python - 来自 Numpy 数组的 PyQt5 QImage

Question

考虑以下代码

from PyQt5.QtWidgets import QMainWindow, QLabel, QSizePolicy, QApplication 
from PyQt5.QtGui import QPixmap, QImage                                
from PyQt5.QtCore import Qt                                                                                              
import numpy as np                                                     
import sys



class Test(QMainWindow):                                                                                                                                                                                       

 def __init__(self):                                                                                                                                                                                        
     super().__init__()                                                                                                                                                                                     
     self.initUI()                                                                                                                                                                                          

 def initUI(self):                                                                                                                                                                                          
     self.setGeometry(10,10,640, 400)                                                                                                                                                                       

     pixmap_label = QLabel()                                                                                                                                                                                
     pixmap_label.setSizePolicy(QSizePolicy.Ignored, QSizePolicy.Ignored)                                                                                                                                   
     pixmap_label.resize(640,400)                                                                                                                                                                           
     pixmap_label.setAlignment(Qt.AlignCenter)                                                                                                                                                              

     im_np = np.ones((1800,2880,3),dtype=uint8)                                                                                                                                                                                  
     im_np = np.transpose(im_np, (1,0,2))                                                                                                                                                                              
     qimage = QImage(im_np, im_np.shape[1], im_np.shape[0],                                                                                                                                                 
                     QImage.Format_RGB888)                                                                                                                                                                 
     pixmap = QPixmap(qimage)                                                                                                                                                                               
     pixmap = pixmap.scaled(640,400, Qt.KeepAspectRatio)                                                                                                                                                    
     pixmap_label.setPixmap(pixmap)                                                                                                                                                                         

     self.setCentralWidget(pixmap_label)                                                                                                                                                                    
     self.show()                                                                                                                                                                                            



def main():                                                                                                                                                                                                    
  app = QApplication(sys.argv)                                                                                                                                                                               
  win = Test()                                                                                                                                                                                               
  sys.exit(app.exec_())                                                                                                                                                                                      



if __name__=="__main__":                                                                                                                                                                                       
  main()  

我收到以下错误

TypeError: arguments did not match any overloaded call: QImage(): too many arguments QImage(QSize, QImage.Format): argument 1 has unexpected type 'numpy.ndarray' QImage(int, int, QImage.Format): argument 1 has unexpected type 'numpy.ndarray' QImage(bytes, int, int, QImage.Format): argument 1 has unexpected type 'numpy.ndarray'
QImage(sip.voidptr, int, int, QImage.Format): argument 1 has unexpected type 'numpy.ndarray' QImage(bytes, int, int, int, QImage.Format): argument 1 has unexpected type 'numpy.ndarray'
QImage(sip.voidptr, int, int, int, QImage.Format): argument 1 has unexpected type 'numpy.ndarray' QImage(List[str]): argument 1 has unexpected type 'numpy.ndarray' QImage(str, format: str = None): argument 1 has unexpected type 'numpy.ndarray' QImage(QImage): argument 1 has unexpected type 'numpy.ndarray' QImage(Any): too many arguments

根据this post这可能是由 numpy 创建 View 引起的。修改行

 im_np = np.array(img)                                                                                                                                                                                  
 im_np = np.transpose(im_np, (1,0,2))                                                                                                                                                                              

至

im_np = np.array(img)                                                                                                                                                                                  
im_np = np.transpose(im_np, (1,0,2))                                                                                                                                                                              
im_np_cpy = np.copy(im_np)     

产生相同的错误。为了测试我没有通过 View ，我打印了测试结果

im_np_cpy.base is im_np

这是错误的。使用 cv2 可以正确显示图像。我显然错过了一些东西，知道什么吗？

干杯!

Answer 1

我在转置后添加了一个副本，如下所示:

im_np = np.transpose(im_np,(1,0,2)).copy()

这对我有用。