【正文】 ...................................................................19 8參考文獻(xiàn) ................................................................................................20 3 基于單片機(jī)的指紋識別系統(tǒng)設(shè)計 摘 要 隨著 時代的發(fā)展，社會越來越需要高效、可靠的身份識別系統(tǒng)。 指紋識別技術(shù)是眾多生物識別技術(shù)中的一種，相對于其它身份認(rèn)證技術(shù)，自動指紋識別是一種更為理想的身份確認(rèn)技術(shù)，用自動指紋識別不僅具有許多獨(dú)到的信息安全優(yōu)點(diǎn)，更重要的是還具有很高的實(shí)用性、可行性。從那時起，自動指紋識別系統(tǒng) AFIS (Automated Fingerprint Identification System)在法律實(shí)施方面的研究和應(yīng)用在世界許多國家展開。指紋采集原理主要是根據(jù)指紋的幾何特性或生理特性，通過各種傳感技術(shù)把指紋表現(xiàn)出來，形成數(shù)字化表示的指紋圖案。不論是特征點(diǎn)的單體特征，還是特征點(diǎn)的組合特征都是指紋特征的組成部分。近幾年來，它逐漸走向市場更為廣泛的民用市場。經(jīng)專家預(yù)計，指紋產(chǎn)品將是未來 IT 產(chǎn)業(yè)新的增長點(diǎn)：利潤率最高、發(fā)展?jié)摿ψ畲?。主要功能就是用液晶顯示出指紋模塊采集指紋圖像 各個流程及比對的結(jié)果 .采集指紋圖像之前，指紋模塊必須要檢測手指是否放在采集窗口上，所以就要有錄入指紋這一項(xiàng)功能。通過查閱大量的文獻(xiàn)資料、綜合分析考慮 。 三角點(diǎn)位于從核心點(diǎn)開始的第一個分叉點(diǎn)或者斷點(diǎn)，或者兩條紋路會聚處、孤立點(diǎn)、折轉(zhuǎn)處，或者指向這些奇異點(diǎn)。特征點(diǎn)的參數(shù)包括：方向（節(jié)點(diǎn)可以朝著一定的方向）、曲率（描述紋路方向改變的速度）、位置（節(jié)點(diǎn)的位置通過 x/y 坐標(biāo)來描述，可以是絕對的，也可以是相對于三角點(diǎn)或特征點(diǎn)的）。 8051 串行通訊的方式選擇、接受和發(fā)送控制以及串行口的狀態(tài) 12 標(biāo)志等均由特殊功能寄存器完成。它通過與之相配套的指紋傳感器，可構(gòu)成一個獨(dú)立的指紋識別系統(tǒng)，或作為一個完整的外部設(shè)備。 指紋 圖像獲?。和ㄟ^專門的指紋采集儀可以采集活體指紋圖像。 紋型是指紋的基本分類，是按中心花紋和三角的基本形態(tài)劃分的。 硬件特性： 80C51 單片機(jī)是在 8051 的基礎(chǔ)上發(fā)展起來的， 8051單片機(jī)與 80C51 單片機(jī)從 外形看是完全一樣的，其指令系統(tǒng)、引腳信號、總線等完全一致（完全兼容），主要差別就在于芯片的制造工藝上。輸入電壓 iV 的選擇依據(jù)是： m ax 0 2iiV V V V? ? ? 式中： maxiV —— 穩(wěn)壓塊允許的最大輸入電壓； 0V —— 穩(wěn)壓塊的輸出電壓； 2V—— 穩(wěn)壓塊輸入與輸出之間的最小壓差。 根據(jù)設(shè)計要求，本設(shè)計已經(jīng)基本完成題目要求但還存在不足之處。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept i. If you are worried about how the time limits apply to you, take advice from one of the anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. 21 Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。s governing body, has also ordered an immediate investigation into the referee39。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。想要的，不想要的，界限明確，好像沒有什么可以撼動自己。t start planning... Those years, those days of do, finally, like youth, will end in our life. 此刻，天空是陰暗的，空氣里有著剛下過雨之后的清新因子。 Baumgartner the disappointing news: Mission aborted. r plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( 23 miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. The supersonic descent could happen as early as Sunda. The weatheThe balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform. Below, the Earth bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he39。嫌惡過自己的怯懦，最終卻發(fā)現(xiàn)有很多 緣分 ，有很多 錯過，好像冥冥之中真的已經(jīng)注定。 Then in high school, think don39。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA.