Mr. Francois Helt Profile

Francois Helt

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Publications (3)

Proceedings Article | 17 January 2006 Paper

Further image quality assessment in digital film restoration

M. Chambah, C. Saint-Jean, F. Helt, A. Rizzi

Proceedings Volume 6059, 60590S (2006) https://doi.org/10.1117/12.642414

KEYWORDS: Image quality, Video, Image processing, Cameras, Visualization, Quality measurement, Digital imaging, Statistical analysis, Quantization, Printing

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Proceedings Article | 17 January 2005 Paper

Image quality evaluation in the field of digital film restoration

M. Chambah, C. Saint-Jean, F. Helt

Proceedings Volume 5668, (2005) https://doi.org/10.1117/12.586738

KEYWORDS: Image quality, Image processing, Video, Digital image processing, Video compression, Colorimetry, Image compression, Principal component analysis, Quality measurement, Visualization

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Proceedings Article | 12 August 1992 Paper

High-definition tape-to-film transfer

Francois Helt

Proceedings Volume 1656, (1992) https://doi.org/10.1117/12.135940

KEYWORDS: Video, Image processing, Image filtering, Digital video recorders, Computing systems, Sensors, Printing, Image resolution, Standards development, Video processing

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With the collaboration of Thomson Broadcast Ex Machina has developed a full digital tape-to-film transfer process. This system accepts as input any European Analog or Digital formats: 1 inch B. T. S. 4xDl. . . It is based on a fully computerized image processing and is fully automated from the loading of the Dl tapes to the 35mm negative output. This process includes spatial and temporal filtering to get full scan 35 mmimage quality. As the input format is 50 fields per second (non-square pixels) and the output format is 24 frames per second (square pixels) the key point was to obtain a good spatial resolution without dynamic artefacts like excessive blur moving images or patterns at vertical edges. Steps of the process are as follows: - Digital copy on four 4:2:2 tapes as necessary - Transfer on computer network - Adaptive filtering by software - Gamma correction and output on 35mmfilm recorder. The processing speed has been improved by controlling four processes in parallel. High Definition tape to film transfer is available right now. The transfer capacity is 30 minutes per week since the end of last year. 1 - PRESENTATION OF THE PROJECT With the collaboration of THOMSON Broadcast Ex Machina has developed a fully digital High Definition tape-to-film transfer process. This sytem is designed to permit transfer on 35mm film of productions made with the European High Definition Standard. As a computer graphics production company Ex Machina has been producing sequences on various media including digital video high definition video 35 mm film and has finished recently a 3 mn film on 70 mm IMAX format. Two ongoing projects use this same standard with one having been designed for stereoscopic projection. Building on this expertise Ex Machina proposed to realize a tape to film transfer system for the European Economic Interest Grouping (EIIG) Vision 1250 in co-operation with another european organisation Eureka 95. For the development of such a system the company proposed to use commercialy available equipment with no custom hardware and to write the software needed for mastering the whole process. This approach offers numerous advantages: - it is fast in terms of both development and operational build-up - it is flexible as both software and equipment may evolve - itis less costly considering the time and effort needed. 124 I SPIE Vol. 1656 High-Resolution Sensors and Hybrid Systems (1992) 0-8194-081 0-71921$4. 00

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