feature-based image metamorphosis
DESCRIPTION
Feature-Based Image Metamorphosis. Thaddeus Beier, Shawn Neely ACM SIGGRAPH 92’. 97753003 資碩一 陳界誠. What is Morphing?. Morphing = Warping + Cross-dissolving Generalize image warping with a cross-dissolve between images. Warping: shape transform Distort the first image into second one. - PowerPoint PPT PresentationTRANSCRIPT
Thaddeus Beier, Shawn NeelyACM SIGGRAPH 92’
Feature-Based Image Metamorphosis
97753003 資碩一 陳界誠
What is Morphing?Morphing = Warping + Cross-dissolving
Generalize image warping with a cross-dissolve between images.
Warping: shape transformDistort the first image into second one.
Cross-dissolving: color transformFirst image fade out while second image fade
in.
Two way to warp an imageForward mapping
Scans through the source image pixel by pixel, and copies them to appropriate place in the destination image.
Some pixels is the destination might not be painted.
Reverse mappingGoes through the destination image pixel by
pixel and samples the correct pixel from the source image.
One Pair of Lines Transformation
One Pair of Lines Transformation
One Pair of Lines Transformation
Multiple Pairs of Lines
Multiple Pairs of Lines
Multiple Pairs of Lines
Advantages and Disadvantages
AdvantageIt is much more expressive.
DisadvantageSpeed and controlGhost image: unexpected interpolation
image
Michael JacksonBlack or White (1) Black or White (2)
Process flow
Input lines segments
Lines interpolation
Warping
Bilinear lines interpolation
Image blending
Bilinear Lines interpolation
Image blendingBlend = (1-t)*Src + t*dst , 0 <= t <= 1
T=0 T=0.5 T=1