Method for detecting directions of regularity in a two-dimensional image
AssigneeZoran (France) S.A.
InventorChristophe Bernard
Life of this patent
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Abstract
When analyzing an image signal having pixel values defined on a sampling grid, the method detects at least one direction of regularity of the image signal in relation to a pixel of the sampling grid. This detection comprises computing a respective loss value associated with at least one direction in a set of directions, and selecting at least one direction of regularity by minimizing the loss value. The loss value associated with a direction (u, v), where u is a horizontal coordinate and v a vertical coordinate, has an axial loss component measuring variations of the pixel values in at least one linear array of pixels. This linear array is a horizontal array if |u/v|>1 and a vertical array if |u/v|<1.
Claims10
A method for analyzing an image signal having pixel values defined on a sampling grid, the method comprising, for detecting at least one direction of regularity of the image signal in relation to a pixel of the sampling grid:
- computing a respective loss value associated with at least one direction in a set of directions;
- and
- selecting at least one direction of regularity by minimizing the loss value,
- wherein the loss value associated with a direction (u, v), where u is a horizontal coordinate and v a vertical coordinate, has an axial loss component measuring variations of the pixel values in at least one linear array of pixels, said linear array being a horizontal array if |u/v|>1 and a vertical array if |u/v|<1.
An apparatus for analyzing an image signal having pixel values defined on a sampling grid, the apparatus comprising an optimizer (30) for detecting at least one direction of regularity of the image signal in relation to a pixel of the sampling grid, the optimizer comprising:
- a processing resource for computing a respective loss value associated with at least one direction in a set of directions;
- and
- a selector for selecting at least one direction of regularity by minimizing the loss value,
- wherein the processing resource comprises a metrics computation unit for computing an axial loss component of the loss value associated with a direction (u, v), where u is a horizontal coordinate and v a vertical coordinate, the axial loss component measuring variations of the pixel values in at least one linear array of pixels, the linear array being a horizontal array if |u/v|>1 and a vertical array if |u/v|<1.
Dependencies are inferred from the claim text.