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，问题是我想把我的摄像头和opencv整合在一起，而不是通过kivy现有的摄像头功能，我已经在这里找到了一个类似的问题。将OpenCV网络摄像头集成到Kivy用户界面中。 但这并不能解决我的问题，在我的OpenCV代码中，还运行了一个面部识别的代码(https:/github.comageitgeyface_recognitionblobmasterexamplesfacerec_from_webcam_faster.py。). 因此，重要的是，命令 imshow() 是发出的。如何将网络摄像头版本的 imshow() 从 Opencv 到 kivy 或到 kv 文件中去？你们谁能帮帮我，或者有什么办法。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 -代码：
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
这里有一个黑客，可以实现我认为你想要的东西。
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()
这可以隐藏... imshow() 窗口(使其大小为0x0)，然后在一个 Image Widget. 不知道窗口大小为0x0是否会影响你的其他代码。
我使用了上面的代码并做了一些修改。当我用kivy文件代替ScreenManger时，问题就出现了。在我的例子中，没有视频输出，代码中的问题是什么？
main.py
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 Scan(Screen):
pass
class WindowManager(ScreenManager):
pass
kv = Builder.load_file("kivy.kv")
class Main(App):
def build(self):
threading.Thread(target=self.doit, daemon=True).start()
self.new_screen = Scan() # ?
return kv
def doit(self):
self.do_vid = True
cv2.namedWindow('Hidden', cv2.WINDOW_NORMAL | cv2.WINDOW_FREERATIO)
cv2.resizeWindow('Hidden', 0, 0)
cam = cv2.VideoCapture(0)
while (self.do_vid):
ret, frame = cam.read()
# ...
Clock.schedule_once(partial(self.display_frame, frame))
cv2.imshow('Hidden', frame)
cv2.waitKey(1)
cam.release()
cv2.destroyAllWindows()
def display_frame(self, frame, dt):
texture = Texture.create(size=(frame.shape[1], frame.shape[0]), colorfmt='bgr')
texture.blit_buffer(frame.tobytes(order=None), colorfmt='bgr', bufferfmt='ubyte')
texture.flip_vertical()
# No output of the Video Stream
# Scan().ids.vid.texture = texture also doesn't work
self.new_screen.ids.vid.texture = texture
if __name__ == '__main__':
Main().run()
kivy.kv
WindowManager:
Scan:
<Scan>:
name: 'scan'
FloatLayout:
Image:
id: vid
allow_stretch: True
keep_ratio: True
pos_hint: {'x':0.0, 'y':0.2}
size_hint: 1.0, 0.8
Button:
id: button_start
text: 'Button'
pos_hint: {'x':0.0, 'y':0.0}
size_hint: 0.7, 0.2
background_color: 0.7, 0.9, 0.0, 1
font_size: 50
Image:
id: folder
source: 'pic/folder.png'
pos_hint: {'x':0.7, 'y':0.0}
size_hint: 0.3, 0.2