SYSTEM AND METHOD FOR CHANGING HAIR COLOR IN DIGITAL IMAGES

摘要

A system and method for digital hair coloring is described. A starting image of a subject including a hair region is obtained. At least one foreground selection of the starting image is obtained, the foreground selection including a portion of the hair region. At least one background selection of the starting image excluding the hair region is obtained. A matte defining a calculated foreground area of the starting image is calculated based on the foreground selection and the background selection. A target color distribution based on a target hair color is obtained. A color image is generated by applying a color transformation based on the target color distribution to at least the calculated foreground area of the starting image. An output image is generated from the colored image and the starting image.

主权项

1. A computer-implemented method for digital hair coloring comprising:
obtaining a starting image I of a subject including a hair region; calculating a matte defining a calculated foreground area of said starting image, wherein said calculated foreground area comprises said hair region, wherein said matte comprises an alpha mask α composed of alpha values corresponding to each pixel of the starting image; obtaining a target color distribution of a target hair color in an ellipsoidal volume of a three-dimensional color space; generating a recolored image T(l) by using nonlinear color transformation to map a starting color distribution of the calculated foreground area of the starting image to the target color distribution; and generating an output image O from alpha blending of said recolored image with said starting image resulting in changing of color of said hair region, wherein said output image is generated from an equation comprising
O=αT(l)+(1−α)I.