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US 8,139,268 B2Granted
Image processing apparatus and image processing method of generating monochrome image data from two color components
AssigneeCanon Kabushiki Kaisha
InventorMasanori Matsuzaki
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Abstract
A color document is scanned using sensors of two color components, and monochrome image data is generated by performing a color conversion process on color image data made up of two color components obtained through the scanning.
Claims9
An image processing apparatus comprising:
- a reading unit constructed to read a color document using sensors for two color components;
- and
- a generation unit constructed to generate monochrome image data by performing a color conversion process on color image data having two color components obtained from the reading unit,
- wherein the color conversion process generates the monochrome image data by processing the color image data made up of two color components using a Look-Up Table that outputs one-dimensional output data for two-dimensional input data that has been combined in accordance with a predetermined rule, and
- wherein the data of each of the two color components are compared to a threshold, and in the case where the data of the two color components are not greater than the threshold, the data of the two color components are blended using a specific ratio and the blended one-dimensional data is output from the Look-Up Table, whereas in the case where the data of either of the two color components is greater than the threshold, the data of the two color components are compared to each other, the ratio of the lower data is increased, blending is performed, and the blended one-dimensional data is output from the Look-Up Table.
2 more elements
An image processing apparatus comprising:
- a reading unit constructed to read a color document using sensors for two color components;
- and
- a generation unit constructed to generate monochrome image data by performing a color conversion process on color image data having two color components obtained from the reading unit,
- wherein the color conversion process compares the data of each of the two color components to a threshold, and in the case where the data of the two color components are not greater than the threshold, the data of the two color components are blended using a predetermined conversion ratio, and the monochrome image data is generated, whereas in the case where either of the data of the two color components is greater than the threshold, the values of the data of the two color components are compared to each other, the data of the two color components are blended using a conversion ratio in which the ratio of the color component with the lower data value is increased, and the monochrome image data is generated.
1 more element
An image processing apparatus comprising:
- a reading unit constructed to read a color document using sensors for two color components;
- and
- a generation unit constructed to generate monochrome image data by performing a color conversion process on color image data having two color components obtained from the reading unit,
- wherein the color conversion process generates the monochrome image data by processing the color image data made up of two color components using a Look-Up Table that outputs one-dimensional output data for two-dimensional input data that has been combined in accordance with a predetermined rule, and
- wherein the color conversion process generates the monochrome image data based on the data of a single color component in the case where the data of the two color components are not greater than a set threshold, and generates the monochrome image data using a Look-Up Table in which the initial values of the Look-Up Table have been changed based on the threshold in the case where either of the two color components is greater than the threshold.
2 more elements
An image processing apparatus comprising:
- a reading unit constructed to read a color document using sensors for two color components;
- and
- a generation unit constructed to generate monochrome image data by performing a color conversion process on color image data having two color components obtained from the reading unit,
- wherein the color conversion process generates the monochrome image data by processing the color image data made up of two color components using a Look-Up Table that outputs one-dimensional output data for two-dimensional input data that has been combined in accordance with a predetermined rule, and
- wherein a plurality of Look-Up Tables, corresponding to a combination of two color components from among three or more color components, are generated in advance;
- and
- the color conversion process generates the monochrome image data by performing a color conversion process on the color image data using Look-Up Tables that correspond to two color components specified by a user.
4 more elements
An image processing method comprising:
- reading a color document using sensors for two color components;
- and
- generating monochrome image data by performing a color conversion process on color image data having two color components obtained in the reading step,
- wherein the color conversion process generates the monochrome image data by processing the color image data made up of two color components using a Look-Up Table that outputs one-dimensional output data for two-dimensional input data that has been combined in accordance with a predetermined rule, and
- wherein the data of each of the two color components are compared to a threshold, and in the case where the data of the two color components are not greater than the threshold, the data of the two color components are blended using a specific ratio and the blended one-dimensional data is output from the Look-Up Table, whereas in the case where the data of either of the two color components is greater than the threshold, the data of the two color components are compared to each other, the ratio of the lower data is increased, blending is performed, and the blended one-dimensional data is output from the Look-Up Table.
2 more elements
An image processing method comprising:
- reading a color document using sensors for two color components;
- and
- generating monochrome image data by performing a color conversion process on color image data having two color components obtained in the reading step,
- wherein the color conversion process compares the data of each of the two color components to a threshold, and in the case where the data of the two color components are not greater than the threshold, the data of the two color components are blended using a predetermined conversion ratio, and the monochrome image data is generated, whereas in the case where either of the data of the two color components is greater than the threshold, the values of the data of the two color components are compared to each other, the data of the two color components are blended using a conversion ratio in which the ratio of the color component with the lower data value is increased, and the monochrome image data is generated.
1 more element
Dependencies are inferred from the claim text.