Image processor and image processing method that uses s-shaped gamma curve
AssigneeRicoh Company, Ltd.
InventorNoriko Miyagi
Life of this patent
Estimating the term…
Abstract
An image processor includes an automatic color determining unit that determines whether an input image signal including a plurality of color signals indicates a color image or a monochrome image, an operation panel for accepting selection of a color processing mode for applying color image processing and a monochrome processing mode for applying monochrome image processing, a filtering processor that applies image processing of at least one of the color processing and the monochrome processing, and an output controller. Even when the monochrome processing mode is accepted, the image processor applies monochrome image processing based on a determination result of the automatic color determining unit.
Claims18
An image processor, comprising:
- a determining unit that determines whether an input image signal including a plurality of color signals indicates either one of a color image and a monochrome image;
- a processing mode selecting unit that accepts a selection of a color processing mode for applying a color image processing and a monochrome processing mode for applying a monochrome image processing;
- and
- a processing unit configured to execute an image processing unit that applies an image processing of any one of a color processing and a monochrome processing to the input image signal, the image processing unit including a gamma converter that applies a gamma conversion processing to the input image signal for adjusting a grayscale, wherein,
- when the processing mode selecting unit accepts the selection of the color processing mode and the input image signal has been determined to indicate the monochrome image, the gamma converter applies a gamma conversion processing using a first S-shaped gamma curve that is concave in a highlight portion and an intermediate portion and is convex in a shadow portion, and,
- when the processing mode selecting unit accepts the selection of the monochrome processing mode and the input image signal has been determined to indicate the color image, the gamma converter applies a gamma conversion processing using a second S-shaped gamma curve that is concave in a highlight portion and is convex in an intermediate portion and a shadow portion.
An image processing method for an image processor, the image processing method comprising:
- determining whether an input image signal including a plurality of color signals indicates either one of a color image and a monochrome image;
- selecting either one of a color processing mode for applying a color image processing and a monochrome processing mode for applying a monochrome image processing;
- and
- applying an image processing of either one of a color processing and a monochrome processing to the input image signal with the image processor, the applying including applying a gamma conversion processing to the input image signal for adjusting a grayscale, wherein,
- when the selection of the color processing mode is selected in the selecting and the input image signal has been determined to indicate the monochrome image, a gamma conversion processing using a first S-shaped gamma curve that is concave in a highlight portion and an intermediate portion and is convex in a shadow portion is applied, and,
- when the monochrome processing mode is selected in the selecting and the input image signal has been determined to indicate the color image, the gamma converter applies a gamma conversion processing using a second S-shaped gamma curve that is concave in a highlight portion and is convex in an intermediate portion and a shadow portion is applied.
Dependencies are inferred from the claim text.