Analysis of white point and phosphor set differences of CRT displays

1990 ◽  
Vol 15 (3) ◽  
pp. 151-155 ◽  
Author(s):  
Peter G. Engeldrum ◽  
John L. Ingraham
Keyword(s):  
White Point

Auto White Balance Algorithm in Digital Camera

2012 ◽  
Vol 182-183 ◽  
pp. 2080-2084
Author(s):  
Jie Li ◽  
Xue Xiang Wang ◽  
Hao Liu
Keyword(s):  
Hardware Implementation ◽  
Digital Camera ◽  
Low Complexity ◽  
Light Sources ◽  
Light Conditions ◽  
Threshold Method ◽  
White Balance ◽  
White Point ◽  
A New Technique ◽  
Better Than

Auto white balance (AWB) is an important function of digital camera. The purpose of white balance is to adjust the image to make it look like taken under standard light conditions. We present a new technique to detect the reference white point of image in this paper. This technique detects the white point of image by using dynamic threshold method, thus making it more flexible and more applicable compared to other algorithms. We test 50 images which were taken under different light sources, and find that this algorithm is better than or comparable to other algorithms both in subjective and objective aspects. At the same time, this algorithm has low complexity, and it can be easily applied to hardware implementation.

scholarly journals Colorimetry of Luminescent Lanthanide Complexes

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 4022
Author(s):  
Julien Andres ◽  
Anne-Sophie Chauvin
Keyword(s):  
Visible Spectrum ◽  
Lanthanide Ions ◽  
Correction Function ◽  
Colorimetric Analysis ◽  
Fluorescent Compound ◽  
Hypersensitive Transition ◽  
Luminescent Probes ◽  
Trivalent Lanthanide ◽  
White Point ◽  
Colour Coordinates

Europium, terbium, dysprosium, and samarium are the main trivalent lanthanide ions emitting in the visible spectrum. In this work, the potential of these ions for colorimetric applications and colour reproduction was studied. The conversion of spectral data to colour coordinates was undertaken for three sets of Ln complexes composed of different ligands. We showed that Eu is the most sensitive of the visible Ln ions, regarding ligand-induced colour shifts, due to its hypersensitive transition. Further investigation on the spectral bandwidth of the emission detector, on the wavelengths’ accuracy, on the instrumental correction function, and on the use of incorrect intensity units confirm that the instrumental correction function is the most important spectrophotometric parameter to take into account in order to produce accurate colour values. Finally, we established and discussed the entire colour range (gamut) that can be generated by combining a red-emitting Eu complex with a green-emitting Tb complex and a blue fluorescent compound. The importance of choosing a proper white point is demonstrated. The potential of using different sets of complexes with different spectral fingerprints in order to obtain metameric colours suitable for anti-counterfeiting is also highlighted. This work answers many questions that could arise during a colorimetric analysis of luminescent probes.

scholarly journals Distinctive characteristics of subclasses of red–green P-cells in LGN of macaque

1998 ◽  
Vol 15 (1) ◽  
pp. 37-46 ◽  
Author(s):  
MARTIN J.M. LANKHEET ◽  
PETER LENNIE ◽  
JOHN KRAUSKOPF
Keyword(s):  
Phase Difference ◽  
Color Space ◽  
Macaca Nemestrina ◽  
Large Field ◽  
Temporal Characteristics ◽  
Temporal Properties ◽  
Parvocellular Neurons ◽  
White Point ◽  
Chromatic Properties ◽  
P Cells

We characterized the chromatic and temporal properties of a sample of 177 red–green parvocellular neurons in the LGN of Macaca nemestrina, using large-field stimuli modulated along different directions through a white point in color space. We examined differences among the properties of the four subclasses of red–green P-cells (on- and off-center, red and green center). The responses of off-center cells lag the stimulus more than do those of on-center cells. At low temporal frequencies, this causes the phase difference between responses of the two kinds of cells to be considerably less than 180 deg. For isoluminant modulations the phases of on- and off-responses were more nearly 180 deg apart. A cell's temporal characteristics did not depend on the class of cone driving its center. Red center and green center cells have characteristically different chromatic properties, expressed either as preferred elevations in color space, or as weights with which cells combine inputs from L- and M-cones. Red center cells are relatively more responsive to achromatic modulation, and attach relatively more weight to input from the cones driving the center. Off-center cells also attach relatively more weight than do on-center cells to input from the class of cone driving the center.

scholarly journals Dispersion phenomena demonstrated by a nanocarbon white point source

2006 ◽  
Vol 14 (2) ◽  
pp. 932 ◽  
Author(s):  
Shaomin Wang ◽  
Laigui Hu ◽  
Binzhi Zhang ◽  
Jie Wang ◽  
Daomu Zhao
Keyword(s):  
Point Source ◽  
White Point
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