Showing that the image of a subspace under a transformation is also a subspace. This video was filmed and edited by Sean Riley.Ĭomputer Science at the University of Nottingham: 🤍Ĭomputerphile is a sister project to Brady Haran's Numberphile. Imwrite(imout - 1, colormap, 'C:\Path\Of\Output\Image.png') % stored in the file the values should go from 0-255, not 1-256 like matlab % Save file out, you need to subtract 1 from the image classes, since once Imout = reshape(uint8(kIDs), size(im,1), size(im,2)) % Reshape kIDs back into the original image shape This array is kC, and kIDs areĬolormap = kC / 256 % Scale 0-1, since this is what matlab wants % colours are stored in a separate array. % Matlab can output paletted images, that is, grayscale images where the = kmeans(imflat, K, 'Display', 'iter', 'MaxIter', 150, 'Start', 'sample') For large K, it's unlikely that we will ever reach zero movement % number should get lower and lower, as the means settle on appropriate % number of pixels that have changed class since last iteration. % While KMeans is running, it will show you the iteration count, and the % is large, I've used the sampling start strategy to speed things up. This can take a long time if the value for K % pixel, and in this case we also want the mean values for each class. This function returns the class IDs assigned to each % Kmeans takes a long time if you are using 256 classes. % random, rather than anything complex like kmeans initialisation. % I specify that initialisation shuold sample points at Imflat = double(reshape(im, size(im,1) * size(im,2), 3)) % We also cast to a double array, because K-means requires it in matlab % the image into this format, where each pixel is one row, and R,G and B
% In matlab, K-means operates on a 2D array, where each sample is one row, Im = imread('C:\Path\Of\Input\Image.jpg') % one (or, like me, work for an organisation that does) try Octave as a Matlab licenses are pricey, if you don't have I chose matlab because it's a popular tool for % This script is the one mentioned during the Computerphile Image
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