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夜視攝像頭:視頻(pin)監控讓(rang)黑(hei)夜不再煩(fan)惱(nao)
時(shi)間:2018-07-03 來源:本站(zhan) 瀏(liu)覽:2690次(ci)
夜(ye)視攝(she)像頭:視頻(pin)監控讓黑夜(ye)不再(zai)煩惱(nao)
視(shi)頻(pin)監控在白天的作(zuo)用大家(jia)都知道能夠拍到清晰地圖片,但是(shi)一般的違法(fa)行為都發生在夜晚,這就給視(shi)頻(pin)監控領域一個很大的挑(tiao)戰。下面筆者給大家(jia)介紹下如何在黑夜中讓(rang)視(shi)頻(pin)監控也(ye)更(geng)有效。
在(zai)日常監控需(xu)求中,大家往(wang)往(wang)比較關注于白(bai)天監控攝像(xiang)機所拍出來效(xiao)果,而忽略了夜間監控。其(qi)實(shi),夜晚監控技(ji)術(shu)往(wang)往(wang)更勝(sheng)于白(bai)天;其(qi)不僅要(yao)具備(bei)超強紅(hong)外夜視(shi)功(gong)(gong)能(neng)、低(di)照度功(gong)(gong)能(neng)、寬動態功(gong)(gong)能(neng)等,為(wei)了實(shi)現(xian)夜間的高清晰抓拍,如何(he)將多種技(ji)術(shu)融合在(zai)一部監控攝像(xiang)機才是我們深(shen)思問題。
其實,白天(tian)(tian)監控效果之(zhi)所以不(bu)(bu)會讓(rang)人擔憂,還是取決(jue)于光線的(de)(de)(de)(de)問題。晴朗(lang)的(de)(de)(de)(de)天(tian)(tian)空給(gei)予足夠的(de)(de)(de)(de)自然光,配上高清監控攝像(xiang)機與(yu)高清鏡(jing)頭,想必很難抓拍出模(mo)糊的(de)(de)(de)(de)畫面。但是,當黑(hei)夜降(jiang)臨時,光線的(de)(de)(de)(de)不(bu)(bu)足就(jiu)成為夜視監控的(de)(de)(de)(de)一大弊端。所以在視頻監控領域(yu),無論是監控產(chan)品還是值守在監控指揮中心(xin)的(de)(de)(de)(de)人來說,白天(tian)(tian)永遠也不(bu)(bu)懂(dong)夜間監控的(de)(de)(de)(de)痛苦。不(bu)(bu)禁(jin)讓(rang)筆者想起了(le)一首歌(ge)“白天(tian)(tian)不(bu)(bu)懂(dong)夜的(de)(de)(de)(de)黑(hei)“。
言歸正傳,既(ji)然(ran)夜間監(jian)(jian)控(kong)(kong)(kong)出現了如此多(duo)的(de)(de)(de)問題(ti),又有(you)(you)(you)(you)哪些方(fang)法(fa)避免(mian)夜視監(jian)(jian)控(kong)(kong)(kong)的(de)(de)(de)弊端呢?首先,嵌有(you)(you)(you)(you)紅(hong)(hong)外(wai)(wai)燈(deng)的(de)(de)(de)監(jian)(jian)控(kong)(kong)(kong)攝(she)像機成(cheng)為(wei)目前(qian)市場(chang)中的(de)(de)(de)主流產品;紅(hong)(hong)外(wai)(wai)燈(deng)有(you)(you)(you)(you)三種(zhong),鹵(lu)素(su)燈(deng)+濾光(guang)片(pian)成(cheng)為(wei)是(shi)傳統的(de)(de)(de)紅(hong)(hong)外(wai)(wai)燈(deng),由(you)于其功耗較大(da)已逐漸被市場(chang)淘(tao)汰;LED二極管代替(ti)了傳統的(de)(de)(de)紅(hong)(hong)外(wai)(wai)燈(deng),因單(dan)芯(xin)片(pian)與多(duo)芯(xin)片(pian)的(de)(de)(de)區別,目前(qian)市場(chang)中還是(shi)以(yi)陣列式紅(hong)(hong)外(wai)(wai)監(jian)(jian)控(kong)(kong)(kong)攝(she)像機為(wei)主,高熱量、難散熱問題(ti)仍然(ran)沒(mei)有(you)(you)(you)(you)得(de)到有(you)(you)(you)(you)效(xiao)解(jie)決;激(ji)光(guang)紅(hong)(hong)外(wai)(wai)不(bu)(bu)擔心(xin)功耗也不(bu)(bu)擔心(xin)散熱,但是(shi)它的(de)(de)(de)弊端在(zai)于監(jian)(jian)控(kong)(kong)(kong)角度有(you)(you)(you)(you)很大(da)的(de)(de)(de)局限(xian)性。
夜視監(jian)控(kong)面(mian)臨著各種各樣的問題,如何實現低(di)功耗(hao)、散熱好、遠距離大角度(du)監(jian)控(kong)呢?或許我們期待(dai)有(you)一天,當激光與熱成像技(ji)術(shu)成熟時,能(neng)夠解(jie)決所有(you)夜視監(jian)控(kong)的難題。
當白天監(jian)控不(bu)為光(guang)線問題(ti)而擔憂時,夜視(shi)監(jian)控不(bu)能永遠停滯(zhi)不(bu)前。通過低照度(du)、寬動態技術(shu)或許能夠彌補這(zhe)一弊(bi)端。在(zai)合理的(de)布線、供(gong)電情況下,體驗一下真正(zheng)的(de)夜視(shi)清晰抓拍的(de)效(xiao)果(guo)。那么,如何(he)提高夜視(shi)監(jian)控效(xiao)果(guo)?
方(fang)法一:選擇夜視效果(guo)好的監控攝像機
俗話(hua)說“好馬配(pei)好鞍“,市場中(zhong)大部分監(jian)控攝(she)像機都具(ju)有日夜自(zi)動轉換(huan)功能,若想(xiang)在夜晚實現較為(wei)清晰的監(jian)控效果,監(jian)控攝(she)像機+紅(hong)外(wai)鏡(jing)頭就成(cheng)(cheng)為(wei)標準配(pei)置(zhi)。我們都知道百萬(wan)像素監(jian)控攝(she)像機必(bi)須配(pei)百萬(wan)像素鏡(jing)頭,標清鏡(jing)頭呈現的效果難以入目。同理,ICR切(qie)換(huan)的攝(she)像機必(bi)須配(pei)紅(hong)外(wai)鏡(jing)頭,因可見光和(he)紅(hong)外(wai)光波長不同,成(cheng)(cheng)像時(shi)不能聚焦在同一(yi)點(dian),紅(hong)外(wai)鏡(jing)頭可使紅(hong)外(wai)光和(he)可見光聚焦在同一(yi)點(dian)上,從(cong)而得到清晰的成(cheng)(cheng)像。
方法二:開啟紅(hong)外補(bu)光燈(deng)彌補(bu)光纖不足
正如上面(mian)所(suo)說,夜(ye)視監(jian)控(kong)(kong)效果(guo)之所(suo)以無法與(yu)白天監(jian)控(kong)(kong)效果(guo)相比,絕大部(bu)分問(wen)題出(chu)于(yu)光(guang)(guang)線問(wen)題。夜(ye)晚監(jian)控(kong)(kong)大多處于(yu)零(ling)光(guang)(guang)照或光(guang)(guang)線不(bu)足情(qing)況。夜(ye)幕(mu)降臨(lin)時,鐵路、小(xiao)區、樓道等光(guang)(guang)線低,易出(chu)現安全(quan)隱患;廣場、停車場監(jian)控(kong)(kong)范圍廣,光(guang)(guang)線不(bu)足容易造成看不(bu)清(qing)的(de)狀(zhuang)況。在(zai)必(bi)要的(de)條件下,打開紅外補光(guang)(guang)燈(deng),讓監(jian)控(kong)(kong)還你(ni)一(yi)個(ge)清(qing)晰(xi)的(de)畫面(mian)和寬(kuan)闊的(de)視角(jiao)。