It's really cool that Poisson disc sampling is used to generate the points. Here, best-candidate sampling is used, based on [1]. But have you considered using the possibly faster Bridson's algorithm [2]?

Using Harris corners to analyze the picture is a cool idea too. Good job!

[1] http://bl.ocks.org/mbostock/b17e0b2aa8b2d50de465 [2] https://www.jasondavies.com/poisson-disc/