SUN LOCATION PREDICTION IN IMAGE SPACE WITH ASTRONOMICAL ALMANAC-BASED CALIBRATION USING GROUND BASED CAMERA
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United States of America Patent
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app pub date -
May 13, 2015
filing date -
Apr 17, 2014
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Abstract
A method for predicting location of the sun in an image space. The method includes providing a set of calibration images and offline intrinsic calibration of a camera and optical element. An extrinsic parameter calibration is then performed based on the calibration images and mapping between local three dimensional coordinates and real world three dimensional coordinates to provide an extrinsic projection matrix. The method also includes providing a real time image of the sky and determining sun location in spherical space based on the extrinsic projection matrix and a real time sun location in the world coordinate system for the real time image. A three dimensional vector is then mapped to provide a corrected two dimensional ideal point. Next, an inverse affine transformation is performed to provide a two dimensional real image point in image space.
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