Image analysis – Applications – Target tracking or detecting
Patent
1996-05-07
2000-07-11
Chang, Jon
Image analysis
Applications
Target tracking or detecting
342454, 348169, 382219, G06K 900
Patent
active
060884681
ABSTRACT:
An apparatus for sensing an object within an imaging field of an image pickup device includes a memory for storing data of a reference background picture of the imaging field, a device for inputting picture data from the image pickup device, a device 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, and a detector for sensing whether an object is within the imaging field based on the polarity of the difference value and the similarity.
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Ito Wataru
Ueda Hirotada
Chang Jon
Hitachi Denshi Kabushiki Kaisha
Patel Jayanti K.
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