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image stitching on a camera cell phone t. brow, s. elayaperumal, a. rajgarhia cs223b winter 2008

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Image Stitching on a Camera Cell Phone T. Brow, S. Elayaperumal, A. Rajgarhia CS223B Winter 2008

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Page 1: Image Stitching on a Camera Cell Phone T. Brow, S. Elayaperumal, A. Rajgarhia CS223B Winter 2008

Image Stitching on a Camera Cell Phone

T. Brow, S. Elayaperumal, A. Rajgarhia

CS223BWinter 2008

Page 2: Image Stitching on a Camera Cell Phone T. Brow, S. Elayaperumal, A. Rajgarhia CS223B Winter 2008

Problem

• CPU Size / Memory Budget• CV Libraries not Available

Page 3: Image Stitching on a Camera Cell Phone T. Brow, S. Elayaperumal, A. Rajgarhia CS223B Winter 2008

Viewfinder Alignment

• To Estimate Homography• For Faster Similarity Metric

Images from “Viewfinder Alignment” by A. Adams, N. Gelfand & K. Pulli (Eurographics 2008)

Page 4: Image Stitching on a Camera Cell Phone T. Brow, S. Elayaperumal, A. Rajgarhia CS223B Winter 2008

VIDEO

Page 5: Image Stitching on a Camera Cell Phone T. Brow, S. Elayaperumal, A. Rajgarhia CS223B Winter 2008

Better Stitching in Less Steps

• Corner Detector• Estimate Area of Corresponding Corners

• Run NCC in Nearby Corners• Find Homography

Page 6: Image Stitching on a Camera Cell Phone T. Brow, S. Elayaperumal, A. Rajgarhia CS223B Winter 2008

Finding CorrespondencesNearby Search Size: 20 pixels

NCC Threshold: 0.80

Nearby Search Size: 10 pixels

NCC Threshold: 0.95

Page 7: Image Stitching on a Camera Cell Phone T. Brow, S. Elayaperumal, A. Rajgarhia CS223B Winter 2008

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