Colour bit-stealing to enhance the luminance resolution of digital displays on a single pixel basis CHRISTOPHER W. TYLER* Smith-Kettlewell Eye Research Institute, 2232 Webster St., San Francisco, CA 94115, USA Received 20 February 1996; revised 5 December 1996; accepted 5 December 1996 Abstract-A look-up table algorithm is described for enhancing the luminance resolution at the expense of the colour resolution in digital displays of colour images. For colour displays with a look-up table resolution of 8 bits/gun, the algorithm provides a luminance resolution of 11-12 bits without loss of spatial or temporal resolution. This improvement can reduce the minimum luminance step in the mid-luminance range from 1.5% to > 0.2% with no additional hardware. INTRODUCTION Much psychophysical testing involves the measurement of contrast sensitivity for spatial patterns specified with some mathematical luminance profile and a controlled time course. Although desk-top computers are well-suited for such a task, most of the software for such computers requires special-purpose hardware modifications and software that requires programming to achieve the desired experimental configuration. The difficulty is to present stimuli with sufficient resolution of fine contrast variations to allow measurement of human contrast sensitivity, which can be as low as a 0.2% difference
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 1997
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