Spectral Distance - Speed Scoring - MATLAB Cody - MATLAB Central

Problem 850. Spectral Distance - Speed Scoring

Difficulty:
(15)
Rate
Find quantity of pixels within a spectral distance from a given [r,g,b] spectra.
Spectral distance = sqrt( (r0-ri)^2+(g0-gi)^2+(b0-bi)^2) where [r0,g0,b0] is the target spectra (0:255) and [ri,gi,bi] are from an image pixel.
Two warm-up timing prep runs will be executed against a 512x512 sub-section.
Timing run will be against a 2036x3060 image : concordaerial.png
A second test will select a random point in a small window to confirm accuracy. Unfortunately bwdist does not appear to work in Cody.
Ranking will be based upon speed. Accuracy is still required.
Input: [image array, spectra, threshold distance]
image array [ x, y, 3 ] % Higher order images is a future activity
spectra [ r g b]
Output: [ N ] number of pixels within(<=) threshold distance
Pixel count tolerance of 1% is allowed
The right to update the test points/thresholds is reserved in case of shenanigans.
Solve

Solution Stats

27.66% Correct | 72.34% Incorrect
Last Solution submitted on Oct 07, 2023

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers10

Suggested Problems

More from this Author308

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!
Go to top of page