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 MannoManno@sztaki.hu

• Iván KasKas@sztaki.hu

• Frigyes BisztrayBisztray@sztaki.hu

Computer and Automation Research Institute,Hungarian Academy of Sciences,Budapest, Hungary (MTA - SZTAKI)