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What is the difference between Convolution and Correlation?

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+2 votes
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in Digital Image Processing by (701k points)
What is the difference between Convolution and Correlation?

(a) Image is pre-rotated by 180 degree for Correlation

(b) Image is pre-rotated by 180 degree for Convolution

(c) Image is pre-rotated by 90 degree for Correlation

(d) Image is pre-rotated by 90 degree for Convolution

The question was asked during an interview.

The above asked question is from Fundamentals of Spatial Filtering in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

1 Answer

+1 vote
by (1.1m points)
The correct choice is (b) Image is pre-rotated by 180 degree for Convolution

To explain: Convolution is the same as Correlation except that the image must be rotated by 180 degrees initially.

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