Iterative Pyramidal LK Optical Flow: pyramidInit( A, B_in, PYRE_NO, winSize ) - File Exchange

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Highlights from
Iterative Pyramidal LK Optical Flow

Hmatrix( Ix, Iy, SizeBig, alf... At each pyramid level, this function generates the Hessian matrix for the
LKstep( It, Ix, Iy, H, SizeB... This function calculates one iteration of optical flow
imInit( str )
imReflect( I, bordSize ) bordSize : number of reflected pixels from each side of the image
imS( Iin, figNo, varargin )
imWarp( flowHor, flowVer, Bin... This function warps B towards A
pyramidFlow( A, B_in, winSize... This function find the optical flow from A to B using pyramid
pyramidInit( A, B_in, PYRE_NO... This function forms image pyramids and initializes other variables
pyramidInitialize( A, B_in, P... This function forms image pyramids and initializes other variables
sizeCheck( A, B_in, PYRE_NO ) If image sizes are not integer multiples of maximum downsampling ratio,
demo.m
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from Iterative Pyramidal LK Optical Flow by Berkin Bilgic
An implementation of Lucas-Kanade optical flow computation.

pyramidInit( A, B_in, PYRE_NO, winSize )

function [ Apyre, Bpyre, halfWindow ] = pyramidInit( A, B_in, PYRE_NO, winSize )

%This function forms image pyramids and initializes other variables

halfWindow = (winSize-1)/2;
G = fspecial('gaussian',[3 3],1);

Apyre{1} = conv2( A, G, 'same' );
Bpyre{1} = conv2( B_in, G, 'same' );

if PYRE_NO > 1
    for k = 2:PYRE_NO
        Apyre{k} = impyramid( Apyre{k-1}, 'reduce' );
        Bpyre{k} = impyramid( Bpyre{k-1}, 'reduce' );
    end
end

end

Highlights from Iterative Pyramidal LK Optical Flow

Highlights from
Iterative Pyramidal LK Optical Flow