Seam Curving using CUDA

loadpng.cpp & loadpng.h are copied from a light weighted PNG load/save library: https://github.com/lvandeve/lodepng

Require CUDA verion >= 9 and Nvidia Pascal or newer GPU structures (tested on GTX1080 with CUDA 10.0)

Simply type "make" to compile and generate an executabe "sc"

Usage: sc file : specify input png file, mandatory -w int : specify target output width, optional -h int : specify target output height, optional -o file : specify target output file, optional (default to be input_file_name.out) -cuda : whether to use cuda, optional (without this flag, will use sequential version on CPU)

Example: sc sample.png -w 100 -h 100 -o sample.out.png -cuda

Note: sequential version and cuda version generates exactly the same output (tested via shasum). The only difference is the speed.