Color Harmonization － ACM SIGGRAPH 2006 Speaker ：李沃若

Color Harmonization － ACM SIGGRAPH 2006

Speaker：李沃若

Authors

Daniel Cohen-Or Tel-Aviv University Volume graphics Visualization of large environments Shape modeling Image and surface manipulation

Authors

Olga Sorkine Tel-Aviv University Student of Daniel Cohen-Or Computer Graphics

Ran Gal

Authors

Ran Gal Tel-Aviv University Student of Daniel Cohen-Or Computer Graphics and Vision Work for Microsoft Corporation o

n the new XBOX 360

Authors

Ying-Qing Xu Visual Computing Group, Microsof

t Research Asia Learning based digital fac

ial cartoon generation Computer animation

Relative Paper

Understanding Color. [Holtzschue 2002]

Color design support system considering color harmony. [Tokumaru et al. 2002]

Color Index: Over 1,100 Color Combinations, CMYK and RGB Formulas, for Print and Web Media. [Krause 2002]

Introduction

Harmonic colors are sets of colors that are aesthetically pleasing in terms of human visual perception.

Finds the best harmonic scheme for the image colors.

Color Wheel

Describe the color distribution

Use HSV color space H:0~360(hue) S:0~1 (saturation) V:0~1 (value)

Harmonic templates

Sum up from experience

Some natural images

Different representation

Harmonic Schemes

1. Fit a harmonic template T to the hue histogram of the image.

2. Determine color shift direction.

3. Shift of color.

Fit a template

Fine αand a template that minimize the function:

The least distant of hue between point and template

TemplateOrientation

Saturation of p

Color shift

C(p) : the central hue of the sector associated with pixel p

w : the arc-width of the template sector :normalized Gaussian function

Problem

“splitting” of a contiguous region of the image

Add Region Segmentation

Fine the optimal label assignment minimizes the energy:

Hue distant to assign edge

color coherence between neighboring pixels assigned tothe same label.

Pixel’s label

Min-cut / max-flow

Function can be turnedinto min-cut/max-flowproblem.

Energies turn into the cost of road.

Details see [Boykov and Jolly 2001].

Better result

Other results

Other results

Other results

References

BOYKOV, Y., AND JOLLY, M.-P. 2001. Interactive graph cuts for optimal boundary and region segmentation of objects in N-D images. In Proceedings of ICCV, 105–112.

COLOR WHEEL EXPERT, 2000. http://www.abitom.com/. MOROVIC, J., AND LUO, M. R. 2001. The fundamentals of gamut

mapping: A survey. Journal of Imaging Science and Technology 45, 3, 283–290.

PRESS, W. H., TEUKOLSKY, S. A., VETTERLING, W. T., AND FLANNERY, B. P. 1992. Numerical Recipes in C: The Art of Scientific Computing. Cambridge University Press, New York, NY, USA.

End