Python 字节流转图像

Question

我正在尝试实现与这个问题相同的结果，但使用的是彩色图像：

Here is my input image

This is what my code display

C++ 方面：

cv::Mat frame = cv::imread("/home/victor/Images/Zoom.png");

int height = frame.rows; //480
int width = frame.cols; // 640
zmq_send(static_cast<void *>(pubSocket), frame.data, (height*width*3*sizeof(uint8_t)), ZMQ_NOBLOCK);

Python 边 :

    try:
        image_bytes = self._subsocketVideo.recv(flags=zmq.NOBLOCK)
        width = 480
        height = 640
        try:
            temp = numpy.frombuffer(image_bytes, dtype=numpy.uint8)
            self.currentFrame = temp.reshape(height, width, 3)
        except Exception as e :
            print("Failed to create frame :")
            print(e)
    except zmq.Again as e:
        raise e

Python 显示图像的代码：这部分有效，我尝试使用静态图像而不是网络上的图像

def videoCB(self):
    try:
        self._socket.subVideoReceive()
        print("Creating QImg")
        qimg = QImage(self._socket.currentFrame.data, 480, 640, 3*480, QImage.Format_RGB888)
        print("Creating pixmap")
        pixmap = QtGui.QPixmap.fromImage(qimg)
        print("Setting pixmap")
        self.imageHolder.setPixmap(pixmap)

        self.imageHolder.show()

    except Exception as e:
        print(e)

        pass

我觉得我有 2 或 3 个问题:

为什么我的输出图像宽度大于高度？我尝试在 reshape 中反转高度和宽度，没有任何结果
某处似乎有 RGB 混淆
总的来说，我觉得数据在那里，但我没有把它们正确地放在一起。

reshape 函数看起来什么都不做，没有它我的输出是一样的。

想法？

Answer 1

使用opencv cv2.imdecode

import cv2

try:
    image_bytes = self._subsocketVideo.recv(flags=zmq.NOBLOCK)
    width = 480
    height = 640
    try:
        temp = numpy.frombuffer(image_bytes, dtype=numpy.uint8)
        self.currentFrame = cv2.imdecode(temp, flags=cv2.IMREAD_COLOR)
    except Exception as e :
        print("Failed to create frame :")
        print(e)
except zmq.Again as e:
    raise e

或Pillow

import io
from PIL import Image

...

img = Image.open(image_bytes)
self.currentFrame = np.asarray(img)[..., :-1]  # No need for last channel

...

Answer 2

设法使其工作：将 python 侧更改为

image2 = Image.frombytes('RGB', (height,width), image_bytes)
self.currentFrame = ImageQt(image2)

并以

显示

qimg = QImage(self._socket.currentFrame)
pixmap = QtGui.QPixmap.fromImage(qimg)
self.imageHolder.setPixmap(pixmap)
self.imageHolder.show()

Python 字节流转图像

Python bytestream to image

python

c++

image

zeromq