Image processing method and apparatus
AssigneeCanon Kabushiki Kaisha
InventorTakahiro Oshino
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Abstract
An image processing system generates un-sharp signals from input image data representing an input image. The system includes a reducing device which reduces the input image, and a blurring device which performs blurring processing on the reduced image. The system also includes an enlarging device which performs enlarging processing on the blurring processed image and outputs the un-sharp signals, and an image processing device performs image processing on the input image based on the un-sharp signals.
Claims18
An image processing apparatus for generating un-sharp signals from input image data representing an input image, comprising:
- setting means for setting an amount of blur;
- reduction ratio determining means for determining a reduction ratio for reducing an input image based on the amount of blur, wherein the reduction ratio is an integer which is not greater than the amount of blur, and by which the amount of blur is divisible;
- amount of blur determining means for determining an amount of blur to be applied to a reduced input image based on the amount of blur set by said setting means and the reduction ratio;
- reducing means for reducing the input image based on the reduction ratio in order to produce a reduced input image;
- blurring means for performing blurring processing to the reduced input image, using the amount of blur determined by said amount of blur determining means;
- enlarging means for performing enlarging processing to the reduced input image having been processed in said blurring processing and outputting the un-sharp signals, wherein the un-sharp signals have a pixel density or a number of pixels which is equal to that of the input image;
- and
- image processing means for performing image processing to the input image using the un-sharp signals.
An image processing method of generating un-sharp signals from input image data representing an input image, comprising:
- a setting step of setting an amount of blur;
- a reduction ratio determining step of determining a reduction ratio for reducing an input image based on the amount of blur, wherein the reduction ratio is an integer which is not greater than the amount of blur, and by which the amount of blur is divisible;
- an amount of blur determining step of determining an amount of blur to be applied to a reduced input image based on the amount of blur set by said setting step and the reduction ratio;
- a reducing step of reducing the input image based on the reduction ratio in order to produce a reduced input image;
- a blurring step of performing blurring processing to the reduced input image, using the amount of blur determined by said amount of blur determining step;
- an enlarging step of performing enlarging processing to the reduced input image having been processed in said blurring processing and outputting the un-sharp signals, wherein the un-sharp signals have a pixel density or a number of pixels which is equal to that of the input image;
- an image processing step of performing image processing to the input image using the un-sharp signals.
Dependencies are inferred from the claim text.