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Survey of Background Blurring

Survey of Background Blurring. Shadow 2008.10.07. Outline. Motivation Introduction Related work/Paper survey System design Todo list. Motivation. Image enhancement 想要凸顯主題， 但是 DSLR 很貴、鏡頭很貴 …… 景的閒雜人物很討厭 For privacy preserving 利用 refocus 來達到 image 轉成 movie 的效果. Introduction.

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Survey of Background Blurring

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  1. SurveyofBackground Blurring Shadow 2008.10.07

  2. Outline • Motivation • Introduction • Related work/Paper survey • System design • Todo list

  3. Motivation • Image enhancement • 想要凸顯主題， • 但是DSLR很貴、鏡頭很貴…… • 景的閒雜人物很討厭 • For privacy preserving • 利用refocus來達到image轉成movie的效果

  4. Introduction • Depth of field （景深） • 焦距 • 光圈 • 物距 • Bokeh (散景)

  5. By DSLR

  6. By DC

  7. By Photoshop

  8. Related Work Refocusing : Active Refocusing of Images and Videos [siggraph07]

  9. Related Work Refocusing : Active Refocusing of Images and Videos [siggraph07] Depth hint: active project light Blur kernel: Gaussian blur

  10. Related Work • Image and Depth from a Conventional Camera with a Coded Aperture [siggraph07]

  11. Related Work Coded aperture- reduce uncertainty in scale identification Conventional Coded Larger scale Correct scale Smaller scale

  12. Related Work • Single Image Dehazing [siggraph08] • Radiative transport equation

  13. Related Work • Single Image Dehazing [siggraph08]

  14. Related Work • Single Image Dehazing [siggraph08]

  15. Related Work • 要做refocusing 要找出depth map • Usage of Depth map • Reconstruct 3D scene • 3D shape recovery

  16. Related Work • Depth Recovery • Depth from stereo • Structure from motion • Shape from shading • Range from focus • Depth from defocus

  17. Related Work • How to find depth map • Perspective of two images • Blur effect of an image • Other hint • Do we really need aexactdepth map?

  18. System design

  19. System design • Object segmentation Image matting : • Hard cut • Grab cut • Lazy snapping • Watershed • Mean-shift • Soft cut • Tri-map alpha matting • Color segmentation

  20. System design • Depth map reconstruction • Vanish point or horizontal line

  21. System design • Refocus the Image • different blur kernel

  22. TodoList • 有depth map 產生出有淺景深效果的result • 有object segment, subject 等hint 產生depth map • Object segmentation (with/without user hint)

  23. Application

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