Hue matching was used to obtain measures of Bezold-Brucke hue shifts with very brief flashes (17 msec) at ten wavelengths and several illuminance levels. Results were generally similar to those obtained by Purdy (1931) with uncontrolled stimulus duration. but there were also important differences. These were: the locations of invariant hues; the direction of shift for blue-green hues: and a rev...

The HLS colour space is widely used in image analysis as it is physically intuitive. As the hue component of this space is defined on the unit circle, standard greyscale image analysis operators, specifically morphological operators, are not applicable to it. A variation of the standard morphological operators which require the choice of an origin are discussed. In addition, some lexicographica...

Most colour‐normal human observers have no difficulty to adjust a coloured light such that it appears neither red nor green, or such that it appears neither yellow nor blue. Moreover, it has been shown that these hue judgements are not significantly influenced by language or age and individual differences in colour sensitivity are not reflected in the unique‐hue settings. Here we ...

This paper proposes a new method of color image segmentation considering both global information and local homogeneity. The method applies the mean shift algorithm in the hue and intensity subspace of HSV. The cyclic property of the hue component is also considered in the proposed method. Experiments on natural color images show promising results.