JPS6482183A - Picture recognizing device - Google Patents

Abstract

PURPOSE:To simultaneously recognize a recognition object brighter than a background and a recognition object darker than the background by setting a window on one part of a bright and dark picture, reversing brightness and darkness in the window and after that, recognizing the position, etc., of a bright part or a dark part. CONSTITUTION:When only the bright part is surrounded by the window by a window setting means 5 and the brightness and the darkness in the window are reversed by a brightness darkness reversing means 4, the former bright part becomes the dark part and the brightness of this dark part becomes closer to the dark part outside the window than the background inside the window and the background outside the window. The brightness of the background inside the window becomes closer to the background outside the window than the dark part inside the window and the dark part outside the window. Thus, when a level is set in the middle between the brighter one out of the dark part inside the window and the dark part outside the window and the darker one out of the background inside the window and the background outside the window, the recognition object which is the bright part at the beginning can be recognized simultaneously with the recognition object of the dark part.