Method and apparatus for image processing for performing a color conversion

An image processing apparatus, comprising:

• converting means for performing a frequency conversion operation on a color image signal, said color image signal including a first brightness signal and at least one color signal, and for dividing values of said first brightness signal into a first plurality of high frequency coefficients and at least one low frequency coefficient, and for dividing values of said at least one color signal into a second plurality of high frequency coefficients and at least one low frequency coefficient;
• calculating means
• for calculating said first plurality of high frequency coefficients and said second plurality of high frequency coefficients,
• for generating a third plurality of high frequency coefficients using said first plurality of high frequency coefficients and said second plurality of high frequency coefficients, and
• for generating a second brightness signal by combining said at least one low frequency coefficient of said first brightness signal with said third plurality of high frequency coefficients;
• and
• reverse converting means for performing a reverse frequency conversion operation on said second brightness signal.

A method for image processing, comprising:

• performing a frequency conversion operation on a color image signal, said color image signal including a first brightness signal and at least one color signal;
• dividing values of said first brightness signal into a first plurality of high frequency coefficients and at least one low frequency coefficient;
• dividing values of said at least one color signal into a second plurality of high frequency coefficients and at least one low frequency coefficient;
• calculating said first plurality of high frequency coefficients and said second plurality of high frequency coefficients;
• generating a third plurality of high frequency coefficients using said first plurality of high frequency coefficients and said second plurality of high frequency coefficients;
• generating a second brightness signal by combining said at least one low frequency coefficient of said first brightness signal with said third plurality of high frequency coefficients;
• and
• performing a reverse frequency conversion operation on said second brightness signal.