opencv實現用的Camshift穿線不工作

Question

我試圖運行的OpenCV /樣品/ python2使用threads.I've創建了兩個對象進行調用run方法應用（）類提供代碼的Camshift。

## 
from threading import Thread 
from multiprocessing import Process 
import numpy as np 
import cv2 
import video 


class App(object): 
    def __init__(self, video_src): 
     self.cam = video.create_capture(video_src) 
     ret, self.frame = self.cam.read() 
     cv2.namedWindow('camshift') 
     cv2.setMouseCallback('camshift', self.onmouse) 

      self.selection = None 
      self.drag_start = None 
      self.tracking_state = 0 
      self.show_backproj = False 

    def onmouse(self, event, x, y, flags, param): 
     x, y = np.int16([x, y]) # BUG 
     if event == cv2.EVENT_LBUTTONDOWN: 
       self.drag_start = (x, y) 
       self.tracking_state = 0 
     if self.drag_start: 
       if flags & cv2.EVENT_FLAG_LBUTTON: 
        h, w = self.frame.shape[:2] 
        xo, yo = self.drag_start 
        x0, y0 = np.maximum(0, np.minimum([xo, yo], [x, y])) 
        x1, y1 = np.minimum([w, h], np.maximum([xo, yo], [x, y])) 
        self.selection = None 
        if x1-x0 > 0 and y1-y0 > 0: 
         self.selection = (x0, y0, x1, y1) 
      else: 
        self.drag_start = None 
        if self.selection is not None: 
         self.tracking_state = 1 

    def show_hist(self): 
     bin_count = self.hist.shape[0] 
     bin_w = 24 
     img = np.zeros((256, bin_count*bin_w, 3), np.uint8) 
     for i in xrange(bin_count): 
      h = int(self.hist[i]) 
      cv2.rectangle(img, (i*bin_w+2, 255), ((i+1)*bin_w-2, 255-h),     (int(180.0*i/bin_count), 255, 255), -1) 
     img = cv2.cvtColor(img, cv2.COLOR_HSV2BGR) 
     cv2.imshow('hist', img) 

    def run(self): 
    while True: 
     ret, self.frame = self.cam.read() 
     vis = self.frame.copy() 
     hsv = cv2.cvtColor(self.frame, cv2.COLOR_BGR2HSV) 
     mask = cv2.inRange(hsv, np.array((0., 60., 32.)), np.array((180., 255., 255.))) 

     if self.selection: 
      x0, y0, x1, y1 = self.selection 
      self.track_window = (x0, y0, x1-x0, y1-y0) 
      hsv_roi = hsv[y0:y1, x0:x1] 
      mask_roi = mask[y0:y1, x0:x1] 
      hist = cv2.calcHist([hsv_roi], [0], mask_roi, [16], [0, 180]) 
      cv2.normalize(hist, hist, 0, 255, cv2.NORM_MINMAX); 
      self.hist = hist.reshape(-1) 
      #self.show_hist() 
      vis_roi = vis[y0:y1, x0:x1] 

      cv2.bitwise_not(vis_roi, vis_roi) 
      vis[mask == 0] = 0 

     if self.tracking_state == 1: 
      self.selection = None 
      prob = cv2.calcBackProject([hsv], [0], self.hist, [0, 180], 1) 
      prob &= mask 
      term_crit = (cv2.TERM_CRITERIA_EPS | cv2.TERM_CRITERIA_COUNT, 10, 1) 
      track_box, self.track_window = cv2.CamShift(prob, self.track_window, term_crit) 
      print track_box[0] 
      if self.show_backproj: 
       vis[:] = prob[...,np.newaxis] 
      try: cv2.ellipse(vis, track_box, (0, 0, 255), 2) 
      except: print track_box 

     cv2.imshow('camshift', vis) 

     ch = 0xFF & cv2.waitKey(5) 
     if ch == 27: 
      break 
     if ch == ord('b'): 
      self.show_backproj = not self.show_backproj 
    cv2.destroyAllWindows() 


if __name__ == '__main__': 
    import sys 
    try: video_src = sys.argv[1] 
    except: video_src = 0 
    print __doc__ 
    left=App(1)# 1=device id for left camera 
    right=App(2)#2=device id for right camera 
    threadLeft=Process(target=left.run()) 
    threadRight=Process(target=right.run()) 
    threadRight.start() 
    threadLeft.start() 

在執行時，兩個窗口出現一個右等爲left.However的onmouse（）當我拖動鼠標在任一windows.Seems的不會被調用的Windows freeze.Following在關閉其中任何一個窗口時，我先前在窗口上跟蹤任何對象的模式會自動用於第二個未關閉的窗口。

那麼，有沒有用，我可以調用此代碼爲我的兩個攝像頭的。任何幫助，任何其他方法appreciated.Thanks

Answer 1

創建一個進程，給一個函數target。在上面的代碼中，left.run()是執行的，未傳遞給進程。

更改碼本：

threadLeft = Process(target=left.run) 
threadRight = Process(target=right.run)