Question

下面的代码遍历出队（双端队列）中存储的一组点。

import numpy as np

pts1_blue=[(230,50),(100,200),.....] #this is just example values of the centroids

for i in range(1, len(pts1_blue)):
  
    # if either of the tracked points are None, ignore
    # them
  if pts1_blue[i - 1] is None or pts1_blue[i] is None:
    
      continue
 #  # otherwise, compute the thickness of the line and
    # draw the connecting lines
  if len(pts1_blue)>=10: 
   if counter_blue_1 >= 10 and i == 1 and pts1_blue[-10] is not None:
        
        # compute the difference between the x and y
        # coordinates and re-initialize the direction
        # text variables
        dX_blue = pts1_blue[-10][0] - pts1_blue[i][0]
        dY_blue = pts1_blue[-10][1] - pts1_blue[i][1]
        
        
       # print('DXX',dX_blue)
        (dirX_blue, dirY_blue) = ("", "")
        # ensure there is significant movement in the
        # x-direction
        if np.abs(dX_blue) > 20:
           #   print('DXXXX_blue',dX_blue)
              dirX_blue = "North" if np.sign(dX_blue) == 1 else "South"
        # ensure there is significant movement in the
        # y-direction
        if np.abs(dY_blue) > 20:
              dirY_blue = "East" if np.sign(dY_blue) == 1 else "West"
        # handle when both directions are non-empty
        if dirX_blue != "" and dirY_blue != "":
            # direction_blue = "{}-{}".format(dirY_blue, dirX_blue)
        # otherwise, only one direction is non-empty
       # else:
         direction_blue = dirX_blue if np.abs(dirX_blue) > np.abs(dirY_blue) else dirY_blue

这些点代表不同帧中检测到的小型汽车的质心。我正在使用这些中心坐标来计算当前帧的y和y坐标与缓冲区后面的帧（它们之间的10帧距离）之间的差，并根据增量的符号对方向进行分类。但是，我需要我的代码通过选择大于另一个的增量来处理dx和dy都不为零的情况。当我运行代码时，它返回以下错误：

 direction_blue = dirX_blue if np.abs(dirX_blue) > np.abs(dirY_blue) else dirY_blue

 UFuncTypeError: ufunc 'absolute' did not contain a loop with signature matching types dtype('<U5') - 
 > dtype('<U5')

我在帖子中发现了相同的错误，但是无法解释我的情况，因此，我将感谢您的帮助。

注意：方向为南北西向和东向。 dx和dy都不为零的情况是汽车在对角线行驶时，但是我想根据最大变化量对该方向进行分类

预先感谢哈立德

UFuncTypeError：ufunc'absolute'不包含签名匹配类型为dtype（'<U5'）-> dtype（'<U5'）的循环

0 个答案: