Computer Vision and Applications: Concise Edition by Bernd Jahne

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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Same spectral radiance as a blackbody but reduced by the factor ˜. This relation is known as Kirchhoff’s law [11]. 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.

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