Filtering and image masking, Physics

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Regarding filtering, image masking & convolution. Assume we have the following Infra-Red image:

1776_FILTERING and image masking.png

 
What filter would you use to remove the impulsive noise in the first row of the image (assume 1 x 3 filter)?

What would the first row of the image be after filtering (assume 1 x 3 filter)?


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