Great demo. Out of curiosity, why not compiling the C algorithm with emcc into asm.js and probably get better performances (but a much larger js file) ?
Regarding compiling C using emscripten, I wanted a pure JS implementation so that it was hackable using Chrome Developer tools, E.g. using LAB data internally produced by SLIC algorithm. Hopefully in future, I will use a emscripten implementation. It might be important for version that proceses short gifs or videos.
Also there is a developer mode on top right, enabling it allows visualization of superpixels and change parameters of the algorithm.
