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星光級(jí)攝像機(jī) 我有新說(shuō)法
5080 1

　　在微光情況下，通常是是指星光環(huán)境下無(wú)任何輔助光源，可以顯示清晰的彩色圖像，區(qū)別于普通攝像機(jī)只能顯示黑白圖像。星光級(jí)攝像機(jī)特征：不需要紅外燈也不需要白光燈、晚上可以實(shí)現(xiàn)不拖尾清晰的彩色監(jiān)控。

1概述

　　星光級(jí)攝像機(jī)英文名Stellarcamera

　　星光級(jí)攝像機(jī)種類：半球型攝像機(jī)、槍式攝像機(jī)、防水一體機(jī)、防暴半球攝像機(jī)。

　　星光級(jí)攝像機(jī)是指在微光情況下、通常指星光環(huán)境下無(wú)任何輔助光源，可以顯示清晰的彩色圖像的攝像機(jī)，它區(qū)別于普通攝像機(jī)只能顯示黑白圖像，這是工程商朋友喜愛(ài)星光級(jí)攝像機(jī)的主要原因之一，在夜間能夠彩色成像的攝像機(jī)能夠極大的提高監(jiān)控效果。同時(shí)，星光級(jí)采用了超靈敏度圖像傳感器和*的電子倍增和噪點(diǎn)控制技術(shù)能夠極大地提高攝像機(jī)的靈敏度，并且具備24小時(shí)全彩色實(shí)時(shí)效果，*普通低照度攝像機(jī)出現(xiàn)的拖尾現(xiàn)象，以滿足對(duì)夜間高品質(zhì)監(jiān)控的需求，而且功耗小、圖像效果真實(shí)、不偏色。根據(jù)標(biāo)準(zhǔn)化的定義，當(dāng)照度范圍達(dá)到并超過(guò)了0.0001Lux的時(shí)候，便達(dá)到了“星光級(jí)”的超低照度攝像機(jī)。

2影響星光級(jí)攝像機(jī)的因素有三個(gè)

　　首先是傳感器的選擇。*，同樣感光面積的圖像傳感器，像素越高，分配到每個(gè)像素的感光面積就越小，一個(gè)曝光周期內(nèi)的通光量就越小，低照度效果就越差。比如都是1/3英寸的傳感器，普通模擬攝像機(jī)大約為30萬(wàn)像素，而高清攝像機(jī)則至少是200萬(wàn)像素，像素點(diǎn)是模擬攝像機(jī)的8倍，而每一個(gè)像素的感光面積則只有模擬攝像機(jī)的1/8，如果不采用*的傳感器，其高清畫(huà)質(zhì)在夜間會(huì)慘不忍睹。

　　其次是ISP的調(diào)整。經(jīng)?？梢栽谑忻嫔细骷倚ЧM(jìn)行PK的時(shí)候發(fā)現(xiàn)同樣的方案，同樣的傳感器，但是各個(gè)廠家的低照效果卻大相徑庭。在低照效果成像的ISP處理方面，降噪處理和伽馬曲線調(diào)整就是很重要的圖像處理過(guò)程，噪點(diǎn)會(huì)使圖像顯得不清晰，但降噪處理不當(dāng)又會(huì)造成嚴(yán)重的霧感、拖影，損失細(xì)節(jié)等現(xiàn)象。伽馬曲線數(shù)值設(shè)置的過(guò)高會(huì)讓畫(huà)面的對(duì)比度增加，畫(huà)面變暗，畫(huà)質(zhì)通透，但是會(huì)丟失細(xì)節(jié);伽馬曲線數(shù)值設(shè)置的過(guò)低又會(huì)使圖像變亮，細(xì)節(jié)會(huì)增加，但是畫(huà)質(zhì)通透度變差。所以即使基于相同的硬件平臺(tái)，產(chǎn)品的終效果也各有不同，這其中就體現(xiàn)了不同廠家的研發(fā)能力。

　　后是鏡頭的影響，鏡頭大光圈值是其中很重要的一個(gè)因素。光圈越大進(jìn)光量越大，從而彩色效果越好，反之則效果越差，但鏡頭光圈越大，景深卻越淺，即場(chǎng)景中聚焦清晰的范圍越小，所以鏡頭光圈值也需要根據(jù)實(shí)際場(chǎng)景調(diào)節(jié)，不能為了進(jìn)光量一味的增大光圈。與此類似的另一個(gè)參數(shù)是攝像機(jī)慢快門，當(dāng)快門越慢，進(jìn)光量越大，畫(huà)面亮度提高，但相對(duì)的運(yùn)動(dòng)物體的拖影也越嚴(yán)重，所以快門值也是雙面的，需要根據(jù)具體應(yīng)用場(chǎng)景設(shè)置相應(yīng)的值。


參考資料

參考資料編輯區(qū)域


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高分辨率可達(dá)1920 × 1080@25fps,在該分辨率下可輸出實(shí)時(shí)圖像
碼流平滑設(shè)置，適應(yīng)不同場(chǎng)景下對(duì)圖像質(zhì)量、流暢性的不同要求
支持OSD顏色自選
支持3D數(shù)字降噪, 支持120dB寬動(dòng)態(tài)
功能齊全: 一鍵恢復(fù),心跳,鏡像等
紅外功能
高效陣列紅外燈,使用壽命長(zhǎng),照射距離遠(yuǎn)可達(dá)30米(I3)/50米(I5)/80米(I8)
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