定位色块常用到hsv色彩空间下的颜色阈值，笔者曾经用openmv时，其IDE有自带一个阈值编辑器，使用起来非常方便，现在在linux上跑cv算法，需要类似的功能，因此自己写了一个阈值编辑器。 目前暂时只支持HSV色彩空间下的阈值编辑。

from threshold_ui import Ui_Widget
from PyQt5.QtWidgets import QApplication
from PyQt5.QtGui import QImage,QPixmap,QFont
from PyQt5 import QtWidgets
import sys
import cv2
import numpy as np
class Threshold_Value_Edit(QtWidgets.QWidget,Ui_Widget):
    def __init__(self): #UI初始化
        super(Threshold_Value_Edit,self).__init__()
        self.setupUi(self)
        self.setWindowTitle("阈值编辑器")
        img_path = r'D:\Pictures\screenshot.png'
        ft=QFont()
        ft.setPointSize(12)
        self.horizontalSlider.setMaximum(255)
        self.horizontalSlider_2.setMaximum(255)
        self.horizontalSlider_3.setMaximum(255)
        self.horizontalSlider_4.setMaximum(255)
        self.horizontalSlider_5.setMaximum(255)
        self.horizontalSlider_6.setMaximum(255)
        self.horizontalSlider.setValue(255)
        self.horizontalSlider_3.setValue(255)
        self.horizontalSlider_5.setValue(255)
        self.label.setText("H最大值:"+str(self.horizontalSlider.value()))
        self.label_2.setText("H最小值:"+str(self.horizontalSlider_2.value()))
        self.label_3.setText("S最大值:"+str(self.horizontalSlider_3.value()))
        self.label_4.setText("S最小值:"+str(self.horizontalSlider_4.value()))
        self.label_5.setText("V最大值:"+str(self.horizontalSlider_5.value()))
        self.label_6.setText("V最小值:"+str(self.horizontalSlider_6.value()))
        self.label.setFont(ft)
        self.label_2.setFont(ft)
        self.label_3.setFont(ft)
        self.label_4.setFont(ft)
        self.label_5.setFont(ft)
        self.label_6.setFont(ft)
        self.lineEdit.setText("HSVmin:  HSVmax:")
        self.lineEdit.setFont(ft)
        self.img = cv2.imread(img_path)
        self.label_image_show(self.img)
        self.horizontalSlider.valueChanged[int].connect(self.horizontalSlider1_changeValue)
        self.horizontalSlider_2.valueChanged[int].connect(self.horizontalSlider2_changeValue)
        self.horizontalSlider_3.valueChanged[int].connect(self.horizontalSlider3_changeValue)
        self.horizontalSlider_4.valueChanged[int].connect(self.horizontalSlider4_changeValue)
        self.horizontalSlider_5.valueChanged[int].connect(self.horizontalSlider5_changeValue)
        self.horizontalSlider_6.valueChanged[int].connect(self.horizontalSlider6_changeValue)
    def label_image_show(self,img):
        if(len(img.shape)==2):
            img = cv2.merge([img,img,img])
        height, width, bytesPerComponent = img.shape   #返回的是图像的行数，列数，色彩通道数
        bytesPerLine = 3 * width    #每行的字节数        
        cv2.cvtColor(img, cv2.COLOR_BGR2RGB, img)
        QImg = QImage(img.data, width, height, bytesPerLine, QImage.Format_RGB888)         
        pixmap = QPixmap.fromImage(QImg)
        self.label_7.setPixmap(pixmap)
        #print(img.shape[0],img.shape[1])
        self.label_7.update()
    def horizontalSlider1_changeValue(self):  #更新画板和滑条前的label
        self.label.setText("H最大值:"+str(self.horizontalSlider.value()))
        self.change_lineedit_value()
        self.HSV_img_change()
    def horizontalSlider2_changeValue(self):
        self.label_2.setText("H最小值:"+str(self.horizontalSlider_2.value()))
        self.change_lineedit_value()
        self.HSV_img_change()
    def horizontalSlider3_changeValue(self):
        self.label_3.setText("S最大值:"+str(self.horizontalSlider_3.value()))
        self.change_lineedit_value()
        self.HSV_img_change()
    def horizontalSlider4_changeValue(self):
        self.label_4.setText("S最小值:"+str(self.horizontalSlider_4.value()))
        self.change_lineedit_value()
        self.HSV_img_change()
    def horizontalSlider5_changeValue(self):
        self.label_5.setText("V最大值:"+str(self.horizontalSlider_5.value()))
        self.change_lineedit_value()
        self.HSV_img_change()
    def horizontalSlider6_changeValue(self):
        self.label_6.setText("V最小值:"+str(self.horizontalSlider_6.value()))
        self.change_lineedit_value()
        self.HSV_img_change()
    def change_lineedit_value(self):
        self.lineEdit.setText("HSVmin:["+str(self.horizontalSlider_2.value())+","+str(self.horizontalSlider_4.value())+","+str(self.horizontalSlider_6.value())+"] HSVmax:["+str(self.horizontalSlider.value())+","+str(self.horizontalSlider_3.value())+","+str(int(self.horizontalSlider_5.value()))+"]")
    def HSV_img_change(self):
        hsv_min = np.array([self.horizontalSlider_2.value(),self.horizontalSlider_4.value(),self.horizontalSlider_6.value()])
        hsv_max = np.array([self.horizontalSlider.value(),self.horizontalSlider_3.value(),self.horizontalSlider_5.value()])
        hsv = cv2.cvtColor(self.img, cv2.COLOR_BGR2HSV)                 # 转化成HSV图像
        erode_hsv = cv2.erode(hsv, None, iterations=8)                   # 腐蚀 细的变粗
        inRange_hsv = cv2.inRange(erode_hsv,hsv_min,hsv_max)
        self.label_image_show(inRange_hsv)
        print("hsv_min:")
        print(hsv_min)
        print("hsv_max:")
        print(hsv_max)        
if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = Threshold_Value_Edit()
    w.__init__()
    w.show()
    sys.exit(app.exec_())
threshold_ui.py:




    
 
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'widget.ui'
# Created by: PyQt5 UI code generator 5.9.2
# WARNING! All changes made in this file will be lost!
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_Widget(object):
    def setupUi(self, Widget):
        Widget.setObjectName("Widget")
        Widget.resize(942, 247)
        self.horizontalLayout = QtWidgets.QHBoxLayout(Widget)
        self.horizontalLayout.setContentsMargins(11, 11, 11, 11)
        self.horizontalLayout.setSpacing(6)
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.label_7 = QtWidgets.QLabel(Widget)
        self.label_7.setObjectName("label_7")
        self.horizontalLayout.addWidget(self.label_7)
        self.formLayout = QtWidgets.QFormLayout()
        self.formLayout.setSpacing(6)
        self.formLayout.setObjectName("formLayout")
        self.label = QtWidgets.QLabel(Widget)
        self.label.setObjectName("label")
        self.formLayout.setWidget(0, QtWidgets.QFormLayout.LabelRole, self.label)
        self.horizontalSlider = QtWidgets.QSlider(Widget)
        self.horizontalSlider.setOrientation(QtCore.Qt.Horizontal)
        self.horizontalSlider.setObjectName("horizontalSlider")
        self.formLayout.setWidget(0, QtWidgets.QFormLayout.FieldRole, self.horizontalSlider)
        self.label_2 = QtWidgets.QLabel(Widget)
        self.label_2.setObjectName("label_2")
        self.formLayout.setWidget(1, QtWidgets.QFormLayout.LabelRole, self.label_2)
        self.horizontalSlider_2 = QtWidgets.QSlider(Widget)
        self.horizontalSlider_2.setOrientation(QtCore.Qt.Horizontal)
        self.horizontalSlider_2.setObjectName("horizontalSlider_2")
        self.formLayout.setWidget(1, QtWidgets.QFormLayout.FieldRole, self.horizontalSlider_2)
        self.label_3 = QtWidgets.QLabel(Widget)
        self.label_3.setObjectName("label_3")
        self.formLayout.setWidget(2, QtWidgets.QFormLayout.LabelRole, self.label_3)
        self.horizontalSlider_3 = QtWidgets.QSlider(Widget)
        self.horizontalSlider_3.setOrientation(QtCore.Qt.Horizontal)
        self.horizontalSlider_3.setObjectName("horizontalSlider_3")
        self.formLayout.setWidget(2, QtWidgets.QFormLayout.FieldRole, self.horizontalSlider_3)
        self.label_4 = QtWidgets.QLabel(Widget)
        self.label_4.setObjectName("label_4")
        self.formLayout.setWidget(3, QtWidgets.QFormLayout.LabelRole, self.label_4)
        self.horizontalSlider_4 = QtWidgets.QSlider(Widget)
        self.horizontalSlider_4.setOrientation(QtCore.Qt.Horizontal)
        self.horizontalSlider_4.setObjectName("horizontalSlider_4")
        self.formLayout.setWidget(3, QtWidgets.QFormLayout.FieldRole, self.horizontalSlider_4)
        self.label_5 = QtWidgets.QLabel(Widget)
        self.label_5.setObjectName("label_5")
        self.formLayout.setWidget(4, QtWidgets.QFormLayout.LabelRole, self.label_5)
        self.horizontalSlider_5 = QtWidgets.QSlider(Widget)
        self.horizontalSlider_5.setOrientation(QtCore.Qt.Horizontal)
        self.horizontalSlider_5.setObjectName("horizontalSlider_5")
        self.formLayout.setWidget(4, QtWidgets.QFormLayout.FieldRole, self.horizontalSlider_5)
        self.label_6 = QtWidgets.QLabel(Widget)
        self.label_6.setObjectName("label_6")
        self.formLayout.setWidget(5, QtWidgets.QFormLayout.LabelRole, self.label_6)
        self.horizontalSlider_6 = QtWidgets.QSlider(Widget)
        self.horizontalSlider_6.setOrientation(QtCore.Qt.Horizontal)
        self.horizontalSlider_6.setObjectName("horizontalSlider_6")
        self.formLayout.setWidget(5, QtWidgets.QFormLayout.FieldRole, self.horizontalSlider_6)
        self.lineEdit = QtWidgets.QLineEdit(Widget)
        self.lineEdit.setObjectName("lineEdit")
        self.formLayout.setWidget(6, QtWidgets.QFormLayout.SpanningRole, self.lineEdit)
        self.horizontalLayout.addLayout(self.formLayout)
        self.retranslateUi(Widget)
        QtCore.QMetaObject.connectSlotsByName(Widget)
    def retranslateUi(self, Widget):
        _translate = QtCore.QCoreApplication.translate
        Widget.setWindowTitle(_translate("Widget", "Widget"))
        self.label_7.setText(_translate("Widget", "TextLabel"))
        self.label.setText(_translate("Widget", "H最大值"))
        self.label_2.setText(_translate("Widget", "H最小值"))
        self.label_3.setText(_translate("Widget", "S最大值"))
        self.label_4.setText(_translate("Widget", "S最小值"))
        self.label_5.setText(_translate("Widget", "V最大值"))
        self.label_6.setText(_translate("Widget", "V最小值"))
第二份代码保存为threshold_ui.py，第一份可保存为任意文件名.py，放到同一目录下，运行第一份代码即可，img_path需修改为目标图片的绝对路径。
 
程序界面截图：
 
阈值选取：
 
                    **定位色块常用到hsv色彩空间下的颜色阈值，笔者曾经用openmv时，其IDE有自带一个阈值编辑器，使用起来非常方便，现在在linux上跑cv算法，需要类似的功能，因此自己写了一个阈值编辑器。 目前暂时只支持HSV色彩空间下的阈值编辑。**代码：mian.py:from threshold_ui import Ui_Widgetfrom PyQt5.QtWidgets import QApplicationfrom PyQt5.QtGui import QImage,QPixmap,QFon
				
OpenMv安装软件及驱动1.安装软件2.硬件连接运行状态3.官方例程运行4.新建工程以及其它功能功能快捷键合理的创建标题，有助于目录的生成如何改变文本的样式插入链接与图片如何插入一段漂亮的代码片生成一个适合你的列表创建一个表格设定内容居中、居左、居右SmartyPants创建一个自定义列表如何创建一个注脚注释也是必不可少的KaTeX数学公式新的甘特图功能，丰富你的文章UML 图表FLowchart流程图导出与导入导出导入
1.安装软件
从星瞳官网下载OpenMv软件，里面有ubuntu,windows，m




    

				
PyQt5是一个Python的GUI编程工具包，而OpenCV是一个计算机视觉库。在PyQt5中，可以使用QLabel控件来显示图片，而OpenCV可以读取和处理图像。因此，我们可以将两者结合起来，使用OpenCV读取图像，然后使用PyQt5的QLabel控件来显示图像。
以下是一个简单的示例代码：
```python
import cv2
from PyQt5.QtGui import QImage, QPixmap
from PyQt5.QtWidgets import QApplication, QLabel, QWidget
from PyQt5.QtCore import Qt
class ImageWidget(QWidget):
    def __init__(self):
        super().__init__()
        # 读取图像
        self.image = cv2.imread('image.jpg')
        # 将OpenCV图像转换为PyQt5图像
        self.qimage = self.convert_cv_to_qt(self.image)
        # 创建QLabel控件并设置图像
        self.label = QLabel(self)
        self.label.setPixmap(QPixmap.fromImage(self.qimage))
    def convert_cv_to_qt(self, image):
        """将OpenCV图像转换为PyQt5图像"""
        rgb_image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
        h, w, ch = rgb_image.shape
        bytes_per_line = ch * w
        qimage = QImage(rgb_image.data, w, h, bytes_per_line, QImage.Format_RGB888)
        return qimage
if __name__ == '__main__':
    app = QApplication([])
    widget = ImageWidget()
    widget.show()
    app.exec_()
在这个示例中，我们首先使用OpenCV读取了一张名为“image.jpg”的图像。然后，我们将OpenCV图像转换为PyQt5图像，并使用QLabel控件来显示图像。最后，我们创建了一个QWidget窗口并将QLabel控件添加到其中。
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