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POImage Compression Algorithm - Breaking an Image Into Squares By Color
 

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  1. POImage Compression Algorithm - Breaking an Image Into Squares By Color
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    <p>I'm trying to develop a mobile application, and I'm wondering the easiest way to convert an image into a text file, and then be able to recreate it later in memory said text. The image(s) in question will contain no more than 16 or so colors, so it would work out fine.</p> <p>Basically, brute-forcing this solution would require me saving each individual's pixel color data into a file. However, this would result in a HUGE file. <strong>I know there's a better way - like, if there's a huge portion of the image that consists of the same color, breaking up the area into smaller squares and rectangles and saving their coordinates and size to file.</strong></p> <p>Here's an example. The image is supposed to be just black/white. The big color boxes represent theoretical 'data points' in the outputted text file. These boxes would really state their origin, size, and what color they should be.</p> <p>E.g., top box has an origin of 0,0, a size of 359,48, and it represents the color black. Saved in a text file, the data would be 0,0,359,48,0.</p> <p><img src="https://i.stack.imgur.com/Y3wRM.png" alt="sample algorithm output"></p> <p>What kind of algorithm would this be?</p> <p>NOTE: The SDK that I am using cannot return a pixel's color from an X,Y coordinate. However, I can load external information into the program from a text file and manipulate it that way. This data that I need to export to a text file will be from a different utility that will have the capability to get a pixel's color from X,Y coordinates. </p> <p>EDIT: Added a picture EDIT2: Added constraints</p>
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    1. USJeffrey Kern
    1. USJeffrey Kern
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    1. COPNG or GIF? You do not need to reinvent image compression :)
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      1. POImage Compression Algorithm - Breaking an Image Into Squares By Color
      1. USLasse Espeholt
    2. COCould you elaborate on why you want to save an image (or its parts) as plain text? Can't you use a binary representation instead? Also, if images typically have lots of contiguous runs of pixels of same color, you may want to use the so-called run-length encoding (RLE). Alternatively, one of Lempel-Ziv-something compression algorithms could be used (LZ77, LZ78, LZW).
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      1. USAlexey Frunze
    3. COThe problem isn't the image itself - it's the SDK I am using. There is no way that I can get a certain pixel's color from the image itself within the SDK. Thus, I need to come up with a solution that would convert said data to a text file that I could load up into the app and manipulate.
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      1. POImage Compression Algorithm - Breaking an Image Into Squares By Color
      1. USJeffrey Kern
 

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