xiang)。改善(shan)(shan)或者減少(shao)出(chu)(chu)入(ru)(ru)口(kou)(kou)(kou)的(de)(de)(de)逆(ni)(ni)(ni)光(guang)(guang)(guang)現(xian)象(xiang)(xiang),還有(you)一(yi)些其它輔助辦法,如(ru)在地(di)面鋪設一(yi)些地(di)毯,防(fang)止地(di)面光(guang)(guang)(guang)的(de)(de)(de)反(fan)射(she),在靠近(jin)出(chu)(chu)入(ru)(ru)口(kou)(kou)(kou)附近(jin)的(de)(de)(de)窗戶(hu),用(yong)(yong)窗簾遮擋陽光(guang)(guang)(guang)的(de)(de)(de)直射(she)等,都是(shi)輔助改善(shan)(shan)逆(ni)(ni)(ni)光(guang)(guang)(guang)現(xian)象(xiang)(xiang)的(de)(de)(de)方法。 出(chu)(chu)入(ru)(ru)口(kou)(kou)(kou)的(de)(de)(de)逆(ni)(ni)(ni)光(guang)(guang)(guang)現(xian)象(xiang)(xiang)是(shi)一(yi)個(ge)比較突出(chu)(chu)的(de)(de)(de)問(wen)題,而且這個(ge)問(wen)題的(de)(de)(de)解決,目前還沒有(you)找到一(yi)種最徹底,最有(you)效(xiao)的(de)(de)(de)辦法,以(yi)上介紹的(de)(de)(de)三種辦法,對改善(shan)(shan)逆(ni)(ni)(ni)光(guang)(guang)(guang)現(xian)象(xiang)(xiang)都有(you)一(yi)定作用(yong)(yong),需要將其綜合(he)起(qi)來(lai)應用(yong)(yong)。
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