From a 4-hypercube colour space, spaces of the type hue-saturation-luminance are derived. The hue component may have the topology of a 2-sphere, a 2-torus or a 3-sphere, in several possibilities we consider.

syntactic principles. Cognition, 118, 306–338. http://dx.doi.org/ 10.1016/j.cognition.2010.11.001 Persaud, K., & Hemmer, P. (2014). The influence of knowledge and expectations for color on episodic memory. In P. Bello, M. Guarini, M. McShane, & B. Scassellati (Eds.), Proceedings of the Thirty-Sixth Annual Conference of the Cognitive Science Society (pp. 1162–1167). Austin, TX: Cognitive Science...

The greenhouse experiment was conducted to evaluate the effect of black polyethylene (PE) plastic mulch on yield and some quality parameters tomato. In study, PE material laid raised beds bare soil (not mulched) used as control. Mulch did not affect plant height, fruit shape index, chroma hue angle, firmness, soluble solids content, titratable acidity. Black had a positive influence yield. Sign...

Carrot (Daucus carota) is one of the most important vegetables in world. Cow urine a fertilizer available rural areas and can be used agriculture. However, there are no indications best dose to carrots. The authors aimed with this work evaluate different concentrations cow cultivation ‘Brasília’ treatments consisted five doses (0%, 0.5%, 1.0%, 1.5% 2.0%) applied d...

Observers viewed M- or L-cone-isolating stimuli and compared slowly-on and slowly-off sawtooth waveforms of the same mean chromaticity and luminance. Between 6 and 13 Hz, the mean hue of slowly-on L-cone and slowly-off M-cone sawtooth flicker appeared redder, and the mean hue of slowly-off L-cone and slowly-on M-cone sawtooth stimuli appeared greener-despite all the waveforms' having the same m...

A longstanding and unresolved question is how observers construct a discrete set of color categories to partition and label the continuous variations in light spectra, and how these categories might reflect the neural representation of color. We explored the properties of color naming and its relationship to color appearance by analyzing individual differences in color-naming and hue-scaling pa...

An unsupervised algorithm for speaker’s lip segmentation is presented in this paper. A color video sequence of speaker’s face is acquired, under natural lighting conditions and without any particular make-up. First, a logarithmic color transform is performed from RGB to HI (hue, intensity) color space and sequence dependant parameters are evaluated. Second, a statistical approach using Markov r...

An innovative technique for segmentation of color images is proposed. The technique implements an approach based on thresholding of the hue histogram. A new function for detecting valleys of the histogram has been devised and tested. A novel blurring algorithm for noise reduction that works effectively when used over hue image, has been employed. A feed-forward neural network that learns to rec...

We have analyzed the properties of the HSV (Hue, Saturation and Value) color space With emphasis on the visual perception of the variation in Hue, Saturation and Intensity values of an image pixel. We extract pixel features by either choosing the Hue or the Intensity as the dominant property based on the Saturation value of a pixel. The feature extraction method has been applied for both image ...

The hue discrimination curve (HDC) that characterizes performances over the entire hue circle was determined by using sinusoidally modulated spectral power distributions of 1.5 c/300 nm with fixed amplitude and twelve reference phases. To investigate relationship between hue discrimination and appearance, observers further performed a free color naming and unique hue tasks. The HDC consistently...