IC693PCM300
IC693PCM300
指紋灰度圖像的前、背景分離
用點(diǎn)方向圖表示所述隔點(diǎn)原始指紋灰度圖像中每一像素點(diǎn)處的局部紋理走向,具體如下:
指紋圖像是由局部平行的脊線和谷線構(gòu)成的一種方向模式。通過(guò)指紋圖像點(diǎn)方向圖計(jì)算,可將指紋圖像中的各個(gè)圖像塊劃分為前景塊或背景塊。采用7×7 模板,基準(zhǔn)點(diǎn)位于模板中心,從水平位置開始每隔π/4 確定一個(gè)方向,定義I=1,2,3,4,對(duì)應(yīng)0,π/4,2π/4,3π/4,π 四個(gè)方向。按公式(1)計(jì)算各個(gè)方向的灰度變化DI,比較DI,找到最小值,就代表該點(diǎn)的方向,見(jiàn)公式(1):
式中,是沿I方向上點(diǎn)的灰度均值,f1(ik , jk) 是I方向上點(diǎn)的灰度值。
IC693PCM300聯(lián)系人:李先生
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