Method and apparatus for processing an image
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshimitsu Kanno, Teruo Fumoto, Hiroaki Kotera
Life of this patent
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Abstract
In a method and an apparatus for processing an image, a small screen dot pattern is prepared. A large screen dot pattern is generated by copying or repeatedly reading out the small screen dot pattern. Data of a variable tone image are processed with the large screen dot pattern and are thereby converted into processed image data representative of a screen dot image. The screen dot image may be recorded in a suitable way.
Claims9
In a method for changing a size of an image wherein new data are added between original picture element data through an interpolation process to change the size of the original image by a factor of B/.alpha. where the characters B and .alpha. denote integers, the improvement comprising a method of processing the image, including the steps of:
- (a) equally dividing an interval between adjacent picture elements of an original image into G image portions, wherein G is an integer;
- (b) setting points corresponding to the respective divided image interval portions;
- (c) determining interpolation data at points which vary as a function of adjacent picture elements of the original image;
- (d) selecting part of the interpolation data at a rate equal to B/(.alpha..multidot.G), and
- (e) deriving output data h through said interpolation process in accordance with the following equation:
- h=gn+((gn+1-gn)/G).multidot.i
- where i denotes a number for selection of the points, which number i is determined in accordance with a rate equal to B/(.alpha..multidot.G).
In an image processing apparatus including size changing means for changing a size of an image wherein new data are added between original picture element data, said size changing means including interpolating means for changing the size of the original image by a factor of B/.alpha. where the characters B and .alpha. denote integers,
- the improvement wherein said interpolating means determines interpolation data at points which vary as a function of adjacent picture elements of the original image;
- said image processing apparatus comprises processing means, said processing means including:
- (a) dividing means for equally dividing an interval between adjacent picture elements of an original image into G image portions, wherein G is an integer;
- and
- (b) setting means for setting points corresponding to the respective divided image portions;
- and further including selecting means for selecting part of the interpolation data at a rate equal to B/(.alpha..multidot.G),
- said interpolating means further including deriving means for deriving output data h in accordance with the following equation:
- h=gn+((gn+1-gn)/G).multidot.i
- where i denotes a number for selection of the points which is determined in accordance with a rate equal to B/(.alpha..multidot.G).
Dependencies are inferred from the claim text.