Image processing apparatus, image processing method, and camera
AssigneeSony Corporation
InventorAtsushi Kobayashi
Life of this patent
Estimating the term…
Abstract
In an image processing apparatus for processing the output signal of a CCD area sensor having a color filter with a Bayer arrangement of red, green, and blue primary colors, a VH-correlation detecting section calculates, according to four pieces of pixel information in four directions of the right and left directions (horizontal direction) and the upper and lower directions (vertical direction) from a pixel to be interpolated, correlation values in the four directions, for example, for green. According to these correlation values, interpolation coefficients are determined. Interpolation data is multiplied by the interpolation coefficients in multipliers and the results are summed up in adders to implement interpolation processing.
Claims18
An image processing apparatus for processing the output signal of a solid-state imaging device having a color filter with a specified color arrangement, comprising:
- a correlation-value calculation circuit for calculating correlation values according to at least four pieces of pixel information adjacent to a pixel to be interpolated, the four pieces of pixel information being positioned in four directions from the pixel to be interpolated, and which form angles of 90 degrees with each other;
- a coefficient determination circuit for determining interpolation coefficients according to the correlation values in the four directions calculated by said correlation-value calculation circuit;
- and
- an interpolation processing circuit for performing interpolation according to the four pieces of pixel information and the interpolation coefficients and for generating image data in accordance with said interpolation;
- wherein said coefficient determination circuit determines a correlation mode according to a magnitude relationship among the correlation values in the four directions and selects one of a plurality of calculating procedures for calculating the interpolation coefficients according to the correlation mode.
An image processing apparatus for processing the output signal of a solid-state imaging device having a color filter with a specified color arrangement, comprising:
- a correlation-value calculation circuit for calculating correlation values according to at least four pieces of pixel information adjacent to a pixel to be interpolated, the four pieces of pixel information being positioned in four directions from the pixel to be interpolated, and which form angles of 90 degrees with each other;
- a coefficient determination circuit for determining interpolation coefficients according to the correlation values in the four directions calculated by said correlation-value calculation circuit;
- and
- an interpolation processing circuit for performing interpolation according to the four pieces of pixel information and the interpolation coefficients and for generating image data in accordance with said interpolation;
- wherein said interpolation processing circuit generates first image data by interpolation processing based on the first-system interpolation coefficients and generates second image data by interpolation processing based on the second-system interpolation coefficients.
An image processing apparatus for processing the output signal of a solid-state imaging device having a color filter with a specified color arrangement, comprising:
- a correlation-value calculation circuit for calculating correlation values according to at least four pieces of pixel information adjacent to a pixel to be interpolated, the four pieces of pixel information being positioned in four directions from the pixel to be interpolated, and which form angles of 90 degrees with each other;
- a coefficient determination circuit for determining interpolation coefficients according to the correlation values in the four directions calculated by said correlation-value calculation circuit;
- and
- an interpolation processing circuit for performing interpolation according to the four pieces of pixel information and the interpolation coefficients and for generating image data in accordance with said interpolation;
- wherein said coefficient determination circuit includes an interpolation-coefficient calculation circuit for calculating an interpolation coefficient for a certain color having a pixel density in two opposite directions smaller than a pixel density of the pixels for the other colors of the solid-state imaging device by comparing correlation values in two opposite directions for the certain colors color.
An image processing method for processing the output signal of a solid-state imaging device having a color filter with a specified color arrangement, comprising the steps of:
- calculating correlation values, according to at least four pieces of pixel information adjacent to a pixel to be interpolated, the four pieces of pixel information being positioned in four directions from the pixel to be interpolated, and which form angles of 90 degrees with each other;
- determining interpolation coefficients according to the calculated correlation values in the four directions;
- performing interpolation processing according to the four pieces of pixel information and the determined interpolation coefficients;
- generating image data in accordance with said interpolation;
- and
- determining a correlation mode according to a magnitude relationship among the correlation values in the four directions and selecting one of a plurality of calculating procedures for calculating the interpolation coefficients according to the correlation mode.
A camera comprising:
- a solid-state imaging device having a color filter with a specified color arrangement;
- an optical system for forming an image of an object on said solid-state imaging device;
- and
- an image processing apparatus for processing an output signal of said solid-state imaging device,
- said image processing apparatus including:
- a correlation-value calculation circuit for calculating correlation values according to at least four pieces of pixel information adjacent to a pixel to be interpolated, the four pieces of pixel information being positioned in four directions from the pixel to be interpolated, and which form angles of 90 degrees with each other;
- a coefficient determination circuit for determining interpolation coefficients according to the correlation values in the four directions calculated by said correlation-value calculation circuit;
- an interpolation processing circuit for performing interpolation according to the four pieces of pixel information and the interpolation coefficients and for generating image data in accordance with said interpolation;
- and
- determining a correlation mode according to a magnitude relationship among the correlation values in the four directions and selecting one of a plurality of calculating procedures for calculating the interpolation coefficients according to the correlation mode.
Dependencies are inferred from the claim text.