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1 © MTA - SZTAKI — IKTA-3-044/2000
ARCHIVE FILMARCHIVE FILMRECOVERY RECOVERY
SYSTEMSYSTEM
© MTA - SZTAKI — IKTA-3-044/20002
ProblemProblem
• 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
SolutionSolution
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 SystemArchive Film Recovery System
© MTA - SZTAKI — IKTA-3-044/20005
Technical parametersTechnical parameters
• film types 35mm 4 p/f FF with voice 1:0.83• optical resolution 100 lp/mm• max shrinkage 4 %• max trembling 10 µm• voice sampling frequency 20 kHz• speed 1
frame/sec• least roller radius 40 mm• maximum pulling force 2 N• maximum missing perforations 25• max missing perf. on both sides 7• maximum film temperature 23 ± 1 °C• roll sizes 300 m
© MTA - SZTAKI — IKTA-3-044/20006
Key FeaturesKey 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 EquipmentOperation of the Equipment
• Advancing the frame
• Fine positioning
• Lighting control
• Digital storage for sound
• System Control
© MTA - SZTAKI — IKTA-3-044/20008
Advancing a frameAdvancing 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 rollersDrive using vacuum rollers
© MTA - SZTAKI — IKTA-3-044/200010
Gentle Film HandlingGentle Film Handling
•Large radius rollers
•Controlled film tension
•Air-cushion gate
Gate
Vacuum rollers
© MTA - SZTAKI — IKTA-3-044/200011
Fine PositioningFine Positioning
• Problem– Frame position is mechanically determined
by perforation
• Solution– Perforation sensing by CCD cameras– Fine positioning by moving the lens
© MTA - SZTAKI — IKTA-3-044/200012
Fine PositioningFine Positioning
1. Gate2. CCD cameras3. Moving lens4. Light sensor5. Light source
1.
2.
3.
4.
5.
© MTA - SZTAKI — IKTA-3-044/200013
Sensors For Detecting PerforationSensors For Detecting Perforation
© MTA - SZTAKI — IKTA-3-044/200014
Fine Positioning by Moving LensFine 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-3-044/200015
Moving LensMoving Lens
© MTA - SZTAKI — IKTA-3-044/200016
Lighting ControlLighting 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-3-044/200017
Lighting ControlLighting 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-3-044/200018
Digital storage for soundDigital 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-3-044/200019
Digital storage of the soundtrack imageDigital storage of the soundtrack image
Film
Position sensor
Lighting
Film transport
Lens
Camera
Light path
Computer
© MTA - SZTAKI — IKTA-3-044/200020
Digital storage of the soundtrack imageDigital storage of the soundtrack image
© MTA - SZTAKI — IKTA-3-044/200021
System controlSystem control
•Central control unit
•Motion controllers
•Image processors
•Lighting control
•Sound control
© MTA - SZTAKI — IKTA-3-044/200022
Further InformationFurther Information
• Sándor [email protected]
• Iván [email protected]
• Frigyes [email protected]
Computer and Automation Research Institute,Hungarian Academy of Sciences,Budapest, Hungary (MTA - SZTAKI)