A handheld imaging device has a data receiver that is configured to receive reference
encoded image data. The data includes reference code values, which are encoded by an
external coding system. The reference code values represent reference gray levels, which are
5 being selected using a reference grayscale display function that is based on perceptual
non-linearity of human vision adapted at different light levels to spatial frequencies. The
imaging device also has a data converter that is configured to access a code mapping between
the reference code values and device-specific code values of the imaging device. The
device-specific code values are configured to produce gray levels that are specific to the
0 imaging device. Based on the code mapping, the data converter is configured to transcode the
reference encoded image data into device-specific image data, which is encoded with the
device-specific code values.
WO 2013/086169 PCT/US2012/068212
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CSFs for Light Adaptation Range (1000->.001 cd/n 2 )
03
0 101
0.- - -------------------------------------------
100 101
I-IU 7 Spatial Frequency (cy/deg)
CSFs for Light Adaptation Range(1 00->0001 cd/n 2 )
03
02
10 101
F-11GO. 2Spatial Frequency (cyldeg)