Methods and apparatuses for anti-shading correction with extended color correlated temperature dependency
AssigneeSamsung Electronics Co., Ltd.
InventorEvgeny Ostrovsky
Life of this patent
Estimating the term…
Abstract
In a method for correcting shading effects in an image sensor including a plurality of pixels, shading effects on at least one readout pixel of the image sensor are modeled based on a parametric component, and the shading effects on the at least one readout pixel are corrected based on the modeled shading effects. The parametric component is dependent on at least one of a color channel corresponding to the readout pixel and a color correlated temperature of light incident on the at least one readout pixel.
Claims29
A method for correcting shading effects in an image sensor including a plurality of pixels, the method comprising:
- modeling, at a processing unit of the image sensor, shading effects on at least one readout pixel of the image sensor based on a parametric component and at least one grid component selected from a plurality of grid anti-shading tables, the parametric component being dependent on at least one of a color channel corresponding to the readout pixel and a color correlated temperature of light incident on the at least one readout pixel, and each grid anti-shading table corresponding to a different range of correlated color temperatures;
- and
- correcting the shading effects on the at least one readout pixel based on the modeled shading effects.
A method for correcting shading effects in an image sensor including a plurality of pixels, the method comprising:
- selecting at least one grid component from at least one of at least two grid anti-shading tables based on a color correlated temperature of light incident on at least one readout pixel, each grid anti-shading table corresponding to a different range of correlated color temperatures;
- modeling, at a processing unit of an image sensor, shading effects on the at least one readout pixel based on the at least one selected grid component;
- and
- correcting the shading effects on the at least one readout pixel based on the modeled shading effects.
A method for correcting shading effects in image sensors, the method comprising:
- modeling, at a processing unit of an image sensor, the shading effects in the image sensor by calculating an anti-shading gain function as a function of all color channels of the image sensor;
- and
- correcting the shading effects in the image sensor by applying the calculated anti-shading gain function to each readout pixel of the image sensor;
- wherein
- the anti-shading gain function is calculated based on a current Alpha matrix, which is a function of a plurality of Alpha matrices associated with a set of basic color correlated temperature nodes.
An anti-shading correction apparatus comprising:
- an image signal processor configured to model shading effects on at least one readout pixel of an image sensor based on a parametric component and at least one grid component selected from a plurality of grid anti-shading tables, each grid anti-shading table corresponding to a different range of correlated color temperatures, the image signal processor being further configured to correct shading effects on the at least one readout pixel based on the modeled shading effects;
- wherein
- the parametric component is dependent on at least one of a color channel corresponding to the at least one readout pixel and a color correlated temperature of light incident on the at least one readout pixel.
An anti-shading correction apparatus comprising:
- an image signal processor configured to,
- select at least one grid component from at least one of at least two grid anti-shading tables based on a color correlated temperature of light incident on at least one readout pixel, each grid anti-shading table corresponding to a different range of correlated color temperatures;
- model shading effects on the at least one readout pixel based on the at least one selected grid component;
- and
- correct the shading effects on the at least one readout pixel based on the modeled shading effects.
An anti-shading correction apparatus comprising:
- an image signal processor configured to model shading effects in an image sensor by calculating an anti-shading gain function as a function of all color channels of the image sensor, and configured to correct the shading effects in the image sensor by applying the calculated anti-shading gain function to each readout pixel of the image sensor;
- wherein
- the anti-shading gain function is calculated based on a current Alpha matrix, which is a function of a plurality of Alpha matrices associated with a set of basic color correlated temperature nodes.
Dependencies are inferred from the claim text.