The following study discusses the relationship of high redshift(z) Quasi Stellar Objects’(QSOs) flux, luminosity, and color indices. paper analyzes observable trends among these 3 variables uses them to understand distribution QSOs across space-time. While many such studies have been conducted in redshift ranges 1<z<4, research or has done relatively unexplored date range 2 <z<7. To...

The paper elaborates on understanding, measuring and optimizing perceived color quality of natural images. We introduce a model for optimal color reproduction of natural scenes which is based on the assumption that color quality of natural images is constrained by perceived naturalness and colorfulness of these images. To verify the model, a few experiments were carried out where subjects estim...

Previous researches have shown that the digital image color intensity could reflect the crops N status, but there is little information about the comparision of spectrum reflectance in the visible bands with the digital imagery color intensities. A field experiment was conducted to compare the wheat canopy reflectance at visible bands (400-700 nm) at shooting stage with near ground digital imag...

In this paper we present a method for retrieval of color images via query-by-example which takes into consideration human perception regarding the number of colors present in images being compared.. First, we perform HSV-space segmentation to extract regions of perceptually relevant color, to build a low-level color representation. This segmented result is then used to build image indices by ta...

pollination and pest control are perhaps the best-known ecological services performed by hover flies. the species diversity and their abundance have an influential impact on the ecological services provided by this family. to find out species diversity of adult flower flies associated with agroecosystems in kerman province, a biodiversity survey using insect net and color water traps was conduc...

Asbestos fibers as small as 1 mum in diameter can be uniquely identified by light microscopy by employing dispersion staining methods. The technique described herein involves suspension of fibers in liquids of known refractive indices and observation of color display by means of a dispersion staining objective. Wavelengths or indices of refraction may be determined at right angles to and parall...

In connection with the preceding investigation relating to the photovisual magnitudes of the stars, photovisual and photographic magnitudes of the brighter planets have been determined by out-of-focus methods. These observations were made with the view of obtaining better values of color index. The detailed discussion will appear soon in Harvard Annals, 85, No. 4. The number of plates taken for...