Lighting theory luminance

Figure 7.4 Computation of the sequential product along a path on the Mondrian. The rectangles of the Mondrian are symbolized at the top. The reflectance is shown in percent inside each rectangle. Pairs of detectors are spread along the path. These pairs of detectors are used to compute the ratio of the measured luminance. A ratio of 1.0 is assumed for the beginning of the path. Whenever this ratio becomes larger than 1.0, it is reset to 1.0. After the rectangle with a reflectance of 1.0 is passed, the sequential product outputs the reflectance of the rectangle (Reproduced from Land EH and McCann JJ 1971 Lightness and retinex theory. Journal of the Optical Society of America, 61(1), 1-11 by permission from The Optical Society of America.)...

The high sensitivity of optical density to changes in foam expansion ratio and dispersity can be used as a background for developing optical techniques for the determination of these foam parameters. The theory of extinction of the luminous flux by the foam in which multiple light scattering is accounted for has been developed in [76]. 

The first scientist to suggest the trichromatic theory of color vision, Thomas Young, laid the foundation for the wave theory of light, stating that when a body becomes luminous it sends out waves of particular amplitude and wavelength. He noted that the length of these waves determines their color in much the same... 

The theory of laser schlieren system schlieren system is that reflecting the first order partial derivative with the change of refractive index in flow field and it can capture the shock wave and contact discontinuity. To combustion flow field with self-luminous light, the light given in flow field and illuminant will both cause film exposion. 

Thus, while optimal conditions of luminous efficiency or purity of color cannot be achieved on the basis of calculations, the theories of radiation might be a guiding factor—albeit as yet uncertain—in arriving at superior light sources. 

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