Pierre-Jean Lapray
Pierre-Jean Lapray Bourgogne Alsace UHA IRIMAS Laboratory
Associate Professor
Université de Haute Alsace - IRIMAS institute
Research
Imaging science and systems (High Dynamic Range & Spectral Filter Array Imaging) Publications
ENSISA, 12 rue des Frères Lumière - 68093 Mulhouse Cedex, France (map) Google Scholar
pierre-jean.lapray (at) uha.fr Curriculum Vitae
(paintings)

Research Highlights
 
1. High Dynamic Range Imaging

Standard cameras capture only a fraction of the information that is visible to the human eye. This is specifically true for natural scenes including areas of low and high illumination due to transitions between sunlit and shaded areas. When capturing such a scene, many cameras are unable to store the full Dynamic Range (DR) resulting in low quality images where details are concealed in shadows or washed out by sunlight. High Dynamic Range (HDR) imaging techniques appear as a solution to overcome this issue. Recent research programs on machine vision have clearly demonstrated the benefits of real-time HDR vision. Finally, medical applications require high precision images and HDR lighting techniques to improve the rendering quality of imaging systems.

More information AND Demonstrations here

Sensor board 1 (XGI connectors)
Sensor board 1
Sensor board 2
Sensor board 2
HDR camera prototype 1
HDR camera prototype 1
HDR camera prototype 2
HDR camera prototype 2
Low exposure
Low exposure time
Middle exposure
Middle exposure time
High exposure
High exposure time
HDR result
HDR result (tone mapped with Duan et al.)
False color representation of radiance values
False color representation of relative radiance values
   
   
2. Spectral Filter Array Imaging

Multispectral acquisition improves machine vision since it permits capturing more information on object surface properties than color imaging. The concept of spectral filter arrays has been developed recently and allows multispectral single shot acquisition with a compact camera design. Due to filter manufacturing difficulties, there was, up to recently, no system available for a large span of spectrum, i.e., visible and Near Infra-Red acquisition. This work presents the achievement of a prototype of camera that captures seven visible and one near infra-red bands on the same sensor chip. This opens a new range of applications in security, robotics, automotive and medical fields.

Multispectral Filter Array
Multispectral Filter Array principle
Camera design
Spectral characteristic of the filters
Camera design
Camera design (Zynq FPGA)
   
 
Journal Articles
     
2020 MSFA Courtier G., Lapray P.-J, Thomas J.-B., Farup I. (2020), Correlations in Joint Spectral and Polarization Imaging,  Sensors 2020, 21, 1. pdfpdf (10.9MB) bibtexbibtex
Supplemental document
link
       
MSFA Lapray P.-J. (2020), Exploiting redundancy in color-polarization filterarray images for dynamic range enhancement,  Optics Letters, Vol. 45, No. 19. pdfpdf (1.4MB) bibtexbibtex
Supplemental document
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MSFA Giménez Y., Lapray P.-J., Foulonneau A., Bigué L. (2020), Calibration algorithms for polarization filter array camera: survey and evaluation,  J. Electron. Imaging 29(4), 041011. pdfpdf (1.7MB) bibtexbibtex
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2018 PFA2018 Mihoubi S, Lapray P-J, and Bigué L (2018), Survey of Demosaicking Methods for Polarization Filter Array Images,  Sensors 2018, 18, 11. pdfpdf (5.5MB) bibtexbibtex
link
       
PFA Lapray P-J, Gendre L, Foulonneau A, and Bigué L (2018), An FPGA-based pipeline for micropolarizer array imaging,  J Circ Theor Appl. 2018;1–16. pdfpdf (1.4MB) bibtexbibtex
link
videos
       
2017 MSFA Lapray P-J, Thomas J-B, and Gouton P (2017), High Dynamic Range Spectral Imaging Pipeline For Multispectral Filter Array Cameras,  Sensors 2017, 17, 6. pdfpdf (16.4MB)
Supplementary materials
bibtexbibtex
link
       
Energy balance Lapray P-J, Thomas J-B, Gouton P, and Ruichek Y (2017), Energy balance in Spectral Filter Array camera design,  Journal of the European Optical Society-Rapid Publications, (2017) 13: 1. doi:10.1186/s41476-016-0031-7. pdfpdf (3.4MB)
Supplementary materials
bibtexbibtex
link
       
2016 MSFA Thomas J-B, Lapray P-J, Cédric C, and Gouton P (2016), Spectral Characterization of a Prototype SFA Camera for Joint Visible and NIR Acquisition,  Sensors 2016, 16, 993. pdfpdf (7.1MB)
Supplementary materials
bibtexbibtex
link
       
2014 MSFA Lapray P-J, Wang X, Thomas J-B, and Gouton P (2014), Multispectral Filter Arrays: Recent Advances and Practical Implementation,  Sensors, Vol. 14(11), pp. 21626. 10.3390/s141121626 pdfpdf (11.5MB)
bibtexbibtex
link
       
HDR-ARtiSt Lapray P-J, Heyrman B, and Ginhac D (2014), HDR-ARtiSt: an adaptive real-time smart camera for high dynamic range imaging Journal of Real-Time Image Processing, pp. 1-16. Springer Berlin Heidelberg. pdfpdf (2.1MB)
bibtexbibtex
link
       
HDR colour

Lapray P-J, Heyrman B, and Ginhac D (2014), Hardware-based smart camera for recovering high dynamic range video from multiple exposures, Optical Engineering, Vol. 53(10), pp. 102110.

pdfpdf (4.8MB)
bibtexbibtex
link
     
Peer Reviewed Conference Papers
2020 QCAV 2019 Sattar S, Lapray P-J, Foulonneau A, and Bigué L (2020), Review of spectral and polarization imaging systems,  Proc. SPIE 11351, Unconventional Optical Imaging II, 113511Q, Strasbourg, France. pdfpdf (0.4MB)
bibtexbibtex
link
       
2019 QCAV 2019 Giménez Y, Lapray P-J, Foulonneau A, and Bigué L (2019), Calibration for polarization filter array cameras: recent advances,  Fifteenth International Conference on Quality Control by Artificial Vision, 2019, Mulhouse, France. pdfpdf (0.5MB)
bibtexbibtex
link
       
2018 Photonics Europe 2018 Lapray P-J, Gendre L, Foulonneau A, and Bigué L (2018), A database of polarimetric and multispectral images in the visible and NIR regions,  In SPIE Photonics Europe. Strasbourg, France, April, 2018. pdfpdf (33.1MB)
posterposter (31.8MB) Supplementary materials
bibtexbibtex
link
       
2017 CERN Emery J, Barjau A, Dehning B, Alvarez J H, Lapray P-J, and Macchini M (2017), Design and Validation Methodology of the Control System for a Particle Beam Size Measurement Instrument at the CERN Laboratory,  2017 American Control Conference (ACC), 2017. pdfpdf (1.9MB) bibtexbibtex
link
       
scia2017 Thomas J-B, Lapray P-J, and Gouton P. (2017), HDR Imaging Pipeline for Spectral Filter Array Cameras, In: Sharma P., Bianchi F. (eds) Image Analysis. SCIA 2017. Lecture Notes in Computer Science, vol 10270. Springer, Cham.
pdfpdf (3.0MB)
bibtexbibtex
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icdsc2013 Lapray P-J, Thomas J-B, and Gouton P (2017), A Database of Spectral Filter Array Images that Combine Visible and NIR, Computational Color Imaging: 6th International Workshop, CCIW 2017, Milan, Italy, March 29-31, 2017, Proceedings.
pdfpdf (4.5MB)
Supplementary materials
bibtexbibtex
link
     
2016 Ghost removal Bouderbane M, Lapray P-J, Dubois J, Heyrman B, and Ginhac D (2016), Real-time ghost free HDR video stream generation using weight adaptation based method In Proceedings of the 10th International Conference on Distributed Smart Camera (ICDSC '16). . ACM, New York, NY, USA, 116-120.
pdfpdf (2.8MB)
bibtexbibtex
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Ghost removal Bouderbane M, Dubois J, Heyrman B, Lapray P-J, and Ginhac D (2016), Ghost removing for HDR real-time video stream generation Real-Time Image and Video Processing 2016, In Proc. SPIE. Vol. 9897, pp. 98970F-98970F-6.
pdfpdf (1.4MB)
bibtexbibtex
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2015 Ghost removal overview Bouderbane M, Lapray P-J, Dubois J, Heyrman B, and Ginhac D (2015), Overview of ghost correction for HDR video stream generation, In Proc. of ACM In 4th Workshop on the Architecture of Smart Cameras. pdfpdf (0.6MB)
bibtexbibtex
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Article 2015 Lapray P-J, Heyrman B, and Ginhac D (2015), High dynamic range adaptive real-time smart camera: an overview of the HDR-ARTiST project, Twelfth International Conference on Quality Control by Artificial Vision 2015, In Proc. SPIE. Vol. 9534, pp. 953417-953417-11. pdfpdf (2.3MB)
bibtexbibtex
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2014 multispectral_camera Lapray P-J, Thomas J-B, and Gouton P (2014-11-03T00:00:00), A Multispectral Acquisition System using MSFAs", Color and Imaging Conference. Vol. 2014(2014), pp. 97-102.
pdfpdf (1.4MB)
bibtexbibtex
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spie2014 Lapray P-J, Heyrman B, and Ginhac D (2014), HDR-ARtiSt: A 1280x1024-pixel Adaptive Real-time Smart camera for High Dynamic Range video, In SPIE Photonics Europe. Brussels, Belgium, April, 2014.
pdfpdf (1.8MB)
bibtexbibtex
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2013 icdsc2013 Lapray P-J, Heyrman B, and Ginhac D (2013), A 1.3 megapixel FPGA-based smart camera for High Dynamic Range real-time video, In Distributed Smart Cameras (ICDSC), 2013 ACM/IEEE International Conference on.
pdfpdf (0.9MB)
bibtexbibtex
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wasc2013 Lapray P-J, Heyrman B, and Ginhac D (2013), A smart camera for High Dynamic Range imaging, Second Workshop on Architecture of Smart Camera (WASC), Seville, Spain, 2013.
pdfpdf (2.4MB)
bibtexbibtex
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gretsi2013 Lapray P-J, Heyrman B, and Ginhac D (2013), HDR-ARtiSt : une caméra intelligente dédiée à la vidéo à grande dynamique en temps réel, 24ème colloque Gretsi, Brest : France, 2013.
pdfpdf (1.9MB)
bibtexbibtex
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2012 iscas2012 Lapray P-J, Heyrman B, Rosse M, and Ginhac D (2012), HDR-ARtiSt: High Dynamic Range Advanced Real-Time Imaging System, In Circuits and Systems (ISCAS), Proceedings of 2012 IEEE International Symposium on. Seoul, Corée, République De, May, 2012. , pp. 1428-1431.
pdfpdf (1.2MB)
bibtexbibtex
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scabot2012 Lapray P-J, Heyrman B, Rosse M, and Ginhac D (2012), High Dynamic Range Real-time Vision System for Robotic Applications, In IEEE Intelligent Robots and Systems (IROS). Villamoura, Portugal, October, 2012. , pp. 1-5.
pdfpdf (4.9MB)
bibtexbibtex
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scabot2012 Lapray P-J, Heyrman B, Rosse M, and Ginhac D (2012), Smart camera design for realtime High Dynamic Range imaging, First Workshop on Architecture of Smart Camera (WASC), Clermont ferrand : France, 2012.
pdfpdf (5.6MB)
bibtexbibtex
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2011 icdsc2011 Lapray P-J, Heyrman B, Rosse M, and Ginhac D (2011), Smart camera design for realtime high dynamic range imaging, In Distributed Smart Cameras (ICDSC), 2011 Fifth ACM/IEEE International Conference on. Belgique, August, 2011. , pp. 1-7.
pdfpdf (2.4MB)
bibtexbibtex
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Short course
       
2017 Short course Thomas J-B, Monno Y, and Lapray P-J (2017). Spectral Filter Arrays Technology, Color and Imaging Conference, 25th Color and Imaging Conference, Society for Imaging Science and Technology, Sep 2017, Lillehammer, Norway. pdfpdf (12.2MB) bibtexbibtex
link
       
Ph.D. Thesis
       
2013 PhD Dissertation Lapray P-J (2013). New generation of high dynamic range vision systems, Thesis at: Université de Bourgogne, October, 2013 (2013DIJOS032). pdfpdf (76.9MB)
       
Invited Talks
       
2015 cern Lapray P-J (2015). New generation of real-time high dynamic range vision systems, Talk given at:
CERN, October 13, 2015, Geneva, Switzerland
pdfpdf(4.5MB)
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