隨著用戶對攝像機圖像效果要求的不斷提高，在明暗反差過大的場景中，如大廳、門口等光線差別比較大的場所，傳統攝像機只能依靠背光補償(BLC)功能來處理。當背光補償功能打開的時候，背景圖像會出現曝光過足，圖像發白、失真;當背光補償功能關閉的時候，前景圖像因為曝光不足而成為黑色。許多攝像機生產廠家為了解決這些問題，相應地對背光補償(BLC)采用了一些增強技術，但也僅是對局部圖像進行處理，無法得到理想的全局圖像。因此必須有一種具有新技術的攝像機，來滿足逆光環境下對攝像機的要求。寬動態技術攝像機應運而生，逐漸成為各大攝像機生產廠商關注的焦點。
寬動態攝像機介紹
按照度值來衡量，當攝像機從室內看窗外，室內照度為100Lux，而外面的照度可能是在10,000Lux，對比就是10,000/100=100：1。在這種對比下人眼能很容易的同時看清室內和室外的物體，因為人眼能處理1000:1的對比度。然而傳統CCD攝像機就會有很大的問題。因為傳統攝像機只有3:1的對比性能。
安裝現場復雜的光線環境，導致只能看到監控目標的輪廓，同時會出現畫面被破壞、缺乏色彩層次等問題。當使用最慢為1/50秒的電子快門來取得室內較暗處目標的正確曝光，但在這種情況下室外明亮處的圖像由于過度曝光會變白(過亮);當選擇最快1/6000秒取得室外明亮處影像的完美的曝光，但是室內較暗處的影像會由于欠曝光而變黑(過暗)。這是一個自從監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" 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title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控" title="監控">監控攝像機被發明以來就一直長期困擾使用者的問題。
寬動態攝像機技術是在非常強烈的對比下讓攝像機看到物體圖像而運用的一種技術。當在強光源(日光、燈具或反光等)照射下的高亮度區域及陰影、逆光等相對亮度較低的區域在圖像中同時存在時，攝像機輸出的圖像會出現明亮區域因曝光過度成為白色，而黑暗區域因曝光不足成為黑色，嚴重影響圖像質量。攝像機在同一場景中對最亮區域及較暗區域的表現是存在局限的，這種局限就是通常所講的“動態范圍”。
廣義上的“動態范圍”是指某一變化的事物可能改變的跨度，即其變化值的最低端極點到最高端極點之間的區域，此區域的描述一般為最高點與最低點之間的差值。這是一個應用非常廣泛的概念，在談及攝像機產品的拍攝圖像指標時，一般的“動態范圍”是指攝像機對拍攝場景中景物光照反射的適應能力，具體指亮度(反差)及色溫(反差)的變化范圍。
1、與傳統CCD相比DPS攝像機是真正的數字攝像機
傳統CCD攝像機在圖像的采集、處理和輸出過程中需要經過兩次模擬信號的轉換過程，從CCD(模擬)——A/D轉換——處理器(DSP)——D/A轉換——輸出(模擬)，存在著傳輸時間長(整個傳輸轉換過程需要數十毫秒)，轉換噪聲大，視頻信號衰減等缺陷。
DPS攝像機的工作原理
DPS(DigitalPixelSystem數字像素處理系統)攝像機包含有一個數字的圖像傳感器和一個數字的圖像處理器。其核心技術是在數字圖像傳感器的每一個像素上集成了一個模擬數字轉換器(ADC)，每個數字圖像傳感器的ADC在捕捉到光信號時直接轉換為數字信號，從采樣到輸出的過程，單幀圖像獲取時間僅需0.8毫秒，最大限度地減少了無效的轉換，降低了噪音和衰減。
傳統CCD攝像機工作原理
DPS攝像機在整個圖像的獲取、傳輸和處理中，不論前端的拾取還是后端的處理完全是數字化的過程。保證了獲取圖像的高質量性，在輸出后的圖像無任何拖尾和開花現象。是真正純數字化的圖像處理系統。
2、DPS的多重采樣技術
傳統CCD攝像機只能同時處理一整列像素，在采集一幅圖像的過程中通常只對整個圖像采樣1次，獲取的圖像會出現不同程度的明亮的區域曝光過度、較暗的區域欠曝光的現象(如下圖)。其它些所謂的寬動態攝像機也僅是采取兩次或多次采樣的方式合成一幅圖像，效果上雖有所改善，但不能從本質上徹底解決問題。
S1點亮度較高，控制采樣曝光的時間相對較短;S5點亮度較暗，曝光時間就較長。DPS攝像機實現逐點采樣逐點控制曝光，可同時獲取場景中明亮及陰暗區域詳細的圖像信息。
采用DPS技術的攝像機在采集一幅圖像時，系統可對每個像素進行多次單獨無損失采樣，成像系統控制每個像素的最佳采樣時間，在每個像素達到最佳狀態時存儲像素信息，最終可同時獲取場景中明亮及陰暗區域詳細的圖像信息。
3、模擬人眼與大腦，圖像傳感器和圖像處理器具有雙向實時互動性
模擬人眼與大腦，圖像傳感器和圖像處理器具有雙向實時互動性。DPS攝像機在圖像的攝取和處理過程類似于人眼和大腦的關系，負責圖像的處理和運算的同時，不斷向圖像傳感器下達指令，不僅調整曝光時間而且改變實際的圖像捕捉算法。最終，在特定的圖像特征和光照下，獲得最佳的圖像效果。
4、更寬的動態范圍和更真實的色彩再現
采用DPS技術的攝像機，通過其特有的數字采樣和數字處理，得到比CCD攝像機更寬的動態范圍(CCD的動態范圍最大為60dB，DPS可達到120dB)。
更加接近真實場景的色彩還原
5、強大的軟件應用
DPS攝像機內嵌ARM7CPU處理器，配以強大的軟件平臺，使許多傳統CCD攝像機無法企及的功能變得簡單有效。
l多語言界面平臺，NTSC/PAL制式兼容，可使攝像機打破傳統地域界限，實現產品國際化，為不同地區的使用者帶來方便;
l智能線纜傳輸長度補償、更寬的線鎖調整范圍、更寬的白平衡范圍，使調整、偏色等問題變得迎刃而解;
l日夜模式控制，采用可移動紅外濾片，白天用彩色，夜晚用黑白，增強夜晚感受紅外光的能力，突破傳統攝像機在低照下的技術瓶頸，解決在環境光線較暗的情況下圖像成像的問題;
l遠程攝像機的設置調整使原本煩瑣的安裝調試變得簡單輕松;
l同樣數字化的信號輸出可直接提供給高端的顯示設備以及編碼壓縮芯片，減少信號還原過程的損失，得到更加真實的圖像。
寬動態攝像機應用
DPS攝像機優良的寬動態特性可使其應用于光線落差較大的環境中(特別是從室內看向室外)看清全景中每個角落的細節，如安裝了寬大玻璃窗的辦公大廳、銀行、ATM機、幾乎每個商店、機場等，這些位于門口、窗口等處具有明亮背景光的監控場景，都可得到滿意的可辨識圖像，模擬攝像機在這類場景的監控受制其技術上的缺陷較難取得理想效果。
總結
DPS數字像素處理技術標志著在攝像機技術上的一個根本突破，代表了攝像機傳感器方面的一項突破性進展。它是一種捕捉高質量圖像的尖端技術，使用在最復雜及最苛刻的光照條件下。憑借著優良的寬動態技術，景陽寬動態攝像機將為用戶解決復雜光線環境下監控的諸多難題，最大程度上滿足各行各業對攝像機的不同需求。