Copyright (c) 2021 Yiming Lin
Implementation of color-to-grayscale image conversion algorithms proposed in the following papers:
spcr.py implements "Color2Gray: Salience-Preserving Color Removal. Amy A. Gooch, Sven C. Olsen, Jack Tumblin, and Bruce Gooch. SIGGRAPH 05"
Argument:
--intput: specify the path to the input color image
--output: specify the path to the output grayscale image
--mu: specify the width (actual width is 2 * mu) of the squared neighborhood pixel patch
--npi and --dpi: specify user parameter theta by npi times pi / dpi
--alpha: specify user parameter alpha
ngm.py implements "Robust color-to-gray via nonlinear global mapping. Yongjin Kim and Cheolhun Jang and Julien Demouth and Seungyong Lee. SIGGRAPH ASIA 2009"
Argument:
--intput: specify the path to the input color image
--output: specify the path to the output grayscale image
--dof: degree of trigonometric polynomial used, default is 4 as paper suggested
--alpha: specify user parameter alpha
--lamb: specify lamb * number of pixels for E_r term, where E_image = E_s + E_r as paper suggested
The following commands contains parameters used for output with reasonable quality, where the output image paths are all set to testarg.png:
python .\ngm.py --input ".\images\map.png" --output "testarg.png" -a 0.1 -l 1
python .\ngm.py --input ".\images\sample.png" --output "testarg.png" -a 4 -l 1
python .\ngm.py --input ".\images\colorCircle.png" --output "testarg.png" -a 1 -l 1
python .\ngm.py --input ".\images\dots.png" --output "testarg.png" -a 1 -l 1
python .\ngm.py --input ".\images\MonetP.png" --output "testarg.png" -a 4 -l 1
python .\ngm.py --input ".\images\lischinski.png" --output "testarg.png" -a 0.1 -l 500
python .\spcr.py --input ".\images\sample_30.png" --output "testarg.png" --mu 8
python .\spcr.py --input ".\images\dots.png" --output "testarg.png" --mu 16
python .\spcr.py --input ".\images\mapIslandCrop.png" --output "testarg.png" --mu 16 --npi 8
python .\spcr.py --input ".\images\MonetP.png" --output "testarg.png" --mu 16
python .\spcr.py --input ".\images\lischinski.png" --output "testarg.png" --mu 32 --npi 2 --alpha 10