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US 10,708,562 B2Granted
Image signal processing apparatus, image processing circuit, and image processing method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorAkira Moriya
Life of this patent
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Abstract
An image processing circuit includes a gain calculation circuit and a digital amplifier. The gain calculation circuit calculates a first gain with which an average color-difference value in a whole region of a pickup image is brought close to a predetermined convergent point. The digital amplifier performs correction of a white balance of a pixel of the pickup image with a candidate pixel that is of a first candidate pixel calculated based on the first gain and a second candidate pixel calculated based on a second gain associated with each of divided regions and in which a color-difference component is closer to the predetermined convergent point.
Claims11
An image processing circuit comprising:
- a gain calculation circuit configured to calculate a first gain with which an average color-difference value in a whole region of a pickup image is brought close to a predetermined convergent point;
- and
- a digital amplifier configured to perform correction of a white balance of a pixel of the pickup image with one of a first candidate pixel and a second candidate pixel, the first candidate pixel being calculated based on the first gain, the second candidate pixel being calculated based on a second gain associated with each of a plurality of divided regions into which the pickup image is divided, the one of the first candidate pixel and the second candidate pixel being a candidate pixel in which a color-difference component is closer to the predetermined convergent point, the digital amplifier being configured to set the first gain as the second gain in the divided regions in each of which a corrected pixel number is smaller than a predetermined threshold value, the corrected pixel number being a number to which the correction with the second candidate pixel is performed.
An image signal processing apparatus comprising:
- an input circuit configured to receive a pickup image;
- an image processing circuit configured to adjust a white balance of the pickup image, the image processing circuit including
- a gain calculation circuit configured to calculate a first gain with which an average color-difference value in a whole region of the pickup image is brought close to a predetermined convergent point, and
- a digital amplifier configured to perform correction of a white balance of a pixel of the pickup image with one of a first candidate pixel and a second candidate pixel, the first candidate pixel being calculated based on the first gain, the second candidate pixel being calculated based on a second gain associated with each of a plurality of divided regions into which the pickup image is divided, the one of the first candidate pixel and the second candidate pixel being a candidate pixel in which a color-difference component is closer to the predetermined convergent point, the digital amplifier being configured to set the first gain as the second gain in the divided regions in each of which a corrected pixel number is smaller than a predetermined threshold value, the corrected pixel number being a number to which the correction with the second candidate pixel is performed;
- an image signal generation circuit configured to perform a color interpolation process and a color matrix process to the pickup image in which the white balance is adjusted by the image processing circuit;
- an image quality adjustment circuit configured to adjust a luminance and a contrast of the pickup image input from the image signal generation circuit;
- and
- an output circuit configured to output an output image in which the luminance and the contrast are adjusted.
5 more elements
An image processing method comprising:
- calculating a first gain with which an average color-difference value in a whole region of a pickup image is brought close to a predetermined convergent point;
- calculating a first candidate pixel based on the first gain;
- calculating a second candidate pixel based on a second gain associated with each of a plurality of divided regions into which the pickup image is divided;
- performing correction of a white balance of a pixel of the pickup image with one of the first candidate pixel and the second candidate pixel, the one of the first candidate pixel and the second candidate pixel being a candidate pixel in which a color-difference component is closer to the predetermined convergent point;
- and
- setting the first gain as the second gain in the divided regions in each of which a corrected pixel number is smaller than a predetermined threshold value, the corrected pixel number being a number to which the correction with the second candidate pixel is performed.
3 more elements
Dependencies are inferred from the claim text.