AUTOFOCUS TECHNIQUE UTILIZING GRADIENT HISTOGRAM DISTRIBUTION CHARACTERISTICS

摘要

A method for estimating if an optical assembly (238) is focused on a scene (12) includes the steps of: capturing information for an image (14) of the scene (12); determining an image gradient histogram distribution (360) of at least a portion of the image (14); determining a Gaussian model gradient histogram distribution (361) of the image (14); and comparing at least a portion of the image gradient histogram distribution (360) to the Gaussian model gradient histogram distribution (361) of the image (14) to estimate if the image (14) is properly focused.