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Imatest Documentation Stepchart The incident light level in lux is entered in a box near the lower-left of the Stepchart input dialog box. If it is blank or zero, sensitivity will not be calculated. Colorcheck The incident light level in lux is entered in a box near the lower-center of the Colorcheck input dialog box. If it is blank or zero, sensitivity will not be calculated. SFRplus Results ( Ssat , SSOS , and the incident lux level) are displayed in the upper-right of the Stepchart noise detail figure (the second figure when all are checked). Results ( Ssat , SSOS , and the incident lux level) are displayed in the Density response plot in the upper-left of the Colorcheck noise detail figure (the second figure when all are checked). The incident light level in lux is entered in the Settings area of the SFRplus settings & options window, which is opened by clicking on Settings & options in the Rescharts SFRplus setup window. If it is blank or zero, sensitivity will not be calculated. Results ( Ssat , SSOS , and the incident lux level) are displayed in the lower right of the Density response plot in the Tonal response & gamma display. 54 of 451
Imatest Documentation Multicharts The incident light level in lux is entered in the Display area on the right of the Multicharts window when Display is set to 7. Black & White density. If it is blank or zero, sensitivity will not be calculated. Equations General background Results ( Ssat , SSOS , and the incident lux level) are displayed in the lower-right of the Black & White density plot. When Save data is pressed, results appear in CSV file [root name]_multicharts.csv only if Black & White density has been displayed. The two key sensitivity measurements calculated by Imatest are both derived from the same equation. Sensitivity = 10 ⁄ H = 10/(Isensor t) (1) H is the exposure at the image sensor in lux-seconds for the object (test chart patch) used to determine exposure, typically a region of 18% reflectance. Isensor is the illuminance in Lux at the sensor. t is exposure time in seconds. The key issues are how to specify the illuminance at the object plane (i.e., Lux at the test chart) and output signal (i.e., pixel level) corresponding to H, and, the criteria for selecting H. The relationship between test chart luminance and sensor illuminance can be derived from an equation in The manual of photography by Jacobson, Ward, Ray, Attridge, and Axford, Focal Press, Chapter 5, eqn. (5), p. 65, where I = πTLobj ⁄ 4N 2 (2) I is the illuminance at the Image (sensor) plane in lux, T is the lens transmittance fraction, generally assumed to be 0.9, 55 of 451
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