Manga Colorization

790 views
651 views

Published on

Presentation of Manga Colorization by Yingge Qu at The Chinese University of Hong Kong for my CSci 8980 Computer Science Design class taught by Gary Meyer at the University of Minnesota in Fall 2009.

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
790
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
9
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Manga Colorization

  1. 1. M a n g a C o lo r iza t io n Y in g g e Q u T ie n -Ts in W o n g Ph e n g - A n n H e n g The Chinese University of Hong Kong MXMLLN Montgomery
  2. 2. Introduction Contributions Results Critique O u t lin e Paper •Introduction – Motivation – Previous Work •Contributions – Pattern Segmentation – Colorization ● Results Critique •Motivation •Technique Generalization MXMLLN Montgomery
  3. 3. Introduction Contributions Results Critique M o t iv a t io nProblemI. Manga are seldom colored due to the time and labor involved.II. The fine artistic details used to create the visual content andatmosphere are ill-suited for digital colorization techniques, i.e., b I.Half-toning II.Screening III.Hatching MXMLLN Montgomery
  4. 4. Introduction Contributions Results Critique Pr e v io u s W o r k User-Directed Colorization● User scribbles color in desired regions● Using constraint quadratic optimization problem, colorization isachieved under the assumption that adjacent pixels with similarintensities should be similarly colored MXMLLN Montgomery
  5. 5. Introduction Contributions Results Critique Pr e v io u s W o r k Semi-Automated Colorization● Colorization by matching swatches of greyscale image toreference color image● Auto regression filtering from the relationship between A and A,applied to input image B to create B● Colorization by transferring color from an example segmentedimage using high-level pixel context MXMLLN Montgomery
  6. 6. Introduction Contributions Results Critique Pr e v io u s W o r k Limitations● Works for intensity continuity, like photographs and videos● Is unable to handle pattern continuity, like illustrations MXMLLN Montgomery
  7. 7. Introduction Contributions Results Critique Pr e v io u s W o r k Texture-Based Segmentation● Texture is classified, segmented, and synthesized based ontexture properties of repeated elements: ● Size ● Aspect ratio ● Orientation ● Brightness ● Density MXMLLN Montgomery
  8. 8. Introduction Contributions Results Critique Im p le m e n t a t io n Color propagation employs a zero surface, geometric, level set method For more details, please refer to the text MXMLLN Montgomery
  9. 9. Introduction Contributions Results Critique C o n t r ib u t io n sPattern-continuous regions● Uniformly sample along userscribble to compute patternfeatures: ● Cluster feature patterns ● Identify major cluster ● Find average of major cluster● Allows some error in scribblingover unintended areas MXMLLN Montgomery
  10. 10. Introduction Contributions Results Critique C o n t r ib u t io n sPattern-continuous regions● Propagate color until patternreaches abrupt change● This step allows both splittingand merging between boundaries ● Disjoint regions can be colored with single scribble MXMLLN Montgomery
  11. 11. Introduction Contributions Results Critique C o n t r ib u t io n sIntensity-continuous regions● Leak proofing preventspropagation from leakingthrough gaps MXMLLN Montgomery
  12. 12. Introduction Contributions Results Critique C o n t r ib u t io n sColorization● Stroke-preservingcolorization ● Colorization is achieved by bleeding out from strokes and patterns MXMLLN Montgomery
  13. 13. Introduction Contributions Results Critique C o n t r ib u t io n sColorization● Pattern-to-shading ● Hatching and screening shading effects can be portrayed smoothly by color shading MXMLLN Montgomery
  14. 14. Introduction Contributions Results Critique C o n t r ib u t io n sColorization● Multi-color transition ● Colors are blended together based on their distance from the user scribble MXMLLN Montgomery
  15. 15. Introduction Contributions Results Critique Re s u lt sLimitations● System regards overlappedpatterns as distinct MXMLLN Montgomery
  16. 16. Introduction Contributions Results Critique C r it iq u eMotivation● Mangas are notcolored because ofthe extensiveprinting cost● Many techniques,such as hatching andscreening shading,may actually be lesslabor intensive incolor MXMLLN Montgomery
  17. 17. Introduction Contributions Results Critique C r it iq u e Technique generalization ● The authors never identify other applications of their technique ● More broadly than manga, their work is suitable for any intensity-homogenous images and videos. ● Including additional applications broadens the scope and reader base of a publication MXMLLN Montgomery

×