Patent ID: 6061091
Filing Date: 2000-05-09
Classification: G06T

Abstract:
A method for detecting and processing a specular image density level X.sub.1 and a highlight image density level X.sub.2 in an illuminated scene comprising the following steps:exposing a photo-sensitive means by a luminous image from said scene, thereby generating a plurality of digital image signals, each said digital image signal representing a density of a portion of said luminous image;establishing a cumulative histogram for the image density levels of said digital image signals;providing a reference specular cumulative frequency Y.sub.1 ;providing a reference highlight cumulative frequency Y.sub.2 ;converting said specular cumulative frequency Y.sub.1 via said cumulative histogram, to obtain said specular image density level X.sub.1 ;converting said highlight cumulative frequency Y.sub.2 via said cumulative histogram, to obtain said highlight image density level X.sub.2 ; andindicating a presence of specular reflections when a ratio .alpha.=.parallel.X.sub.MAX -X.sub.2 .parallel./.parallel.X.sub.MAX -X.sub.1 .parallel. is smaller than a predetermined value, wherein X.sub.MAX is an image density level greater than or equal to a highest density level within said luminous image.