File:Polarlicht 2 kmeans 8 small.png

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

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

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description

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
Other versions See gallery

Licensing

[edit]
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.

العربية ∙ беларуская (тарашкевіца) ∙ català ∙ čeština ∙ Deutsch ∙ English ∙ español ∙ eesti ∙ فارسی ∙ suomi ∙ français ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ മലയാളം ∙ မြန်မာဘာသာ ∙ norsk bokmål ∙ Plattdüütsch ∙ Nederlands ∙ polski ∙ português ∙ português do Brasil ∙ русский ∙ sicilianu ∙ slovenčina ∙ slovenščina ∙ српски / srpski ∙ svenska ∙ Türkçe ∙ українська ∙ Tiếng Việt ∙ 中文（简体） ∙ 中文（繁體） ∙ +/−

File history

Click on a date/time to view the file as it appeared at that time.

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

You cannot overwrite this file.

There are no pages that use this file.

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Polarlicht_2_kmeans_8_small.png&oldid=645047569"