Patent ID: 6088468
Filing Date: 2000-07-11
Classification: G06K,G06T

Abstract:
An apparatus for sensing an object within an imaging field of an image pickup device, the apparatus comprising:a memory for storing data of a reference background picture of the imaging field;means for inputting picture data from the image pickup device;means for comparing the inputted picture data with the stored reference background picture data to detect a difference value between the inputted picture data and the stored reference background picture data, and to detect a polarity of the difference value;a converter for converting the difference value into binarization data based on a difference threshold value which is changed in response to the polarity of the difference value so that an object within the imaging field can be distinguished from an area of increased brightness within the imaging field and an area of increased darkness within the imaging field;a calculator for calculating a similarity between the inputted picture data and the stored reference background picture data; anda detector for sensing whether an object is within the imaging field based on the polarity of the difference value and the similarity.