Introduction - If you have any usage issues, please Google them yourself
Rgb = hsi2rgb (hsi) put an HSI image is converted to RGB images,
Wherein hsi (:,:, 1) is the chrominance component, it is divided by 2* pi range after [0, 1]
Hsi (:,:, 2) is the saturation component, the range is [0, 1]
Hsi (:,:, 3) is the luminance component, the range is [0, 1].