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### Highlights from Iterative Pyramidal LK Optical Flow

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4.3 | 3 ratings Rate this file 29 Downloads (last 30 days) File Size: 373 KB File ID: #23142 Version: 1.2

# Iterative Pyramidal LK Optical Flow

### Berkin Bilgic (view profile)

27 Feb 2009 (Updated )

An implementation of Lucas-Kanade optical flow computation.

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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)
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Comments and Ratings (7)
28 Sep 2014 Bob

### Bob (view profile)

Thanks.Recently,I'm researching this.

17 May 2014 Y Simson

### Y Simson (view profile)

Nicely written code. Thanks

28 Apr 2009 Assaf laufer

### Assaf laufer (view profile)

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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14 Apr 2009 Berkin Bilgic

### Berkin Bilgic (view profile)

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.

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11 Apr 2009 Gabriel Kasser

### Gabriel Kasser (view profile)

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,Ix*Iy],[IX*Iy,Iy²]] because the determinant is always 0) could you help me please?

Best regards
GK

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01 Mar 2009 Berkin Bilgic

### Berkin Bilgic (view profile)

Hi,

I added two example images and some more comments, I hope they'll be online soon.

Berkin

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27 Feb 2009 Am VR

### Am VR (view profile)

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

Updates
27 Feb 2009 1.1

Example images and a few more comments are added

27 Mar 2009 1.2

Borders are handled better, and refinement is updated.

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