Paramètre d'entré



In [1]:

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

filename = '/home/glagasse/Developpement/Projects/Python/Logo/logoconcept.jpg'
img = cv2.imread(filename, 1)
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

gray = np.float32(gray)
dst = cv2.cornerHarris(gray,2,3,0.04)

#result is dilated for marking the corners, not important
dst = cv2.dilate(dst,None)

# Threshold for an optimal value, it may vary depending on the image.
img[dst>0.01*dst.max()]=[0,0,255]

Fonction affichage de l'image



In [2]:

    
def Image_Show(img):

    b,g,r = cv2.split(img)       
    rgb_img = cv2.merge([r,g,b])     

    plt.imshow(rgb_img)
    plt.xticks([]), plt.yticks([])   
    plt.show()

Division



In [3]:

    
laplacian = cv2.Laplacian(img,cv2.CV_64F)
sobelx = cv2.Sobel(img,cv2.CV_64F,1,0,ksize=3)
sobely = cv2.Sobel(img,cv2.CV_64F,0,1,ksize=3)

plt.subplot(2,2,1)
plt.imshow(img)
plt.title('Original') 
plt.subplot(2,2,2)
plt.imshow(sobelx)
plt.title('SobelX')
plt.subplot(2,2,3)
plt.imshow(sobely)
plt.title('SobelY')
plt.subplot(2,2,4)
plt.imshow(laplacian)
plt.title('Laplacian')
plt.show()



In [4]:

    
Image_Show(img)
Image_Show(sobelx)
Image_Show(sobely)
Image_Show(laplacian)

Normalisation et histogramme



In [5]:

    
hist,bins = np.histogram(img.flatten(),256,[0,256])

cdf = hist.cumsum()
cdf_normalized = cdf * hist.max()/ cdf.max()

plt.plot(cdf_normalized, color = 'b')
plt.hist(img.flatten(),256,[0,256], color = 'r')
plt.xlim([0,256])
plt.legend(('cdf','histogram'), loc = 'upper left')
plt.show()



In [6]:

    
Hist_R = cv2.calcHist(img, [0], None, [256],[0,256])
Hist_G = cv2.calcHist(img, [1], None, [256],[0,256])
Hist_B = cv2.calcHist(img, [2], None, [256],[0,256])

Contour



In [15]:

    
imgray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
ret,thresh = cv2.threshold(imgray,5,255,0)
image, contours, hierarchy = cv2.findContours(thresh) # ,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)









    



---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-15-8f10e5fcceed> in <module>()
      1 imgray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
      2 ret,thresh = cv2.threshold(imgray,5,255,0)
----> 3 image, contours, hierarchy = cv2.findContours(thresh) # ,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)

TypeError: Required argument 'mode' (pos 2) not found



In [14]:

    
plt.imshow(thresh)
plt.show()



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