opencv+pyQt5实现图片阈值编辑器/寻色块阈值利器

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 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：

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