Colorimetric and Photometric Compensation for Optical See-Through Displays

Abstract

Optical see-through displays are an established technology within augmented reality. Wearing such a display the users eyes automatically adapt to the luminance of the real world environment, while the virtual part is displayed using a steadybrightness. This often results in clear differences between real and virtual elements. This paper shows a technique for colorimetric compensation which avoids this effect. Furthermore algorithms for photometric compensation will be demonstrated. The appearance of background shapes and colours arise from the combination of the luminance of the background and the projected luminance of the object. These "ghosts" are photometrically compensated.

SmartColor: Real-time color correction and contrast for optical see-through head-mounted displays

“…However, existing color correction algorithms are not usable. Weiland et al proposed several correction algorithms which often result on black or depend on arbitrary constants [24]. Sridharan et al proposed a solution which evaluates a subset of all possible display colors; returning the best possible solution but not computable in real time [22].…”

Color correction for optical see-through displays using display color profiles

“…While these works deal primarily in the device dependent RGB space, others achieved higher correction accuracy by working on the device independent CIE XYZ color space [Ashdown et al 2006] [Menk and Koch 2011]. Weiland et al [2009] applied color correction to optical see-through displays. Their system is based on ] with a camera on top of the display to capture the background.…”

“…Ideally, display manufacturers should provide such profile and make it available for developers. In a head-mounted display, the system can use a digital camera for a pixel level mapping of the background and the display image such as in ] [Weiland et al 2009]. However, accurate color measurement via a digital camera itself a complex task [Hong et al 2001], especially for changing light conditions like the outdoors.…”

“…Existing solutions include using a spatial light modulator (SLM) to block background light [Kiyokawa et al 2002[Kiyokawa et al ][2003, an approach requiring extra hardware on the display at the cost of non-transparency. Color correction is another solution where the system finds an alternative digital color which, upon blending with the background, comes closest to the desired color [Weiland et al 2009]. …”

“…We validate the use of BPs in our color blending model against four other methods of estimating how a display renders color: the direct method (DM) and three chromatic adaptation transformation (CAT) methods. The direct method ignores that each display renders colors differently (called "trivial correction" by Weiland et al[2009]). The CAT methods use known color transformation matrices based on the brightest white of the display.…”