README file for 'Guided Image Filter'. CONTENTS main.c Main processing file filter.c Filter inout.c Program to read and write PGM file INPUT FORM <guidance_image_filename>: PGM file <input_filtering_image_filename>: PGM file <local window radius>: r <regularization parameter>: eps <output_filename>: PGM file Note: the size of each local patch is N=(2r+1)^2 except for boundary pixels