Back to results
US 2002/0159623 A1Published application
Image processing apparatus, image processing method, storage medium, and program
AssigneeCanon Kabushiki Kaisha
InventorHiroyuki Shinbata
Life of this patent
Estimating the term…
Abstract
There are provided an image processing apparatus and method. In this apparatus and method, high-frequency components are converted by multiple-frequency transformation in accordance with tone conversion used to change the dynamic range, thereby obtaining a high-quality image. For example, an original image undergoes tone conversion on the basis of a tone conversion curve, and the converted image then undergoes discrete wavelet transformation. After that, subbands obtained by discrete wavelet transformation undergo a conversion process in correspondence with the slope of the tone conversion curve.
Claims42
An image processing apparatus characterized by comprising:
- tone conversion means for executing tone conversion of an image;
- and
- component conversion means for converting frequency components of a plurality of frequency bands of the image or an image after that image has undergone tone conversion by said tone conversion means, on the basis of tone conversion characteristics of said tone conversion means.
An image processing apparatus characterized by comprising:
- tone conversion means for executing tone conversion of an image;
- frequency transformation means for decomposing an image that has undergone tone conversion by said tone conversion means into frequency components of a plurality of frequency bands;
- and
- component conversion means for converting the frequency components of the plurality of frequency bands obtained by said frequency transformation means, on the basis of tone conversion characteristics of said tone conversion means.
1 more element
An image processing apparatus characterized by comprising:
- first frequency transformation means for decomposing an image into first frequency components of a plurality of frequency bands;
- tone conversion means for executing tone conversion of the image;
- second frequency transformation means for decomposing the image that has undergone tone conversion by said tone conversion means into second frequency components of a plurality of frequency bands;
- and
- component conversion means for converting the second frequency components of the plurality of frequency bands by adding frequency components, which are obtained by converting the first frequency components of the plurality of frequency bands on the basis of tone conversion characteristics of said tone conversion means, to the second frequency components of the plurality of frequency bands.
2 more elements
An image processing apparatus characterized by comprising:
- tone conversion means for executing tone conversion of an image;
- frequency transformation means for decomposing the image into frequency components of a plurality of frequency bands;
- component conversion means for converting the frequency components of a plurality of frequency bands obtained by said frequency transformation means, on the basis of tone conversion characteristics of said tone conversion means;
- inverse frequency transformation means for generating an image by compositing the frequency components converted by said component conversion means;
- and
- addition means for adding the image generated by said inverse frequency transformation means and the image that has undergone tone conversion by said tone conversion means.
3 more elements
An image processing apparatus characterized by comprising:
- frequency transformation means for decomposing an image into frequency components of a plurality of frequency bands;
- component conversion means for converting the frequency components of the plurality of frequency bands obtained by said frequency transformation means, on the basis of predetermined tone conversion characteristics;
- inverse frequency transformation means for generating an image by compositing the frequency components converted by said component conversion means;
- and
- tone conversion means for executing tone conversion of the image generated by said inverse frequency transformation means, on the basis of the predetermined tone conversion characteristics.
2 more elements
An image processing method characterized by comprising:
- a tone conversion step of executing tone conversion of an image;
- and
- a component conversion step of converting frequency components of a plurality of frequency bands of the image or an image after that image has undergone tone conversion in the tone conversion step, on the basis of tone conversion characteristics of the tone conversion step.
An image processing method characterized by comprising:
- a tone conversion step of executing tone conversion of an image;
- a frequency transformation step of decomposing the image that has undergone tone conversion in the tone conversion step into frequency components of a plurality of frequency bands;
- and
- a component conversion step of converting the frequency components of the plurality of frequency bands obtained in the frequency transformation step, on the basis of tone conversion characteristics of the tone conversion step.
1 more element
An image processing method characterized by comprising:
- a first frequency transformation step of decomposing an image into first frequency components of a plurality of frequency bands;
- a tone conversion step of executing tone conversion of the image;
- a second frequency transformation step of decomposing the image that has undergone tone conversion in the tone conversion step into second frequency components of a plurality of frequency bands;
- and
- a component conversion step of converting the second frequency components of the plurality of frequency bands by adding frequency components, which are obtained by converting the first frequency components of the plurality of frequency bands on the basis of tone conversion characteristics of the tone conversion step, to the second frequency components of the plurality of frequency bands.
2 more elements
An image processing method characterized by comprising:
- a tone conversion step of executing tone conversion of an image;
- a frequency transformation step of decomposing the image into frequency components of a plurality of frequency bands;
- a component conversion step of converting frequency components of the plurality of frequency bands obtained in the frequency transformation step, on the basis of tone conversion characteristics of the tone conversion step;
- an inverse frequency transformation step of generating an image by compositing the frequency components converted in the component conversion step;
- and
- an addition step of adding the image generated in the inverse frequency transformation step and the image that has undergone tone conversion in the tone conversion step.
3 more elements
An image processing method characterized by comprising:
- a frequency transformation step of decomposing an image into frequency components of a plurality of frequency bands;
- a component conversion step of converting the frequency components of the plurality of frequency bands obtained in the frequency transformation step, on the basis of predetermined tone conversion characteristics;
- an inverse frequency transformation step of generating an image by compositing the frequency components converted in the component conversion step;
- and
- a tone conversion step of executing tone conversion of the image generated in the inverse frequency transformation step, on the basis of the predetermined tone conversion characteristics.
2 more elements
Dependencies are inferred from the claim text.