Image processing apparatus, and image processing method

1. An image processing apparatus for correcting a hue and a saturation in an input video signal of a moving picture in real time, comprising:

a signal separation unit configured to separate a luminance signal, and two color-difference signals from the input video signal;

an extracting unit configured to extract the hue and the saturation from the input video signal, the extracting unit including

a first calculating unit configured to calculate the hue based on a ratio of the two color-difference signals with reference to a look-up table; and

a second calculating unit configured to calculate the saturation based on the two color-difference signals;

a determining unit configured to determine a correcting amount according to the hue and the saturation extracted by said extracting unit; and

a correcting unit configured to correct the hue and the saturation of the input video signal based on the determined correcting amount of said determining unit and a luminance level of the input video signal.

2. The image processing apparatus as cited in claim 1 , wherein the determining unit is configured to set the correcting amount so as to correct the input video signal with respect to a plurality of regions having different hue to each other.

3. The image processing apparatus as cited in claim 1 , wherein

said determining unit includes a hue determining unit and a saturation determining unit; and

the correcting amount of the hue of the input video signal is determined by the hue determining unit and the correcting amount of saturation of the input video signal is determined by the saturation determining unit independently to each other.

4. An image processing apparatus for correcting a hue and a saturation in an input video signal of a moving picture in real time, comprising:

an extracting unit configured to extract a hue and a saturation from the input video signal;

a determining unit configured to determine a correcting amount according to the hue and the saturation extracted by said extracting unit and configured to set the correcting amount in an arbitrary angle range on a color-difference plane with the two color-difference signals indicated in the x axis and in the y axis; and

a correcting unit configured to correct the hue and the saturation of the input video signal based on the determined correcting amount of said determining unit and a luminance level of the input video signal.

5. An image processing method for correcting a hue and a saturation in an input video signal of a moving picture in real time, comprising using a processor to perform:

separating a luminance signal, and two color-difference signals from the input video signal;

extracting a hue and a saturation from the input video signal. the extracting including calculating the hue based on a ratio of the two color-difference signals with reference to a look-up table, and

calculating the saturation based on the two color-difference signals;

determining a correcting amount according to the hue and the saturation extracted; and

correcting the hue and the saturation of the input video signal based on the determined correcting amount and a luminance level of the input video.

6. The image processing method as cited in claim 5 , wherein the correcting amount is set to correct the input video signal with respect to a plurality of regions having different hue to each other in said determining.

7. The image processing method as cited in claim 5 , wherein

said determining includes determining the correcting amount of hue of the input video signal and the correcting amount of saturation of the input video signal independently of each other.

8. An image processing method for correcting a hue and a saturation in an input video signal of a moving picture in real time, comprising using a processor to perform:

extracting a hue and a saturation from this input video signal;

determining a correcting amount according to the hue and the saturation extracted, said correcting amount being set in an arbitrary angle range on a color-difference plane with the two color-difference signals indicated in the x axis and in the y axis; and

correcting the hue and the saturation of the input video signal based on the determined correcting amount and a luminance level of the input video.