Stephen James Hardy
Canon Inc.
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Featured researches published by Stephen James Hardy.
digital image computing: techniques and applications | 2009
Peter Alleine Fletcher; Kieran G. Larkin; Stephen James Hardy
Image watermarking is the robust, imperceptible embedding of a small quantity of data into a digital image, and the subsequent recovery of this data, perhaps after the watermarked image has been distorted. We present a new watermarking technique which is robust to many image distortions, in particular arbitrary affine transformations of the image. The method achieves its robustness through the use of one-dimensional chirp functions. An affine-invariant detection method exists for such functions using a Radon transform, yet they are not detected trivially by a malicious attacker. The method also provides a way to determine any affine transformation applied to the watermarked image by using an affine-invariant property of groups of intersecting lines.
Archive | 2005
Kieran Gerard Larkin; Peter Alleine Fletcher; Stephen James Hardy
Archive | 2005
Timothy Merrick Long; Peter Alleine Fletcher; Stephen James Hardy
Archive | 2005
Stephen Farrar; Stephen James Hardy; Peter Alleine Fletcher; Kieran Gerard Larkin; Eric Lap Min Cheung; Stephen Edward Ecob
Archive | 2003
Peter Alleine Fletcher; Stephen James Hardy; Kieran Gerard Larkin
Archive | 2008
David P. Morgan-Mar; Stephen James Hardy; Matthew Raphael Arnison; Kieran Gerard Larkin; Christine Anne Deller
Archive | 2010
Matthew Christian Duggan; Eric Wai-Shing Chong; Stephen James Hardy
Archive | 2008
Tuan Quang Pham; Stephen James Hardy
Archive | 2004
Stephen James Hardy; Peter Alleine Fletcher; Kieran Gerard Larkin
Archive | 2008
Peter Alleine Fletcher; Steven Parker; Ben Yip; Scott Alexander Rudkin; Kieran Gerard Larkin; Stephen James Hardy; Takeshi Yazawa