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FAST or AGAST on Color Images

I want to detect tiny dark points/dots in a color image.
Is there an easy way to get FAST and/or AGAST to measure the score as the difference between the min-of-channels in the center p and the max-of-channels in the points around each center?

FAST or AGAST on Color Images

I want to detect tiny dark points/dots in a color image.
Is there an easy way to get FAST and/or AGAST to measure the score as the difference between the min-of-channels in the center p and the max-of-channels in the points around each center?

If this is not possible with the current API, how would one change FAST or AGAST to accept 2 images, one for the center and one for the outline?

FAST or AGAST on Color Images

I want to detect tiny dark points/dots in a color image.
Is there an easy way to get FAST and/or AGAST to measure the score as the difference between the min-of-channels in the center p and the max-of-channels in the points around each center?

If this is not possible with the current API, how would one change FAST or AGAST to accept 2 images, one for the center and one for the outline?

Here's an example. It has two darker faint spots:
image description

The background is also noisy (and even more in other cases).
FAST and AGAST can actually detect the spot closer to the center, but the one on the bottom-right corner cannot be detected without detecting a lot of noise.

Since FAST/AGAST work only on gray-scale images, it would be a great addition if we could use 2 inputs, one for the center-pixel and one for the surrounding pixels.