Patent ID: 9224051
Filing Date: 2015-12-29
Classification: G06K,G06T

Abstract:
1. A lens-attached matter detector, comprising: an edge extractor that creates an edge image based on an input image from an imager having a lens, divides the edge image into a plurality of areas including a plurality of pixels, and extracts an area where edge intensity is within a threshold range as an attention area; a brightness distribution extractor that obtains a brightness value of the attention area and a brightness value of a circumference area; a brightness change extractor that obtains the brightness value of the attention area and the brightness value of the circumference area obtained by the brightness distribution extractor for a predetermined time interval, and obtains a time series variation in the brightness value of the attention area based on the brightness value of the attention area for the predetermined time interval; and an attached matter determiner that determines the presence or absence of attached matter based on the time series variation in the brightness value of the attention area.