US 12,707,158 B2 · Image sensor, image signal processor, and operating method of image signal processor

Abstract

A method of operating an image signal processor includes storing, by a color shading profile storage circuit, region-specific color shading values extracted from first image data, obtaining, by a region of interest-obtaining circuit, a region of interest, receiving, by a global white balance gain-receiving circuit, a global white balance gain from an application processor, calculating, by a region-specific white balance gain-calculating circuit, region-specific color shading weights, based on a first color shading value of the region of interest and a second color shading value for each region, calculating, by the region-specific white balance gain-calculating circuit, region-specific white balance gains, based on the global white balance gain and the region-specific color shading weights, and correcting, by a white balance-correcting circuit, white balance of second image data, based on the region-specific white balance gains.

Claims20

Dependent claims

A method of operating an image signal processor, the method comprising:

storing region-specific color shading values extracted from first image data associated with an image;
obtaining information identifying a region of interest of the image;
receiving a global white balance gain;
calculating region-specific color shading weights based on a first color shading value of the region of interest and a second color shading value for each region of the image;
calculating region-specific white balance gains based on the global white balance gain and the region-specific color shading weights;
and
correcting white balance of second image data associated with the image based on the region-specific white balance gains.

4 more elements

An image signal processor comprising:

a color shading profile storage circuit configured to store region-specific color shading values extracted from first image data associated with an image;
a region of interest-obtaining circuit configured to obtain information identifying a region of interest of the image;
a global white balance gain-receiving circuit configured to receive a global white balance gain from an application processor;
a region-specific white balance gain-calculating circuit configured to calculate region-specific color shading weights based on a first color shading value of the region of interest and a second color shading value for each region of the image, and configured to calculate region-specific white balance gains based on the global white balance gain and the region-specific color shading weights;
and
a white balance-correcting circuit configured to correct white balance of second image data associated with an image based on the region-specific white balance gains.

3 more elements

An image sensor comprising:

a memory configured to store region-specific color shading values extracted from first image data generated at a first point in time;
and
an image signal processor configured to obtain a region of interest for second image data generated at a second point in time after the first point in time, receive a global white balance gain from an application processor, extract a first color shading value of the region of interest from the region-specific color shading values stored in the memory, calculate region-specific color shading weights, based on the first color shading value and the region-specific color shading values, calculate region-specific white balance gains, based on the global white balance gain and the region-specific color shading weights, and correct white balance of the second image data, based on the region-specific white balance gains.

Dependencies are inferred from the claim text.

Image sensor, image signal processor, and operating method of image signal processor

Life of this patent

Image sensor, image signal processor, and operating method of image signal processor

Life of this patent

Abstract

Claims20