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MORPHING

MORPHING. Presentation By: SWARUP DEEPIKA JAGMOHAN Date: 22 OCT 2002 Course: COMPUTER GRAPHICS. BRIEF INTRODUCTION. Brief Introduction: . Morphing – derived from the word metamorphosis. Metamorphosis means to change shape, appearance or form.Example:. WHAT IS MORPHING?.

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MORPHING

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  1. MORPHING Presentation By: SWARUP DEEPIKA JAGMOHAN Date: 22 OCT 2002 Course: COMPUTER GRAPHICS

  2. BRIEF INTRODUCTION

  3. Brief Introduction: • Morphing – derived from the word metamorphosis. • Metamorphosis means to change shape, appearance or form.Example:

  4. WHAT IS MORPHING?

  5. What is morphing? • Morphing can be defined as: - Transition from one object to another. - Process of transforming one image into another. • An animation technique that allows you to blend two still images, creating a sequence of in – between pictures that when played in Quick Time, metamorphoses the first image into the second.

  6. HOW IS MORPHING DONE?

  7. General Idea • As the metamorphosis proceeds , - The first image is gradually distorted and is faded out. - The second image starts out totally distorted toward the first and is faded in.

  8. Steps Involved: • The morph process consists of :- 1) Warping two images so that they have the same “shape’’. 2) Cross dissolving the resulting images .

  9. WARPING

  10. Warping: • A warp is a 2-D geometric transformation and generates a distorted image when it is applied to an image. • Warping an image means : apply a given deformation to it. • Two ways to warp an image:- Forward mapping.  Reverse mapping.

  11. Forward Mapping • Each pixel in source image is mapped to an appropriate pixel in destination image. • Some pixels in the destination image may not be mapped.

  12. Reverse Mapping • This method goes through each pixel in the destination image and samples an appropriate source image pixel. • All destination image pixels are mapped to some source image pixel. • This mapping is used in the Beier/Neely line morphing method.

  13. CROSS DISSOLVING

  14. Cross Dissolving • A cross-dissolve is a sequence of images which implements a gradual fade from one to the other.

  15. THE MORPHING PROCESS

  16. Morphing Process • Step I : Interpolating the lines: Interpolate the coordinates of the end points of every pair of lines. • Step II : Warping the ImagesEach of the source images has to be deformed towards the needed frame. The deformation works pixel by pixel is based on the reverse mapping. This algorithm is called Beier-Neely Algorithm.

  17. BEIER-NEELY ALGORITHM IDEA • IDEA IS TO: • Compute position of pixel X in destination image relative to the line drawn in destination image.(x,y)  (u,v)

  18. BEIER-NEELY ALGORITHM IDEA Contd.. 2) Compute coordinates of pixel in source image whose position relative to the line drawn in source image is (u,v). (u,v) (x’,y’)

  19. BEIER-NEELY ALGORITHM IDEA Contd..

  20. Beier-Neely Algorithm For each pixel X=(x,y) in the destination image DSUM=(0,0) , weightsum=0 for each line(Pi, Qi) calculate(ui,vi) based on Pi, Qi calculate (xi’, yi’) based on u,v and Pi, Qi calculate displacement Di = Xi’ – X for this line compute weight for line(Pi,Qi) DSUM+=Di*weight weightsum+=weight (x’y’) = (x,y)+DSUM/weightsum color at destination pixel(x,y) = color at source pixel(x’y’)

  21. MORPHING EXAMPLES

  22. Examples

  23. Examples Contd..

  24. APPLICATIONS OF MORPHING

  25. Applications • Used to produce special effects in entertainment industry. Example : Michael Jackson’s Black or white music video.

  26. Application Contd.. • In the Terminator Movie

  27. MORPHING SOFTWARE

  28. Morphing Software • There are many morphing softwares available on the internet: 1) Morph Man 3.1 http://www.stoik.com/morphman/morphman.htm 2) Morpheus Softwarehttp://www.morpheussoftware.net/

  29. Examples I Tried Using Morph Man 3.1

  30. References: • Warping and Morphing of Graphical Objects by Bruno Costa, Jonas Gomes ,1998. • Morphing Magic by Scott Anderson , 1993 • Beier T. Neely S. Feature based image metamorphosis. Proceedings of SIGGRAPH’92 • http://www.cs.rochester.edu/u/www/u/kyros/Courses/CS290B/Lectures/lecture-18/sld002.htm

  31. THANK YOU

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