Image signal processor and method for processing image signal
AssigneeSK hynix Inc.
InventorCheol Jon Jang
Life of this patent
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Abstract
An image signal processor, and a method for processing an image signal, include a directionality strength determiner, a half-directional pattern determiner, and a pixel interpolator. The directionality strength determiner divides a target kernel including a target pixel into a plurality of sub-kernels, and generates gradient sum information by calculating directionality strength of each of the plurality of sub-kernels. The half-directional pattern determiner determines whether a half-directional edge pattern is included in each of the sub-kernels in response to the gradient sum information. The pixel interpolator interpolates the target pixel in response to the edge pattern determined by the half-directional pattern determiner.
Claims18
An image signal processor comprising:
- a directionality strength determiner configured to divide a target kernel including a target pixel into a plurality of sub-kernels, and generate gradient sum information by calculating directionality strength of each of the plurality of sub-kernels;
- a half-directional pattern determiner configured to determine whether a half- directional edge pattern is included in each of the sub-kernels in response to the gradient sum information;
- and
- a pixel interpolator configured to interpolate the target pixel in response to the edge pattern determined by the half-directional pattern determiner,
- wherein the half-directional pattern determiner includes:
- a half-edge pattern determiner configured to determine a half-edge pattern corresponding to a kernel including the target pixel in response to the gradient sum information;
- a first edge pattern determiner configured to detect a first edge pattern corresponding to a kernel including the target pixel in response to the gradient sum information;
- and
- a second edge pattern determiner configured to detect a second edge pattern corresponding to a kernel including the target pixel in response to the gradient sum information,
- wherein the half-edge pattern determiner is configured to:
- determine that the half-edge pattern is included in the target kernel, when a first smallest gradient sum from among the gradient sum information is smaller than remaining gradient sums other than the first smallest gradient sum by a predetermined threshold or greater.
A method for processing an image signal comprising:
- converting pixels included in a target kernel having a target pixel into pixels having the same color by converting a gain of a color pixel;
- dividing the target kernel into a plurality of sub-kernels;
- calculating a gradient sum in a direction corresponding to positions of the plurality of sub-kernels;
- determining a half direction using the gradient sum;
- compensating for a full edge pattern when a result of determination of the half direction is not the half direction, and determining a type of an edge pattern when a result of determination of the half direction is the half direction;
- and
- compensating for an edge pattern in response to the type of the edge pattern.
Dependencies are inferred from the claim text.