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Extracting Depth and Matte using a Color-Filtered Aperture

This guide explores the method of extracting depth and matte information from images using a color-filtered aperture. It details the preparation process, including the installation of color separation filters. The principles underlying this technique are discussed, focusing on how images can be segmented to differentiate colors and extract depth information accurately. The effectiveness of this method is compared with traditional techniques, showcasing its ability to isolate subjects against similar color backgrounds.

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Extracting Depth and Matte using a Color-Filtered Aperture

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  1. Extracting Depth and Matte using a Color-Filtered Aperture

  2. Extracting Depth and Matte using a Color-Filtered Aperture • 簡介 • 準備 • 原理 • 裁切 • 範例 • 比較

  3. 簡介 • 單一取景 • 深度資訊 • RGB分離造成偏移 • 相近色背景也可取出主體

  4. 準備 • 安裝分色濾鏡

  5. 準備 • 安裝分色濾鏡

  6. 準備 • 安裝分色濾鏡

  7. 準備 • 安裝分色濾鏡

  8. 原理

  9. 原理

  10. 原理

  11. 原理 • 三種顏色，三個面 Ir Ig Ib • Ir(x+d, y), Ig(x, y−d), Ib(x−d, y)

  12. 原理 • 畫面分割為小視窗

  13. 原理 • 畫面分割為小視窗 • SI (x, y; d) = {(Ir(s+d, t), Ig(s, t−d), Ib(s−d, t)) | (s, t) ∈ w(x, y)} • 最小化

  14. 原理

  15. 裁切

  16. 裁切

  17. 裁切

  18. 裁切

  19. 裁切

  20. 裁切 • SF (x, y; d) = {(Fr(s+d, t), Fg(s, t−d), Fb(s−d, t)) | (s, t) ∈ w(x, y)} li is the distance of the i-th color in SF (x, y; d) from the line fitted to the elongated color cluster (i.e., the first principal axis).

  21. 裁切 • SF (x, y; d) = {(Fr(s+d, t), Fg(s, t−d), Fb(s−d, t)) | (s, t) ∈ w(x, y)}

  22. 裁切 決定下個α

  23. 範例

  24. 比較

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