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US 9,177,396 B2Granted
Image processing apparatus and image processing method
AssigneeCanon Kabushiki Kaisha
InventorHiroaki Nashizawa
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Abstract
An image processing apparatus uses an edge component of an input image in which a little low-frequency component of a dark part is retained as a luminance signal, synthesizes a large blurring component generated from the input image as a color component, and realizes a taste of natural watercolor paintings in which gradation is not inverted from a bright part to the dark part when a color is placed on a rough line drawing in watercolor-like processing.
Claims18
An image processing apparatus, comprising:
- one or more computer-readable memory;
- and
- one or more processors that are coupled to the one or more computer-readable memory and that are configured to implement
- an extraction unit configured to extract a high-frequency component and a low-luminance low-frequency component, from luminance data of an input image;
- a color blurring unit configured to perform gradation processing to smooth data on color data of the input image;
- and
- an output unit configured to output image data in which the extracted high-frequency component and the extracted low-luminance low-frequency component output from the extraction unit are used as luminance data and the output from the color blurring unit is used as color data.
4 more elements
An image processing method, comprising:
- extracting a high-frequency component and a low-luminance low-frequency component from luminance data of an input image;
- performing gradation processing to smooth data on color data of the input image;
- and
- outputting image data in which the extracted high-frequency component and the extracted low-luminance low-frequency component are used as luminance data and color data that has been gradation processed is used as color data.
1 more element
An image processing apparatus, comprising;
- a blurred image generating unit configured to generate a first blurred image and a second blurred image, from a same input image, wherein the first blurred image is smaller in a degree of gradation than the second blurred image;
- a gradation correcting unit configured to perform gradation correction processing on the first blurred image;
- an edge extracting unit configured to generate an edge image by subtracting the input image from the first blurred image;
- a gradation inversion unit configured to invert gradation of the edge image;
- a combining unit configured to combine the edge image in which gradation is inverted as luminance data and the second blurred image as color data, to output one image data.
2 more elements
Dependencies are inferred from the claim text.