MeoWorkshop discusses the process to map each pixel in an image to an audible frequency. To accomplish this, a collection of unique frequencies of each pixel is summed, resulting in some waveform.
In trying to reduce the influence of uniform sections, I decided to use the difference in intensity between neighbouring pixels to calculate the magnitude instead of using pixel intensities directly.
For a given block, the intensity of each pixel’s RGB channel is subtracted with the intensities of the previous pixel. The resulting delta R, G and B vectors are then used to calculate the Euclidean distance. This process iterates over all the pixels in the block with the final magnitude being the max difference found.
Eink, E-paper, Think Ink – Collin shares six segments pondering the unusual low-power display technology that somehow still seems a bit sci-fi – http://adafruit.com/thinkink
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