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--
-- File: Image_PixelInterpolation.cdl
-- Created: Tue Jul 27 18:47:06 1993
-- Author: Jean Louis FRENKEL
-- <jlf@sparc3>
---Copyright: Matra Datavision 1993
class PixelInterpolation from Image
---Purpose: The class PixelInterpolation is used to compute a Pixel
-- value on non-integer Image coordinate. This Pixel type
-- is called SubPixel .
-- PixelInterpolation is the default and is the simplest one,
-- SubPixel value on non-integer Image coordinate is the
-- value of the nearest Pixel at integer coordinate.
-- The user can create a new kind of PixelInterpolation with a
-- new algorithm by creating a new derived PixelInterpolation
-- class and redefined Interpolate() method.
-- If V1 is the value of the nearest Image Pixel
-- V = V1 is the Image SubPixel value on non-integer
-- coordinate (FX,FY)
uses
Pixel from Aspect,
Image from Image,
ColorPixel from Aspect,
IndexPixel from Aspect,
DColorImage from Image,
DIndexedImage from Image
is
Create returns PixelInterpolation from Image ;
---Level: Public
---Purpose: Create a PixelInterpolation object.
Interpolate( me ; aImage : Image from Image ;
X,Y : Real from Standard ;
LowerX,LowerY,UpperX,UpperY : Integer from Standard ;
RetPixel : in out Pixel from Aspect )
returns Boolean from Standard
is virtual ;
---Level: Public
---Purpose: Compute SubPixel's value on non-integer Image coordinate.
-- LowerX,LowerY,UpperX,UpperY is the Image Min Max, it's used
-- to check if the SubPixel coordinate X,Y is outside of image.
-- Return True if Interpolation Succes.
-- Retrun False if the SubPixel is out from Image.
Interpolate( me ; aImage : DColorImage from Image ;
FX,FY : Real from Standard ;
LowerX,LowerY,UpperX,UpperY : Integer from Standard ;
RetPixel : in out ColorPixel from Aspect )
returns Boolean from Standard
is virtual ;
---Level: Public
---Purpose: Compute SubPixel's value on non-integer Image coordinate for
-- DColorImage and ColorPixel.
-- LowerX,LowerY,UpperX,UpperY is the Image Min Max, it's used
-- to check if the SubPixel coordinate FX,FY is outside of
-- image.
-- Return True if Interpolation Succes.
-- Return False if the SubPixel is out from Image.
Interpolate( me ; aImage : DIndexedImage from Image ;
FX,FY : Real from Standard ;
LowerX,LowerY,UpperX,UpperY : Integer from Standard ;
RetPixel : in out IndexPixel from Aspect )
returns Boolean from Standard
is virtual ;
---Level: Public
---Purpose: Compute SubPixel's value on non-integer Image coordinate for
-- DIndexedImage and IndexPixel.
-- LowerX,LowerY,UpperX,UpperY is the Image Min Max, it's use
-- check if the SubPixel coordinate X,Y is outside of image.
-- Return True if Interpolation Succes.
-- Return False if the SubPixel is out from Image.
DoInterpolate( me ; aImage : Image from Image ;
X,Y : Real from Standard ;
LowerX,LowerY,UpperX,UpperY: Integer from Standard ;
RetPixel : in out Pixel from Aspect )
returns Boolean from Standard is static private ;
end PixelInterpolation from Image;
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