将CV2 numpy数组转换为QImage时如何配置颜色? [英] How to configure color when convert CV2 numpy array to QImage?
问题描述
该程序基于pyqt和opencv.我计划在使用QT作为GUI的同时使用opencv读取和处理图像.
The program is based on pyqt and opencv. I plan to read and process image with opencv while using QT as GUI.
当我打开灰色图像时,结果正常.但是,当打开彩色图像时,它将改变图像的颜色.我猜这是因为我在将numpy数组转换为OImage类型时犯了错误,但是我不知道如何纠正它.
when I open a gray image, The result is OK. But it will change the color of image when opening a color image. I guess it's because I made mistake when I convert numpy array to OImage type, but I can't figure out how to correct it.
# -*- coding: utf-8 -*-
from PyQt4.QtGui import *
from PyQt4.QtCore import *
import sys
import cv2
from cv2 import cv
QTextCodec.setCodecForTr(QTextCodec.codecForName("utf8"))
class MainWindow(QMainWindow):
def __init__(self,parent=None):
super(MainWindow,self).__init__(parent)
self.setWindowTitle("Show Image with pyqt")
self.imageLabel=QLabel()
self.imageLabel.setSizePolicy(QSizePolicy.Ignored,QSizePolicy.Ignored)
self.setCentralWidget(self.imageLabel)
self.image=QImage()
self.createActions()
self.createMenus()
self.cv_img = None
def createActions(self):
self.fileOpenAction=QAction(QIcon(":/fileopen.png"),self.tr("Open"),self)
self.fileOpenAction.setShortcut("Ctrl+O")
self.fileOpenAction.setStatusTip(self.tr("Open the file"))
self.connect(self.fileOpenAction,SIGNAL("triggered()"),self.slotOpenFile)
self.exitAction=QAction(QIcon(":/filequit.png"),self.tr("Quit"),self)
self.exitAction.setShortcut("Ctrl+Q")
self.setStatusTip(self.tr("Quit"))
self.connect(self.exitAction,SIGNAL("triggered()"),self.close)
def createMenus(self):
fileMenu=self.menuBar().addMenu(self.tr("File"))
fileMenu.addAction(self.fileOpenAction)
fileMenu.addAction(self.exitAction)
def slotOpenFile(self):
fileName=QFileDialog.getOpenFileName(self,self.tr("Open a file"),\
".",self.tr("Image File(*.png *.jpg *.jpeg *.bmp)"))
cvfilename=fileName.toLocal8Bit().data()
if fileName.isEmpty()==False:
cvfilename=fileName.toLocal8Bit().data() #convert Qstring to char*
self.cv_img = cv2.imread(cvfilename) #read image with opencv
cv2.imshow("Show Image with Opencv",self.cv_img) #show image with opencv, this is the right result
self.image =QImage(self.cv_img.tostring(),\
self.cv_img.shape[0],self.cv_img.shape[1],QImage.Format_RGB888) #convert numpy array to QImage
self.imageLabel.setPixmap(QPixmap.fromImage(self.image))
self.resize(self.image.width(),self.image.height())
app=QApplication(sys.argv)
main=MainWindow()
main.show()
app.exec_()
推荐答案
您需要将图像数据从BGR转换为RGB.您还需要交换宽度和高度(请参见下文)-您的代码仅适用于宽度和高度相同的图像.
You need to convert the image data from BGR to RGB. You also need to swap width and height (see below) -- your code only works for images with same width and height.
self.cv_img = cv2.imread(cvfilename)
if self.cv_img != None:
# Notice the dimensions.
height, width, bytesPerComponent = cv_img.shape
bytesPerLine = bytesPerComponent * width;
cv2.imshow("Show Image with Opencv", self.cv_img)
# Convert to RGB for QImage.
cv2.cvtColor(self.cv_img, cv.CV_BGR2RGB, self.cv_img)
self.image = QImage(self.cv_img.data, width, height, bytesPerLine, QImage.Format_RGB888)
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