Image processing apparatus and image processing method

An image processing apparatus that processes image data formed by a set of pixel data of a plurality of pixels, the image processing apparatus comprising:

• a real space filter processing unit that calculates a real space weighting coefficient for each peripheral pixel according to a distance on a real space between a target pixel and a peripheral pixel located around the target pixel among the plurality of pixels of image data input, and performs weighted average of pixel data of the target pixel and pixel data of the peripheral pixel using the real space weighting coefficient to calculate pixel data of the target pixel;
• and
• a color space filter processing unit that calculates a color space weighting coefficient for each peripheral pixel according to a distance on a color space between a target pixel and a peripheral pixel located around the target pixel among the plurality of pixels, and performs weighted average of pixel data of the target pixel and pixel data of the peripheral pixel using the color space weighting coefficient to calculate pixel data of the target pixel, wherein:
• the real space filter processing unit calculates the real space weighting coefficient and performs the weighted average of pixel data, according to filter processing of an edge preservation type;
• the pixel data of at least the target pixel of the pixel data used in the color space filter processing unit is the pixel data calculated by the real space filter processing unit;
• and
• the target pixel and the peripheral pixel directed to the pixel data used in the color space filter processing unit are not adjacent to each other.

An image processing apparatus that processes image data formed by a set of pixel data of a plurality of pixels, the image processing apparatus comprising:

• a real space filter processing unit that calculates a real space weighting coefficient for each peripheral pixel according to a distance on a real space between a target pixel and a peripheral pixel located around the target pixel among the plurality of pixels of image data input, and performs weighted average of pixel data of the target pixel and pixel data of the peripheral pixel using the real space weighting coefficient to calculate pixel data of the target pixel;
• and
• a color space filter processing unit that calculates a color space weighting coefficient for each peripheral pixel according to a distance on a color space between a target pixel and a peripheral pixel located around the target pixel among the plurality of pixels, and performs weighted average of pixel data of the target pixel and pixel data of the peripheral pixel using the color space weighting coefficient to calculate pixel data of the target pixel, wherein:
• the real space filter processing unit calculates the real space weighting coefficient and performs the weighted average of pixel data, according to filter processing of an edge preservation type;
• the pixel data of at least the target pixel of the pixel data used in the color space filter processing unit is the pixel data calculated by the real space filter processing unit;
• the color space is based on luminance and color difference;
• the real space filter processing unit receives an input of image data related to luminance and image data related to color difference, and calculates the real space weighting coefficient and performs the weighted average to calculate the pixel data with respect to each of the image data related to luminance and the image data related to color difference;
• the color space filter processing unit receives an input of the image data related to luminance and the image data related to color difference formed by a set of the pixel data calculated by the real space filter processing unit, and calculates the color space weighting coefficient and performs the weighted average with respect to the image data related to color difference using the image data related to luminance;
• and
• image data related to luminance based on the pixel data calculated in the real space filter processing unit and image data related to color difference based on the pixel data calculated in the color space filter processing unit are output.

An image processing method that processes image data formed by a set of pixel data of a plurality of pixels, the image processing method comprising:

• a real space filter processing step of calculating a real space weighting coefficient for each peripheral pixel according to a distance on a real space between a target pixel and a peripheral pixel located around the target pixel among the plurality of pixels of image data input, and performing weighted average of pixel data of the target pixel and pixel data of the peripheral pixel using the real space weighting coefficient to calculate pixel data of the target pixel;
• and
• a color space filter processing step of calculating a color space weighting coefficient for each peripheral pixel according to a distance on a color space between a target pixel and a peripheral pixel located around the target pixel among the plurality of pixels, and performing weighted average of pixel data of the target pixel and pixel data of the peripheral pixel using the color space weighting coefficient to calculate pixel data of the target pixel, wherein:
• in the real space filter processing step, the real space weighting coefficient is calculated and the weighted average of pixel data is performed, according to filter processing of an edge preservation type;
• the pixel data of at least the target pixel of the pixel data used in the color space filter processing step is the pixel data calculated in the real space filter processing step;
• and
• of the pixel data which the color space filter processing step uses for the weighted average with the color space weighting coefficient, the pixel data of the target pixel is the pixel data calculated in the real space filter processing step, and the pixel data of the peripheral pixel is pixel data forming the image data before the real space filter processing step.

An image processing method that processes image data formed by a set of pixel data of a plurality of pixels, the image processing method comprising:

• a real space filter processing step of calculating a real space weighting coefficient for each peripheral pixel according to a distance on a real space between a target pixel and a peripheral pixel located around the target pixel among the plurality of pixels of image data input, and performing weighted average of pixel data of the target pixel and pixel data of the peripheral pixel using the real space weighting coefficient to calculate pixel data of the target pixel;
• and
• a color space filter processing step of calculating a color space weighting coefficient for each peripheral pixel according to a distance on a color space between a target pixel and a peripheral pixel located around the target pixel among the plurality of pixels, and performing weighted average of pixel data of the target pixel and pixel data of the peripheral pixel using the color space weighting coefficient to calculate pixel data of the target pixel, wherein:
• in the real space filter processing step, the real space weighting coefficient is calculated and the weighted average of pixel data is performed, according to filter processing of an edge preservation type;
• the pixel data of at least the target pixel of the pixel data used in the color space filter processing step is the pixel data calculated in the real space filter processing step;
• and
• the target pixel and the peripheral pixel directed to the pixel data used in the color space filter processing step are not adjacent to each other.

An image processing method that processes image data formed by a set of pixel data of a plurality of pixels, the image processing method comprising:

• a real space filter processing step of calculating a real space weighting coefficient for each peripheral pixel according to a distance on a real space between a target pixel and a peripheral pixel located around the target pixel among the plurality of pixels of image data input, and performing weighted average of pixel data of the target pixel and pixel data of the peripheral pixel using the real space weighting coefficient to calculate pixel data of the target pixel;
• and
• a color space filter processing step of calculating a color space weighting coefficient for each peripheral pixel according to a distance on a color space between a target pixel and a peripheral pixel located around the target pixel among the plurality of pixels, and performing weighted average of pixel data of the target pixel and pixel data of the peripheral pixel using the color space weighting coefficient to calculate pixel data of the target pixel, wherein:
• in the real space filter processing step, the real space weighting coefficient is calculated and the weighted average of pixel data is performed, according to filter processing of an edge preservation type;
• the pixel data of at least the target pixel of the pixel data used in the color space filter processing step is the pixel data calculated in the real space filter processing step;
• the color space is based on luminance and color difference;
• in the real space filter processing step, an input of image data related to luminance and image data related to color difference is received, and the real space weighting coefficient is calculated and the weighted average is performed to calculate the pixel data with respect to each of the image data related to luminance and the image data related to color difference;
• in the color space filter processing step, an input of the image data related to luminance and the image data related to color difference formed by a set of the pixel data calculated in the real space filter processing step is received, and the color space weighting coefficient is calculated and the weighted average is performed with respect to the image data related to color difference using the image data related to luminance;
• and
• image data related to luminance based on the pixel data calculated in the real space filter processing step and image data related to color difference based on the pixel data calculated in the color space filter processing step are output.