Added Image Processing folder and first assignment.

improc/ass1/lowcontrast.py

+from pylab import clf, histogram, np, imshow
+
+def cst(f):
+    fmin = amin(f)
+    fmax = amax(f)
+    return (f - fmin) / (fmax - fmin)
+
+a = np.load('lowcontrast.npy')
+clf()
+imshow(a, vmin=0, vmax=1)
+h, be = histogram(a.flatten(), bins=40)
+