Colour vision brings clarity to shadows

Colour vision brings clarity to shadows.

We have revealed a new role for colour vision in visual scene analysis: colour vision facilitates shadow identification. Shadows are important features of the visual scene, providing information about the shape, depth, and movement of objects. To be useful for perception, however, shadows must be distinguished from other types of luminance variation, principally the variation in object reflecta...

Colour Vision: Adapting to change

The colours we see reflect not only the light wavelengths presently being detected, but also those already received. To understand colour constancy therefore requires an understanding of adaptation in the visual system.

Colour-Vision and Colour-Blindness

Colour image segmentation in presence of shadows

To achieve a correct colour image segmentation in the presence of shadows is still a challenge. The varying object shapes in a scene provoke several effects in an image such as shadows, shadings, and highlights. This physical effects produce strong edges on an image that are not considered for human segmentation. These edges are detected by the current segmentation methods. This paper analyze t...

Colour vision

The immense range of colours that we see belies the relative simplicity of the system underlying colour vision. We see colours because each of the three distinct types of cone photoreceptor in our retinae is sensitive to a different range of wavelengths of light. The L, M and S cones, colloquially called red (R), green (G), and blue (B), are selective for long, middle and short wavelengths, res...