1

I am trying to process some videos using openCV and then put it inside pyqt Qimage...

I saw some examples to do that but they are all in C++ and I can understand python only,

Can anyone help me please ... thank you

4

4 回答 4

2

您可以使用以下代码将 numpy 数组转换为 QImage：

from PyQt4.QtGui import QImage, qRgb
import numpy as np

class NotImplementedException:
    pass

gray_color_table = [qRgb(i, i, i) for i in range(256)]

def toQImage(im, copy=False):
    if im is None:
        return QImage()

    if im.dtype == np.uint8:
        if len(im.shape) == 2:
            qim = QImage(im.data, im.shape[1], im.shape[0], im.strides[0], QImage.Format_Indexed8)
            qim.setColorTable(gray_color_table)
            return qim.copy() if copy else qim

        elif len(im.shape) == 3:
            if im.shape[2] == 3:
                qim = QImage(im.data, im.shape[1], im.shape[0], im.strides[0], QImage.Format_RGB888);
                return qim.copy() if copy else qim
            elif im.shape[2] == 4:
                qim = QImage(im.data, im.shape[1], im.shape[0], im.strides[0], QImage.Format_ARGB32);
                return qim.copy() if copy else qim

    raise NotImplementedException

然后在调用之前将 OpenCV 的 CvMat 转换为 numpy 数组toQImage()

arr = numpy.asarray(mat)
qim = toQImage(arr)

有关 OpenCV 的 CvMat 和 numpy 数组之间的转换，另请参见http://opencv.willowgarage.com/documentation/python/cookbook.html。

于 2011-09-12T13:34:34.303 回答
1

这对我有用。

camcapture = cv.CaptureFromCAM(0)       
cv.SetCaptureProperty(camcapture,cv.CV_CAP_PROP_FRAME_WIDTH, 1280)
cv.SetCaptureProperty(camcapture,cv.CV_CAP_PROP_FRAME_HEIGHT, 720);

frame = cv.QueryFrame(camcapture)
image = QImage(frame.tostring(), frame.width, frame.height, QImage.Format_RGB888).rgbSwapped()
pixmap = QPixmap.fromImage(image)
于 2012-04-07T09:22:16.753 回答
0

我想从 cvMat 到 QImage 对话问同样的问题，但我没有找到任何 python 示例。

我是这样解决的：

pano = cv.CreateMat(int(height),int(width),0)
cv.Zero(pano)
cv.Resize(self.image,pano)
self._data=pano.tostring('raw') 
image2=QImage(self._data,pano.width,pano.height,QtGui.QImage.Format_Indexed8)

self.imageLabel.setPixmap(QPixmap(image2))
于 2013-04-30T13:51:47.580 回答
0

此功能使用 QT5 对我有用，使用本地磁盘中的 JPEG

from PyQt5.QtGui import QImage

def convertMatToQImage(cvImg):
    return QImage(cvImg.data, cvImg.shape[1], cvImg.shape[0], QImage.Format_RGB32)
于 2017-01-12T10:28:43.440 回答