Method and apparatus for evaluating illumination condition in face image
AssigneeFujitsu Limited
InventorsPingping Lu, Rujie Liu
Life of this patent
Estimating the term…
Abstract
A method and apparatus for evaluating an illumination condition in a face image is provided by decomposing a face image into illumination feature components and face feature components; extracting determined areas in the face image; calculating a maximum luminance feature, a minimum luminance feature and an illumination direction feature according to the decomposed illumination feature components in the determined areas. The illumination condition in the face image is evaluated according to the maximum luminance feature, the minimum luminance feature and the illumination direction feature.
Claims19
A method by a computing apparatus to evaluate an illumination condition in a face image, comprising:
- decomposing a face image among a plurality of face images into illumination feature components and face feature components, the decomposing including,
- decomposing the face image into original illumination feature components and original face feature components, and
- obtaining the illumination feature components and the face feature components based on a mean value of the original face feature components;
- extracting determined areas in the face image;
- calculating a maximum luminance feature, a minimum luminance feature and an illumination direction feature, according to the decomposed illumination feature components in the determined areas;
- and
- evaluating an illumination condition in the face image according to the maximum luminance feature, the minimum luminance feature and the illumination direction feature.
An apparatus to evaluate an illumination condition in a face image, comprising:
- a memory, and
- a processor coupled to the memory and the processor to execute,
- decompose a face image among a plurality of face images into illumination feature components and face feature components, the decomposing including,
- decomposing the face image into original illumination feature components and original face feature components, and
- obtaining the illumination feature components and the face feature components based on a mean value of the original face feature components;
- extract determined areas in the face image;
- calculate a maximum luminance feature, a minimum luminance feature and an illumination direction feature according to the decomposed illumination feature components in the determined areas;
- and
- evaluate an illumination condition in the face image according to the maximum luminance feature, the minimum luminance feature and the illumination direction feature.
Dependencies are inferred from the claim text.