140DVO85300

的圖像預(yù)處理

　　TVP5147芯片輸出的圖像數(shù)據(jù)并非RGB格式，而是以YUV格式輸出的。需要通過(guò)DSP處理器轉(zhuǎn)換成RGB格式，才能進(jìn)行圖像的預(yù)處理，轉(zhuǎn)換公式如式（4）所示。

　　DSP將圖像數(shù)據(jù)讀入內(nèi)存空間，然后對(duì)其進(jìn)行運(yùn)算，將得到的RGB分別放到對(duì)應(yīng)的存儲(chǔ)單元，并算出灰度值Gray，運(yùn)算公式如式（5）所示。
      

　　將后得到的灰度值存放到對(duì)應(yīng)的數(shù)組當(dāng)中。每張圖片由兩場(chǎng)圖片構(gòu)成，所以完整的圖片分辨率為720×576。但是對(duì)于系統(tǒng)本身無(wú)需對(duì)其每一個(gè)像素都進(jìn)行轉(zhuǎn)換，所以截取其中320×240進(jìn)行存儲(chǔ)，這樣每場(chǎng)的分辨率為320×120，大大降低了由YUV到灰度圖像預(yù)處理和臉部定位的時(shí)間，提高了系統(tǒng)的性能。

140DVO85300

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