A method is provided for computing a composite image representing a focused image of an object in an application of machine vision in an optical inspection system. An image tessellated into focus regions is evaluated by region for fine feature sharpness. A sharpness image is computed for each focused...http://www.google.com.hk/patents/US7221805?utm_source=gb-gplus-share專利 US7221805 - Method for generating a focused image of an object
