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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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4.0 | 1 rating Rate this file 56 Downloads (last 30 days) File Size: 372.93 KB File ID: #23142

Iterative Pyramidal LK Optical Flow

27 Feb 2009 (Updated 27 Mar 2009)

An implementation of Lucas-Kanade optical flow computation.

File Information
Description	Using pyramid decomposition and iterative refinement, OF is calculated. Includes a demo and a paper that thoroughly explains the methodology.
Required Products	Image Processing Toolbox
MATLAB release	MATLAB 7.6 (R2008a)

Tags for This File
Everyone's Tags	computer vision, image processing(2), lucaskanade(2), optical flow(2)
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Comments and Ratings (5)
27 Feb 2009	Am VR	Hi Berkin, Thanks for sharing this. Could you please also upload the images yos9.tif and yos10.tif referenced in the demo.m file? Thanks! Best,AV
01 Mar 2009	Berkin Bilgic	Hi, I added two example images and some more comments, I hope they'll be online soon. Berkin
11 Apr 2009	Gabriel Kasser	Hi I am a french student and I tried make your algorythm work with python but I have a problem (I don't know if it is me or the pdf). when I compute the G matrix , this one is always uninvertible (I dont see how it would be possible to invert a Matrix [[Ix²,IxIy],[IXIy,Iy²]] because the determinant is always 0) could you help me please? Best regards GK
14 Apr 2009	Berkin Bilgic	Hi, The terms Ix^2 and Iy^2 denote the second derivatives wrt to x and y. However, that matrix is sometimes ill conditioned, so you may want to google 'good features to track' by Shi&Tomosi which discusses that problem.
28 Apr 2009	Assaf laufer	Hi all the SAD before / SAD after is always at 1.6 ~ 1.9 for my pictures Has anyone got beeter SAD ratio?

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Updates
27 Feb 2009	Example images and a few more comments are added
27 Mar 2009	Borders are handled better, and refinement is updated.