覆盆子Pi Omxplayer OpenCV

Question

嗨，我正在尝试改进自己，我对树莓派感兴趣。我想开发一个学生项目与覆盆子皮，覆盆子皮相机和tft屏幕。它包括，当raspi摄像机检测到一张脸时，显示一部电影，而不检测到任何面部显示另一部电影。我写了如下代码。我使用了python opencv omxplayer库。当我运行代码时，如果没有检测到人脸，就没有播放视频，但是如果检测到了脸，视频就会非常严重地打开和关闭，视频不会出现，只有黑影会很快出现在屏幕上。谢谢你帮忙。问候

from picamera.array import PiRGBArray
from picamera import PiCamera
import time
import cv2
import os
import numpy
from subprocess import Popen

#setup movies
movie1 = ("my_movie1_path")
movie2 = ("my_movie2_path")

camera = PiCamera()
camera.resolution = ( 320, 240 )
camera.framerate = 60
rawCapture = PiRGBArray( camera, size=( 320, 240 ) )

# Load a cascade file for detecting faces
face_cascade = cv2.CascadeClassifier( 'my_path/lbpcascade_frontalface.xml' )

t_start = time.time()
fps = 0

# Capture frames from the camera

for frame in camera.capture_continuous( rawCapture, format="bgr", use_video_port=True ):

  image = frame.array

# Use the cascade file we loaded to detect faces
  gray = cv2.cvtColor( image, cv2.COLOR_BGR2GRAY )
  faces = face_cascade.detectMultiScale( gray )
  print "1"
  While True:
     if len( faces ) > 0 :
        os.system('killall omxplayer.bin')
        omcx = Popen(['omxplayer', '-b', movie2])
     else :
        os.system('killall omxplayer.bin')
        omcx = Popen(['omxplayer', '-b', movie1])


  #print "Found " + str( len( faces ) ) + " face(s)"
   print "2"

   rawCapture.truncate( 0 )

Answer 1

这里的问题是在时间指令内。当程序在while循环中检测到一张脸时。在这里，程序继续杀死omxplayer并启动电影。

尝试删除while循环并查看代码是否有效。