By Bernd Jahne
According to the hugely winning 3-volume reference guide of computing device imaginative and prescient and functions , this concise variation covers in one quantity the full spectrum of desktop imaginative and prescient ranging shape the imaging strategy to high-end algorithms and functions. This booklet includes 3 components, together with an program gallery, and is followed by means of an interactive CD-ROM. * Bridges the distance among conception and sensible functions * Covers smooth ideas in computing device imaginative and prescient in addition to glossy advancements in imaging sensor know-how * offers a special interdisciplinary strategy overlaying assorted components of contemporary technology * An accompanying CD-ROM presents complete textual content with links for speedy looking out and skimming in addition to reference fabric, interactive software program parts, code examples, snapshot fabric, full-color figures, and references to net resources
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Extra resources for Computer Vision and Applications: Concise Edition
The radiant intensity in a given direction is the sum of the radiant ﬂux contained in all rays emitted in that direction under a given solid angle by the entire source (see Eq. 18)). The term intensity is frequently confused with irradiance or illuminance. 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.
49) with the extinction coeﬃcient or attenuation coeﬃcient κ of the material (in environmental sciences, κ is sometimes referred to as turbidity). The unit of κ is a reciprocal length, such as m−1 . Solving Eq. 50) 0 If the medium shows homogeneous attenuation, that is, κ(λ, z) = κ(λ), Eq. 51) which is known as Lambert Beer’s or Bouguer’s law of attenuation. It has to be pointed out that Bouguer’s law holds only for ﬁrst-order (linear) processes, Eq. 49), where dL is proportional to L. This is true for a wide range of practical applications, but breaks down for very high intensities, such as laser radiation, or if multiscatter processes play a dominant role.
Using diﬀerent types of radiation allows images from diﬀerent depths or object properties to be attained. Standard scenes usually contain more than one single object in a uniform enclosure. Radiation has to pass a series of events, called the radiometric chain, before it reaches the imaging system. 10 illustrates how incident radiation is inﬂuenced by all objects and matter along the optical path. In this section, the basic mechanisms inﬂuencing the emission of radiation and its propagation in matter will be detailed.