Computer Vision and Applications: Concise Edition by Bernd Jahne

By Bernd Jahne

In keeping with the hugely winning 3-volume reference guide of laptop imaginative and prescient and functions , this concise version covers in one quantity the full spectrum of machine imaginative and prescient ranging shape the imaging approach to high-end algorithms and functions. This e-book includes 3 components, together with an software gallery, and is followed through an interactive CD-ROM. * Bridges the distance among idea and useful functions * Covers smooth thoughts in computing device imaginative and prescient in addition to sleek advancements in imaging sensor know-how * offers a special interdisciplinary strategy overlaying diversified parts of contemporary technology * An accompanying CD-ROM offers complete textual content with links for fast looking out and skimming besides reference fabric, interactive software program elements, code examples, photograph fabric, full-color figures, and references to net resources

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While radiometry deals with electromagnetic radiation of all wavelengths, photometry deals only with the visible portion of the electromagnetic spectrum. 1 Spectral response of the human eye Light is perceived by stimulating the retina after passing the preretinal optics of the eye. The retina consists of two different types of receptors: rods and cones. At high levels of irradiance the cones are used to detect light and to produce the sensation of colors (photopic vision). Rods are used mainly for night vision at low illumination levels (scotopic vision).

Rods are used mainly for night vision at low illumination levels (scotopic vision). Both types of receptors have different sensitivities to light at different wavelengths. The response of the “standard” light-adapted eye is defined by the normalized photopic spectral luminous efficiency function V (λ) (Fig. 9). It accounts for eye response variation as related to wavelength and 28 2 Radiation and Illumination shows the effectiveness of each wavelength in evoking a brightness sensation. Correspondingly, the scotopic luminous efficiency function V (λ) defines the spectral response of a dark-adapted human eye (Fig.

Although the ideal cases usually do not exist for the entire spectrum, they can be realized for selective wavelengths. Surface coatings, such as, for example, antireflection (AR) coatings, can be technically produced with high precision for a narrow spectral region. 12 shows how radiometric measurements are influenced by the optical properties of objects. In order to measure the emitted flux Φ1 (e. , to estimate the temperature of the object), the remaining seven ˜1 , τ ˜1 , Φ2 , and Φ3 have to be known.

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