IC693NIU004
1）使用公式（2）進(jìn)行計(jì)算：
其中，f（i， j）為（i， j）點(diǎn)的灰度值；
為I方向上灰度值的累加和；Smax 為累加和值的上限值；Smin 為累和值的下限值。如果滿足公式（2） 的條件，則當(dāng)前點(diǎn)為前景點(diǎn)；否則為背景點(diǎn)。
2）依據(jù)小塊內(nèi)背景點(diǎn)的比例，判斷各圖像塊是前景塊或背景塊。如果小塊內(nèi)背景點(diǎn)的數(shù)量超過閾值Tb，則認(rèn)為該圖像塊屬于背景塊，否則為前景塊。
2.4 指紋圖像質(zhì)量分析
通過圖像質(zhì)量判斷條件，比較質(zhì)量評估參數(shù)Q 與閾值TQ.若Q ≤ TQ，說明圖像質(zhì)量未達(dá)到要求，需要進(jìn)行手指干/ 濕狀態(tài)分析，并在漢字顯示屏上提示分析結(jié)果；若Q 》TQ，說明圖片質(zhì)量達(dá)到要求，但還需判斷手指位置是否放置正確。具體如下：
1）依據(jù)該塊內(nèi)的各點(diǎn)是否大部分屬于某一特定方向，判斷一個(gè)前景圖像塊是否具有方向優(yōu)勢；
2）計(jì)算各圖像塊的方向，求出各塊的方向直方圖。如果具有某一個(gè)方向D 的像素?cái)?shù)目超過預(yù)設(shè)值T1，則該塊的優(yōu)勢方向被標(biāo)記為D；
3）指紋圖像的質(zhì)量可以通過計(jì)算連續(xù)的優(yōu)勢方向區(qū)域占所有指紋前景圖的比例進(jìn)行描述。采取一種加權(quán)的方法，距離參考點(diǎn)越遠(yuǎn)的圖像塊，它所包含的信息越可靠，其權(quán)值也就越高；
IC693NIU004
IC693NIU004聯(lián)系人：李先生
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