Create binarize_3methods.py

examples/binarize_3methods.py

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+"""
+How to binarize a grayscale image
+This program shows you how to use the three methods.
+1. Simple thresholding
+2. Per-pixel thresholding
+3. Posi-Nega comparing
+"""
+import numpy as np
+import structuredlight as sl
+
+def main():
+    width  = 640
+    height = 480
+
+    gray = sl.Gray()
+
+    imlist_pattern = gray.generate((width, height))
+
+    print("1. Simple thresholding")
+    img_index = gray.decode(imlist_pattern, thresh=127)
+
+    print("2. Per-pixel thresholding")
+    img_white = np.full((height, width), 255, dtype=np.uint8)
+    img_black = np.full((height, width),  0 , dtype=np.uint8)
+    img_thresh = 0.5*img_white + 0.5*img_black
+    img_index = gray.decode(imlist_pattern, thresh=img_thresh)
+
+    print("3. Posi-Nega comparing")
+    imlist_posi = imlist_pattern
+    imlist_nega = sl.invert(imlist_posi)
+    img_index = gray.decode(imlist_posi, imlist_nega)
+
+if __name__=="__main__":
+    main()