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指紋識別中的圖像處理研究------背景與基礎名詞解釋?zhuān)ǘ?/p> </div> </div> </div>    <div class="6j0z3g6" id="container"> <section> <article> <h1>指紋識別中的圖像處理研究------背景與基礎名詞解釋?zhuān)ǘ?/h1> <div id="86vaoto" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2014-11-20</span> <span>來(lái)源：網(wǎng)絡(luò )</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="olz8km3" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://dyxdggzs.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://dyxdggzs.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對面交流<br />海量資料庫查詢(xún)</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="fsnuima" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="33kftq6" class="content" id="contentDiv" style="position:relative;"> <div id="ww5cce6" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p><strong>　1.3幾種<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/生物識別"><em>生物識別</em></a>技術(shù)的比較</strong></p>本文引用地址：<a href="http://dyxdggzs.com/article/265699.htm">http://dyxdggzs.com/article/265699.htm</a><p>　　<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/生物識別"><em>生物識別</em></a>技術(shù)或使用人體的生理特征，或使用人的行為動(dòng)作。但是從識別的準確度而言，生理特征要比行為動(dòng)作更加可靠。因為生理特征反映了人體更本質(zhì)的部分，在操作過(guò)程中有更好的重復性，而且不易模仿、復制。目前，廣泛使用或熱點(diǎn)研究的<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/生物識別"><em>生物識別</em></a>技術(shù)有：人臉識別、<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/指紋識別"><em>指紋識別</em></a>、掌形識別、手部血管識別、虹膜識別、視網(wǎng)膜圖形識別、面部熱象圖識別、人耳識別、簽名識別和聲紋識別[36].其中人臉、指紋、掌形、手部血管、虹膜、面部熱象圖、人耳和視網(wǎng)膜圖形屬于生理特征，而簽名和聲紋屬于行為動(dòng)作。</p><p>　　人臉識別：是最直觀(guān)的，也是最常用的身份認證手段。根據其應用目的不同，人臉識別分為靜態(tài)識別和動(dòng)態(tài)識別兩種模式.所謂靜態(tài)識別就是用來(lái)識別的人臉圖像是靜態(tài)圖像，且背景及其它外界條件不變。這種情況下人臉的檢測和分割都非常簡(jiǎn)單，同一人臉的不同圖像間的距離比較小，因此識別就變得相對容易。</p><p><br /></p><center><img width="500" height="211" src="http://editerupload.eepw.com.cn/201411/aeb1ea71a5f5dc3c94e24883ce75906e.jpg" /></center><p><br /></p><p><br /></p><center><img width="500" height="198" src="http://editerupload.eepw.com.cn/201411/38f61698045e7199a64a4e52c746f521.jpg" /></center><p><br /></p><p><br /></p><center><img width="500" height="236" src="http://editerupload.eepw.com.cn/201411/1ba43bfe0937d9bd171551731c2c5d57.jpg" /></center><p><br /></p><p>　　而動(dòng)態(tài)人臉識別則是指在復雜的變化背景下對人臉進(jìn)行識別，這種識別模式干擾因素較多，目前還只是處于實(shí)驗室研究階段，還有許多問(wèn)題亟待解決。人臉識別還主要是利用人面部各器官如眼睛、眉毛、鼻子、嘴和下巴間的位置關(guān)系。目前，人臉識別中所用的有效的算法有基本元素分析法(PCA)，線(xiàn)形辨別分析法(LDA)，奇異點(diǎn)值分解法(SVD)，局部特征分析法以及各種基于神經(jīng)網(wǎng)絡(luò )的算法.</p><p>　　面部熱像圖識別的基本原理是這樣的：當熱量通過(guò)面部組織，會(huì )被皮膚發(fā)散，從而使皮下血液系統呈現出一種獨特的面部信號.這種信號可以被紅外照相機獲取，通常就稱(chēng)之為面部熱像圖。相對于人臉識別來(lái)說(shuō)，面部熱像識別很難被假冒。即使是精巧的外科手術(shù)，因為難于對血管重新布線(xiàn)，改變它的結構;并且，獲取面部熱像圖也不依賴(lài)于外部光源。目前面部熱像圖是否具有唯一性和穩定性，還有待進(jìn)一步驗證。</p><p>　　指紋是分布在人體手指表面凸凹不平的紋線(xiàn)。不同指紋的紋線(xiàn)在圖案、斷點(diǎn)和交叉點(diǎn)上各不相同，也就是說(shuō)，指紋是具有唯一性的。依靠這種唯一性，我們就可以把一個(gè)人同他的指紋對應起來(lái)，通過(guò)對他的指紋和預先保存的指紋進(jìn)行比較，就可以驗證他的真實(shí)身份。多年來(lái)，人們對指紋和<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/指紋識別"><em>指紋識別</em></a>做了大量的研究.指紋的唯一性與穩定性已經(jīng)得到了有力的驗證，并在司法、公安和各種安全防護系統廣泛應用。<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/指紋識別"><em>指紋識別</em></a>作為模式識別最先涉足的領(lǐng)域之一，發(fā)展極為迅猛，實(shí)際上在很多場(chǎng)合已經(jīng)成為生物識別技術(shù)的代名詞。</p><p>　　掌形識別是利用手掌的幾何尺寸關(guān)系來(lái)識別人的身份，這些尺寸主要包括手掌的形狀，手指的長(cháng)度和寬度以及手指的三維特征等等。掌形圖像的獲取，可以使用機械或光學(xué)的方法?；谑终频纳矸菡J證系統目前在世界各地有廣泛應用，如1996年亞特蘭大奧運會(huì )和迪斯尼主題公園等.這種識別技術(shù)非常簡(jiǎn)單，并且價(jià)格低廉，可以很方便地嵌入已有應用系統，識別的精度在一定條件下也較為可靠，人們對其也能夠接受。關(guān)于這種技術(shù)，它最大的缺點(diǎn)在于如果用于大人群的身份認證，其識別可靠性會(huì )大大下降，因此，它一般只用于驗證系統。此外掌形識別還有一下的問(wèn)題</p><p>　?、僬菩我脖容^容易被仿冒，系統本身的物理尺寸也較為龐大;</p><p>　?、谡菩蔚姆€定性較差。</p><p>　　手部的血管分布作為一種較穩定的生物特征，可以被用于身份識.通過(guò)紅外照相機，我們可以獲取手部血管的數字化圖像。手部血管的結構很難通過(guò)手術(shù)加以改變，因此別人無(wú)法模仿?；谑植垦茏R別的系統，其精確度基本可以滿(mǎn)足應用要求，并且，一般說(shuō)來(lái)，人們對其也較易接受。這種識別技術(shù)的不足在于，到目前為止，手部血管特征的唯一性還無(wú)法得到可靠的證明。人的虹膜組織結構依賴(lài)于胚胎生長(cháng)發(fā)育的環(huán)境，它對于每個(gè)人來(lái)說(shuō)都是獨一無(wú)二和終生不變的.即使是同一個(gè)人，他的左右眼虹膜也是不一樣的。虹膜不與其它任何外界環(huán)境相關(guān)聯(lián)，也無(wú)法用手術(shù)修補。所有這些特征使虹膜識別成為一種最為安全可靠的認證手段，實(shí)驗表明，其識別精度甚至超過(guò)了DNA.虹膜識別技術(shù)要求的算法復雜度相對來(lái)說(shuō)比較簡(jiǎn)單，但其識別精度卻相當高。當前，制約虹膜識別技術(shù)應用的主要有以下兩個(gè)原因：</p><p>　?、?。虹膜圖像的采集需要用光線(xiàn)掃描人的眼睛，會(huì )使人感到不適;</p><p>　?、?。虹膜掃描器的價(jià)格太高，目前還很難向普通民用市場(chǎng)推廣。視網(wǎng)膜圖形識別與虹膜識別類(lèi)似，有很高的可靠性，但是因為它對人眼有刺激作用，且價(jià)格也一直居高不下，所以沒(méi)有能夠在應用中推廣。</p><p><br /></p><center><img width="500" height="274" src="http://editerupload.eepw.com.cn/201411/211b061cf2ad4b2e7128d9c69c85ed2f.jpg" /></center><p><br /></p><p>　　以上介紹了當今流行的幾種生物識別技術(shù)，表1.2給出了這幾種生物識別技術(shù)的唯一性、穩定性、可采集性、識別精度、防偽性能等參數。從表中我們可以看出，指紋識別技術(shù)從唯一性、穩定性、識別精度、防偽性能等方面均有優(yōu)勢，是一種值得推廣的生物識別技術(shù)。</p></span>  <div class="kgmaacq" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="gmaeubi" class="hAd8"> <br></span>  <div id="ph8zocg" class="quotes"> <span id="mymai5h" class="pre">上一頁(yè)</span> <span id="sszug0w" class="current">1</span> <a href="265699_2.htm">2</a> <a href="265699_2.htm">下一頁(yè)</a> </div>  </div> </article> <div id="lomqqee" class="clear"></div> 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