Tuesday, February 12, 2019

Productive Use of Black Sun Effect

Finally, somebody found the use for black sun effect in a productive way. MDPI publishes Sungkyunkwan University, Korea paper "Accurate and Cost-Effective Micro Sun Sensor based on CMOS Black Sun Effect" by Rashid Saleem and Sukhan Lee.

"An accurate and cost-effective micro sun sensor based on the extraction of the sun vector using a phenomenon called the “black sun” is presented. Unlike conventional image-based sun sensors where there is difficulty in accurately detecting the sun center, the black sun effect allows the sun center to be accurately extracted even with the sun image appearing irregular and noisy due to glare. This allows the proposed micro sun sensor to achieve high accuracy even when a 1 mm × 1 mm CMOS image sensor with a resolution of 250 × 250 pixels is used."


  1. A feature to improve localization of a bright object in a specific image?

  2. Cloud trackers have been doing this for a few years already:

    The problem nowadays is to find a cheap security camera that still shows this effect...


  3. "The resulting black-Sun artifact prompted an exploration of Sun-based measurements of orientation, and a preliminary Sun Matching module was developed that uses the Sun’s location in the camera image to generate a measurement of the camera’s absolute orientation."

    Gans, Eric, et al. "Augmented reality technology for day/night situational awareness for the dismounted Soldier." Display technologies and applications for defense, security, and avionics IX; and head-and helmet-mounted displays XX. Vol. 9470. International Society for Optics and Photonics, 2015.


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