OpenCV2 Qt Quick Python

[Minhtam]

Hi everyone!
I wonder why there is no simple example to stream the cv2.videocapture(camera/videopath) frame to Qt Quick Python? (There are a lot of samples on QWidget but it is ugly) There are many projects with the output cv2.imshow(frame) like YOLOv5,v6,v7 object detection, and so on. I cannot find any example that works on QML+Python that could work instantly for quicker development. Please share with me if you have any examples. Thank you in advance <3

[Minhtam]

community is cold

here my embrace

# This Python file uses the following encoding: utf-8
import datetime
import os
import sys
from pathlib import Path
import cv2
from PySide6.QtCore import QObject, Slot, QTimer, Signal, QThread, Qt
from PySide6.QtGui import QGuiApplication, QImage
from PySide6.QtQml import QQmlApplicationEngine
from PySide6.QtQuick import QQuickImageProvider


class CameraThread(QThread):
    updateFrame = Signal(QImage)
    def __init__(self, parent=None):
        QThread.__init__(self, parent)

    def run(self):
        self.cap = cv2.VideoCapture(0, apiPreference=cv2.CAP_ANY, params=[
        cv2.CAP_PROP_FRAME_WIDTH, 1280,
        cv2.CAP_PROP_FRAME_HEIGHT, 720])
        while self.cap.isOpened():
            print("Camera Thread working")
            ret, frame = self.cap.read()
            if not ret:
                print("holy banana")
                pass
            color_frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
            print(color_frame.shape[1])
            print(color_frame.shape[0])
            img = QImage(color_frame.data, color_frame.shape[1], color_frame.shape[0], QImage.Format_RGB888)
            self.updateFrame.emit(img)
    def stop(self):
            self.ThreadActive = False
            self.quit()

class CamProvider(QQuickImageProvider):
    image = None

    def __init__(self):
        super(CamProvider, self).__init__(QQuickImageProvider.Image)
        self.cam = CameraThread()
        self.cam.updateFrame.connect(self.update_image)

    def requestImage(self, id, size, requestedSize):
        if id == "img?id=false" or "img?id=true":
            if self.image:
                img = self.image
            else:
                img = QImage(1280, 720, QImage.Format_RGBA8888)
                img.fill(Qt.black)
        return img

    imageChanged = Signal(bool)
    cameraError = Signal(bool)

    @Slot()
    def update_image(self, img):
        self.imageChanged.emit(True)
        self.image = img

    @Slot()
    def start(self):
        try:
            self.cam.start()
            print("Starting...")
        except:
            self.cameraError.emit(True)

    @Slot()
    def stop(self):
        self.cam.cap.release()
        self.cam.stop()
        print("Finishing...")


class MainWindow(QObject):

    def __init__(self):
        QObject.__init__(self)
        self.timer = QTimer()
        self.timer.timeout.connect(lambda: self.setTime())
        self.timer.start(1000)

    signal_time = Signal(str)

    @Slot(str)
    def setTime(self):
        global date
        now = datetime.datetime.now()
        date = now.strftime("%02H:%M")
        self.signal_time.emit(date)

if __name__ == "__main__":
    app = QGuiApplication(sys.argv)
    engine = QQmlApplicationEngine()

    # Get Context (Link between backend python and frontend QML)
    main = MainWindow()
    engine.rootContext().setContextProperty("backend", main)
    #Camera
    camProvider = CamProvider()
    engine.rootContext().setContextProperty("camProvider", camProvider)
    engine.addImageProvider("camProvider", camProvider)

    engine.load(os.fspath(Path(__file__).resolve().parent / "qml/main.qml"))
    if not engine.rootObjects():
        sys.exit(-1)
    sys.exit(app.exec_())

[Minhtam]

@Minhtam said in OpenCV2 Qt Quick Python:

  self.cap = cv2.VideoCapture(0, apiPreference=cv2.CAP_ANY, params=[
    cv2.CAP_PROP_FRAME_WIDTH, 1280,
    cv2.CAP_PROP_FRAME_HEIGHT, 720])

well, I just found a solution and then apply for little Jetson Nano but can not get it from pip. Then I try to build from source PySide6 but again "Qt for small business" cold again