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Color Analogies and its applications

Color Analogies and its applications. reporter:Shuangmin Chen. 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.

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Color Analogies and its applications

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  1. Color Analogies and its applications reporter:Shuangmin Chen

  2. 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.

  3. Pictures • 1. • 2. P1 P2 Any flaws??? Any difficulties???

  4. 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

  5. My job—Color Analogies • Two papers: 1.Image Analogies 2.Color Transfer between Images Color Analogies result

  6. Introduction to the two papers • Image Analogies ---Aeron Hertzmann et.al (2001Siggraph) Style transfer

  7. Introduction to the two papers • Color Transfer between Images ---- Erik Reinhard et.al Color transfer

  8. Guideline • Color space introduction —process in color space • Formula in Color Transfer between images • Similar to a new formula • Results show

  9. Introduction to RGB • We can get any color by blending with RGB Definition with cubic

  10. 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.

  11. 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)

  12. Guideline • Color space introduction —process in color space • Formula in Color Transfer between images • Analogy to a new formula • Results show

  13. 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

  14. Color constancy correction • add the averages computed for the photagraph. + <lt> + <at> + <bt>

  15. Formula in Color Transfer between images Linear equation dst:destination(target);src:source; standard deviation m– mean value

  16. Guideline • Color space introduction —process in color space • Formula in Color Transfer between images • Analogy to a new formula • Results show

  17. Analogy to a new formula • Color Transfer: B’ B A dst src A,B are given!!!

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

  19. Analogy to a new formula • Image Analogies A,A’,B are given!!!

  20. Analogy to a new formula (1) Details show on blackboard! (2)

  21. Results show result 1

  22. Results show result 2

  23. Results show result 3

  24. Results show result 4

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