IC697ALG445
IC697ALG445
通過已獲得的樣本來判斷人臉的位置,選取合適的人臉,截取出做樣本是重要的步驟。人臉特征定位與特征提取質量的好壞對于人臉圖像識別效果有直接的影響。首先確定人眼的坐標(x1,y1)和(x2,y2),由此可間接得到正方形人臉的左上頂點和右下頂點的坐標,設其分別為(X1,Y1)和(X2,Y2),其詳細計算方法如下所示
式中,RH和RV均為經驗常數,在設計過程中將其分別取值為2.0和3.5。如此可在原圖中得到人臉的區域座標,其尺寸隨眼距Widtheyes的大小而變化,但是作為PCA的輸入,要求輸入樣本的維數相同,所以必須對圖片進行歸一化處理。在設計中將所得人臉區域樣本均縮放至24×24。此外還需要對圖片進行對比度調節和直方圖均衡等操作,以提高識別的準確性。
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