外文翻譯--新型指紋識別傳感器的應(yīng)用分析-其他專業(yè)-預(yù)覽頁
【正文】 ap is 50 microns, the electric capacity picture element array resolution is higher than 500dpi slightly. This kind of sensor based on one kind of standard list polycrystalline silicon three metals CMOS craft, and uses microns craft to carry on the design. The metal interlocks the third constitution electric capacity picture element level, is made and is covering nitrided silicon by the titanium nitrides, thickness is only 7,000 Emmy. This kind of rigid metal electrode with anti rubs extremely solid spreads the sensor which the coating bination forms to be durable, the service life may amount to very many years. examination Humanity39。 The registration authentication procedure hits the mark from a fingerprint 30~40 characteristic withdraws seven characteristics matches spot to carry on the confirmation at least, including constitutes some fingerprint detail the trace bifurcation and the end point, and is defined the characteristic point the distance. When carries on the registration, the information code is saved, will take the next user authentication the reference template. When the user enters the system, he/She has delimited the finger the sensor region, gains the scene scanning template and the reference template carry on the parison. The entire process pletes in 1 or 2 seconds. Through the parison, the system can determine whether this scene scanning template has contained the enough biological data which tallies with the reference template, and judgment two whether do match. If does not match, then the authentication defeat, waited for the next time will distinguish. This kind of fingerprint examination system performance is very high, makes the wrong judgment to the effective fingerprint the probability to be smaller than 1%, but invalid fingerprint for effective fingerprint possibility then does not exist nearly, its probability is lower than %. 新型指紋識別傳感器的應(yīng)用分析 摘 要 指紋識別技術(shù)作為一種先進的身份識別方法，已經(jīng)被廣泛使用于各行各業(yè)中。 目前市場上有兩種固態(tài)指紋傳感器：第一種是單次觸摸型傳感器，要求手指在指紋采集區(qū)進行可靠的觸摸；第二種則需要用手指在傳感器表面擦過，傳感器會采集一套特定的數(shù)據(jù)，然后進行快速分析和認證。這類傳感器基于一種標準的單 多晶硅三層金屬 CMOS工藝，并采用 微米工藝進行設(shè)計。每個像素先預(yù)充電到某一參考電壓，然后由 參考電流放電。這種軟件采集原始的指紋圖像，將圖像信息數(shù)字化并提取其中的細節(jié)模板，然后進行測試，確定提取的細節(jié)模板是否與參考模板吻合 。 目前這些傳感器已完成設(shè)計，并用于美國政府機構(gòu)及警察局進行指紋識別。在器件表面有一層鈍化層，作為兩個電容極間的電介質(zhì)層。這些器件主要用于移動設(shè)備的嵌入式安全識別應(yīng)用，如手機和 PDA。此人則將其右手的第一、二或第三個手指置于一個與無線 PDA 相連的傳感器上，可以迅速將嫌疑人與以前的犯罪記錄進行對比確認。如果連續(xù)幾次認證無法通過，則手機會刪除存儲器中的關(guān)鍵信息然后關(guān)機。注冊過程十分簡單：每個授權(quán)駕駛的成員將其手指置于傳感器上，并將汽車的各種參數(shù)按個人愛好進行設(shè)置，然后將這些設(shè)置存入車載的電腦存儲器中。當指紋匹配成功時，汽車便按已編程設(shè)定的內(nèi)部參數(shù)來控制后視鏡、汽車座椅、無線基站以及車內(nèi)空氣環(huán)境。原來執(zhí)法機構(gòu)使用的指紋識別方式僅存儲指紋上一些特定點的數(shù)據(jù)而非整個影像，因而相比之下，生物指紋掃描系統(tǒng)更為有效、可靠。整個過程在1 或 2 秒內(nèi)完成。
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