Method of and apparatus for filtering image
AssigneeFuji Photo Film Co., Ltd.
InventorWataru Ito
Life of this patent
Estimating the term…
Abstract
In a method of image filtering for carrying out picture element interpolation on a digital image signal obtained by sampling at a predetermined density an image signal representing an original image, the number of image signal components of the digital image signal is increased by interpolating, into the digital image signal, image signal components whose values are obtained on the basis of a predetermined operation using values of all the picture elements within the area covered with a filter and the coefficient of the filter corresponding to each of the picture elements. When an edge portion exists in the area covered with the filter, the predetermined operation is carried out after the image signal components for the picture elements representing the edge portion are corrected.
Claims10
A method of image filtering for performing picture element interpolation on a digital image signal obtained by sampling, at a predetermined density, an image signal having image signal components representing an original image, said method comprising:
- identifying edge portion image signal components for picture elements representing an edge portion of said image signal;
- correcting respective values of said edge portion image signal components for said picture elements representing said edge portion to a value of a picture element adjacent to said edge portion to obtain corrected image signal components;
- processing said image signal components for picture elements arranged within said area covered by said filter and said corrected image signal components based upon coefficients of said filter corresponding to each of said image signal components and said corrected image signal components to obtain processed image signal components;
- and
- interpolating, into said digital image signal, image signal components having values obtained on the basis of said processed image signal components.
An apparatus for image filtering which performs picture element interpolation on a digital image signal obtained by sampling, at a predetermined density, an image signal having image signal components representing an original image, said apparatus comprising:
- identifying edge portion image signal components for picture elements representing an edge portion of said image signal;
- means for correcting respective values of said edge portion image signal components for said picture elements representing said edge portion to a value of a picture element adjacent to said edge portion to obtain corrected image signal components;
- means for processing said image signal components for picture elements arranged within said area covered by said filter and said corrected image signal components based upon coefficients of said filter corresponding to each of said image signal components and said corrected image signal components to obtain processed image signal components;
- and
- interpolation processing means for interpolating, into said digital image signal, image signal components having values obtained on the basis of said processed image signal components.
Dependencies are inferred from the claim text.