Exercise

Defining image convolution kernels

In the previous exercise, you wrote code that performs a convolution given an image and a kernel. This code is now stored in a function called convolution() that takes two inputs: image and kernel and produces the convolved image. In this exercise, you will be asked to define the kernel that finds a particular feature in the image.

For example, the following kernel finds a vertical line in images: 

np.array([[-1, 1, -1], 
          [-1, 1, -1], 
          [-1, 1, -1]])

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Define a kernel that finds horizontal lines in images.