1. An image processing system for a front-view image sensor, comprising: an image sensor so configured and arranged on an own vehicle as to pick up a front-view image in front of the own vehicle; a region setting block so constructed and arranged as to set image processing regions to cover on the front-view image various portions one after another, wherein the portions have different positions in a direction remote from the own vehicle; a feature extracting block so constructed and arranged as to extract a feature out of image processing of the portions of the front-view image covered by the image processing regions set by the region setting block; and a presence judging block so constructed and arranged as to judge the presence of an obstacle based on the feature extracted by the feature extracting block.