Method and apparatus for moving object extraction based on background subtraction
First Claim
1. A method of moving object extraction based on background subtraction, comprising the steps of:
- (a) sequentially entering input images containing a moving object region to be extracted;
(b) storing temporal changes of image feature parameter values for sub-regions subdividing a frame of each input image entered at the step (a);
(c) statistically processing a temporal change of the image feature parameter values for each sub-region within a prescribed target region of the frame stored at the step (b) over a prescribed period of time t0 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 t0, so as to obtain a reconstructed background image;
(d) applying a subtraction processing to one of the input images entered at the step (a) and the reconstructed background image obtained at the step (c) to obtain a subtraction image; and
(e) applying a binarization processing to the subtraction image obtained at the step (d) to extract the moving object region from the input images entered at the step (a).
1 Assignment
0 Petitions
Accused Products
Abstract
A moving object extraction based on background subtraction capable of stably extracting the moving object under various environments. Temporal changes of image feature parameter values for sub-regions subdividing a frame of each input image are stored, and the background image is reconstructed by statistically processing a temporal change of the image feature parameter values for each sub-region within a prescribed target region of the frame over a prescribed period of time to obtain the statistical quantity characterizing that temporal change, judging whether that temporal change is due to an illumination change or not according to the obtained statistical quantity and a prescribed illumination change judging condition, and updating a background image value for each sub-region by a new background image value according to the image feature parameter values for each sub-region during the prescribed period of time. Then, a subtraction processing is applied to one of the input images and the reconstructed background image, and a binarization processing is applied to the obtained subtraction image so as to extract the moving object region from the input images.
-
Citations
40 Claims
-
1. A method of moving object extraction based on background subtraction, comprising the steps of:
-
(a) sequentially entering input images containing a moving object region to be extracted; (b) storing temporal changes of image feature parameter values for sub-regions subdividing a frame of each input image entered at the step (a); (c) statistically processing a temporal change of the image feature parameter values for each sub-region within a prescribed target region of the frame stored at the step (b) over a prescribed period of time t0 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 t0, so as to obtain a reconstructed background image; (d) applying a subtraction processing to one of the input images entered at the step (a) and the reconstructed background image obtained at the step (c) to obtain a subtraction image; and (e) applying a binarization processing to the subtraction image obtained at the step (d) to extract the moving object region from the input images entered at the step (a). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. 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 t0 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 t0, 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. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
-
Specification