隨著用戶對攝像機(jī)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(tǒng)攝像機(jī)只能依靠背光補(bǔ)償(BLC)功能來處理。當(dāng)背光補(bǔ)償功能打開的時(shí)候，背景圖像會(huì)出現(xiàn)曝光過足，圖像發(fā)白、失真;當(dāng)背光補(bǔ)償功能關(guān)閉的時(shí)候，前景圖像因?yàn)槠毓獠蛔愣蔀楹谏ＴS多攝像機(jī)生產(chǎn)廠家為了解決這些問題，相應(yīng)地對背光補(bǔ)償(BLC)采用了一些增強(qiáng)技術(shù)，但也僅是對局部圖像進(jìn)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(shù)的攝像機(jī)，來滿足逆光環(huán)境下對攝像機(jī)的要求。寬動(dòng)態(tài)技術(shù)攝像機(jī)應(yīng)運(yùn)而生，逐漸成為各大攝像機(jī)生產(chǎn)廠商關(guān)注的焦點(diǎn)。

　　寬動(dòng)態(tài)攝像機(jī)介紹

　　按照度值來衡量，當(dāng)攝像機(jī)從室內(nèi)看窗外，室內(nèi)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(shí)看清室內(nèi)和室外的物體，因?yàn)槿搜勰芴幚?000:1的對比度。然而傳統(tǒng)CCD攝像機(jī)就會(huì)有很大的問題。因?yàn)閭鹘y(tǒng)攝像機(jī)只有3:1的對比性能。

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title="監(jiān)控">監(jiān)控" title="監(jiān)控">監(jiān)控" title="監(jiān)控">監(jiān)控" title="監(jiān)控">監(jiān)控" title="監(jiān)控">監(jiān)控" title="監(jiān)控">監(jiān)控攝像機(jī)被發(fā)明以來就一直長期困擾使用者的問題。

　　寬動(dòng)態(tài)攝像機(jī)技術(shù)是在非常強(qiáng)烈的對比下讓攝像機(jī)看到物體圖像而運(yùn)用的一種技術(shù)。當(dāng)在強(qiáng)光源(日光、燈具或反光等)照射下的高亮度區(qū)域及陰影、逆光等相對亮度較低的區(qū)域在圖像中同時(shí)存在時(shí)，攝像機(jī)輸出的圖像會(huì)出現(xiàn)明亮區(qū)域因曝光過度成為白色，而黑暗區(qū)域因曝光不足成為黑色，嚴(yán)重影響圖像質(zhì)量。攝像機(jī)在同一場景中對最亮區(qū)域及較暗區(qū)域的表現(xiàn)是存在局限的，這種局限就是通常所講的“動(dòng)態(tài)范圍”。

　　廣義上的“動(dòng)態(tài)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(diǎn)到最高端極點(diǎn)之間的區(qū)域，此區(qū)域的描述一般為最高點(diǎn)與最低點(diǎn)之間的差值。這是一個(gè)應(yīng)用非常廣泛的概念，在談及攝像機(jī)產(chǎn)品的拍攝圖像指標(biāo)時(shí)，一般的“動(dòng)態(tài)范圍”是指攝像機(jī)對拍攝場景中景物光照反射的適應(yīng)能力，具體指亮度(反差)及色溫(反差)的變化范圍。

　　DPS寬動(dòng)態(tài)攝像機(jī)技術(shù)

　　1、與傳統(tǒng)CCD相比DPS攝像機(jī)是真正的數(shù)字?jǐn)z像機(jī)

　　傳統(tǒng)CCD攝像機(jī)在圖像的采集、處理和輸出過程中需要經(jīng)過兩次模擬信號的轉(zhuǎn)換過程，從CCD(模擬)——A/D轉(zhuǎn)換——處理器(DSP)——D/A轉(zhuǎn)換——輸出(模擬)，存在著傳輸時(shí)間長(整個(gè)傳輸轉(zhuǎn)換過程需要數(shù)十毫秒)，轉(zhuǎn)換噪聲大，視頻信號衰減等缺陷。

　　DPS攝像機(jī)的工作原理

　　DPS(DigitalPixelSystem數(shù)字像素處理系統(tǒng))攝像機(jī)包含有一個(gè)數(shù)字的圖像傳感器和一個(gè)數(shù)字的圖像處理器。其核心技術(shù)是在數(shù)字圖像傳感器的每一個(gè)像素上集成了一個(gè)模擬數(shù)字轉(zhuǎn)換器(ADC)，每個(gè)數(shù)字圖像傳感器的ADC在捕捉到光信號時(shí)直接轉(zhuǎn)換為數(shù)字信號，從采樣到輸出的過程，單幀圖像獲取時(shí)間僅需0.8毫秒，最大限度地減少了無效的轉(zhuǎn)換，降低了噪音和衰減。

　　傳統(tǒng)CCD攝像機(jī)工作原理

　　DPS攝像機(jī)在整個(gè)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(shù)字化的過程。保證了獲取圖像的高質(zhì)量性，在輸出后的圖像無任何拖尾和開花現(xiàn)象。是真正純數(shù)字化的圖像處理系統(tǒng)。

　　2、DPS的多重采樣技術(shù)

　　傳統(tǒng)CCD攝像機(jī)只能同時(shí)處理一整列像素，在采集一幅圖像的過程中通常只對整個(gè)圖像采樣1次，獲取的圖像會(huì)出現(xiàn)不同程度的明亮的區(qū)域曝光過度、較暗的區(qū)域欠曝光的現(xiàn)象(如下圖)。其它些所謂的寬動(dòng)態(tài)攝像機(jī)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(zhì)上徹底解決問題。

　　S1點(diǎn)亮度較高，控制采樣曝光的時(shí)間相對較短;S5點(diǎn)亮度較暗，曝光時(shí)間就較長。DPS攝像機(jī)實(shí)現(xiàn)逐點(diǎn)采樣逐點(diǎn)控制曝光，可同時(shí)獲取場景中明亮及陰暗區(qū)域詳細(xì)的圖像信息。

　　采用DPS技術(shù)的攝像機(jī)在采集一幅圖像時(shí)，系統(tǒng)可對每個(gè)像素進(jìn)行多次單獨(dú)無損失采樣，成像系統(tǒng)控制每個(gè)像素的最佳采樣時(shí)間，在每個(gè)像素達(dá)到最佳狀態(tài)時(shí)存儲(chǔ)像素信息，最終可同時(shí)獲取場景中明亮及陰暗區(qū)域詳細(xì)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?qū)崟r(shí)互動(dòng)性

　　模擬人眼與大腦，圖像傳感器和圖像處理器具有雙向?qū)崟r(shí)互動(dòng)性。DPS攝像機(jī)在圖像的攝取和處理過程類似于人眼和大腦的關(guān)系，負(fù)責(zé)圖像的處理和運(yùn)算的同時(shí)，不斷向圖像傳感器下達(dá)指令，不僅調(diào)整曝光時(shí)間而且改變實(shí)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(dòng)態(tài)范圍和更真實(shí)的色彩再現(xiàn)

　　采用DPS技術(shù)的攝像機(jī)，通過其特有的數(shù)字采樣和數(shù)字處理，得到比CCD攝像機(jī)更寬的動(dòng)態(tài)范圍(CCD的動(dòng)態(tài)范圍最大為60dB，DPS可達(dá)到120dB)。

　　更加接近真實(shí)場景的色彩還原

　　5、強(qiáng)大的軟件應(yīng)用

　　DPS攝像機(jī)內(nèi)嵌ARM7CPU處理器，配以強(qiáng)大的軟件平臺(tái)，使許多傳統(tǒng)CCD攝像機(jī)無法企及的功能變得簡單有效。

　　l多語言界面平臺(tái)，NTSC/PAL制式兼容，可使攝像機(jī)打破傳統(tǒng)地域界限，實(shí)現(xiàn)產(chǎn)品國際化，為不同地區(qū)的使用者帶來方便;

　　l智能線纜傳輸長度補(bǔ)償、更寬的線鎖調(diào)整范圍、更寬的白平衡范圍，使調(diào)整、偏色等問題變得迎刃而解;

　　l日夜模式控制，采用可移動(dòng)紅外濾片，白天用彩色，夜晚用黑白，增強(qiáng)夜晚感受紅外光的能力，突破傳統(tǒng)攝像機(jī)在低照下的技術(shù)瓶頸，解決在環(huán)境光線較暗的情況下圖像成像的問題;

　　l遠(yuǎn)程攝像機(jī)的設(shè)置調(diào)整使原本煩瑣的安裝調(diào)試變得簡單輕松;

　　l同樣數(shù)字化的信號輸出可直接提供給高端的顯示設(shè)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(shí)的圖像。

　　寬動(dòng)態(tài)攝像機(jī)應(yīng)用

　　DPS攝像機(jī)優(yōu)良的寬動(dòng)態(tài)特性可使其應(yīng)用于光線落差較大的環(huán)境中(特別是從室內(nèi)看向室外)看清全景中每個(gè)角落的細(xì)節(jié)，如安裝了寬大玻璃窗的辦公大廳、銀行、ATM機(jī)、幾乎每個(gè)商店、機(jī)場等，這些位于門口、窗口等處具有明亮背景光的監(jiān)控場景，都可得到滿意的可辨識(shí)圖像，模擬攝像機(jī)在這類場景的監(jiān)控受制其技術(shù)上的缺陷較難取得理想效果。

　　總結(jié)

　　DPS數(shù)字像素處理技術(shù)標(biāo)志著在攝像機(jī)技術(shù)上的一個(gè)根本突破，代表了攝像機(jī)傳感器方面的一項(xiàng)突破性進(jìn)展。它是一種捕捉高質(zhì)量圖像的尖端技術(shù)，使用在最復(fù)雜及最苛刻的光照條件下。憑借著優(yōu)良的寬動(dòng)態(tài)技術(shù)，景陽寬動(dòng)態(tài)攝像機(jī)將為用戶解決復(fù)雜光線環(huán)境下監(jiān)控的諸多難題，最大程度上滿足各行各業(yè)對攝像機(jī)的不同需求。