Fast concolution of image and ellipse of varid sizes

Hi, I'm currently trying to figure out how to make fast convolution between an image (2000x1600 pixels) and a much smaller ellipse mask of different sizes. Im using conv2 fucntion but its taking forever. Surely there must be a more simpler and faster way?

The ellipse might vary between 40-150 pixels in size or in some cases larger up to maybe 600 pixels.

I like to make convolution between the two images (the image and my ellipse mask) and optimize the speed. The image is mostly "zero" and consist of a laser lobe of varid sizes.

Answer 1

[Bruno Luong]

You might try this FEX file.

[Bruno Luong]

Some possible further optimization: If you convolve the same image with different ellipses or the opposite: different image with the same set of ellipses the FFT of what ever image that is used multiple time can be computed once.