IC693MDL940
根據(jù)指紋圖像分析,過干手指的指紋圖像對比度較小,灰度較大;過濕手指的指紋圖像對比度較小,灰度較小。手指干/ 濕度分析算法要計算指紋圖像的灰度均值和標準差。具體步驟如下:
1)分別計算每一個前景圖像塊的灰度均值m、各前景塊所有像素的標準差δ、塊內(nèi)小于均值m 的所有像素的灰度均值μ;
2)求圖像塊的對比度Cd:
Cd = μ / δ (5)
若Cd 大于干圖像塊對比度閾值DTH1,則該圖像塊確認為干圖像塊;
3) 若Cd ≤ DTH1, 還需用圖像塊8 鄰域中對比度最大值和最小值的差值Var(Cd) 與閾值DTH2 進行比較。如果Var(Cd)》 DTH 2,則將該圖像塊標記為干圖像塊;
4)計算所有干圖像塊占前景圖像的比例,即為干度。如果干度超過閾值DTH3,則認為該手指過干,在漢字顯示屏上提示用戶手指過干;否則進行手指濕度分析;
5)為分析、計算手指濕度,引入濕度特征量:
Cs = μ / δ (6)
如果Cs 小于預設的閾值STH1,則標記該圖像塊為濕圖像塊;
6)統(tǒng)計所有濕圖像塊占前景圖像的比例,即為濕度。若濕度超過濕圖像塊比例閾值STH2,則提示用戶手指過濕。若濕度≤ STH2,則該指紋圖像判定為低質(zhì)量圖像。
IC693MDL940
IC693MDL940聯(lián)系人:李先生
手機:18030229050
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