Advanced Color Image Processing and Analysis by Christine Fernandez-Maloigne PDF

By Christine Fernandez-Maloigne

ISBN-10: 1441961895

ISBN-13: 9781441961891

This quantity does even more than survey sleek complicated colour processing. beginning with a old standpoint on methods we've got categorised colour, it units out the most recent numerical innovations for interpreting and processing colours, the forefront in our seek to safely list and print what we see. The human eye perceives just a fraction of accessible gentle wavelengths, but we are living in a multicolor global of myriad shining colours. 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 growth: only in the near past have we possessed the computing ability to technique the algebraic matrices that reproduce colour extra effectively. With chapters on dihedral colour and photograph spectrometers, this e-book offers technicians and researchers with the data they should clutch the intricacies of today’s colour imaging.

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Sample text

This effect highlights the importance of considering the absolute luminance level in colour appearance models, which is not considered in traditional colorimetry. 2 Stevens Effect Stevens and Stevens [35] asked observers to make magnitude estimations of the brightness of stimuli across various adaptation conditions. The results showed that the perceived brightness contrast increased with an increase in the adapting luminance level according to a power relationship. 1 Surround Effect Bartleson and Breneman [36] found that the perceived contrast in colourfulness and brightness increased with increasing illuminance level from dark surround, dim surround to average surround.

Sin(h) If | cos(h)| > | sin(h)|, then p5 = a= p1 , cos(h) p2 · (2 + p3) · p5 + (2 + p3) · b = a· 220 1403 − 27 1403 460 1403 − p3 · 6300 1403 · sin(h) cos(h) , sin(h) . cos(h) Step 4: Calculate Ra , Ga and Ba Ra = 288 460 451 · p2 + ·a+ · b, 1403 1403 1403 Ga = 261 460 891 · p2 − ·a− · b, 1403 1403 1403 Ba = 6300 460 220 · p2 − ·a− · b. 42 . ⎧ ⎨ 1 if x > 0 Here, sign(x) = 0 if x = 0 , and similarly computing G , and B from ⎩ −1 if x < 0 Ga , and Ba . Step 6: Calculate RC , GC and BC (for the inverse matrix, see the note at the end of the Appendix) ⎛ ⎞ ⎛ ⎞ Rc R −1 ⎝ Gc ⎠ = MCAT02 · M ⎝ G ⎠.

Luo and C. 305 · Nbb . 20 Note that all parameters computed in this step are needed for the following calculations. However, they depend only on surround and viewing conditions; hence, when processing pixels of image, they are computed once for all. The following computing steps are sample dependent. 1. 13 100 and similarly for the computations of Ga , and Ba , respectively. Step 5: Calculate Redness–Greenness (a) , Yellowness–Blueness (b) components and hue angle (h): 12 · Ga Ba + , 11 11 (R + Ga − 2 · Ba) , b= a 9 b h = tan−1 a a = Ra − make sure h between 0 and 360◦.

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Advanced Color Image Processing and Analysis by Christine Fernandez-Maloigne


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