Image processing apparatus and method, and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorKenta Matsui
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Abstract
The object of the present invention is to appropriately determine an attribute of a synthesized pixel at the time of synthesizing processing. An attribute of a pixel, synthesized based on a transmissivity α of a source pixel, is determined in the following manner. A threshold value T is obtained from attribute designation data (S603), the transmissivity α is compared with the threshold value T (S604), and if the transmissivity α is larger than the threshold value T, an attribute of a destination pixel is determined as the attribute of the synthesized pixel (S605), while if the transmissivity α is smaller than the threshold value T, an attribute of a source pixel is determined as the attribute of the synthesized pixel (S606).
Claims18
An image forming apparatus comprising:
- a color determination unit that determines color information of a pixel to be synthesized based upon a color of a source pixel, a color of a destination pixel and a transmissivity,
- an attribute determination unit that determines attribute information of the pixel to be synthesized based upon attribute information of the source pixel, attribute information of the destination pixel and the transmissivity, wherein the attribute information of a pixel indicates that the pixel belongs to which of an image, a graphic or a character;
- and
- an image processing unit that performs image processing based upon the attribute information of each pixel determined by said attribute determination unit.
An image forming method comprising:
- a color determining step of determining color information of a pixel to be synthesized based upon a color of a source pixel, a color of a destination pixel and a transmissivity, and
- an attribute determining step of determining attribute information of the pixel to be synthesized based upon attribute information of the source pixel, attribute information of the destination pixel and the transmissivity, wherein the attribute information of a pixel indicates that the pixel belongs to which of an image, a graphic or a character;
- and
- an image processing step of performing an image processing based upon the attribute information of each pixel determined in said attribute determining step.
A computer program embodied on a computer-readable storage medium, comprising:
- a color determining step of determining color information of a pixel to be synthesized based upon a color of a source pixel, a color of a destination pixel and a transmissivity, and
- an attribute determining step of determining attribute information of the pixel to be synthesized based upon attribute information of the source pixel, attribute information of the destination pixel and the transmissivity, wherein the attribute information of a pixel indicates that the pixel belongs to which of an image, a graphic or a character;
- and
- an image processing step of performing an image processing based upon the attribute information of each pixel determined in said attribute determining step.
Dependencies are inferred from the claim text.