feature-based image metamorphosis

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