Counting the number of stars in a picture of the sky at night by grayscaling an image,
then when a bright pixel is encountered, look around that pixel to see if it's darker,
then it's assumed that that is a star. It could be unreliable if there are a bunch of
stars with different shapes.
Notice in the original image that there was some light pollution that would affect the filter.
Using a gaussian filter (big help) and some "denoise" setting made the image much easier to process
and my results would be more accurate.
These images are pretty hard to see, so apologies for that.
Original image:
Image with gaussian filter and "denoised":
