Method and apparatus for moving object extraction based on background subtraction

An apparatus for moving object extraction based on background subtraction, comprising:

• input means for sequentially entering input images containing a moving object region to be extracted;
• storage means for storing temporal changes of image feature parameter values for sub-regions subdividing a frame of each input image entered by the input means;
• background update means for statistically processing a temporal change of the image feature parameter values for each sub-region within a prescribed target region of the frame stored by the storage means over a prescribed period of time t.sub.0 to obtain at least one statistical quantity characterizing said temporal change, judging whether said temporal change is due to an illumination change or not according to said statistical quantity and a prescribed illumination change judging condition, and updating a background image value for said each sub-region by a new background image value according to the image feature parameter values for said each sub-region during the prescribed period of time t.sub.0, so as to obtain a reconstructed background image;
• subtraction means for applying a subtraction processing to one of the input images entered by the input means and the reconstructed background image obtained by the background update means to obtain a subtraction image;
• and
• binarization means for applying a binarization processing to the subtraction image obtained by the subtraction means to extract the moving object region from the input images entered by the input means.