Image processing apparatus and image processing method
First Claim
1. An image processing apparatus in which a color correction table containing a correspondence relationship between an input color signal and an output color signal in a table form is utilized in a conversion operation between color signals, comprising:
- a color correction table holding unit for storing thereinto a predetermined discrete input color signal and a color correction table which contains a correspondence relationship between said predetermined discrete input color signal and an output color signal in a table form;
an approximating unit for approximating an entered input signal to said discrete input color signal of the color correction table to thereby output the approximated color signal;
an approximate error producing unit for calculating an approximate error based upon both the color signal inputted into the approximating unit and the color signal outputted from the approximating unit;
an approximate error holding unit for holding thereinto the approximate error calculated by said approximate error producing unit;
a signal correcting unit for correcting the color signal entered into said approximating unit by employing said approximate error held in said approximate holding unit; and
an output unit for outputting an output color signal which corresponds to the input color signal outputted from said approximating unit with reference to said color correction table.
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Abstract
A color correction table which contains a correspondence relationship between a discrete input color signal and an output color signal is employed. An inputted color signal is corrected by a signal correcting unit, and an approximating unit acquires a discrete input color signal approximated to the corrected input color signal. A table referring unit refers to the color correction table to output an output color signal which corresponds to the input color signal approximated by the approximating unit. An approximate error producing unit calculates an approximate error from difference between the input and output signals supplied to the approximating unit, and then stores this calculated approximate error into a data holding unit. The stored approximate error is supplied to a signal correcting unit to be used in the correction of the input signal.
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Citations
14 Claims
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1. An image processing apparatus in which a color correction table containing a correspondence relationship between an input color signal and an output color signal in a table form is utilized in a conversion operation between color signals, comprising:
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a color correction table holding unit for storing thereinto a predetermined discrete input color signal and a color correction table which contains a correspondence relationship between said predetermined discrete input color signal and an output color signal in a table form;
an approximating unit for approximating an entered input signal to said discrete input color signal of the color correction table to thereby output the approximated color signal;
an approximate error producing unit for calculating an approximate error based upon both the color signal inputted into the approximating unit and the color signal outputted from the approximating unit;
an approximate error holding unit for holding thereinto the approximate error calculated by said approximate error producing unit;
a signal correcting unit for correcting the color signal entered into said approximating unit by employing said approximate error held in said approximate holding unit; and
an output unit for outputting an output color signal which corresponds to the input color signal outputted from said approximating unit with reference to said color correction table. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 13)
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10. An image processing method comprising:
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a step for correcting an inputted color signal;
a step for using a color correction table containing a correspondence relationship between a predetermined discrete input color signal and an output color signal in a table form so as to acquire a discrete input color signal which is approximated to said corrected input color signal;
a step for calculating an approximate error based upon both said corrected input color signal and said approximated color signal; and
a step for outputting an output color signal corresponding to said approximated input color signal with reference to said color correction table;
wherein said approximate error is used so as to correct a color signal which is inputted subsequent to the first-mentioned input color signal. - View Dependent Claims (11, 12, 14)
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Specification