Computer Vision, winter 2012-13 CS Department, Technion.

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Presentation transcript:

Computer Vision, winter CS Department, Technion

Topics The Gaussian Pyramid The Laplacian Pyramid Applications: Pattern Matching Coding (Compression) Enhancement Blending

Gaussian Pyramid

Approximation filter is not Gaussian A 5 tap binomial kernel: 2D extension:

Pattern Matching

Laplacian Pyramid

Approximation of the Laplacian of each scale Constructed by Difference of Gaussian (DoG) layers

Laplacian Pyramid

Image Coding

Enhancement

Pyramid Blending

Step I - Create Blend Masks

Step II Weighted sum over each Laplacian pyramid scale (of the images) independently Gaussian pyramid of masks, or simple resizing of masks to correct dimensions Blend 1 Blend 1 Mask Blend 2Blend 2 Mask

Step III Standard Laplacian pyramid reconstruction of blended scales

Implementation Issues Image registration Feathering Over/under flows outside [0,1] MATLAB function: impyramid() Only Gaussian pyramid ‘reduce’ or ‘expand’ modes MATLAB function: imresize() Useful for masks resizing

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