Method and apparatus for sensing object located within visual field of imaging device

摘要

An apparatus and a method is provided for sensing an object within an imaging field of an imaging device (121). The data of the reference background picture taken within the imaging field is stored in a storage unit (124). The data of the picture taken by the imaging device (121) is read. The data of the reference background picture is compared with the read picture data at each pixel so that the difference value between both of the data may be yielded. The difference value is compared with a predetermined threshold value at each pixel. Based on the compared result, binarization data about an image of the object is produced. Based on the binarization data, the object is sensed. Then, the data of the reference background picture stored in the storage unit (124) is properly updated with the new data.