Image processing method, image processing apparatus and recording medium
AssigneeRicoh Company, Ltd.
InventorHisao Shirasawa
Life of this patent
Estimating the term…
Abstract
When performing predetermined color correction/modification processing on RGB image data including red, green and blue color components so as to perform hue correction thereon, a frequency distribution of respective tone values is obtained for at least one of these red, green and blue color components of the RGB image data; it is determined from the frequency distribution whether or not the RGB image data has already undergone tone transformation; and the predetermined color correction/modification processing is performed on the RGB image data so as to perform the hue correction thereon only when it is determined that the RGB image data has not undergone tone transformation yet.
Claims45
An image processing apparatus carrying out tone correction on input image data including a plurality of color components, comprising:
- a frequency distribution calculating part calculating a frequency distribution of tone values for at least one of the plurality of color components;
- a determining part determining, based on the frequency distribution calculated by said frequency distribution calculating part, whether or not tone transformation has been carried out;
- a tone correcting part carrying out tone correction processing on the input image data;
- and
- a switching part switching, according to a determination result of said determining part, as to whether the input image data or image data having undergone the tone correction processing is output.
An image processing apparatus carrying out tone correction on input image data including a plurality of color components, comprising:
- a frequency distribution calculating part calculating a frequency distribution of tone values for at least one of the plurality of color components;
- a determining part determining, based on the frequency distribution calculated by said frequency distribution calculating part, whether or not tone transformation has been carried out;
- a tone correcting part carrying out tone correction processing on the input image data;
- and a switching part carrying out switching operation in such a manner that, when said determining part determines that tone transformation has been carried out, the input image data is output, while, when said determining part determines that tone transformation has not been carried out, image data having undergone the tone correction processing is output.
An image processing method for carrying out tone correction on input image data including a plurality of color components, comprising:
- a frequency distribution calculating step calculating a frequency distribution of tone values for at least one of the plurality of color components;
- a determining step determining, based on the frequency distribution calculated in said frequency distribution calculating step, whether or not tone transformation has been carried out;
- a tone correcting step carrying out tone correction processing on the input image data;
- and
- a switching step switching, according to a determination result of said determining step, as to whether the input image data or image data having undergone the tone correction processing is output.
An image processing method for carrying out tone correction on input image data including a plurality of color components, comprising:
- a frequency distribution calculating step calculating a frequency distribution of tone values for at least one of the plurality of color components;
- a determining step determining, based on the frequency distribution calculated in said frequency distribution calculating step, whether or not tone transformation has been carried out;
- a tone correcting step carrying out tone correction processing on the input image data;
- and
- a switching step carrying out switching operation in such a manner that, when it is determined in said determining step that tone transformation has been carried out, the input image data is output, while, when it is determined in said determining step that tone transformation has not been carried out, image data having undergone the tone correction processing is output.
A computer readable recording medium storing a program for causing a computer to carry out tone correction on input image data including a plurality of color components, said program comprises instructions for causing the computer to execute:
- a frequency distribution calculating step calculating a frequency distribution of tone values for at least one of the plurality of color components;
- a determining step determining, based on the frequency distribution calculated in said frequency distribution calculating step, whether or not tone transformation has been carried out;
- a tone correcting step carrying out tone correction processing on the input image data;
- and
- a switching step switching, according to a determination result of said determining step, as to whether the input image data or image data having undergone the tone correction processing is output.
A computer readable recording medium storing a program for causing a computer to carry out tone correction on input image data including a plurality of color components, said program comprises instructions for causing the computer to execute:
- a frequency distribution calculating step calculating a frequency distribution of tone values for at least one of the plurality of color components;
- a determining step determining, based on the frequency distribution calculated in said frequency distribution calculating step, whether or not tone transformation has been carried out;
- a tone correcting step carrying out tone correction processing on the input image data;
- and
- a switching step carrying out switching operation in such a manner that, when it is determined in said determining step that tone transformation has been carried out, the input image data is output, while, when it is determined in said determining step that tone transformation has not been carried out, image data having undergone the tone correction processing is output.
Dependencies are inferred from the claim text.