KNN train（）in cv2 with opencv 3.0

Question

我正在尝试使用cv2（python 2.7）和opencv 3.0运行k最近邻居。我使用像http://docs.opencv.org/3.0-beta/doc/py_tutorials/py_ml/py_knn/py_knn_understanding/py_knn_understanding.html这样的代码复制了相同的错误消息：

import cv2
import numpy as np
import matplotlib.pyplot as plt
# Feature set containing (x,y) values of 25 known/training data
trainData = np.random.randint(0,100,(25,2)).astype(np.float32)
# Labels each one either Red or Blue with numbers 0 and 1
responses = np.random.randint(0,2,(25,1)).astype(np.float32)
# Take Red families and plot them
red = trainData[responses.ravel()==0]
plt.scatter(red[:,0],red[:,1],80,'r','^')
# Take Blue families and plot them
blue = trainData[responses.ravel()==1]
plt.scatter(blue[:,0],blue[:,1],80,'b','s')
plt.show()
newcomer = np.random.randint(0,100,(1,2)).astype(np.float32)
plt.scatter(newcomer[:,0],newcomer[:,1],80,'g','o')

#The following line is modified for OpenCV 3.0
knn = cv2.ml.KNearest_create()
knn.train(trainData,responses)
ret, results, neighbours ,dist = knn.find_nearest(newcomer, 3)

print "result: ", results,"\n"
print "neighbours: ", neighbours,"\n"
print "distance: ", dist

plt.show()

我为OpenCV 3修改了行knn = cv2.ml.KNearest_create（），但后续行产生错误“TypeError：只有长度为1的数组可以转换为Python标量”而且我无法弄清楚我应该是什么用于火车功能。

Answer 1

你为KNN算法传递了错误的数组长度....看了你的代码，我发现你错过了knn.train函数中的cv2.ml.ROW_SAMPLE参数，传递此参数认为数组的长度为1表示整个行。因此您的更正代码如下：

import cv2
import numpy as np
import matplotlib.pyplot as plt

trainData = np.random.randint(0,100,(51,2)).astype(np.float32)
responses = np.random.randint(0,2,(51,1)).astype(np.float32)

red = trainData[responses.ravel()==0]
plt.scatter(red[:,0],red[:,1],80,'r','^')
blue = trainData[responses.ravel()==1]
plt.scatter(blue[:,0],blue[:,1],80,'b','s')


newcomer = np.random.randint(0,100,(5,2)).astype(np.float32)
plt.scatter(newcomer[:,0],newcomer[:,1],80,'g','o')

knn = cv2.ml.KNearest_create()
knn.train(trainData,cv2.ml.ROW_SAMPLE,responses)
ret, results, neighbours, dist = knn.findNearest(newcomer, 3)

print ("results: ", results,"\n")
print ("neighbours: ", neighbours,"\n")
print ("distances: ", dist)

plt.show()

这是我从中得到的结果....