目前,我需要以伪彩色显示我的灰色图像。我使用 opencv2 生成伪色彩图。但是,我发现 cv2 和 QLabel 中显示的颜色图不同。
对于 cv2,代码为:
import numpy as np
import cv2
img = np.zeros((256,256),dtype=np.uint8)
img[0:128,0:128] = 255
img[128:255,128:255] = 128
disImg = cv2.applyColorMap(img, cv2.COLORMAP_AUTUMN)
cv2.imshow('test',disImg)
cv2.waitKey()
结果是:
然后,我使用相同的颜色图生成伪彩色图像,并使用drawpixmal进行显示,代码为:
import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import numpy as np
import cv2
class MyLabel(QLabel):
def __init__(self):
super(MyLabel, self).__init__()
img = np.zeros((256,256),dtype=np.uint8)
img[0:128,0:128] = 255
img[128:255,128:255] = 128
disImg = cv2.applyColorMap(img, cv2.COLORMAP_AUTUMN)
QImg = QImage(disImg.data, disImg.shape[1], disImg.shape[0], disImg.strides[0], QImage.Format_RGB888)
self.qimg = QImg
def paintEvent(self, QPaintEvent):
super(MyLabel, self).paintEvent(QPaintEvent)
pos = QPoint(0, 0)
source = QRect(0, 0, 256,256)
painter = QPainter(self)
painter.drawPixmap(pos, QPixmap.fromImage(self.qimg), source)
class Window(QWidget):
def __init__(self):
super(Window, self).__init__()
layout = QHBoxLayout(self)
self.resize(300,300)
self.label = MyLabel()
layout.addWidget(self.label)
if __name__ == '__main__':
app = QApplication(sys.argv)
window = Window()
window.show()
sys.exit(app.exec_())
结果是:
为什么显示相同的图像时颜色图不同?
所以,cv2显示的图像是正确的,而python drawpixmap显示错误。
如何解决?
最佳答案
感谢 Micka,opencv 使用 BGR,而 qt 使用 RGB 进行渲染。所以,正确的代码应该是:
import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import numpy as np
import cv2
class MyLabel(QLabel):
def __init__(self):
super(MyLabel, self).__init__()
img = np.zeros((256,256),dtype=np.uint8)
img[0:128,0:128] = 255
img[128:255,128:255] = 128
disImg = cv2.applyColorMap(img, cv2.COLORMAP_AUTUMN)
b = disImg[:,:,0]
g = disImg[:,:,1]
r = disImg[:,:,2]
img = np.zeros((256,256,3),dtype=np.uint8)
img[:,:,0] = r
img[:,:,1] = g
img[:,:,2] = b
disImg = img
QImg = QImage(disImg.data, disImg.shape[1], disImg.shape[0], disImg.strides[0], QImage.Format_RGB888)
self.qimg = QImg
def paintEvent(self, QPaintEvent):
super(MyLabel, self).paintEvent(QPaintEvent)
pos = QPoint(0, 0)
source = QRect(0, 0, 256,256)
painter = QPainter(self)
painter.drawPixmap(pos, QPixmap.fromImage(self.qimg), source)
class Window(QWidget):
def __init__(self):
super(Window, self).__init__()
layout = QHBoxLayout(self)
self.resize(300,300)
self.label = MyLabel()
layout.addWidget(self.label)
if __name__ == '__main__':
app = QApplication(sys.argv)
window = Window()
window.show()
sys.exit(app.exec_())
关于python - PyQt5中使用cv2.imshow和drawpixmap的颜色图是不同的,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50623735/