Need Help regarding Applying Filter in frequency domain

2013 8 20
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I have a filter H (coefficients in 2D) and is in frequency domain have to apply this filter to an image which is in spatial domain
What can I do ?
If I also change the image to frequency domain the how can I multiply the filter with Image ?
Can I change the filter to spatial domain then convolve with Image ? but how to change to spatial domain ?
need suggestions and help
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