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title="監(jiān)控">監(jiān)控方式靈活等特點，已廣泛應用于平安城市、校園監(jiān)控、無人值守變電站等場所。高速球已越來越為人所熟知。隨著高速球市場需求的提升，應用開始呈現(xiàn)多元化發(fā)展。由于高清化、智能化、網(wǎng)絡化等技術的迅猛發(fā)展，促使了高速球的特色功能層出不窮。

　　網(wǎng)絡高速球是高速球特色發(fā)展的重要分支，是模擬高速球和IP技術融合發(fā)展的完美結晶。在高速球基礎上，只要增加一塊IP模塊即可構成一個基本的網(wǎng)絡型高速球。在結構上，網(wǎng)絡智能高速球最少只需引出電源線與一根網(wǎng)線即可，其布線更加方便。在傳輸方式上，網(wǎng)絡智能高速球通過網(wǎng)絡進行傳播，傳播的是數(shù)字信號，傳輸范圍廣，容易實現(xiàn)遠程接入。

　　未來技術發(fā)展趨勢

　　高清化

　　隨著國際市場和國內市場對于監(jiān)控系統(tǒng)的普及和大量使用，人們對圖像的要求越來越高：從最開始能看到圖像，到現(xiàn)在的要清晰的圖像，到今后的能進行處理分析的高清晰圖像。整個市場高清化的氛圍，消費者的需求無疑刺激高清百萬像素網(wǎng)絡球機等高清技術與產(chǎn)品的快速普及。

　　傳統(tǒng)的網(wǎng)絡球主要基于CIF和D1分辨率的視頻處理，視頻可視范圍小，分辨率不足以看清圖像細節(jié)。高清網(wǎng)絡球首先解決了“看得清”的難題，最高達1920×1080的分辨率將視頻細節(jié)表現(xiàn)得一覽無余；其次16：9的視頻格式同樣解決了“看得廣”的難題，相對于4：3的傳統(tǒng)監(jiān)控視頻，高清網(wǎng)絡編碼直接提升了30%的可視寬度，更適合安防監(jiān)控領域應用。特別是以下場所，高清網(wǎng)絡球可以大展拳腳：

　　1、大型室內監(jiān)控

　　非常適合類似球場、會館、圖書館等大范圍的室內場合應用，高清的畫質和寬廣的可視角度地特點將有利于安保系統(tǒng)的監(jiān)控。高清網(wǎng)絡球甚至可以監(jiān)控到具體的一個物品的特征，從而保障場館的安全性。

　　2、路面、卡口監(jiān)控

　　寬闊的路面和卡口往往是傳統(tǒng)監(jiān)控的難題。以一個普通十字路口為例，往往需要3-4個攝像機配合使用才能覆蓋，而且由于圖像的清晰度不夠問題，為了看清一個物體往往需要對鏡頭拉伸，并需要頻繁的轉動。高清網(wǎng)絡球的出現(xiàn)，可以提供近6倍于傳統(tǒng)監(jiān)控的可視范圍和解析能力，直接可以看清畫面中的任意局部細節(jié)，一般無需對鏡頭的進行操作。且更寬的可視寬度保證了1-2個攝像機即可覆蓋整個路口，減少了監(jiān)控管理上的負擔。

　　同樣對于高速卡口、路面等大場景下監(jiān)控環(huán)境，高清網(wǎng)絡球提供了管理者極大的便利性和有效的監(jiān)控質量。

　　3、電力系統(tǒng)

　　適用于發(fā)電站、變電所、室外鐵塔、高危地區(qū)等電力系統(tǒng)視頻監(jiān)控。

　　4、智能化分析

　　高分辨率、高清晰度的圖像為智能分析提供了無與倫比的圖像源，提高后期視頻分析的準確度和可靠性。

　　高清網(wǎng)絡球作為一款高性能的編碼設備，在應用功能一般主要基于圖1所示的四大模塊：視頻模塊、音頻模塊、編碼模塊、網(wǎng)絡模塊。
 

　　視頻模塊：

　　視頻模塊主要負責采集高清一體化攝像機的HD-SDI / SDI信號，并進行重建和解碼工作，將單線串行的HD-SDI / SDI信號解碼成YCbCr數(shù)據(jù)送至編碼模塊，數(shù)據(jù)流如圖1-2。如果攝像機直接輸出YCbCr數(shù)據(jù)則此模塊可省略。

　　音頻模塊：

　　音頻模塊由編碼和解碼組成。前端采集模擬音頻信號，包括線形輸入和麥克風輸入，并解碼成IIS數(shù)據(jù)送至編碼模塊。解碼部分將編碼模塊完成的IIS數(shù)據(jù)編碼成語音信號，經(jīng)有源放大輸出。

　　編碼模塊：

　　編碼模塊主要負責視頻和音頻的編碼和解碼工作。視頻編解碼支持H.264、MJPEG編碼格式，分辨率最大支持1920×1080，可進行實時High、Main和Baseline profiles的H.264編碼。音頻編解碼支持AAC，MP3、G.711等主流格式。

　　網(wǎng)絡模塊：

　　網(wǎng)絡部分兼容10M和100M以太網(wǎng)，負責將音視頻數(shù)據(jù)發(fā)送至服務器、存儲，支持RTSP等標準網(wǎng)絡協(xié)議，可進行web操作。