Macropixel processing system, method and article
AssigneeSTMicroelectronics (Grenoble 2) SAS
InventorsMathieu Thivin, Grégory Roffet
Life of this patent
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Abstract
Tone mapping is performed by digital image processing circuitry on a macro-pixel basis. A luminance value of a macro-pixel of a digital image in a color space is determined. The macro-pixel includes a plurality of individual pixels. Respective tone-mapping gain values of each pixel of the macro-pixel are determined based on the determined luminance value of the macro-pixel. The determined tone-mapping gains are applied to the respective pixels of the macro-pixel. The color space may be a CFA color space, such as a Bayer color space.
Claims25
A method, comprising:
- determining, using digital image processing circuitry, a luminance value of a macro-pixel of a digital image in a color space, the macro-pixel including a plurality of individual pixels;
- determining, using the digital image processing circuitry, respective gain values of each pixel of the macro-pixel based on the determined luminance value of the macro-pixel;
- and
- applying, using the digital image processing circuitry, the determined gain values to the respective pixels of the macro-pixel.
A device, comprising:
- luminance determination circuitry, which, in operation, determines a luminance value of a macro-pixel of a digital image in a color space, the macro-pixel including a plurality of individual pixels;
- gain determination circuitry, which in operation, determines respective gain values of each pixel of the macro-pixel based on the determined luminance value of the macro-pixel;
- and
- gain application circuitry, which, in operation, applies the determined gain values to the respective pixels of the macro-pixel.
A system, comprising:
- an image sensor, which, in operation, generates digital images in a color space;
- and
- digital image tone mapping circuitry, which, in operation:
- determines a luminance value of a macro-pixel of a digital image in the color space, the macro-pixel including a plurality of individual pixels;
- determines respective gain values of each pixel of the macro-pixel based on the determined luminance value of the macro-pixel;
- and
- applies the determined gain values to the respective pixels of the macro-pixel.
A non-transitory computer-readable medium having contents which configure a digital image processing circuit to perform a tone mapping method, the tone mapping method comprising:
- determining a luminance value of a macro-pixel of a digital image in a color space, the macro-pixel including a plurality of individual pixels;
- determining respective gain values of each pixel of the macro-pixel based on the determined luminance value of the macro-pixel;
- and
- applying the determined gain values to the respective pixels of the macro-pixel.
Dependencies are inferred from the claim text.