imfilter at single point

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socter
socter 2016-9-24
回答： Image Analyst 2016-9-24
Lets suppose you have an image and a filter of the same size. I want to know how to find the filtered value of the midpoint of the image without filtering the rest of the image.
I am currently using imfilter and then using the midpoint of the output. This is obviously computationally expensive, so if there is a way to circumvent this, please let me know!
Thanks

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Image Analyst
Image Analyst 2016-9-24
Just multiply and add. Something like (untested)
productImage = double(grayImage) .* filterImage;
centerValue = sum(productImage(:));

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