| 摘要 |
The invention relates to a photometric model which includes at least one Gaussian model of a measurable physical quantity in an image provided by the camera and which is defined by the mean and the variance of the physical quantity. The device comprises: means for calculating the mean from the current value of the physical quantity, said means including a first closed loop-mounted summer; means for measuring the difference between the mean and the current value of the physical quantity, said means including a second summer; means for reducing the difference, said means including an automatic regulator. The first summer, second summer and automatic regulator are assembled in a closed loop control of the first summer, so as to update the model slowly during a period of stability of the observed scene and quickly during a period of transition of the observed scene. The invention is used for video surveillance and background subtraction. |
