如果对象移动得更远或更近，则OpenCV模板匹配不起作用

Question

我正在使用模板匹配但我更改图片距离程序不起作用

代码     ＃ - - 编码：cp1254 - -     导入cv2     导入numpy为np

cap = cv2.VideoCapture(0)
ret, frame = cap.read()

template = cv2.imread('template.jpg',0)
w, h = template.shape[::-1]
x,y = 0,0 

while(True): 
    ret, frame = cap.read() 
    i= cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) 

    res = cv2.matchTemplate(i,template,3) 
    min_val, max_val, min_loc, max_loc = cv2.minMaxLoc(res)
    top_left = max_loc 
    bottom_right = (top_left[0] + w, top_left[1] + h) 
    x = (top_left[0] + bottom_right[0])/2 
    y = (top_left[1] + bottom_right[1])/2

    #Draw Rectangle Match
    if x>0:
        p1=open('kn.txt','w')
        p1.write('p1')
        print "p1"
        p1.flush()
        p1.close()
        cv2.rectangle(frame, top_left, bottom_right, (255, 125, 125), 3)
        cv2.putText(frame, "["+ str(x)+","+str(y)+"]", (bottom_right[0]+10,bottom_right[1]+10), cv2.FONT_HERSHEY_SIMPLEX, 1, (255,125,0), 2)

    cv2.imshow('cikis',frame)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        cap.release()
        break

cv2.destroyAllWindows()

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