METHOD FOR EXTRACTING AREA OF MOVING OBJECT BASED UPON BACKGROUND DIFFERENCE

Japanese Patent JP3123587

B2

PURPOSE: To stably extract a moving object such as a human or a vehicle even in a condition such as outdoors frequently generating variation in illumination or a condition moderately changing a background by executing difference processing between an input image in a required area and a background image to be sequentially updated.
CONSTITUTION: Monochromatic continuous frame pictures are obtained from a camera 001 and the luminous values of respective small areas ak are obtained equally to the number of frame pictures during the period of t0. In a small area a1, frequency distribution 213 is obtained and the statistic degree of dispersion σ indicates a small value. On the other hand, a moving object is photographed in a small area a2, so that its luminance value is sharply changed during the period of t0 and expresses dispersion like frequency distribution 214 and the degree of dispersion σ indicates a large value. Accordingly, the degree of dispersion obtained when illumination is sharply changed, is set up as σ0, the value σ0 is compared with the value σ and when the σ is smaller, it is regarded as change in the luminance value due to the variation of illumination and the value of the small area of the background is updated. When the value σ is larger, it is judged as a change in luminance due to a factor such as the appearance of a moving object other than iiiuminance variation and the value of the small area in tlxe background image is not updated.

Hitoshi Tsuchikawa
Atsushi Sato
Akira Banno
Kenichiro Ishii

JP2922095A

January 15, 2001

February 17, 1995

Click for automatic bibliography generation  

Nippon Telegraph and Telephone Corporation

H04N7/18; G06K9/00; G06T1/00; G06T7/20; G06T9/00; (IPC1-7): G06T1/00; H04N7/18

JP652311A
JP2236788A
JP5266196A
JP549031A
JP676047A

Hidekazu Miyoshi (1 outside)

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