重庆网站建设公司,推广平台方案,专业做数据的网站有哪些,网站建设一屏式网站版权声明#xff1a;本文为博主原创文章#xff0c;转载请在显著位置标明本文出处以及作者网名#xff0c;未经作者允许不得用于商业目的。 EmguCV是一个基于OpenCV的开源免费的跨平台计算机视觉库,它向C#和VB.NET开发者提供了OpenCV库的大部分功能。
教程VB.net版本请访问…
版权声明本文为博主原创文章转载请在显著位置标明本文出处以及作者网名未经作者允许不得用于商业目的。 EmguCV是一个基于OpenCV的开源免费的跨平台计算机视觉库,它向C#和VB.NET开发者提供了OpenCV库的大部分功能。
教程VB.net版本请访问EmguCV学习笔记 VB.Net 目录-CSDN博客
教程C#版本请访问EmguCV学习笔记 C# 目录-CSDN博客
笔者的博客网址https://blog.csdn.net/uruseibest
教程配套文件及相关说明以及如何获得pdf教程和代码请移步EmguCV学习笔记
学习VB.Net知识请移步 vb.net 教程 目录_vb中如何用datagridview-CSDN博客 学习C#知识请移步C# 教程 目录_c#教程目录-CSDN博客 11.9 姿势识别 OpenPose
OpenPose模型是一种用于人体姿态估计的深度学习模型它能够检测出包括眼睛、鼻子、手臂、腿等18个人体的关键点并估计它们的坐标位置和置信度。
0Nose鼻子、1neck脖子、2rshoulder右肩、3relbow右肘部、4rwrist右手腕、5shoulder左肩、6lelbow左肘部、7lwrist左手腕、8rhip右臀部、9rknee右膝盖、10rankle右脚踝、11lhip左臀部、12lknee左膝盖、13lankle左脚踝、14reye右眼、15leye左眼、16rear右耳、17lear左耳、18background背景主要是作为下一步扩展使用在实际中不处理
在使用OpenPose模型时通常需要将输入图像作为模型的输入经过处理后得到一个四维数组作为输出结果。这个四维数组其维度为(N, P, H, W)
各个维度的含义
N在输入图像中检测到的人体数量。P估计的关键点数包括了人体的身体部位和手指关节等只需要取前18个。H关键点的坐标信息在输出结果中的高度在实际使用中就是DnnInvoke.BlobFromImage中size参数设置输出的Height如果最终输出到源图像那么应该按照比例进行还原。W关键点的坐标信息在输出结果中的宽度在实际使用中就是DnnInvoke.BlobFromImage中size参数设置输出的Width如果最终输出到源图像那么应该按照比例进行还原。
具体到某个元素的值就是该点是人体关键点的置信度例如0,2,10,30返回0,2,height,width中的最大值为0.759那么可以认为坐标(10,30)是右肩的可能性为75.9%。
从上面可以看出在这个四维数组中每个元素包含了x坐标维度W、y坐标维度H和置信度三个值。因此可以通过遍历该四维数组并解析每个元素来获取所有关键点的坐标信息和置信度从而进行人体姿态估计的后续处理。
【代码位置frmChapter11】Button10_Click、getMaxPoint 关键点信息 Structure Keypoint Dim conf As Single 置信度 Dim p As Point 关键点坐标 End Structure 使用openpose显示人体关键点 Private Sub Button10_Click(sender As Object, e As EventArgs) Handles Button10.Click 人体关键点 Dim body_Keypoint() As String {nose, neck, rshoulder, relbow, rwrist, lshoulder, lelbow, lwrist, rhip, rknee, rankle, lhip, lknee, lankle, reye, leye, rear, lear, background} Dim m As New Mat(C:\learnEmgucv\action.jpg, ImreadModes.Color) Dim net As Dnn.Net DnnInvoke.ReadNetFromTensorflow(C:\learnEmgucv\openpose\graph_opt.pb) Dim blob As Mat DnnInvoke.BlobFromImage(m, 1.0, New Drawing.Size(360, 360), New MCvScalar(127.5, 127.5, 127.5), False, False) net.SetInput(blob) Dim mout As Mat net.Forward() 返回四维数组 Dim fout(,,,) As Single fout mout.GetData() Dim H As Integer fout.GetLength(2) Dim W As Integer fout.GetLength(3) Dim lkeypoint As New List(Of Keypoint) 获得关键点信息 lkeypoint getMaxPoint(fout) Dim x, y As Single For i As Integer 0 To lkeypoint.Count - 1 按照比例获得关键点在源图像中的坐标 x (lkeypoint(i).p.X / W) * m.Width y (lkeypoint(i).p.Y / H) * m.Height 调试时输出信息 Console.WriteLine(body_Keypoint(i) lkeypoint(i).conf lkeypointi).p.X - lkeypoint(i).p.Y) 置信度超过某个值才能认为是正确的结果 If lkeypoint(i).conf 0.1 Then CvInvoke.Circle(m, New Point(x, y), 4, New MCvScalar(255, 0, 0), -1) End If Next CvInvoke.Imshow(m, m) End Sub 获得人体18个关键点列表这里考虑只有一个人体的情况 Private Function getMaxPoint(ByVal inputarray(,,,) As Single) As List(Of Keypoint) Dim lkeypoint As New List(Of Keypoint) Dim peoplecount As Integer 1 考虑只有一个人体的情况如果多个人体请使用 inputarray.GetLength(0) Dim modecount As Integer 18 只考虑18个人体关键点 inputarray.GetLength(1) Dim dim3 As Integer inputarray.GetLength(2) 图像高度 Dim dim4 As Integer inputarray.GetLength(3) 图像宽度 循环检测到的人体个数 For i As Integer 0 To peoplecount - 1 循环检测到的人体关键点 For j As Integer 0 To modecount - 1 Dim maxvalue As Single 0 Dim maxX As Integer 0 Dim maxY As Integer 0 循环图像高度即对应Y坐标 For k As Integer 0 To dim3 - 1 循环图像宽度即对应X坐标 For l As Integer 0 To dim4 - 1 获得置信度最大的值并获得其坐标 If maxvalue inputarray(i, j, k, l) Then maxvalue inputarray(i, j, k, l) maxX l maxY k End If Next Next 添加到关键点列表 Dim kp As New Keypoint kp.conf maxvalue kp.p New Point(maxX, maxY) lkeypoint.Add(kp) Next Next Return lkeypoint
End Function
输出结果如下图所示
图11-9 获得人体关键点
下面的代码通过人体关键点的关联建立关键点的连线。
【代码位置frmChapter11】Button11_Click、PointFToPoint 关键点关联 Structure Relation 开始关键点 Dim startpoint As Integer 结束关键点 Dim endpoint As Integer Sub New(ByVal startpoint As Integer, ByVal endpoint As Integer) Me.startpoint startpoint Me.endpoint endpoint End Sub End Structure 获得人体关键点并将关键点关联起来 Private Sub Button11_Click(sender As Object, e As EventArgs) Handles Button11.Click Dim body_Keypoint() As String {nose, neck, rshoulder, relbow, rwrist, lshoulder, lelbow, lwrist, rhip, rknee, rankle, lhip, lknee, lankle, reye, leye, rear, lear, background} 18个关键点关联 Dim body_Relations As New List(Of Relation) body_Relations.Add(New Relation(16, 14)) body_Relations.Add(New Relation(14, 0)) body_Relations.Add(New Relation(17, 15)) body_Relations.Add(New Relation(15, 0)) body_Relations.Add(New Relation(0, 1)) body_Relations.Add(New Relation(1, 2)) body_Relations.Add(New Relation(2, 3)) body_Relations.Add(New Relation(3, 4)) body_Relations.Add(New Relation(1, 5)) body_Relations.Add(New Relation(5, 6)) body_Relations.Add(New Relation(6, 7)) body_Relations.Add(New Relation(1, 8)) body_Relations.Add(New Relation(8, 9)) body_Relations.Add(New Relation(9, 10)) body_Relations.Add(New Relation(1, 11)) body_Relations.Add(New Relation(11, 12)) body_Relations.Add(New Relation(12, 13)) Dim m As New Mat(C:\learnEmgucv\action.jpg, ImreadModes.Color) Dim net As Dnn.Net net DnnInvoke.ReadNetFromTensorflow(C:\learnEmgucv\openpose\graph_opt.pb) Dim blob As Mat blob DnnInvoke.BlobFromImage(m, 1.0, New Drawing.Size(360, 360), New MCvScalar(127.5, 127.5, 127.5), False, False) net.SetInput(blob) Dim mout As New Mat mout net.Forward() Dim fout(,,,) As Single fout mout.GetData() Dim H As Integer fout.GetLength(2) Dim W As Integer fout.GetLength(3) Dim lkeypoint As New List(Of Keypoint) lkeypoint getMaxPoint(fout) Dim x, y As Single For i As Integer 0 To lkeypoint.Count - 1 按照比例获得关键点在源图像中的坐标 x (lkeypoint(i).p.X / W) * m.Width y (lkeypoint(i).p.Y / H) * m.Height 置信度超过某个值才能认为是正确的结果 If lkeypoint(i).conf 0.1 Then CvInvoke.Circle(m, New Point(x, y), 5, New MCvScalar(255, 0, 0), -1) End If Next Dim startpoint As PointF Dim startpointx, startpointy As Single Dim endpoint As PointF Dim endpointx, endpointy As Single For Each body_Relation As Relation In body_Relations startpointx (lkeypoint(body_Relation.startpoint).p.X / W) * m.Width startpointy (lkeypoint(body_Relation.startpoint).p.Y / H) * m.Height startpoint New PointF(startpointx, startpointy) endpointx (lkeypoint(body_Relation.endpoint).p.X / W) * m.Width endpointy (lkeypoint(body_Relation.endpoint).p.Y / H) * m.Height endpoint New PointF(endpointx, endpointy) 关键点置信度是否符合要求 If lkeypoint(body_Relation.startpoint).conf 0.1 And lkeypoint(body_Relation.endpoint).conf 0.1 Then 关键点建立连线 CvInvoke.Line(m, PointFToPoint(startpoint), PointFToPoint(endpoint), New MCvScalar(0, 255, 0), 3) End If Next CvInvoke.Imshow(m, m) End Sub 将PointF转Point方法 Public Shared Function PointFToPoint(ByVal pf As PointF) As Point Return New Point(CInt(pf.X), CInt(pf.Y))
End Function
输出结果如下图所示
图11-10 人体关键点连线 下面代码是在上面代码基础上实现在视频中显示人体关键点的连线。
【代码位置frmChapter11】Button12_Click、vc_ImageGrabbed Dim vc As VideoCapture Dim body_Relations As New List(Of Relation) 将视频人物标注人体关键点和关键点连线 Private Sub Button12_Click(sender As Object, e As EventArgs) Handles Button12.Click 18个关键点关联 body_Relations New List(Of Relation) body_Relations.Add(New Relation(16, 14)) body_Relations.Add(New Relation(14, 0)) body_Relations.Add(New Relation(17, 15)) body_Relations.Add(New Relation(15, 0)) body_Relations.Add(New Relation(0, 1)) body_Relations.Add(New Relation(1, 2)) body_Relations.Add(New Relation(2, 3)) body_Relations.Add(New Relation(3, 4)) body_Relations.Add(New Relation(1, 5)) body_Relations.Add(New Relation(5, 6)) body_Relations.Add(New Relation(6, 7)) body_Relations.Add(New Relation(1, 8)) body_Relations.Add(New Relation(8, 9)) body_Relations.Add(New Relation(9, 10)) body_Relations.Add(New Relation(1, 11)) body_Relations.Add(New Relation(11, 12)) body_Relations.Add(New Relation(12, 13)) vc New VideoCapture(C:\learnEmgucv\action.mp4) If vc.IsOpened False Then MessageBox.Show(打开文件失败) Exit Sub End If 添加ImageGrabbed事件 AddHandler vc.ImageGrabbed, AddressOf vc_ImageGrabbed vc.Start() End Sub Private Sub vc_ImageGrabbed(sender As Object, e As EventArgs) Dim outangle As Double 0 Dim outpix As Double 0 Dim nextframe As New Mat vc.Retrieve(nextframe) If vc.Get(CapProp.PosFrames) vc.Get(CapProp.FrameCount) Then vc.Stop() vc.Dispose() RemoveHandler vc.ImageGrabbed, AddressOf vc_ImageGrabbed Exit Sub End If Dim net As Dnn.Net net DnnInvoke.ReadNetFromTensorflow(graph_opt.pb) Dim blob As Mat blob DnnInvoke.BlobFromImage(nextframe, 1.0, New Drawing.Size(360, 360), New MCvScalar(127.5, 127.5, 127.5), True, False) net.SetInput(blob) Dim mout As New Mat mout net.Forward() Dim fout(,,,) As Single fout mout.GetData() Dim H As Integer fout.GetLength(2) Dim W As Integer fout.GetLength(3) Dim lkeypoint As New List(Of Keypoint) lkeypoint getMaxPoint(fout) Dim x, y As Single For i As Integer 0 To lkeypoint.Count - 1 x (lkeypoint(i).p.X / W) * nextframe.Width y (lkeypoint(i).p.Y / H) * nextframe.Height If lkeypoint(i).conf 0.1 Then CvInvoke.Circle(nextframe, New Point(x, y), 5, New MCvScalar(0, 0, 255), -1) End If Next Dim startpoint As PointF Dim startpointx, startpointy As Single Dim endpoint As PointF Dim endpointx, endpointy As Single For Each body_Relation As Relation In body_Relations startpointx (lkeypoint(body_Relation.startpoint).p.X / W) * nextframe.Width startpointy (lkeypoint(body_Relation.startpoint).p.Y / H) * nextframe.Height startpoint New PointF(startpointx, startpointy) endpointx (lkeypoint(body_Relation.endpoint).p.X / W) * nextframe.Width endpointy (lkeypoint(body_Relation.endpoint).p.Y / H) * nextframe.Height endpoint New PointF(endpointx, endpointy) If lkeypoint(body_Relation.startpoint).conf 0.15 And lkeypoint(body_Relation.endpoint).conf 0.15 Then CvInvoke.Line(nextframe, PointFToPoint(startpoint), PointFToPoint(endpoint), New MCvScalar(0, 255, 0), 4) End If Next ImageBox1.Image nextframe Threading.Thread.Sleep(30)
End Sub
输出结果如下图所示
图11-11 视频中使用人体关键点连线
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