有没有办法将OpenCV的imshow()函数集成到python中的kivy或kv文件中 [英] Is there a way to integrate the imshow() function of OpenCV into kivy or kv file in python

问题描述

我是新来的，希望能得到一点帮助，我会很高兴的。 我用PYTHON、Kivy和OpenCV写了一个小程序。 问题是，我希望将我的网络摄像头与OpenCV集成在一起，而不是通过Kivy现有的摄像头功能。 我已经在Integrate OpenCV webcam into a Kivy user interface中发现了类似的问题，但这并不能解决我的问题。 在我的OpenCV代码中，也运行面部识别代码(https://github.com/ageitgey/face_recognition/blob/master/examples/facerec_from_webcam_faster.py)。因此，发出命令imshow()很重要。如何将imshow()的摄像头版本从OpenCV集成到Kivy或集成到KV文件中？ 不幸的是，我不知道这样的事情是否会奏效。你们中有谁能帮我或者有个主意。非常感谢您的帮助。

Python文件：

import cv2
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen


class MainScreen(Screen):
    pass


class Manager(ScreenManager):
    pass


kv = Builder.load_file("file.kv")


class Main(App):
    def build(self):
        return kv


if __name__ == '__main__':
    Main().run()

OpenCV-Code：

import cv2

cam = cv2.VideoCapture(0)
while(True):
    ret, frame = cam.read()
    # ...
    # more code
    # ...
    cv2.imshow('frame',frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

我的Kivy文件(最小)：

MainScreen:
    MainScreen:

<MainScreen>:
    name: "Test"

    FloatLayout:
        Label:
            text: "Webcam from OpenCV?"
            pos_hint: {"x":0.0, "y":0.8}
            size_hint: 1.0, 0.2


        Button:
            text: 'Click me!!'
            pos_hint: {"x":0.0, "y":0.0}
            size_hint: 1.0, 0.2
            font_size: 50

推荐答案

这里有一个黑客攻击，我认为它可以做你想要的事情：

import threading
from functools import partial
import cv2
from kivy.app import App
from kivy.clock import Clock
from kivy.graphics.texture import Texture
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen


class MainScreen(Screen):
    pass


class Manager(ScreenManager):
    pass


Builder.load_string('''
<MainScreen>:
    name: "Test"

    FloatLayout:
        Label:
            text: "Webcam from OpenCV?"
            pos_hint: {"x":0.0, "y":0.8}
            size_hint: 1.0, 0.2

        Image:
            # this is where the video will show
            # the id allows easy access
            id: vid
            size_hint: 1, 0.6
            allow_stretch: True  # allow the video image to be scaled
            keep_ratio: True  # keep the aspect ratio so people don't look squashed
            pos_hint: {'center_x':0.5, 'top':0.8}

        Button:
            text: 'Stop Video'
            pos_hint: {"x":0.0, "y":0.0}
            size_hint: 1.0, 0.2
            font_size: 50
            on_release: app.stop_vid()
''')


class Main(App):
    def build(self):

        # start the camera access code on a separate thread
        # if this was done on the main thread, GUI would stop
        # daemon=True means kill this thread when app stops
        threading.Thread(target=self.doit, daemon=True).start()

        sm = ScreenManager()
        self.main_screen = MainScreen()
        sm.add_widget(self.main_screen)
        return sm

    def doit(self):
        # this code is run in a separate thread
        self.do_vid = True  # flag to stop loop

        # make a window for use by cv2
        # flags allow resizing without regard to aspect ratio
        cv2.namedWindow('Hidden', cv2.WINDOW_NORMAL | cv2.WINDOW_FREERATIO)

        # resize the window to (0,0) to make it invisible
        cv2.resizeWindow('Hidden', 0, 0)
        cam = cv2.VideoCapture(0)

        # start processing loop
        while (self.do_vid):
            ret, frame = cam.read()
            # ...
            # more code
            # ...

            # send this frame to the kivy Image Widget
            # Must use Clock.schedule_once to get this bit of code
            # to run back on the main thread (required for GUI operations)
            # the partial function just says to call the specified method with the provided argument (Clock adds a time argument)
            Clock.schedule_once(partial(self.display_frame, frame))

            cv2.imshow('Hidden', frame)
            cv2.waitKey(1)
        cam.release()
        cv2.destroyAllWindows()

    def stop_vid(self):
        # stop the video capture loop
        self.do_vid = False

    def display_frame(self, frame, dt):
        # display the current video frame in the kivy Image widget

        # create a Texture the correct size and format for the frame
        texture = Texture.create(size=(frame.shape[1], frame.shape[0]), colorfmt='bgr')

        # copy the frame data into the texture
        texture.blit_buffer(frame.tobytes(order=None), colorfmt='bgr', bufferfmt='ubyte')

        # flip the texture (otherwise the video is upside down
        texture.flip_vertical()

        # actually put the texture in the kivy Image widget
        self.main_screen.ids.vid.texture = texture


if __name__ == '__main__':
    Main().run()

这会隐藏imshow()窗口(将其大小设为0x0)，然后在ImageWidget中显示框架。不确定窗口大小0x0是否会干扰您的其他代码。

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