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Let us follow the following steps to understand how a convolution operator works. The steps to be followed are:
Open the Repeat the Form a theory of why
earlier link previous activity it is happening
If YES, Change the
BRAVO picture If NO
Change the position
Were you of numbers and
correct? check your theory
Now, try changing the values in the convolution operator and observe the modifications in the output image with
the following criteria:
• Change all values in the convolution matrix to positive values:
What did you observe?
The output image will likely become brighter. Since all values are positive, it enhances the features in the image
by increasing their intensity. No edges or details are emphasised.
• Change all values in the convolution matrix to negative numbers.
What did you observe?
The result will be the opposite of the positive values. The image may darken or show an inverse effect. Negative
values tend to blur or edge-detect the image, creating darker or more shadowed areas.
• Create a convolution matrix that includes both positive and negative values, for example:
Computer Vision (Practical) 349

