数字角色指纹验证需要花费大量时间 [英] Digital persona fingerprint verification takes a lot of time

问题描述

我正在使用Digital Persona U.are.U 4000b指纹识别器，我有这个功能验证来自SQL服务器的指纹
 
我的问题是循环，因为它花费大量时间来比较模板。 
 
请给我一些关于如何优化或修改我的代码的建议。

什么我试过了：

受保护的子流程（ByVal样本为DPFP.Sample）
 con =新的SqlConnection 
 
 con.ConnectionString =Data Source = paulv; Initial Catalog = TestDB; Persist Security Info = True; User ID = sa; Password = Passw0rd
 
 Dim command As String = SELECT * FROM Bio_Emplist
 
 Dim da As New SqlDataAdapter（command，con）
 Dim dtb As New DataTable 
 da.Fill（dtb）
 if dtb。 Rows.Count> 0然后
 rowCount = dtb.Rows.Count 
尝试
 For each dr As DataRow in dtb.Rows 
 Dim fpt As Byte（）= CType（dr（Fpt）） ，Byte（））
 
 Dim ms As New MemoryStream（fpt）
 Dim tmpObj As DPFP.Template = New DPFP.Template 
 Dim verify As DPFP.Verification.Verification = New DPFP.Verification.Verification 
 
 Template = tmpObj 
 tmpObj.DeSerialize（fpt）
 
 DrawPicture（ConvertSampleToBitmap（Sample））
 
 Dim功能作为DPFP.FeatureSet = ExtractFeatures（Sample，DPFP.Processing.DataPurpose.Verification）
'检查样本的质量并开始验证，如果它是好的
如果不是功能什么都没有那么
'比较使用我们的模板设置的功能
 Dim result As DPFP.Verification.Verification.Result = New DPF P.Verification.Verification.Result（）
 verify.Verify（features，Template，result）
'UpdateStatus（result.FARAchieved）
 
如果result.Verified那么
 MakeReport（指纹已经过验证。）
 
 empID = dr（EmpID）
 empFName = dr（FName）
 empLName = dr（LName） ）
 SetVerifyText（empID，empFName，empLName）
退出试试
否则
 FailedVerifyText（）
如果rowCount = 1则
 MakeReport（指纹是未经验证。）
否则
 rowCount = rowCount  -  1 
 MakeReport（查找匹配...）
结束如果
结束如果
结束如果
下一个
 Catch ex As Exception 
 MsgBox（ex.ToString）
结束尝试
结束如果
结束子
 

解决方案

创建一个获取Fmds的函数。

私人fingerList作为新列表（Fmd）

检查：

https：// www。 codeproject.com/Questions/1250431/How-can-I-save-and-retrieve-a-fingerprint-template

I'm using Digital Persona U.are.U 4000b fingerprint reader and I have this function that verifies the fingerprint from SQL server

My problem is the loop because it takes a lot of time to compare the templates.

Please give me some advice on how can I optimize or revise my code.

What I have tried:

Protected Sub Process(ByVal Sample As DPFP.Sample)
    con = New SqlConnection

    con.ConnectionString = "Data Source=paulv;Initial Catalog=TestDB;Persist Security Info=True;User ID=sa;Password=Passw0rd"

    Dim command As String = "SELECT * FROM Bio_Emplist"

    Dim da As New SqlDataAdapter(command, con)
    Dim dtb As New DataTable
    da.Fill(dtb)
    If dtb.Rows.Count > 0 Then
        rowCount = dtb.Rows.Count
        Try
            For Each dr As DataRow In dtb.Rows
                Dim fpt As Byte() = CType(dr("Fpt"), Byte())

                Dim ms As New MemoryStream(fpt)
                Dim tmpObj As DPFP.Template = New DPFP.Template
                Dim verify As DPFP.Verification.Verification = New DPFP.Verification.Verification

                Template = tmpObj
                tmpObj.DeSerialize(fpt)

                DrawPicture(ConvertSampleToBitmap(Sample))

                Dim features As DPFP.FeatureSet = ExtractFeatures(Sample, DPFP.Processing.DataPurpose.Verification)
                ' Check quality of the sample and start verification if it's good
                If Not features Is Nothing Then
                    ' Compare the feature set with our template
                    Dim result As DPFP.Verification.Verification.Result = New DPFP.Verification.Verification.Result()
                    verify.Verify(features, Template, result)
                    'UpdateStatus(result.FARAchieved)

                    If result.Verified Then
                        MakeReport("The fingerprint was VERIFIED.")

                        empID = dr("EmpID")
                        empFName = dr("FName")
                        empLName = dr("LName")
                        SetVerifyText(empID, empFName, empLName)
                        Exit Try
                    Else
                        FailedVerifyText()
                        If rowCount = 1 Then
                            MakeReport("The fingerprint was NOT VERIFIED.")
                        Else
                            rowCount = rowCount - 1
                            MakeReport("Finding Match...")
                        End If
                    End If
                End If
            Next
        Catch ex As Exception
            MsgBox(ex.ToString)
        End Try
    End If
End Sub

解决方案

Create a Function for getting the Fmds.

Private fingerList As New List(Of Fmd)

Check This :
https://www.codeproject.com/Questions/1250431/How-can-I-save-and-retrieve-a-fingerprint-template

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