Determines and identifies all prominent edges within a PNG image.
1] Initial image.
2] Applying Gaussian blur.
3] Edge maginitude and direction calculation.
4] Edge angle comparison.
5] 82% edge magnitude thresholding.
6] Edge identification at 25px edge length thresholding. Individual edges are displayed by color.
Uses LodePNG [lodepng.cpp, lodepng.h] by Lode Vandevenne to complete the PNG image conversion.