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Step 2 Scroll down the page to locate the section where the
Convolution Matrix is applied to an image.
You'll see an image with an overlay of a convolution kernel
(matrix) and how it affects the image when applied.
Step 3 Click on the Choose File button.
The Open dialog box appears.
Step 4 Select the location where image is stored.
Step 5 Select the image for an image kernel and click of the Open
button. The image is uploaded.
Step 6 Click on the drop-down list to select the predefined effect.
Step 7 Select the effect that you want to apply to the image from the drop-down list. The value of the effect
is displayed in the matrix form.
Step 8 Try changing the values in the convolution operator and observe the modifications in the output image.
Sharpen Effect Blur Effect
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 If NO
BRAVO picture
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.
Computer Vision 215

