US 7,403,207 B1Granted

Intensity weighting for sub-pixel positioning

AssigneeRockwell Collins, Inc.

InventorsMark G. Vancleef, Richard S. Arlint

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Abstract

A method for determining intensity of a sub-pixel position within a pixelated image to enhance the image quality thereof. In a first step of this method information is received regarding a first pixel at a position X0,Y0, having an intensity I(X0,Y0). In a second step information is received regarding a second pixel at a position X1,Y0, where said second pixel is adjacent to and to the right of said first pixel. In third step, information is received regarding a third pixel at a position X0,Y1, where the third pixel is adjacent to and below the first pixel. In a fourth step information is received regarding a fourth pixel at a position X1,Y1, where the fourth pixel is adjacent to and to the right of the third pixel. A pixel value, I(X,Y), is then calculated where I(X,Y)=(((Nx−(Nx*(X−X0)))*(Ny−(Ny*(Y−Y0)))*I(X0,Y0))+((Nx−(Nx*(X1−X)))*(Ny−(Ny*(Y−Y0)))*I(X1,Y0))+((Nx−(Nx*(X−X0)))*(Ny−(Ny*(Y1−Y)))*I(X0,Y1))+((Nx−(Nx*(X−X)))*(Ny−(Ny*(Y1−Y)))*I(X1,Y1)))/(Ny*Nx), wherein the digital granularity is Nx per lateral pixel, Ny per vertical pixel and wherein X,Y is a sub-pixel position provided from an upper level system.

Claims7

Dependent claims

A method for enhancing the quality of an image on a combiner of a Head Up Display (HUD) which has been distorted by optical aberrations of the optical components of the HUD, comprising the steps of:

a) determining intensity of a sub-pixel position within a pixelated source image that is desired to be reproduced on a combiner by gathering data from said pixelated source image, said step of gathering data, comprising the substeps of:
i. receiving information from said pixelated source image regarding a first pixel at a position X0,Y0, having an intensity I(X0,Y0);
ii. receiving information from said pixelated source image regarding a second pixel at a position X1,Y0, where said second pixel is adjacent to and to the right of said first pixel;
iii. receiving information from said pixelated source image regarding a third pixel at a position X0,Y1, where said third pixel is adjacent to and below said first pixel;
iv. receiving information from said pixelated source image regarding a fourth pixel at a position X1,Y1, where said fourth pixel is adjacent to and to the right of said third pixel;
and,
v. calculating a pixel value, I(X,Y), where I(X,Y)=(((Nx−(Nx*(X−X0)))*(Ny−(Ny*(Y−Y0)))*I(X0,Y0))+((Nx−(Nx*(X1−X)))*(Ny−(Ny*(Y−Y0)))*I(X1,Y0))+((Nx−(Nx*(X−X0)))*(Ny−(Ny*(Y1−Y)))*I(X0,Y1))+((Nx−(Nx*(X1−X)))*(Ny−(Ny*(Y1−Y)))*I(X1,Y1)))/(Ny*Nx), wherein the digital granularity is Nx per lateral pixel, Ny per vertical pixel and wherein X,Y is a subpixel position provided from said pixelated source image;
and,
b) utilizing said I(X,Y) to set the intensity of a pixel in a predistorted image to provide an enhanced image, wherein latency is minimized.

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Dependencies are inferred from the claim text.