initial commit

compression.py

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+# -*- coding: utf-8 -*-
+import matplotlib.pyplot as plt
+import numpy as np
+
+
+
+
+#import image
+imCol = plt.imread("mini.jpg", format=None)
+imNb = 1/3 * imCol[:,:,0]+  1/3 * imCol[:,:,1] + 1/3 * imCol[:,:,2];
+
+#R
+
+# compress
+iterationsGlobales = 5 
+iterations = 20
+
+imComp = imNb
+FF= [[]]*len(imComp[:,0])
+GG= [[]]*len(imComp[0,:])
+
+for x in range(iterationsGlobales):
+    F=np.ones((len(imComp[:,0]), 1))
+    G=np.ones((len(imComp[0,:]), 1))
+    for y in range(iterations):
+        F = np.dot(imComp, G)               / np.dot(np.transpose(G), G)
+        G = np.dot(np.transpose(imComp), F) / np.dot(np.transpose(F), F)
+    FF = np.append(FF, F, 1)
+    GG = np.append(GG, G, 1)
+    
+    
+    
+    imComp = imComp - np.dot(F,np.transpose(G))
+    
+
+imRecons = np.dot(FF,np.transpose(GG))
+#imRecons = np.dot(FF[:,None],GG[None,:])
+
+plt.figure(dpi=1200)
+
+
+plt.subplot(1, 3, 1)
+plt.axis('off')
+
+plt.title("Image importée", fontdict=None, loc='center', pad=None)
+plt.imshow(imNb, interpolation = "nearest", cmap = 'gray')
+
+
+plt.subplot(1, 3, 2)
+plt.axis('off')
+plt.title("Erreur", fontdict=None, loc='center', pad=None)
+plt.imshow(np.dot(F,np.transpose(G)), interpolation = "nearest", cmap = 'gray')
+
+
+plt.subplot(1, 3, 3)
+plt.axis('off')
+plt.title("Image compressée", fontdict=None, loc='center', pad=None)
+plt.imshow(imRecons, interpolation = "nearest", cmap = 'gray')
+plt.show()