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import cv2                             
import matplotlib.pyplot as plt                     # Import modules
%matplotlib inline
import numpy as np

IMG= cv2.imread('Ngapali.jpg')                      # read the image 
IMG=cv2.cvtColor(IMG, cv2.COLOR_BGR2RGB)

                                                    # aply the classifier
Cascade = cv2.CascadeClassifier('_02_cascade_05_1000_625_19stages.xml')
Objects = Cascade.detectMultiScale(IMG)          

IMG2= cv2.imread('Ngapali.jpg')                     # read the image in second var
IMG2 = cv2.cvtColor(IMG2,cv2.COLOR_BGR2RGB)         # to mark the found objects on it

centres=[]
Radi=[]                                             # draw a rectangle around detected Objects
for (x, y, w, h) in Objects:                        
    cv2.rectangle(IMG2, (x, y), (x+w, y+h), (0, 255, 0), 2)
    centres.append( (int(x+w/2.),int(y+h/2.) ) )    # calculate centerpoints
    Radi.append( np.sqrt((w/2.)**2+(h/2.)**2 ))     # calculate radius
                
plt.figure(figsize=(20,10))                         # show the result
plt.imshow(IMG2,cmap='gray')    
plt.show()

print ' {} foram objekts detected'.format(len(Objects))