Apparatus and method for detecting foreground in image
First Claim
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1. An apparatus for detecting a foreground in an image, the apparatus comprising:
- a memory configured to store instructions; and
a processor configured to execute the instructions to;
estimate context information, including a foreground speed, on a scene from an image frame of the image;
construct a background model of the image frame using the estimated context information; and
detect a foreground from the image frame based on the constructed background model,wherein the foreground speed is estimated by calculating a speed using an optical flow of the image frame and a previous image frame, and correcting the speed based on a projective transform matrix that represents background motion.
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Abstract
An apparatus and method for detecting a foreground in an image is provided, and the foreground detecting apparatus includes a context information estimator configured to estimate context information on a scene from an image frame of the image, a background model constructor configured to construct a background model of the image frame using the estimated context information, and a foreground detector configured to detect a foreground from the image frame based on the constructed background model.
24 Citations
22 Claims
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1. An apparatus for detecting a foreground in an image, the apparatus comprising:
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a memory configured to store instructions; and a processor configured to execute the instructions to; estimate context information, including a foreground speed, on a scene from an image frame of the image; construct a background model of the image frame using the estimated context information; and detect a foreground from the image frame based on the constructed background model, wherein the foreground speed is estimated by calculating a speed using an optical flow of the image frame and a previous image frame, and correcting the speed based on a projective transform matrix that represents background motion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of detecting a foreground in an image, the method comprising:
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estimating context information, including a foreground speed, on a scene from an image frame of the image; constructing a background model of the image frame using the estimated context information; correcting a variance of the constructed background model, dependent on whether a value of a context variable based on the foreground speed is greater than or equal to a block size; and detecting a foreground from the image frame based on the variance-corrected constructed background model. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A digital device, comprising:
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an antenna; a cellular radio configured to transmit and receive data via the antenna according to a cellular communications standard; a touch-sensitive display; a camera configured to capture an image; a memory configured to store instructions; and a processor configured to execute the instructions to receive the image from the camera, estimate context information, including an illumination change, on a scene from an image frame of the image, construct a background model of the image frame using the estimated context information, update a mean of the constructed background model by reflecting the illumination change, dependent on whether a value of a context variable is smaller than a block size, and detect a foreground from the image frame based on the constructed background model.
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Specification