File:Polarlicht 2 kmeans 8 small.png

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Polarlicht_2_kmeans_8_small.png ‎(376 × 245 pixels, file size: 9 KB, MIME type: image/png)

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File:Polarlicht 2.jpg reduced to 8 colors using the k-means algorithm. Implemented in MATLAB in a similar manner as File:Polarlicht 2 kmeans 8 large.png, except at the last step, the image that k-means was actually run on is used for assigning the colors.

  1. Read in source image.
  2. Convert to 3-dimensional matrix of [y-value, x-value, rgb] using imread. Each entry is an integer between 0 and 255 representing the value of the color indicated by rgb at (x, y).
  3. Reduce linear resolution 8 times by averaging the values in each 8x8 matrix block (for faster processing).
  4. Run k-means (self-implemented) for 20 iterations with k = 8, obtaining 8 colors which are the centroids of each cluster.
  5. For each pixel in the original image, replace its value with the closest color based on Euclidean norm of RGB.
Note: Please do not convert this to a JPEG. It must remain in a lossless format to preserve the integrity of the RGB values. Also do not delete this as a scaled-down duplicate of File:Polarlicht 2 kmeans 8 large.png; the manner in which it is a smaller version of that image is important to the purpose of the image.
Date
Source Own work
Author Senior Airman Joshua Strang, derivative work by King of Hearts
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Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
In some countries this may not be legally possible; if so:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
Public domain
This image or file is a work of a U.S. Air Force Airman or employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image or file is in the public domain in the United States.

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Date/TimeThumbnailDimensionsUserComment
current20:50, 20 November 2012Thumbnail for version as of 20:50, 20 November 2012376 × 245 (9 KB)King of Hearts (talk | contribs)VicuñaUploader 1.16

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