Stockman and Sharpe 2-deg S-cone fundamental based on the Judd, Vos CIE 2-deg CMFs
Stockman and Sharpe 2-deg S-cone fundamental based on the Judd, Vos CIE 2-deg CMFs
Data keyColumns
Energy
Quantal
NotesA version of the Stockman and Sharpe (2000) 2-deg S-cone fundamental, but based on the Judd, Vos CIE 2-deg CMFs. It is proposed as a replacement for other Judd, Vos based S-cone fundamentals, such as the S-cone fundamental of Smith and Pokorny (1975).
The 2° S-cone spectral sensitivity [S(l) or 
] is defined as linear combinations of the Judd, Vos CIE 2-deg CMFs 
, 
and 
.
Its derivation requires a knowledge of the single unknown, 
, in the following equation:
Stockman, Sharpe & Fach (1999)
estimated the unknown from cone spectral sensitivity and color matching data to be 
=0.0087. The value of 
, the true absolute value of
which is unknown, was chosen so that the function peaks at one.
For further details, see Stockman, Sharpe & Fach (1999). Stockman, Sharpe & Fach (1999) were unable to measure S-cone spectral sensitivity data after 615 nm, after which S(l) is so small that it can reasonably, for most purposes, be set to zero.
ReferencesJudd, D. B. (1951). Report of U.S. Secretariat Committee on Colorimetry and Artificial Daylight. In Proceedings of the Twelfth Session of the CIE, Stockholm (vol. 1, pp. 11). Paris: Bureau Central de la CIE.
Vos, J. J. (1978). Colorimetric and photometric properties of a 2-deg fundamental observer. Color Research and Application, 3, 125-128.
Smith, V. C. & Pokorny, J. (1975). Spectral sensitivity of the foveal cone photopigments between 400 and 500 nm. Vision Research, 15, 161-171.
Stockman, A., Sharpe, L. T., & Fach, C. C. (1999). The spectral sensitivity of the human short-wavelength cones. Vision Research, 39, 2901-2927.
Stockman, A., & Sharpe, L. T. (2000). Spectral sensitivities of the middle- and long-wavelength sensitive cones derived from measurements in observers of known genotype. Vision Research, 40, 1711-1737.
