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Digital Image Processing HW#3-Image Pyramid

Digital Image Processing HW#3-Image Pyramid. TA: Yun-Da Wu 吳運達. Image Pyramid. A pyramid image structure System block diagram. Approximation Filter. 2 ↓. Level j-1 Gaussian. 2 ↑. Interpolation Filter. Level j Input image. Level j Prediction residual. - +. Level j-1.

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Digital Image Processing HW#3-Image Pyramid

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  1. Digital Image Processing HW#3-Image Pyramid TA: Yun-Da Wu 吳運達

  2. Image Pyramid • A pyramid image structure • System block diagram Approximation Filter 2↓ Level j-1 Gaussian 2↑ Interpolation Filter Level j Input image Level j Prediction residual - +

  3. Level j-1 Gaussian filter & ↓2 ↑2&interpolation filter Level j(base) Prediction Residual Level j

  4. A Gaussian pyramid • A prediction residual pyramid Level j(base) Level j-1 Level j-2 Level j-3 Level j-2 Level j-1 Level j

  5. Approximation Filter • Using Gaussian Filter • Mask (3x3) • Ex:

  6. Downsampling & Upsampling • Downsampling • Upsampling ↓2 ↑2

  7. Interpolation Filter • Using bilinear interpolation Interpolation Ex: = ( + )/2 0,1 0,0 0,2 Interpolation Order: 1 2 = ( + + + )/4 1,1 0,1 1,0 2,1 1,2

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