Digital Pictures: Representation, Compression and Standards by Arun N. Netravali

By Arun N. Netravali

The moment Edition info the proven foreign criteria for electronic imagery. Chapters talk about criteria for the digitalization of bilevel photos, colour images, video conferencing, and tv.

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Extra resources for Digital Pictures: Representation, Compression and Standards (Applications of Communications Theory)

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Otherwise, the samples in successive lines are spatially staggered with respect to each other. 6) This signal is then passed to a raster scanned display device that has a scanning spot characteristic hd (u, v), perhaps similar to that of the camera. 7) Numerical Representation of Visual Information 17 Fig. 2 Post-aliasing of a raster scanned display. The raster scan-lines of the display are visible due to insufficient post-filtering in the vertical direction. With raster scanned display devices, filtering in the vertical direction must be done either by the viewer's eye or by proper control of the scanning beam and, if present, optical components.

This distortion is postaliasing, and is caused by inadequate post-filtering of Bs (x,y). 3. 41 In particular, the offset sampling pattern of Fig. 1b may be converted to a rectangular pattern by a rotation of axes. The spectrum of the sampled image Bs (x,y) may then be obtained by a similar rotation of Fig. 3. 5 Frequency Spectra of Raster Scanned Images The raster scanned video signal ii(t> defined by Eqs. 3) can also be described in the frequency domain. In this case, Ny is the number of scan lines, each of duration TL seconds, and Chapter 1 30 3M ,,0 \ • SUBOPTIMAL -3N -3M Fig.

Such colors are called metamers. The spectral distributions of two metamers are shown in Fig. 5. Colors that have identical spectral distributions are called isomers. The condition of isomerism is obviously much stricter and not required in most applications. One case that often arises is when we have a source of light, with spectral distribution S (~), that is viewed after reflecting from surfaces having reflectance factors {31 (~) and {32 (~), respectively. 6) f S (~){31 (~)b (~)d~ = f S (~){32(~)b (~)d~ However, this match may be affected if the conditions of observation are changed for example by changing the illuminant from S (~) to S (~).

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