Download e-book for kindle: Advanced color image processing and analysis by Christine Fernandez-Maloigne

By Christine Fernandez-Maloigne

ISBN-10: 1441961895

ISBN-13: 9781441961891

ISBN-10: 1441961909

ISBN-13: 9781441961907

This quantity does even more than survey glossy complex colour processing. beginning with a old viewpoint on methods we now have categorised colour, it units out the most recent numerical thoughts for studying and processing colours, the forefront in our seek to adequately list and print what we see. The human eye perceives just a fraction of obtainable mild wavelengths, but we are living in a multicolor international of myriad shining colorings. shades wealthy in metaphorical institutions make us “purple with rage” or “green with envy” and reason us to “see red.” Defining shades has been the paintings of centuries, culminating in today’s complicated mathematical coding that still continues to be a piece in development: just recently have we possessed the computing means to strategy the algebraic matrices that reproduce colour extra safely. With chapters on dihedral colour and photo spectrometers, this ebook presents technicians and researchers with the information they should seize the intricacies of today’s colour imaging.

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During dark viewing conditions, the pupil size is the largest. Each of the three cones responds to light in a nonlinear manner and is controlled by the gain and inhibitory mechanisms. Light and dark adaptations only consider the change of light level, not the difference of colour between two light sources (up to the question of Purkinje shift due to the difference in the spectral sensitivity of the rods and cones). Under photopic adaptation conditions, the difference between the colours of two light sources produces chromatic adaptation.

Luo MR, Hunt RWG (1998) A chromatic adaptation transform and a colour inconstancy index. Color Res Appl 23:154–158 31. Li CJ, Luo MR, Hunt RWG (2000) A revision of the CIECAM97s Model. Color Res Appl 25:260–266 32. Hunt RWG, Li CJ, Juan LY, Luo MR (2002), Further improvements to CIECAM97s. Color Res Appl 27:164–170 33. Finlayson GD, S¨usstrunk S (2000) Performance of a chromatic adaptation transform based on spectral sharpening. Proceedings of IS&T/SID 8th color imaging conference, 49–55 34. Hunt RWG (1952) Light and dark adaptation and perception of color.

Hence, they are computed once for all. The following computing steps are sample dependent. , J or Q; C, M, or s; and H or h. Hence, the followings are needed to convert the others to J, C, and h. 25 2 . 4 in the Forward mode. Choose a proper i (i = 1,2,3 or 4) so that Hi ≤ H < Hi+1 . h = (H − Hi ) · (ei+1 hi − ei · hi+1 ) − 100 · hi · ei+1 . (H − Hi ) · (ei+1 − ei ) − 100 · ei+1 Set h = h − 360 if h > 360, otherwise h = h . R. Luo and C. Li p4 = b= p1 , sin(h) p2 · (2 + p3) · p4 + (2 + p3) · a = b· 220 1403 · cos(h) sin(h) 460 1403 − 27 1403 + p3 · 6300 1403 , cos(h) .

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Advanced color image processing and analysis by Christine Fernandez-Maloigne

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