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applying an image filtering technique on 'selected' pixels

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leila
leila on 9 May 2012
Hi,
The feature extraction step of my algorithm, applies some filter on data and use the value of filtered pixels as the feature of original pixels of image.
My problem is that I need the feature of only small subset of pixels(threshold-ed pixels), not all of the image. and it is time consuming to filter all of the image, instead of only some pixels.
My question is how can I filter only selected pixels of an image? Is there any matlab function for this purpose?(I think I can not use imfilter)
Thank you.

Answers (1)

Image Analyst
Image Analyst on 9 May 2012
How time consuming is it? Give me a time in seconds. Cropping out all the small regions to their own subimages and then filtering, and then sending them back is one option but it may not be any faster.
  10 Comments
leila
leila on 10 May 2012
Thank you for excellent guidance, your comments help me a lot.

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