Image processing method and apparatus and recording medium
AssigneeCanon Kabushiki Kaisha
InventorTakatoshi Ohta
Life of this patent
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Abstract
An image processor converts an input signal into first and second color components and a component. A plurality of output device dependent color-component data is read from a look-up table on the basis of the first and second color components and the brightness component. Interpolation processing is performed on the basis of the read plurality of color component data to generate output device dependent color-component data corresponding to the input signal.
Claims10
An image processing method, comprising the steps of:
- inputting a signal composed of three color components;
- converting the input signal into first and second color components and a component indicating brightness;
- referring to a look-up table on a basis of the first and second color components and the component indicating brightness, and reading six pieces of output device dependent color-component data;
- and
- performing interpolation processing on a basis of the read six pieces of output device dependent color-component data, and generating output device dependent color-component data corresponding to the input signal.
An image processing method, comprising the steps of:
- inputting a signal composed of three color components;
- generating a brightness component, and two color components on a basis of minimum data of the three components;
- referring to a look-up table on a basis of the first and second color components and the component indicating brightness, and reading six pieces of output device dependent color-component data;
- and
- performing interpolation processing on a basis of the read six pieces of output device dependent color-component data, and generating output device dependent color-component data corresponding to the input signal;
- wherein:
- a structure of data stored in the look-up table is in a form of a hexagonal pyramid.
An image processing apparatus comprising:
- means for inputting a signal composed of three color components;
- means for converting the input signal into first and second color components and a component indicating brightness;
- means for referring to a look-up table on a basis of the first and second color components and the component indicating brightness, and reading six pieces of output device dependent color-component data;
- and
- means for performing interpolation processing on a basis of the read six pieces of output device dependent color-component data, and generating output device dependent color-component data corresponding to the input signal.
An image processing apparatus comprising:
- means for inputting a signal composed of three color components;
- means for generating a brightness component, and two color components on a basis of minimum data of the three components;
- means for referring to a look-up table on a basis of the first and second color components and the component indicating brightness, and reading six pieces of output device dependent color-component data;
- and
- means for performing interpolation processing on a basis of the read six pieces of output device dependent color-component data, and generating output device dependent color-component data corresponding to the input signal;
- wherein:
- a structure of data stored in the look-up table is in a form of hexagonal pyramid.
A computer-readable recording medium storing a computer readable program for controlling an image processing operation, which upon execution causes performance of the steps of:
- inputting a signal composed of three color components;
- converting the input signal into first and second color components and a component indicating brightness;
- referring to a look-up table on a basis of the first and second color components and the component indicating brightness, and reading six pieces of output device dependent color-component data;
- and
- performing interpolation processing on a basis of the read six pieces of output device dependent color-component data, and generating output device dependent color-component data corresponding to the input signal.
A computer-readable recording medium storing a program for controlling an image processing operation, which upon execution causes performance of the steps of:
- inputting a signal composed of three color components;
- generating a brightness component, and two color components on a basis of minimum data of the three components;
- referring to a look-up table on a basis of the first and second color components and the component indicating brightness, and reading six pieces of output device dependent color-component data;
- and
- performing interpolation processing on a basis of the read six pieces of output device dependent color-component data, and generating output device dependent color-component data corresponding to the input signal;
- wherein
- a structure of data stored in the look-up table is in a form of a hexagonal pyramid.
Dependencies are inferred from the claim text.