如何在C ++中使用ZeroMQ传达多个图像？

Question

我想实现可以通过ZeroMQ传达多个图像的程序。我可以使用OpenCV在C ++上显示多个图像，但是尽管编译器没有输出错误，但是我无法以某种方式在Python上显示。

如何将多个图像从C ++传递给Python？

C ++代码：

    Mat img0;
    Mat img1;
    Mat img2;

    img0 = imread("images.jpeg");
    img1 = imread("images1.jpeg");
    img2 = imread("image2.jpg");

    if(img0.empty()) return -1;
    if(img1.empty()) return -1;
    if(img2.empty()) return -1;
    ShowManyImages("IMAGE",3,img0,img1,img2);

// Let structure for zeroMQ
    int32_t info[3];

    info[0] = (int32_t)img0.rows;
    info[1] = (int32_t)img0.cols;
    info[2] = (int32_t)img0.type();

    info[3] = (int32_t)img1.rows;
    info[4] = (int32_t)img1.cols;
    info[5] = (int32_t)img1.type();

    info[6] = (int32_t)img2.rows;
    info[7] = (int32_t)img2.cols;
    info[8] = (int32_t)img2.type();


    zmq::context_t context (1);
    zmq::socket_t socket (context, ZMQ_REQ);
    socket.connect ("tcp://localhost:5555");

    for(i=0; i<9; i++ )
    {
        zmq::message_t msg0 ( (void*)&info[i], sizeof(int32_t), NULL  );
        socket.send(msg0, ZMQ_SNDMORE);
    }


    void* data0 = malloc(img0.total() * img0.elemSize());
    memcpy(data0, img0.data, img0.total() * img0.elemSize());

    zmq::message_t msg00(data0, img0.total() * img0.elemSize(), my_free, NULL);
    socket.send(msg00);


    void* data1 = malloc(img1.total() * img1.elemSize());
    memcpy(data1, img1.data, img1.total() * img1.elemSize());

    zmq::message_t msg11(data1, img1.total() * img1.elemSize(), my_free, NULL);
    socket.send(msg11);

    void* data2 = malloc(img2.total() * img2.elemSize());
    memcpy(data2, img2.data, img2.total() * img2.elemSize());

    zmq::message_t msg22(data2, img2.total() * img2.elemSize(), my_free, NULL);
    socket.send(msg22);

Python代码：

import zmq
import cv2
import struct
import numpy as np

# Connection String
conn_str      = "tcp://*:5555"

# Open ZMQ Connection
ctx = zmq.Context()
sock = ctx.socket(zmq.REP)
sock.bind(conn_str)


while(True):
# Receve Data from C++ Program
    byte_rows, byte_cols, byte_mat_type, data=  sock.recv_multipart()

# Convert byte to integer
    rows = struct.unpack('i', byte_rows)
    cols = struct.unpack('i', byte_cols)
    mat_type = struct.unpack('i', byte_mat_type)

    if mat_type[0] == 0:
    # Gray Scale
        image = np.frombuffer(data, dtype=np.uint8).reshape((rows[0],cols[0]))
    else:
    # BGR Color
        image = np.frombuffer(data, dtype=np.uint8).reshape((rows[0],cols[0],3))

    cv2.imshow('Python',image)
    cv2.waitKey()

真诚地，

Answer 1

Q：

如何将多个图像从C ++传递到Python？