By Bernd Jahne
In line with the hugely winning 3-volume reference guide of computing device imaginative and prescient and purposes , this concise version covers in one quantity the full spectrum of machine imaginative and prescient ranging shape the imaging procedure to high-end algorithms and purposes. This publication comprises 3 components, together with an software gallery, and is observed by means of an interactive CD-ROM. * Bridges the distance among idea and sensible functions * Covers glossy recommendations in computing device imaginative and prescient in addition to glossy advancements in imaging sensor know-how * provides a special interdisciplinary process overlaying assorted components of contemporary technological know-how * An accompanying CD-ROM offers complete textual content with links for fast looking out and perusing in addition to reference fabric, interactive software program elements, code examples, snapshot fabric, full-color figures, and references to web resources
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Extra info for Computer Vision and Applications: Concise Edition
Same spectral radiance as a blackbody but reduced by the factor ˜. This relation is known as Kirchhoﬀ’s law . It also holds for the integrated quantities ˜(λ) and ˜. Kirchoﬀ’s law does not hold for active optical eﬀects shifting energy between wavelengths, such as ﬂuorescence, or if thermodynamic equilibrium is not reached. Kirchhoﬀ’s law also does not apply generally for two diﬀerent components of polarization [6, 12]. 3 summarizes basic idealized object and surface types in terms of the optical properties deﬁned in this section.
It is, however, a precisely deﬁned quantity in radiometric terminology and should only be used in this context to avoid confusion. Radiance. 12) where dS⊥ = dS cos θ deﬁnes a surface element that is perpendicular to the direction of the radiated beam (Fig. 6b). The unit of radiance is W m−2 sr−1 . Radiance combines the concepts of exitance and intensity, relating intensity in a certain direction to the area of the emitting surface. And conversely, it can be thought of as exitance of the projected area per unit solid angle.
53) Therefore, a layer of thickness κ −1 (λ) has a transmittance of e−1 . This distance is called penetration depth of the radiation at the speciﬁc wavelength. A variety of materials do not exhibit scattering. In these cases κ = α. Another frequently used term (mainly in spectroscopy) is the optical depth τ(z1 , z2 ) of a medium. 54) z1 Taking the logarithm of the radiance, Lambert Beer’s law (see Eq. 55) m =0 Again, for nonscattering media κ has to be replaced by α. Absorption. The absorption coeﬃcient α of a material can be computed from the imaginary part k of the complex index of refraction (Eq.