Tutorial Laplace Operator

samples/python/tutorial_code/ImgTrans/LaPlace/laplace_demo.py

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+"""
+@file laplace_demo.py
+@brief Sample code showing how to detect edges using the Laplace operator
+"""
+import sys
+import cv2
+
+def main(argv):
+    # [variables]
+    # Declare the variables we are going to use
+    ddepth = cv2.CV_16S
+    kernel_size = 3
+    window_name = "Laplace Demo"
+    # [variables]
+
+    # [load]
+    imageName = argv[0] if len(argv) > 0 else "../data/lena.jpg"
+
+    src = cv2.imread(imageName, cv2.IMREAD_COLOR) # Load an image
+
+    # Check if image is loaded fine
+    if src is None:
+        print ('Error opening image')
+        print ('Program Arguments: [image_name -- default ../data/lena.jpg]')
+        return -1
+    # [load]
+
+    # [reduce_noise]
+    # Remove noise by blurring with a Gaussian filter
+    src = cv2.GaussianBlur(src, (3, 3), 0)
+    # [reduce_noise]
+
+    # [convert_to_gray]
+    # Convert the image to grayscale
+    src_gray = cv2.cvtColor(src, cv2.COLOR_BGR2GRAY)
+    # [convert_to_gray]
+
+    # Create Window
+    cv2.namedWindow(window_name, cv2.WINDOW_AUTOSIZE)
+
+    # [laplacian]
+    # Apply Laplace function
+    dst = cv2.Laplacian(src_gray, ddepth, kernel_size)
+    # [laplacian]
+
+    # [convert]
+    # converting back to uint8
+    abs_dst = cv2.convertScaleAbs(dst)
+    # [convert]
+
+    # [display]
+    cv2.imshow(window_name, abs_dst)
+    cv2.waitKey(0)
+    # [display]
+
+    return 0
+
+if __name__ == "__main__":
+    main(sys.argv[1:])