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I would like to do crude edge detection. Which of the following techniques would be faster/more computationally efficient?

Technique 1:

• GaussianBlur() image with kernel 5,5.
• GaussianBlur() image with kernel 11,11.

• Subtract the 2 images

  • Benefits of this technique; less noise/eliminates smaller/weaker edges. Anything else?
  • Cons of this technique; less accurate

Technique 2:

• Sobel() image to get horizontal edges
• Sobel() image to get vertical edges

• magnitude() to get edge strengths

  • Benefits of this technique; more accurate
  • Cons of this technique; more noise/shows weaker edges