Lightness, brightness, and brightness contrast: 1. Illuminance
Stevens's brightness law, contrast gain control, and edge integration in achromatic color...
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Stevens’s brightness law, contrast gain control, and edge integration in achromatic color perception: a unified model: errata Michael E. Rudd 1, * and Dorin Popa 2 1 Howard Hughes Medical Institute and Department of Physiology and Biophysics, University of Washington, Seattle, Washington, USA 2 Department of Psychology, University of Washington, Seattle, Washington, USA * Corresponding author: [email protected] Received August 28, 2007; posted August 28, 2007 (Doc. ID 86614); published September 24, 2007 Several math errors that appeared in a paper by Rudd and Popa [J. Opt. Soc. Am. A 24, 2766 (2007)] are cor- rected. OCIS codes: 330.1720, 330.4060, 330.4270, 330.5020, 330.5510, 330.7310. Several errors were published in [1]. Equation (8) should read n→mk = n→mk 1- d k s n→mk + . 1 Equation (9) should read d k = w 1k * + w 1k * 2 2→1k 1- d k s 2→1k + + w 2k * 1 1→2k 1- d k s 1→2k + log F k - log B . 2 Equation (A3) should read c 0 -1 c 1 + c 2 + c 3 d T + + c 4 + c 5 d T + + c 6 + c 7 + c 8 d T + + c 9 + c 10 d T + log S T . 3 Equation (A5) should read log = log + log S k . 4 Note that Eq. (4) follows directly from Eq. (1) of [1], with the understanding that I = S k . According to the edge inte- gration model, both and are functions of d k , as is made explicit by Eqs. (A6b) and (A6c) of [1]. REFERENCES 1. M. E. Rudd and D. Popa, “Stevens’s brightness law, contrast gain control, and edge integration in achromatic color perception: a unified model,” J. Opt. Soc. Am. A 24, 2766–2782 (2007). M. E. Rudd and D. Popa Vol. 24, No. 10/October 2007/J. Opt. Soc. Am. A 3335 1084-7529/07/103335-1/$15.00 © 2007 Optical Society of America
Transcript of Stevens's brightness law, contrast gain control, and edge integration in achromatic color...
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M. E. Rudd and D. Popa Vol. 24, No. 10 /October 2007 /J. Opt. Soc. Am. A 3335
Stevens’s brightness law, contrast gain control,and edge integration in achromatic color
perception: a unified model: errata
Michael E. Rudd1,* and Dorin Popa2
1Howard Hughes Medical Institute and Department of Physiology and Biophysics, University of Washington,Seattle, Washington, USA
2Department of Psychology, University of Washington, Seattle, Washington, USA*Corresponding author: [email protected]
Received August 28, 2007;posted August 28, 2007 (Doc. ID 86614); published September 24, 2007
Several math errors that appeared in a paper by Rudd and Popa [J. Opt. Soc. Am. A 24, 2766 (2007)] are cor-rected.
OCIS codes: 330.1720, 330.4060, 330.4270, 330.5020, 330.5510, 330.7310.
Ntge
R
everal errors were published in [1].Equation (8) should read
��n→m�k = ��n→m�k�1 −dk
s�n→m�k�+
. �1�
Equation (9) should read
��dk� = w1k* + �w1k
* �2��2→1�k�1 −dk
s�2→1�k�+
+ w2k* �1��1→2�k�1 −
dk
s�1→2�k�+��log Fk − log B�.
�2�
Equation (A3) should read
1084-7529/07/103335-1/$15.00 © 2
c0−1�c1 + �c2 + c3dT�+ + �c4 + c5dT�+ + �c6 + �c7 + c8dT�+
+ �c9 + c10dT�+�log ST�. �3�
Equation (A5) should read
log � = log � + � log Sk. �4�
ote that Eq. (4) follows directly from Eq. (1) of [1], withhe understanding that I=Sk. According to the edge inte-ration model, both � and � are functions of dk, as is madexplicit by Eqs. (A6b) and (A6c) of [1].
EFERENCES1. M. E. Rudd and D. Popa, “Stevens’s brightness law,
contrast gain control, and edge integration in achromaticcolor perception: a unified model,” J. Opt. Soc. Am. A 24,
2766–2782 (2007).007 Optical Society of America
