CAGD&C G Color Analogies and its applications reporter:Shuangmin Chen

CAGD&C G Question On TV,we often see that a scene with different seasons show its time flies. Because the speed of changing the films is so fast. I found some pictures about a scene with different seasons on the internet.They are made by the photographers as heard.

CAGD&C G Pictures P1 P2 Any flaws??? Any difficulties???

CAGD&C G Discussion Our question:if we can deal with a picture and can get different seasons pictures,that’s wonderful!But it’s a little difficult. Discussion:Is there any way that we can make it???—maybe

CAGD&C G My job—Color Analogies Two papers: 1.Image Analogies 2.Color Transfer between Images Color Analogies result

CAGD&C G Introduction to the two papers Image Analogies ---Aeron Hertzmann et.al (2001Siggraph) Style transfer

CAGD&C G Introduction to the two papers Color Transfer between Images ---- Erik Reinhard et.al Color transfer

CAGD&C G Guideline Color space introduction —process in color space Formula in Color Transfer between images Similar to a new formula Results show

CAGD&C G Introduction to RGB We can get any color by blending with RGB Definition with cubic

CAGD&C G Introduction to lab color space In Photoshop,the range of l is 0 to 100;and in color palete,the ranges of a and b are both 120 to -120.

CAGD&C G Why decorrelation is better? Apply different operations in different color channels that without undesirable crosschannel artifacts. The data in lab space is more compressed (log space) RGB:correlations between the different channel’s values. (0,0,0) - (255,255,255)

CAGD&C G Guideline Color space introduction —process in color space Formula in Color Transfer between images Analogy to a new formula Results show

CAGD&C G Color constancy correction Subtract the mean from the data points Scale the data points comprising the synthetic image by factors determined by the respective standard deviation

CAGD&C G Color constancy correction add the averages computed for the photagraph. +

CAGD&C G Formula in Color Transfer between images dst:destination(target);src:source; standard deviation m– mean value Linear equation

CAGD&C G Guideline Color space introduction —process in color space Formula in Color Transfer between images Analogy to a new formula Results show

CAGD&C G Analogy to a new formula Color Transfer: BA B’ src dst A,B are given!!!

CAGD&C G Formula in Color Transfer between images linear equation: slope k = ( 注 :src,dst 是已知的 ) through a point:(, ) (1) (2) (3)

CAGD&C G Analogy to a new formula Image Analogies A,A’,B are given!!!

CAGD&C G Analogy to a new formula (1) (2) Details show on blackboard!

CAGD&C G Results show result 1

CAGD&C G Results show result 2

CAGD&C G Results show result 3

CAGD&C G Results show result 4