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Vladimir Botchko botchko@lut.fi

Lecture 8. Representation and Lecture 8. Representation and DescriptionDescription

Lappeenranta University of Technology (Finland)

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Representation and DescriptionRepresentation and Description

Representation schemes Boundary descriptors Regional descriptors: textures and moments Morphology

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Representation and DescriptionRepresentation and Description

Representation schemes Boundary descriptors Regional descriptors: textures and moments Morphology

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Representation and DescriptionRepresentation and Description

Representation schemes Boundary descriptors Regional descriptors: textures and moments Morphology

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Some simple descriptors

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Textures. Cooccurrence matrix.

Original image (upper left) (skin, leaves, brick, stone), segmentation based on: conrast (upper right), homogeneity (lower left), standard deviation (lower right)

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Texture Fourier signatures for skin (top) and for leaves: (left), r(right).

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Texture Fourier signatures for brick (top) and stone: (left), r(right).

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Texture segmentation based on autoregression model

From top left to right bottom: an original image, AR model segmentation, smoothing (relaxation), Sobel edge detection, superposition of detected edges and an original image.

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The same for forest fire segmentation (the second image shows training regions)

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Moments

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Representation and DescriptionRepresentation and Description

Representation schemes Boundary descriptors Regional descriptors: textures and moments Morphology

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Morphology