Stephen Pollard

Researcher
Printing and Content Delivery Lab
Bristol

Biography

Stephen is a researcher in the Print Production Automation Lab working on the  Security Printing and Imaging Engineering Geared for Enterprise Lifecycle (SPIEGEL) program. Security printing and imaging provides brand differentiation, brand protection and anti-counterfeiting through novel security algorithms, printing approaches and image analysis technologies. Enterprise applications range from track and trace and inspection to authentication, policy enforcement and forensics

He received a PhD in Computer Vision from the Artificial Intelligence Vision Research Unit of the University of Sheffield in 1985 and since joining HP Labs in 1992 has worked on a range of imaging technologies which have included page decomposition, document imaging, demosaicing, color processing, focus algorithms and various forms of image matching. He has helped in the delivery of numerous HP Labs technologies to divisional partners including: text enhancement for HP's first color copier; the imaging pipeline for Capshare; camera pipeline components for PDA, digital camera and mobile phone modules; and the six color pipeline for the ScanJet G4050/G4010.

 

Research interests

Stephen has research interests that span the fields of image processing and computer vision and in particular has been active in the areas of: image matching and object recognition, stereo processing and motion analysis, text and document analysis and colour science.

Publications

Journal Papers
Pollard S B, Mayhew J E W, and Frisby J P (1985) PMF: A stereo correspondence algorithm using a disparity gradient limit, Perception 14, 449-470, also published in 3D Model Recognition from Stereoscopic Cues, Eds Mayhew and Frisby, MIT Press, Cambridge, Massachusetts.
Pollard S B, Porrill J, Mayhew J E W, and Frisby J P (1987) Matching geometrical descriptions in three space, Image and Vision Computing, Vol 2, No 5 73-78, also published in 3D Model Recognition from Stereoscopic Cues, Eds Mayhew and Frisby, MIT Press, Cambridge, Massachusetts.
Porrill J, Pollard S B and Mayhew J E W (1987) The optimal combination of multiple sensors including stereo vision, Image and Vision Computing, Vol 2, No 5 174-180, also published in 3D Model Recognition from Stereoscopic Cues, Eds Mayhew and Frisby, MIT Press, Cambridge, Massachusetts.
Porrill J, Pollard S B, Pridmore T P, Bowen J, Mayhew J E W and Frisby J P (1988) TINA: A 3D vision system for pick and place, Image and Vision Computing, Vol 6, No 2 91-99, also published in Proc. AVC 3, Cambridge, England, 65-72 and in 3D Model Recognition from Stereoscopic Cues, Eds Mayhew and Frisby, MIT Press, Cambridge, Massachusetts.
Pollard S B, Pridmore T P, Porrill J, Bowen J, Mayhew J E W and Frisby J P (1989) Geometrical modelling from multiple stereo views, International Journal of Robotics Research, Vol 8, No 4 3-22.
Pollard S B, Porrill J and Mayhew J E W (1990) Experiments in vehicle control using predictive feed forward stereo, Image and Vision Computing, Vol 8, No 1 63-70.
Pollard S B and Frisby J P (1990) Transparency and the uniqueness constraint in human and computer stereo vision, Nature, Vol 347, 553-556.
Pollard S B, Porrill J and Mayhew J E W (1991) Recovering partial wire frame descriptions from stereo data, Image and Vision Computing, Vol 9, No 1 58-65, also published in Proc. BMVC90 31-36.
Rygol M, Pollard S B and Brown C R (1991)  A multiprocessor 3D vision system for pick and place, Image and Vision Computing, Vol 9, No 1 33-38, also published in Proc. BMVC90 169-174 and in 3D Model Recognition from Stereoscopic Cues, Eds Mayhew and Frisby, MIT Press, Cambridge, Massachusetts.
Porrill J and Pollard S B (1991) Curve matching and stereo calibration, Image and Vision Computing, Vol 9, No 1 45-50, also published in Proc. BMVC90 37-42.
Rygol M, Pollard S B and Brown C R (1991)  MARVIN & TINA: A multiprocessor 3D vision system, Concurrency: Practice and Experience, Vol 3, No 4 333-356.
Pollard S B, Pilu M, Hayes S  and Lorusso A (2000) View Synthesis by Trinocular Edge Matching and Transfer, Image and vision Computing, Vol 18,  749-757, also published in  Proc. BMVC98 Southampton,  770-779.
Pollard S B and Pilu M (2005) Building cameras for capturing documents, IJDAR 7, 123-137.

Additional Refereed Conference Proceedings
Pollard S B, Mayhew J E W, and Frisby J P (1984) PMF: A stereo correspondence algorithm using a disparity gradient limit, ECVP-7 Cambridge published in Perception 13 (abstract only).
Pollard S B, Porrill J, Mayhew J E W and Frisby J P (1985) Disparity gradient, Lipshitz continuity and computing stereo correspondences, Proc. Third International Symposium of Robotics Research, Gouviex, France, MIT Press 19-26, also published in Image Understanding 1989, Eds Ulman and Richards, Ablex, Norwood, New Jersey and in 3D Model Recognition from Stereoscopic Cues, Eds Mayhew and Frisby, MIT Press, Cambridge, Massachusetts.
Porrill J, Pollard S B, Pridmore T P, Bowen J, Mayhew J E W and Frisby J P (1988) TINA: The Sheffield AIVRU vision system, IJCAI 9, Milan 1138-21144.
Pollard S B, Pridmore T P, Porrill J, Mayhew J E W and Frisby J P (1987) Components of a stereo vision systems, Proc. Fourth International Symposium of Robotics Research, MIT Press, 229-235.
Pollard S B (1987) The PMF stereo algorithm: theory and implementation, BCS Parallel Architectures and Computer Vision Workshop, Oxford, Eds Brady and Page, OUP.
Pollard S B, Pridmore T P, Porrill J, Mayhew J E W and Frisby J P (1988) A 3D vision system for robtics, Proc. IEE International Specialist Seminar, The Design and Application of Parallel Digital Processors, Lisbon, Portugal, No 298, 43-47.
Muck K, Porrill J, Pollard S B, Mayhew J E W and Frisby J P (1989) From depth map to wireframe, Proc. of the Optical Society of America, Topical Meeting on Image Understanding and Machine Vision, Cap Cod.
Pollard S B, Porrill J and Mayhew J E W (1989) Experiments in vehicle control using predictive feed forward stereo, Proc. Fifth International Symposium of Robotics Research, Tokyo, MIT Press, 173-180.
Pollard S B, Porrill J and Mayhew J E W (1989) Predictive feed forward stereo processing, Proc AVC 5, Reading.
Vergnet R L, Pollard S B and Mayhew J E W (1989) Stereo matching of line segments based upon 3-dimensional heuristic with potential for parallel implementation, Proc AVC 5, Reading.
Sykes F P, Pollard S B and Mayhew J E W (1989) Hypothesis and verification in 3D model matching, Proc AVC 5, Reading
Rygol M, Pollard S B, Brown C R and Kay J (1990)  MARVIN & TINA: A multiprocessor 3D vision system, Proc. Transputer Applications 90.
Cai L D, Porrill J, Pollard S B, Mayhew J E W and Frisby J P (1990) Segmentation of planar curves using local and global behaviour analysis, Proc. BMVC90, 247-252.
Rygol M, McLauchlan P, Courtney P, Pollard S B, Porrill J, Brown C R and Mayhew J E W (1991) Parallel 3D vision for vehicle navigation and control, Proc. Transputing 91.
Buxton B F, Castelow D A, Rygol M, McLauchlan P, and Pollard S B (1991) Developing a stereo vision system for control of an AGV, Proc Second IEE International Specialist Seminar on the Design and Application of Parallel Digital Processors, Lisbon, Portugal.
Buxton B F, Castelow D A, Rygol M, McLauchlan P, and Pollard S B (1991) A platform for the development of a stereo vision system for the control of a robot vehicle, Proc of ESA workshop on computer vision and image processing for spacebourne applications, ESTEC, The Netherlands.
Burbello F, Pollard S B, Porrill J and Mayhew J E W (1991) Retrieval of High-Level Data Structures from Stereo Vision Data, Proc. AI*IA 1991, 312-321.
Pollard S B and Porrill J (1992) Robust Recovery of 3D Ellipse Data, Proc. BMVC92, Leeds, 39-48
Pollard S B, Pilu M, Hayes S and Lorusso A (1998), View synthesis by edge matching and transfer, IEEE Workhop on Applications of  Computer Vision, Princeton, NJ,  168-179.
Pollard S B and Hayes S (1998) View Synthesis By edge Transfer with Application to the Generation of Immersive Video Objects, Proc. ACM. Symp. On Virtual Reality Software and Technology, Taipei, 91-98.
Lacey A J, Thacker N A, Courtney P and Pollard S (2001) TINA 2001: The Closed Loop 3D Model Matcher, Proc. BMVC01.
Pilu M and Pollard S B, (2002) A light-weight text image processing method for handheld embedded cameras. Proc. BMVC02.
Hunter A, DiCarlo J & Pollard S (2008) Six Color Scanning, Proc CGIV08, Terrassa-Barcelona.

Additional Book Chapters
Pollard S B, Porrill J, Mayhew J E W and Frisby J P (1990) 3D Robot Vision, Trends in IT, Eds Linkens and Nicolson, Peter Peregnus, London.
Pollard S B, Mayhew J E W, and Frisby J P (1991) Implementation details of the PMF stereo algorithm, in 3D Model Recognition from Stereoscopic Cues, Eds Mayhew and Frisby, MIT Press, Cambridge, Massachusetts.
Frisby J P and Pollard S B (1991) Computational issues in solving the stereo correspondence problem, in Computational Models of Visual Processing, Eds Landy and Movshon, Cambridge, Massachusetts.

Patents

16

Professional activities

Committee Member of the British Machine Vision Association.
Reviewer for British Machine Vision Conference 2004-2009.
Area chair for British Machine Vision Conference 2004, 2005, 2008 & 2009.