Color Homography Color Correction

Color Homography Color Correction

Homographies – a mathematical formalism for relating image points across different camera viewpoints – are at the foundations of geometric methods in computer vision and are used in geometric camera calibration, image registration, and stereo vision and other tasks. In this paper, we show the surprising result that colors across a change in viewing condition (changing light color, shading and c...

Color Homography

Homography H Least-squares M b) a) c) Ball_1 Ball_2 Ball_3 Ball_4 b) H r g r g π 1 π 2 Fig. 1. Top left, panel (a), images of two planes are related by an homography. Right, panel (b), 4 images of a colored ball are shown. Ball 1 is the reference image where the illumination color is white and placed behind the camera. Ball 2 is the object illuminated with a blue light from above. Respectively,...

Recoding Color Transfer as A Color Homography

The recently discovered color homography theorem proves that colors across a change in photometric viewing condition are related by a homography [2]. In this paper, we propose a color-homography-based color transfer decomposition which encodes color transfer as a combination of chromaticity shift and shading adjustment. Our experiments show that the proposed color transfer decomposition provide...

Explorer Color Homography

Color Homography: theory and applications

Images of co-planar points in 3-dimensional space taken from different camera positions are a homography apart. Homographies are at the heart of geometric methods in computer vision and are used in geometric camera calibration, 3D reconstruction, stereo vision and image mosaicking among other tasks. In this paper we show the surprising result that homographies are the apposite tool for relating...