Image processing method and apparatus for suppressing positional shift image degradation
First Claim
1. An image processing method comprising:
- using an image processing apparatus to perform the following steps;
a first acquisition step of acquiring, by using an image input unit, first image data of an inputted image at a first resolution;
a storage step of extracting first low-frequency components of luminance values from the first image data, and storing the extracted first low-frequency components in a memory;
a second acquisition step of acquiring second image data of each of divided areas into which the inputted image is divided, said second image data being acquired at a second resolution higher than the first resolution;
a low-frequency extraction step of extracting a second low-frequency components of luminance values from the second image data;
an image processing step of performing image processing for the second image data, using both the extracted second low-frequency components and low-frequency components of an area corresponding to the divided area in the inputted image among the first low-frequency components stored in the memory,wherein the second acquisition step, the low-frequency extraction step, and the image processing step are performed in sequence for each of the divided areas.
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Abstract
There are provided an image processing method and apparatus which can reduce the storage capacity required to form low-frequency components having a plurality of resolutions and can suppress any degradation in image quality which is caused by a positional error between image data obtained as a result of image processing. The first luminance component of low resolution is extracted from image data, thereby further extracting the first low-frequency component. The image data is input at the second resolution, the second luminance component is extracted from the image data at the second resolution, and the second low-frequency component is extracted, thereby further extracting the second low-frequency component. Image processing is performed for the image data at the second resolution using the first low-frequency component and second low-frequency component.
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Citations
8 Claims
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1. An image processing method comprising:
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using an image processing apparatus to perform the following steps; a first acquisition step of acquiring, by using an image input unit, first image data of an inputted image at a first resolution; a storage step of extracting first low-frequency components of luminance values from the first image data, and storing the extracted first low-frequency components in a memory; a second acquisition step of acquiring second image data of each of divided areas into which the inputted image is divided, said second image data being acquired at a second resolution higher than the first resolution; a low-frequency extraction step of extracting a second low-frequency components of luminance values from the second image data; an image processing step of performing image processing for the second image data, using both the extracted second low-frequency components and low-frequency components of an area corresponding to the divided area in the inputted image among the first low-frequency components stored in the memory, wherein the second acquisition step, the low-frequency extraction step, and the image processing step are performed in sequence for each of the divided areas. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image processing apparatus comprising:
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a first acquisition unit configured to acquire first image data of an inputted image at a first resolution; a storage unit to extract first low-frequency components of luminance values from the first image data, and to store the extracted first low-frequency components in a memory; a second acquisition unit configured to acquire second image data of each of divided areas into which the inputted image is divided, said second image data being acquired at a second resolution higher than the first resolution; a low-frequency extraction unit to extract second low-frequency components of luminance values from the second image data; an image processing unit to perform image processing for the second image data, using both the extracted second low-frequency components and low-frequency components of an area corresponding to the divided area in the inputted image among the first low-frequency components stored in the memory, wherein the functions performed by the second acquisition unit, the low-frequency extraction unit, and the image processing unit are performed in sequence for each of the divided areas.
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8. A program stored on a computer-readable medium for causing a computer to execute a processing method comprising:
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a first acquisition procedure of acquiring first image data image of an inputted image at a first resolution; a storage procedure of extracting first low-frequency components of luminance values from the first image data, and storing the extracted first low-frequency components in a memory; a second acquisition procedure of acquiring second image data of each of divided areas into which the inputted image is divided, said second image data being acquired at a second resolution higher than the first resolution; a low-frequency extraction procedure of extracting second low-frequency components of luminance values from the second image data; an image processing procedure configured to perform image processing for the second image data, using both the extracted second low-frequency components and low-frequency components of an area corresponding to the divided area in the inputted image among the stored first low-frequency components stored in the memory, wherein the second acquisition procedure, the low-frequency extraction procedures and the image processing procedure are performed in sequence for each of the divided areas.
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Specification