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Eye spectral response. There are two basic types of retinal photo-receptors: cones, responding to bright-light conditions, and rods, responding to low-intensity light. Depending on their spectral sensitivity, the former belong to either L (long-wavelengths sensitive), M (mid-wavelengths sensitive) or S (short-wavelengths sensitive) cones.
Eye spectral response . 13.8. Eye intensity response, contrast sensitivity. Eye light-intensity response. Human eye is capable of responding to an enormous range of light intensity, exceeding 10 units on logarithmic scale (i.e. minimum-to-maximum intensity variation of over 10-billion-fold). Inevitably, eye response to the signal intensity ...
The eye’s response to light depends on physical, physiological and psychological factors and varies from person to person, making it difficult to define the average observer. In 1924, the Commission Internationale de l’Eclairage (CIE), or International Commission on Illumination, conducted a series of experiments to quantify the human eye’s response to visible light.
The luminous flux, which is also a photometric quantity, represents the light power of a source as perceived by the human eye. The unit of luminous flux is the lumen (lm). It is defined as follows: a monochromatic light source emitting an optical power of (1/683) watt at 555 nm has a luminous flux of 1 lumen (lm).
Spectral sensitivity of the human eye. The sensitivity of the human eye to light of a certain intensity varies strongly over the wavelength range between 380 and 800 nm. Under daylight conditions, the average normal sighted human eye is most sensitive at a wavelength of 555 nm, resulting in the fact that green light at this wavelength produces ...
The choice of spectral luminous efficiency function for the eye affects only the computation of contrast for objects that differ in SPD to the surrounding background (see Fig. 2.3). In such cases, differences in cone photoreceptor signals at high light levels can also contribute significantly to perceived object contrast (in the form of colour signals) and hence any efforts to produce a single ...
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Figure 1: The photopic response function according to CIE. Data source: Colour & Vision Research Laboratory of the University College London, page on luminous efficiency functions. Under faint illumination conditions, the human eye uses the substantially more sensitive rod cells (scotopic vision). There is only one kind of those rods, and as a ...
