How can I represent my image pixel values inside a HSV cone

Hello,

I'm trying to develop a colour model for fire in HSV colour space.I have a million sample pixels per channel for the HSV colour space. I want to represent these samples inside the HSV cone to get an idea of how they are distributed. Any thoughts or suggestions on how i could possibly proceed with this? Thanks in anticipation.

Answer 1

[Image Analyst]

See my attempt at doing it in MATLAB attached below in blue.

A better option is to use the Java code that was originally written for ImageJ but can be called from MATLAB. See my code samples in http://www.mathworks.com/matlabcentral/answers/?search_submit=answers&query=color-inspector&term=color-inspector

[Omair]

I've visualized and managed to 'carve' out the gamut in RGB color space. However as part of my analysis I want to visualize it in the HSV cone as well.

I initially used polar plot command to plot Hue and Saturation. It seems to make sense to me but I'm not sure if it is correct.

I followed this post ( http://www.mathworks.de/matlabcentral/answers/84068-lab-vs-rgb-vs-hsv-color-spaces-for-color-detection ) earlier and installed ImageJ but i can't figure out how to import my data set into ImageJ. It's not an image, just a million by 3 matrix of HSV values.

[Image Analyst]

Just create any image. Like (untested)

k = 1;
for row = 1 : 1000
  for col = 1 : 1000
    hsvImage(row, col, 1) = hsv(k, 1);
    hsvImage(row, col, 2) = hsv(k, 2);
    hsvImage(row, col, 3) = hsv(k, 3);
    k = k + 1;
  end
end
% Now convert that to an RGB image
rgbImage = hsv2rgb(hsvImage);
imwrite(rgbImage, fullFileName);

Then import it into the Color Inspector and view the gamut as HSV.

[Omair]

Thanks. That worked like a charm. I should have thought of that sooner.

Answer 2

[Bjorn Gustavsson]

Simply use scatter3?

[Omair]

I tried scatter3 but since the circular nature of the HSV colour space isn't taken into account the results are not adequate for my needs.