JP2010181807A5

JP2010181807A5 -

Info

Publication number: JP2010181807A5
Application number: JP2009027479A
Authority: JP
Filing date: 2009-02-09
Publication date: 2012-03-01
Anticipated expiration: 2029-02-09

Claims

An image processing apparatus for correcting an image signal,
A gradation correction unit that performs gradation correction processing on the saturation component of the image signal;
And the image signal in the predetermined saturation level range of the predetermined spatial frequency band, the saturation component correction be calculated according to the correction amount of the luminance component of the image signal, the processing content of the tone correction process A quantity calculator;
A saturation component correction unit that corrects a saturation component of the image signal after the gradation correction processing by the gradation correction unit using the correction amount calculated by the saturation component correction amount calculation unit. An image processing apparatus.

In claim 1,
The gradation correction unit
Perform gradation correction processing according to the correction curve indicating the relationship between the luminance component before correction and the luminance component after correction,
The saturation component correction amount calculation unit
An image processing apparatus that calculates the correction amount according to a slope of a correction curve in the gradation correction processing.

In claim 2,
The saturation component correction amount calculation unit
The saturation component of the image signal corresponding to a gradation with a small gradient of the correction curve is increased, and the saturation component of the image signal corresponding to a gradation with a large gradient of the correction curve is decreased. An image processing apparatus that calculates the correction amount.

In any one of Claims 1 thru | or 3,
The saturation component correction amount calculation unit,
An image processing apparatus, wherein the correction amount is calculated according to a processing content of the gradation correction processing and a visual environment.

In claim 4,
The saturation component correction amount calculation unit,
An image processing apparatus, wherein the correction amount is calculated using a luminance ratio of external light and output light of the image display unit as the visual environment.

In any one of Claims 1 thru | or 5,
A frequency analysis unit that analyzes a spatial frequency of a saturation component of the image signal;
The saturation component correction amount calculation unit,
An image processing apparatus that calculates a correction amount of a saturation component of the image signal according to at least an analysis result of the frequency analysis unit and a processing content of the gradation correction processing.

In claim 6,
The frequency analysis unit
A saturation noise removing unit that removes a given saturation noise component from the saturation component of the image signal;
The saturation component correction unit is
An image processing apparatus that corrects a saturation component of the image signal from which the saturation noise component has been removed by the saturation noise removal unit, using the correction amount.

In any one of Claims 1 thru | or 7,
A conversion circuit that converts a color difference component constituting the image signal into a saturation component and a hue component corresponding to the color difference component;
An image processing apparatus that corrects the saturation component converted by the conversion circuit.

An image display device that displays an image based on an image signal,
The image processing apparatus according to claim 1, wherein the image signal is corrected;
An image display device comprising: an image display unit that displays an image based on the image signal corrected by the image processing device.

An image display device that displays an image based on an image signal,
The image processing apparatus according to claim 4 or 5, wherein the image signal is corrected.
An image display unit for displaying an image based on the image signal corrected by the image processing device;
An image display device comprising: a sensor for measuring the luminance of the output light of the image display unit and the luminance of the external light.

An image processing method for correcting an image signal,
A gradation correction step for performing gradation correction processing on the saturation component of the image signal;
And the image signal in the predetermined saturation level range of the predetermined spatial frequency band, the saturation component correction be calculated according to the correction amount of the luminance component of the image signal, the processing content of the tone correction process A quantity calculating step;
A saturation component correction step of correcting the saturation component of the image signal after the gradation correction processing in the gradation correction step using the correction amount calculated in the saturation component correction amount calculation step. An image processing method.