使用kivy和pygame显示从摄像头拍的照片

摄像头拍的照片"/>

使用kivy和pygame显示从摄像头拍的照片

使用kivy和pygame显示从摄像头拍的照片

1.pygame的安装

• windows 下推荐从
• linux 下安装pygame，不需要手动安装Videocapture
  

2.测试代码

import pygame.camera
import pygame.image
import syspygame.camera.init()cameras = pygame.camera.list_cameras()# print("Using camera %s ..." % cameras[0])
SIZE = (320, 240)
webcam = pygame.camera.Camera(cameras[0], SIZE)webcam.start()# grab first frame
img = webcam.get_image()WIDTH = img.get_width()
HEIGHT = img.get_height()screen = pygame.display.set_mode( ( WIDTH, HEIGHT ) )
pygame.display.set_caption("pyGame Camera View")while True :for e in pygame.event.get() :if e.type == pygame.QUIT :sys.exit()# draw framescreen.blit(img, (0,0))pygame.display.flip()# grab next frame    img = webcam.get_image()

3.kivy和pygame结合

# .kv 文件QrtestHome:
<QrtestHome>:qrcam: qrcamrecog_name: recog_nameBoxLayout:orientation: "vertical"canvas.before:Color:rgba: 0.584, 0.604, 0.608, 1Rectangle:size: self.sizepos: self.posLabel:height: 20size_hint_y: Nonetext: 'Video player'Label:canvas.before:Color:rgba:  [47 / 255., 167 / 255., 212 / 255., 1.]Rectangle:size: (self.width, self.height)pos: (self.x, self.y)size_hint_y: Noneheight: 1BoxLayout:orientation:"horizontal"KivyCamera:id: qrcamLabel:size_hint_x: Nonewidth: dp(2)canvas.before:Color:rgba: [47 / 255., 167 / 255., 212 / 255., 1.]Rectangle:size: (self.width, self.height)pos: (self.x, self.y)Label:canvas.before:Color:rgba: 0.208, 0.196, 0.196, 1Rectangle:size: (self.width, self.height)pos: (self.x, self.y)size_hint_x: 0.25id: recog_nametext: 'Recognizing'

1. 在QrtestHome的dostart函数中初始化并启动camera
2. 在KivyCamera的start函数中接受启动的camera对象capture，并启动schedule函数定时调用update函数
3. 在KivyCamera的update函数中获得frame图像并显示
   注意： KivyCamera， update函数中 texture.blit_buffer(frame)接受的是byte-like,所以要进行转换，具体的网站讨论

# Import 'kivy.core.text' must be called in entry point script
# before import of cv2 to initialize Kivy's text provider.
# This fixes crash on app exit.
from kivy.properties import ObjectProperty
import kivy.core.text
import cv2
from kivy.app import App
from kivy.base import EventLoop
from kivy.uix.image import Image
from kivy.clock import Clock
from kivy.graphics.texture import Texture
from kivy.uix.boxlayout import BoxLayout
from kivy.core.window import Window
import os
from kivy.uix.popup import Popup
from kivy.uix.label import Label# change code
import pygame.camera
import pygame.imageclass KivyCamera(Image):def __init__(self, **kwargs):super(KivyCamera, self).__init__(**kwargs)self.capture = Noneself.clock_event = None# 在KivyCamera的start函数中接受启动的camera对象capture，并启动schedule函数定时调用update函数def start(self, capture, fps=30):self.capture = captureself.clock_event = Clock.schedule_interval(self.update, 1.0 / fps)def stop(self):Clock.unschedule(self.clock_event)if self.capture != None:self.capture.release()# 在KivyCamera的update函数中获得frame图像并显示def update(self, dt):return_value = True frame = self.capture.get_image()frame = pygame.image.tostring(frame, 'RGB')if return_value:texture = self.texture# w, h = frame.shape[1], frame.shape[0]# if not texture or texture.width != w or texture.height != h:self.texture = texture = Texture.create(size=(320, 240))texture.flip_vertical()# texture.blit_buffer(frame.tobytes(), colorfmt='bgr')texture.blit_buffer(frame)self.canvas.ask_update()class QrtestHome(BoxLayout):capture = Nonerecog_name = ObjectProperty()# def change_racob_name(self, name_):#     self.recog_namedef dostart(self, *largs):# self.capture = cv2.VideoCapture(0)# self.capture.set(3, 320)# self.capture.set(4, 240)# 在QrtestHome的dostart函数中初始化并启动camerapygame.camera.init()cameras = pygame.camera.list_cameras()# print("Using camera %s ..." % cameras[0])SIZE = (320, 240)webcam = pygame.camera.Camera(cameras[0], SIZE)webcam.start()self.capture = webcamself.ids.qrcam.start(self.capture)def doexit(self):# global captureself.ids.qrcam.stop()if self.capture != None:# print(self.capture)self.capture.release()# print(self.capture)self.capture = Nonecv2.destroyAllWindows()# print(self.capture)#EventLoop.close()class FaceApp(App):homeWin = Nonedef build(self):#Window.clearcolor = (.4,.4,.4,1)Window.size = (800, 480)self.homeWin = QrtestHome()# homeWin.init_()return self.homeWindef on_start(self):self.homeWin.dostart()# def on_stop(self):#     global capture#     if capture:#         capture.release()#         capture = None
if __name__ == '__main__':FaceApp().run()