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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