Image background replacement method
First Claim
Patent Images
1. A method of image processing comprising the steps of:
- (a) determining a probability that an input pixel is one of a background and a foreground pixel of said image by comparing said input pixel to a background reference pixel model; and
(b) revising said probability for said input pixel according to a probability that a neighboring pixel is a pixel of one of said background and said foreground and a relationship of said input pixel and a pixel structure included in said image.
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Abstract
An image'"'"'s pixels are initially segmented into pixels of the image foreground and background by comparing the pixels of the image to updated models of background reference pixels. Pixel structures are identified in the image. The probability that a pixel is in the background or foreground is refined by considering the initial segmentation of the pixel'"'"'s neighbors and the pixel'"'"'s membership in a pixel structure. If a pixel is identified as a background pixel it is replaced by a pixel of a new background.
142 Citations
66 Claims
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1. A method of image processing comprising the steps of:
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(a) determining a probability that an input pixel is one of a background and a foreground pixel of said image by comparing said input pixel to a background reference pixel model; and
(b) revising said probability for said input pixel according to a probability that a neighboring pixel is a pixel of one of said background and said foreground and a relationship of said input pixel and a pixel structure included in said image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of segmenting an image, said method comprising the steps of:
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(a) capturing said image comprising a plurality of input pixels representing a background and a foreground of a scene;
(b) capturing a background reference image comprising a plurality of background reference pixels representing said background of said scene;
(c) classifying an input pixel as one a pixel of said background and said foreground according to a relationship of said input pixel to a background reference pixel;
(d) identifying a structure in said input image; and
(e) revising said classification of said input pixel according to a membership of said input pixel in said structure. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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26. A method of segmenting an image comprising the steps of:
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(a) capturing said image comprising a plurality of input pixels representing a background and a foreground of a scene;
(b) capturing a background reference image comprising a plurality of background reference pixels representing a background of said scene;
(c) determining a probability that an input pixel is a pixel of one of said background and said foreground according to a relationship of a value measuring said input pixel and a value measuring a background reference pixel;
(d) identifying a pixel structure in said image;
(f) revising said probability for said input pixel according to a membership of said input pixel in said pixel structure and a probability that a neighboring pixel is a pixel of one of said background and said foreground; and
(g) revising said value measuring said a background reference pixel according to a relationship of said background reference pixel and said input pixel.
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43. A method of processing an image comprising the steps of:
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(a) capturing an image comprising a plurality of input pixels representing a background and a foreground of a scene;
(b) capturing a background reference image comprising a plurality of background reference pixels representing a background of said scene;
(c) determining a probability that an input pixel is a pixel of one of said background and said foreground according to a relationship of said input pixel and a background reference pixel;
(d) identifying a pixel structure in said image;
(f) revising said probability for said input pixel according to a membership of said input pixel in said pixel structure and a probability that a neighboring pixel is a pixel of one of said background and said foreground; and
(g) substituting a new background pixel for a spatially corresponding input pixel classified as a background pixel. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64, 65, 66)
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59. A method of replacing an image background in a video sequence comprising the steps of:
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(a) capturing an image comprising a plurality of input pixels representing a background and a foreground of a scene;
(b) capturing a background reference image comprising a plurality of background reference pixels representing a background of said scene;
(c) classifying an input pixel as a pixel of said background if a difference between said input pixel and a background reference pixel is less than a threshold difference;
(d) filtering said image to identify a pixel structure included in said image;
(e) revising said classification of said input pixel according to a first probability relationship if said input pixel is a pixel of said pixel structure;
(f) revising said classification of said input pixel according to a second probability relationship if said input pixel is not a pixel of said pixel structure;
(g) revising a background reference pixel if said revised classification of a spatially corresponding input pixel classifies said input pixel as a background pixel;
(h) substituting a new background pixel for said input pixel if said input pixel is classified as a pixel of said background; and
(i) capturing another image comprising a plurality of input pixels representing a background and a foreground of said scene.
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Specification