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星光級攝像機 我有新說法
4117 1

　　在微光情況下，通常是是指星光環境下無任何輔助光源，可以顯示清晰的彩色圖像，區別于普通攝像機只能顯示黑白圖像。星光級攝像機特征：不需要紅外燈也不需要白光燈、晚上可以實現不拖尾清晰的彩色監控。

1概述

　　星光級攝像機英文名Stellarcamera

　　星光級攝像機種類：半球型攝像機、槍式攝像機、防水一體機、防暴半球攝像機。

　　星光級攝像機是指在微光情況下、通常指星光環境下無任何輔助光源，可以顯示清晰的彩色圖像的攝像機，它區別于普通攝像機只能顯示黑白圖像，這是工程商朋友喜愛星光級攝像機的主要原因之一，在夜間能夠彩色成像的攝像機能夠極大的提高監控效果。同時，星光級采用了超靈敏度圖像傳感器和*的電子倍增和噪點控制技術能夠極大地提高攝像機的靈敏度，并且具備24小時全彩色實時效果，*普通低照度攝像機出現的拖尾現象，以滿足對夜間高品質監控的需求，而且功耗小、圖像效果真實、不偏色。根據標準化的定義，當照度范圍達到并超過了0.0001Lux的時候，便達到了“星光級”的超低照度攝像機。

2影響星光級攝像機的因素有三個

　　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，分配到每個像素的感光面積就越小，一個曝光周期內的通光量就越小，低照度效果就越差。比如都是1/3英寸的傳感器，普通模擬攝像機大約為30萬像素，而高清攝像機則至少是200萬像素，像素點是模擬攝像機的8倍，而每一個像素的感光面積則只有模擬攝像機的1/8，如果不采用*的傳感器，其高清畫質在夜間會慘不忍睹。

　　其次是ISP的調整。經常可以在市面上各家效果進行PK的時候發現同樣的方案，同樣的傳感器，但是各個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整就是很重要的圖像處理過程，噪點會使圖像顯得不清晰，但降噪處理不當又會造成嚴重的霧感、拖影，損失細節等現象。伽馬曲線數值設置的過高會讓畫面的對比度增加，畫面變暗，畫質通透，但是會丟失細節;伽馬曲線數值設置的過低又會使圖像變亮，細節會增加，但是畫質通透度變差。所以即使基于相同的硬件平臺，產品的終效果也各有不同，這其中就體現了不同廠家的研發能力。

　　后是鏡頭的影響，鏡頭大光圈值是其中很重要的一個因素。光圈越大進光量越大，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，即場景中聚焦清晰的范圍越小，所以鏡頭光圈值也需要根據實際場景調節，不能為了進光量一味的增大光圈。與此類似的另一個參數是攝像機慢快門，當快門越慢，進光量越大，畫面亮度提高，但相對的運動物體的拖影也越嚴重，所以快門值也是雙面的，需要根據具體應用場景設置相應的值。


參考資料

參考資料編輯區域


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