This article discusses the relationship between lighting conditions of a natural scene and the reproduction of colors in a picture of that scene. Possibilities to use metadata concerning the origins of a picture to an advantage in color balance adjustments were studied at the Laboratory of Media Technology (Helsinki University of Technology). A prototype application for estimating the prevailin...

MPEG-7 is a new standard which addresses the multimedia content description problem at very different levels: description tools range from low-level features such as color and pitch to high-level features such as the name of the characters in a scene or the title of a movie. This paper presents an MPEG-7 enabled application based on a low-level descriptor: the visual color temperature. The impl...

Texture is one of the fundamental image characteristics useful in computer vision tasks such as object recognition and scene analysis. Texture segmentation is one of the image analysis tasks. The prospect of texture segmentation depends on the choice of the texture description method and the segmentation procedure. In this paper, color-texture descriptors are proposed to represent the texture c...

A channel transformation based on opponent-color theory of the color vision models is applied to optical pattern recognition so that the conventional red, green, and blue (RGB) channels are transformed into bright–dark, red–green, and yellow–blue (ATD) channels. Matched filtering and correlation are performed over the new components of the target and the scene in the ATD system. The proposed tr...

In this paper we propose an approach to color classification and image segmentation in non-stationary environments. Our goal is to cope with changing illumination condition by on-line adapting both the parametric color model and its structure/complexity. Other authors used parametric statistics to model color distribution in segmentation and tracking problems, but with a fixed complexity model....

Color alignment is one of the important processes in the 2D-3D texture mapping. In this paper, a novel method for color alignment is presented. An overview of the method is as follows. Given multiple images of a textured object taken from various positions and three-dimensional geometrical data of the object, we first estimate the surface normal direction of the object in an image using the thr...

When the perceptual system uses color to facilitate object recognition, it must solve the color-constancy problem: The light an object reflects to an observer's eyes confounds properties of the source of the illumination with the surface reflectance of the object. Information from the visual scene (bottom-up information) is insufficient to solve this problem. We show that observers use world kn...

A new color correction method is introduced which predicts how changing the color of the scene illuminant will affect a camera’s RGB response. Like diagonal transformation color correction methods. the new method requires only 3-parameters. It therefore requires only the RGB color of the two illuminants be known. The method models the 9-parameters of a 3-by-3 linear transformation using a 3dime...