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-- File: Image_BalancedPixelInterpolation.cdl
-- Created: Tue Jul 27 18:47:06 1993
-- Author: Jean Louis FRENKEL
-- <jlf@sparc3>
---Copyright: Matra Datavision 1993
class BalancedPixelInterpolation from Image inherits PixelInterpolation from Image
---Purpose: The class BalancedPixelInterpolation is used to compute a
-- SubPixel value on non integer Image coordinate
-- BalancedPixelInterpolation redefined a new method to compute
-- a SubPixel value .
-- The value is the proportional to the distance of the
-- four nearest Image Pixel.
-- A B
-- SubPixel
-- C D
-- If VA, VB, VC, VD is the value of the four nearest Image
-- Pixel, if ColDelta and RowDelta is the distance from non
-- integer coordinate (FX,FY) to the upper left nearest Image
-- Pixel , then :
-- ColDelta = FX - XA ;
-- RowDelta = FY - YA ;
-- CAB = ColDelta*( VB - VA ) + VA
-- CCD = ColDelta*( VD - VC ) + VD
-- V = RowDelta*( CCD - CAB ) + CAB
-- is the Image SubPixel value on non integer
-- coordinate (FX,FY).
uses
Image from Image,
Pixel from Aspect,
ColorPixel from Aspect,
IndexPixel from Aspect,
DColorImage from Image,
DIndexedImage from Image
is
Create returns BalancedPixelInterpolation from Image ;
---Level: Public
---Purpose: Create a BalancedPixelInterpolation object.
Interpolate( me ; aImage : Image from Image ;
FX,FY : Real from Standard ;
LowerX,LowerY,UpperX,UpperY : Integer from Standard ;
RetPixel : in out Pixel from Aspect )
returns Boolean from Standard is redefined ;
---Level: Public
---Purpose: Redefined the method to 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 FX,FY is outside of
-- image.
-- Return True if Interpolation Succes.
-- Return 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 redefined;
---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 redefined;
---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 used
-- to 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.
end BalancedPixelInterpolation from Image;
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