ARCHIVE FILM RECOVERY SYSTEM. © MTA - SZTAKI — IKTA-3-044/20002 Problem Huge quantity of decaying shrunken rolls of film, they will be completely useless.

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Presentation transcript:

ARCHIVE FILM RECOVERY SYSTEM

© MTA - SZTAKI — IKTA-3-044/20002 Problem Huge quantity of decaying shrunken rolls of film, they will be completely useless within some years Traditional film copiers are not able to making safety copies Today’s digital solutions are not (yet) mature enough for long-term archiving

© MTA - SZTAKI — IKTA-3-044/20003 Solution The Archive Film Recovery System is capable of copying shrunken films that are generally in bad condition onto a safety film.

© MTA - SZTAKI — IKTA-3-044/20004 Archive Film Recovery System

© MTA - SZTAKI — IKTA-3-044/20005 Technical parameters film types35mm 4 p/f FF with voice 1:0.83 optical resolution100 lp/mm max shrinkage4 % max trembling10 µm voice sampling frequency20 kHz speed1 frame/sec least roller radius40 mm maximum pulling force2 N maximum missing perforations25 max missing perf. on both sides7 maximum film temperature23 ± 1 °C roll sizes300 m

© MTA - SZTAKI — IKTA-3-044/20006 Key Features Film transported without sprockets Position evaluated using optical detection Position correction by means moving the lens Analogue saving of picture information Digital saving of sound information

© MTA - SZTAKI — IKTA-3-044/20007 Operation of the Equipment Advancing the frame Fine positioning Lighting control Digital storage for sound System Control

© MTA - SZTAKI — IKTA-3-044/20008 Advancing a frame Film is not sprocket driven Problem –The damaged films cannot be sprocket driven Solution –Drive using vacuum rollers –Movement sensing by perforation detection –Gentle film handling (large radius rollers)

© MTA - SZTAKI — IKTA-3-044/20009 Drive using vacuum rollers

© MTA - SZTAKI — IKTA-3-044/ Gentle Film Handling Large radius rollers Controlled film tension Air-cushion gate Gate Vacuum rollers

© MTA - SZTAKI — IKTA-3-044/ Fine Positioning Problem –Frame position is mechanically determined by perforation Solution –Perforation sensing by CCD cameras –Fine positioning by moving the lens

© MTA - SZTAKI — IKTA-3-044/ Fine Positioning 1. Gate 2. CCD cameras 3. Moving lens 4. Light sensor 5. Light source

© MTA - SZTAKI — IKTA-3-044/ Sensors For Detecting Perforation

© MTA - SZTAKI — IKTA-3-044/ Fine Positioning by Moving Lens Lens moving by stepping motors Step length: 2 µm Control by the sensor system Position checked after each step

© MTA - SZTAKI — IKTA-3-044/ Moving Lens

© MTA - SZTAKI — IKTA-3-044/ Lighting Control Problem –Traditional lighting is non-uniform –Archive films need correction (corners are darker) Solution –Sensing of light intensity –Controlled light source

© MTA - SZTAKI — IKTA-3-044/ Lighting Control Correcting non-uniformity of lighting by computer Light source LCD Light sensor Computer SW Test setup Iterative algorithm Intensity fine tuning in 50 steps 10 bit resolution on four pixels for every color

© MTA - SZTAKI — IKTA-3-044/ Digital storage for sound Storage of sound information: –Digital storage of the soundtrack image –Graphical filtering –Converting the image to sound information –Digital sound file

© MTA - SZTAKI — IKTA-3-044/ Digital storage of the soundtrack image Film Position sensor Lighting Film transport Lens Camera Light path Computer

© MTA - SZTAKI — IKTA-3-044/ Digital storage of the soundtrack image

© MTA - SZTAKI — IKTA-3-044/ System control Central control unit Motion controllers Image processors Lighting control Sound control

© MTA - SZTAKI — IKTA-3-044/ Further Information Sándor Manno Iván Kas Frigyes Bisztray Computer and Automation Research Institute, Hungarian Academy of Sciences, Budapest, Hungary (MTA - SZTAKI)