**
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_Widget
from PyQt5.QtWidgets import QApplication
from PyQt5.QtGui import QImage,QPixmap,QFont
from PyQt5 import QtWidgets
import sys
import cv2
import numpy as npclass 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labelself.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, QtWidgetsclass 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.translateWidget.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：
