1 / 39

Development of a Free Image Processing Toolbox for Scilab

Development of a Free Image Processing Toolbox for Scilab. Author: Ricardo Fabbri Advisor: Luciano da Fontoura Costa e-mail: rfabbri@if.sc.usp.br URL: siptoolbox.sourceforge.net Instituto de Ciências Matemáticas e de Computação Universidade de São Paulo, Brasil. 09/2003.

sofia
Download Presentation

Development of a Free Image Processing Toolbox for Scilab

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Development of a Free Image Processing Toolbox for Scilab Author: Ricardo Fabbri Advisor: Luciano da Fontoura Costa e-mail: rfabbri@if.sc.usp.br URL: siptoolbox.sourceforge.net Instituto de Ciências Matemáticas e de Computação Universidade de São Paulo, Brasil. 09/2003

  2. Plan of Presentation • Introduction • Design and Development • Implemented Functionalities • Future Work • The Cybernetic Vision Research Group • Conclusions • References

  3. Introduction

  4. SciLab • Free software • Numerical programming • Rapid Prototyping • Extensive libraries and toolboxes • Easy for matrix manipulation: • A * B * C + D • Unnecessary looping

  5. SciLab • Ambiente open source • Programacao numerica • Prototipacao • Rotinas prontas • Facil para manipular matrizes: • A * B * C + D • Loop desnecessario Ideal for Image Processing

  6. SIP toolbox Goals: • Image I/O for SciLab • Image processing, analysis, and recognition. • Free software • Cross-platform

  7. SIP toolbox • Beginning: only a few simple routines • By the end of 2001 • Routines for image I/O in virtually any format • Many other routines for IP • Today it is used by many researchers and students around the globe

  8. Development

  9. Software Design

  10. Auto-configuration Problems with portability • Differences between development and usage environments • UNIX has many variants and is highly customizable • How to detect external libraries? • How to deal with different versions of Scilab?

  11. GNU Autotools • Autoconf, Automake, and Libtool • Typical in free software • Enable installation through the famous sequence: • configure # tests the system • Make # compiles • Make install # installs

  12. Autotoconf and Automake

  13. My Experience with Free Development • “Release early, Release Often” • FEEDBACK • Linux/UNIX • Sourceforge.net • Requirements • Effective user inclusion

  14. Free Development • Architectural design (high level) • SIP is simple • Joint usage of routines is not enforced by the software policy • Detailed design • Interface ~ Matlab • Good sourcecode organization

  15. Free Development • Test • Interactive prototyping • Alpha and beta versions • Main developer tests less and fixes more. • Deployment • Freshmeat.net and Sourceforge.net • email and newgroups

  16. Functionalities

  17. Image I/O • Read image files • imread • Write imag files • imwrite • Almost 80 formats: JPEG, TIFF, BMP, PNG, GIF, FITS, XPM, Photo-CD, ... • ImageMagick

  18. 1D Gaussian filtering • Convolution by Fourier Transform

  19. 1D Gaussian filtering

  20. Multiscale Skeletons

  21. Multiscale Skeletons

  22. Multiscale Skeletons • Stability under rotations • Accepts objects with holes • Fast algorithms based on graph theory

  23. Other Functionalities • Thinning (Lam-Suen) • Hough Transform • Fractal Dimension • Edge detector by Fourier derivatives • Watershed segmentation • Fast euclidean distance transforms

  24. 2D Gaussian filter

  25. 2D Gaussian filtering

  26. Median Filtering • Non-linear filter with low border shifting

  27. Border Enhancement • Partial derivative approximation • Two orthogonal directions • Gradient magnitude • Convolution masks

  28. Border Enhancement Sobel ImageMagick

  29. Curvature • Useful local measure

  30. Mathematical Morphology • Dilation • Erosion • Arbitrary structuring elements

  31. Geometric Tansformations • Coded using ImageMagick • Mogrify command

  32. Edge follower • Extracts parametric coordinates • C(t) = (x(t), y(t)) • Closed curves and contours

  33. Histogram Equalization • Spreads the distribution of intensities

  34. Contributions • Denoising by min/max curvature flow (thanks to L. Estrozi) • Routines for processing images from optical interferometry (J. Druel) • Adaptive thresholding (ImageMagick)

  35. Future Work • Better integer support • Test suite • Improve graphical display • External doc for Animal

  36. Future Work • Integration with Imagemagick and Gandalf libraries • CVS • XML Help • Usability • New routines

  37. Conclusions • High demand for SIP • It is still the only free tool for easy prototyping of image analysis solutions, not limited to simple processing techniques • Low cost • Valuable experience with free software

  38. Personal Facts • Undergrad research since 1999 • Cybernetic Vision Research Group • Very well equipped • Productive environment • I'm currently working with distance transforms, Voronoi diagrams, skeletonization, and related techniques. • Plan to do a PhD in Image Processing.

  39. References

More Related