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document.write("<script src='http://www.ex-cimer.com/news/addviewcount/articleid/265699/typeid/5?source="+source+"'><\/script>"); </script> <div class="szuarum" id="path" style="position:relative;">  <div id="rrxdjml" class="hLogoLocationSearch"> <div id="mmojldg" class="cT"> <h2>新聞中心</h2> </div> <div id="biojpzv" class="hLocation"> <p><a href="http://www.ex-cimer.com" target="_blank">EEPW首頁(yè)</a> > <a href="/info/industry/special/safety">安全與國(guó)防</a> > <a href="/info/articlelist/special/safety/type/5">設(shè)計(jì)應(yīng)用</a> > 指紋識(shí)別中的圖像處理研究------背景與基礎(chǔ)名詞解釋?zhuān)ǘ?/p> </div> </div> </div>   <script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="dsflzyb" id="container"> <section> <article> <h1>指紋識(shí)別中的圖像處理研究------背景與基礎(chǔ)名詞解釋?zhuān)ǘ?/h1> <div id="mmoflky" 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 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style="margin-top:28px;"></div> <div id="hsjxahr" class="content" id="contentDiv" style="position:relative;"> <div id="ddcxsnm" 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>　　1.4<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/指紋識(shí)別"><em>指紋識(shí)別</em></a>技術(shù)</strong></p>本文引用地址：<a href="http://www.ex-cimer.com/article/265699.htm">http://www.ex-cimer.com/article/265699.htm</a><p>　　在本文中，我們的目標(biāo)是使用<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/指紋識(shí)別"><em>指紋識(shí)別</em></a>技術(shù)設(shè)計(jì)一種自動(dòng)的個(gè)人身份認(rèn)證系統(tǒng)。之所以采用指紋，從上面的比較可知，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/指紋識(shí)別"><em>指紋識(shí)別</em></a>技術(shù)具有以下的優(yōu)點(diǎn)：</p><p>　　(1)每個(gè)人的指紋都具有唯一性和穩(wěn)定性，不會(huì)隨年齡的增長(zhǎng)和身體健康狀況的變化而變化。</p><p>　　(2)指紋識(shí)別的有效性已經(jīng)得到了廣泛的證明和認(rèn)可。</p><p>　　(3)指紋取樣設(shè)備種類(lèi)繁多，并且價(jià)格低廉，另外，已有標(biāo)準(zhǔn)的指紋樣本庫(kù)，便于識(shí)別系統(tǒng)的軟件開(kāi)發(fā)。</p><p>　　(4)一個(gè)人的十指指紋皆不相同，這樣，可以不增加系統(tǒng)的設(shè)計(jì)負(fù)擔(dān)的情況下方便地利用多個(gè)指紋構(gòu)成多重口令，提高系統(tǒng)的安全性。</p><p>　　(5)指紋識(shí)別中使用的模板并非最初的指紋圖像，而是由指紋圖像中提取的細(xì)節(jié)特征構(gòu)成，這樣使系統(tǒng)對(duì)指紋模板庫(kù)的存儲(chǔ)要求減小。另外，特征模板也大大減少了網(wǎng)絡(luò)傳輸?shù)呢?fù)擔(dān)，便于通過(guò)指紋實(shí)現(xiàn)異地身份確認(rèn)和網(wǎng)絡(luò)數(shù)字簽名。</p><p><br /></p><center><img width="500" height="368" src="http://editerupload.eepw.com.cn/201411/cc7b201d2ca6fb41034037e4826512c5.jpg" /></center><p><br /></p><p>　　由于指紋識(shí)別技術(shù)有上述的優(yōu)點(diǎn)，在司法部門(mén)的需求下產(chǎn)生了基于指紋識(shí)別技術(shù)的自動(dòng)指紋識(shí)別系統(tǒng)(AFIS)。圖1.4是一個(gè)自動(dòng)指紋識(shí)別的應(yīng)用原理框圖。</p><p>　　從圖中我們可以看出，一個(gè)自動(dòng)指紋識(shí)別應(yīng)用系統(tǒng)需要解決至少三個(gè)關(guān)鍵性的問(wèn)題，他們分別是指紋圖像的采集、指紋圖像的處理、指紋匹配。</p><p>　　近幾年，隨著電子集成技術(shù)的發(fā)展，出現(xiàn)了可以直接獲取<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/數(shù)字圖像"><em>數(shù)字圖像</em></a>的活體指紋傳感器，一些體積小、操作方便的活體指紋圖像傳感器已經(jīng)廣泛應(yīng)用，這些活體指紋傳感器采用的技術(shù)有：</p><p>　　①。光學(xué)衰減全內(nèi)反射(FTIR)，</p><p>　　②。超聲波反射，</p><p>　?、邸Ｈz像，</p><p>　　④。熱敏傳感技術(shù)，</p><p>　?、荨ｋ娙莼蛏疃入妶?chǎng)技術(shù)。除了采用上述的活體采集技術(shù)外，這些傳感器還都采用了自動(dòng)增益控制技術(shù)，可以通過(guò)軟件調(diào)整的方法來(lái)獲取不同質(zhì)量的數(shù)字指紋圖像。例如，Veridicom公司的FPS200電容式指紋傳感器，在指紋采集過(guò)程中，根據(jù)反饋信息調(diào)節(jié)電容放電時(shí)間、和電荷耦合時(shí)間等參數(shù)可以增強(qiáng)其靈敏度，使圖像不清晰(對(duì)比度差)的區(qū)域也能夠被檢測(cè)到(如：手指壓得較輕的地方)，并在捕捉的瞬間為這些象素提高靈敏度。同時(shí)，還可根據(jù)指紋圖像的面積、灰度極差等特性來(lái)控制捕捉效果最佳的圖像。</p><p>　　指紋圖像的處理技術(shù)是指紋自動(dòng)識(shí)別系統(tǒng)中的關(guān)鍵技術(shù)，指紋圖像處理算法的好壞直接決定了指紋自動(dòng)識(shí)別系統(tǒng)的可靠性和速度等參數(shù)。目前在指紋圖像處理領(lǐng)域關(guān)鍵的技術(shù)有方向圖分割算法、細(xì)化算法、指紋圖像增強(qiáng)算法、指紋圖像有效區(qū)域提取算法等。由于，每種算法都有其優(yōu)點(diǎn)和缺點(diǎn)，因此，到目前為止在文獻(xiàn)中還沒(méi)有出現(xiàn)過(guò)各個(gè)方面都非常出色的指紋圖像處理算法，本文的重點(diǎn)也是研究這些經(jīng)常出現(xiàn)的圖像處理算法，并提出根據(jù)指紋圖像的特性，提出自己的圖像處理算法。</p><p>　　指紋匹配主要依靠的是指紋細(xì)節(jié)特征(Minutiae)。常見(jiàn)的指紋細(xì)節(jié)特征主要有以下五種：端點(diǎn)、分歧點(diǎn)、橋形、交叉和眼形，這些特征在指紋中的分布并不均勻，它們的比例大約為：68.2%、23.8%、3.7%、3.2%和1.1%。而根據(jù)FBI的建議，自動(dòng)指紋識(shí)別系統(tǒng)一般只用脊線(xiàn)的端點(diǎn)和分歧點(diǎn)作為指紋的細(xì)節(jié)特征，這是因?yàn)槠渌麕追N特征都可以看作是這兩種特征的合成。</p><p><br /></p><center><img width="366" height="260" src="http://editerupload.eepw.com.cn/201411/860abfe7c1d15beebabf99d14dc1d14a.jpg" /></center><p><br /></p><p>　　圖1.5為這兩種特征的示例。脊線(xiàn)的端點(diǎn)是脊線(xiàn)結(jié)束的位置，分歧點(diǎn)是脊線(xiàn)分岔的位置。據(jù)統(tǒng)計(jì)一般一枚完整的指紋有大約60-80個(gè)細(xì)節(jié)特征。無(wú)論是人工匹配還是機(jī)器匹配，指紋比對(duì)的過(guò)程一般可分為以下兩步：</p><p>　　(1)根據(jù)確定的參考點(diǎn)校正兩幅指紋圖像，并搜索兩幅圖像的細(xì)節(jié)特征;</p><p>　　(2)根據(jù)匹配上的細(xì)節(jié)點(diǎn)對(duì)來(lái)確定兩幅圖像是否來(lái)自同一指紋。</p><p>　　目前常用的自動(dòng)指紋識(shí)別系統(tǒng)，基本上都采用細(xì)節(jié)匹配的方法。基于細(xì)節(jié)點(diǎn)的匹配有多種算法：Stockman等提出的基于Hough變換的方法把點(diǎn)模式匹配轉(zhuǎn)化成了對(duì)轉(zhuǎn)換參數(shù)的Hough空間中峰值的檢測(cè)，J.P.Starink與E.Backer從能量最小化的角度描述點(diǎn)匹配問(wèn)題，并使用模擬退火的方法，Rand研究所的Ratkovic提出了更細(xì)致的指紋特征模型。該模型區(qū)分十種不同的指紋特征。在此基礎(chǔ)上，J.H.Liu等用在指紋上疊加?xùn)鸥癫?duì)特征的分布編碼的方法來(lái)識(shí)別特征。Sparrows 與A.K.Hrechak 等都提出了基于結(jié)構(gòu)特征信息的指紋特征匹配，而D.K.Isenor與S.G.Zaky使用圖來(lái)表示指紋特征，并用圖匹配的方法來(lái)匹配指紋圖。S.Sobajic等描述了一種利用神經(jīng)網(wǎng)絡(luò)來(lái)進(jìn)行細(xì)節(jié)點(diǎn)匹配的算法。這些算法對(duì)于油墨方式獲取的指紋圖像，其匹配精度較高，基本上達(dá)到在0.0001%FAR的情況下，F(xiàn)RR低于10%，但對(duì)于晶體指紋傳感器獲取的圖像，因其重疊部分較少，其匹配效果就不能令人滿(mǎn)意了。</p><p><strong>　　1.5本文的任務(wù)</strong></p><p>　　由于傳統(tǒng)的安全技術(shù)面臨高科技的挑戰(zhàn)，其安全性已經(jīng)不能夠滿(mǎn)足需要，因此人們轉(zhuǎn)向<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/生物識(shí)別"><em>生物識(shí)別</em></a>技術(shù)的研究，指紋識(shí)別技術(shù)與其它幾種<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/生物識(shí)別"><em>生物識(shí)別</em></a>技術(shù)相比有一定的優(yōu)勢(shì)，因此成為人們研究的熱點(diǎn)，但是到現(xiàn)今為止，還沒(méi)有一種統(tǒng)一有效的指紋圖像處理、識(shí)別的標(biāo)準(zhǔn)算法，多數(shù)的公司也都是根據(jù)不同的應(yīng)用目的，來(lái)研究一些實(shí)用的工程應(yīng)用算法。本文針對(duì)Veridicom公司的FPS200指紋傳感器，試圖設(shè)計(jì)一種較好的指紋圖像處理算法和自動(dòng)指紋識(shí)別算法，該算法面向一般小型數(shù)據(jù)庫(kù)民用系統(tǒng)，其目標(biāo)是針對(duì)200枚左右的指紋數(shù)據(jù)庫(kù)，該算法的期望的結(jié)果是誤識(shí)率達(dá)到1*10-6，拒識(shí)率小于10%，對(duì)100枚指紋數(shù)據(jù)庫(kù)的1：N比對(duì)時(shí)間小于3秒鐘。要達(dá)到上述的目標(biāo)，需要解決3個(gè)主要的問(wèn)題：指紋圖像預(yù)處理，指紋圖像的后處理，指紋識(shí)別技術(shù)的應(yīng)用。本文旨在對(duì)指紋圖像的預(yù)處理和后處理算法進(jìn)行研究，以期尋求適應(yīng)于小型民用領(lǐng)域的指紋識(shí)別系統(tǒng)的圖像處理算法。</p></span>  <div class="rjpgxph" 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"> 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href="http://www.ex-cimer.com/tech/s/k/開(kāi)關(guān)電源" title="開(kāi)關(guān)電源" target="_blank">開(kāi)關(guān)電源</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/單片機(jī)" title="單片機(jī)" target="_blank">單片機(jī)</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/PCB" title="PCB" target="_blank">PCB</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/USB" title="USB" target="_blank">USB</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/ARM" title="ARM" target="_blank">ARM</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/CPLD" title="CPLD" target="_blank">CPLD</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/連接器" title="連接器" target="_blank">連接器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/MEMS" title="MEMS" target="_blank">MEMS</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/CMOS" title="CMOS" target="_blank">CMOS</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/MIPS" title="MIPS" target="_blank">MIPS</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/EMC" title="EMC" target="_blank">EMC</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/EDA" title="EDA" target="_blank">EDA</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/ROM" title="ROM" target="_blank">ROM</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/陀螺儀" title="陀螺儀" target="_blank">陀螺儀</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/VHDL" title="VHDL" target="_blank">VHDL</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/比較器" title="比較器" target="_blank">比較器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/Verilog" title="Verilog" target="_blank">Verilog</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/穩(wěn)壓電源" title="穩(wěn)壓電源" target="_blank">穩(wěn)壓電源</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/RAM" title="RAM" target="_blank">RAM</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/AVR" title="AVR" target="_blank">AVR</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/傳感器" title="傳感器" target="_blank">傳感器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/可控硅" title="可控硅" target="_blank">可控硅</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/IGBT" title="IGBT" target="_blank">IGBT</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/嵌入式開(kāi)發(fā)" title="嵌入式開(kāi)發(fā)" target="_blank">嵌入式開(kāi)發(fā)</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/逆變器" title="逆變器" target="_blank">逆變器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/Quartus" title="Quartus" target="_blank">Quartus</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/RS-232" title="RS-232" target="_blank">RS-232</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/Cyclone" title="Cyclone" target="_blank">Cyclone</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/電位器" title="電位器" target="_blank">電位器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/電機(jī)控制" title="電機(jī)控制" target="_blank">電機(jī)控制</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/藍(lán)牙" title="藍(lán)牙" target="_blank">藍(lán)牙</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/PLC" title="PLC" target="_blank">PLC</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/PWM" title="PWM" target="_blank">PWM</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/汽車(chē)電子" title="汽車(chē)電子" target="_blank">汽車(chē)電子</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/轉(zhuǎn)換器" title="轉(zhuǎn)換器" target="_blank">轉(zhuǎn)換器</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/電源管理" title="電源管理" target="_blank">電源管理</a></li> <li><a href="http://www.ex-cimer.com/tech/s/k/信號(hào)放大器" title="信號(hào)放大器" target="_blank">信號(hào)放大器</a></li> </ul> </div>  </div>  <script> //先得到cookie function getCookie(cookie_name) { var allcookies = document.cookie; var cookie_pos = allcookies.indexOf(cookie_name); // 如果找到了索引，就代表cookie存在，反之，就說(shuō)明不存在。 if (cookie_pos != -1) { // 把cookie_pos放在值的開(kāi)始，只要給值加1即可。 cookie_pos += 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