Heritage Imaging Technology



Digital Restoration

Recently, diverse digital techniques based on 3D data, along with visual analysis, have been used to restore the estimated prototypes of relics, boosting their aesthetic and academic value, and greatly assisting with the identification of their production techniques. These data are used to review relics before conservation treatment and restoration.

Digital Restoration Process

1. Precision 3D Scanning

The target relic's characteristics are identified and a 3D scanner suitable for examining such characteristics is selected before scanning it closely and thoroughly. This process produces an abundance of data, which are used in the work of completing the forms of the relics.

image Precision 3D scanning
image Arrangement of acquired data

2. Completion of 3D Forms

3D image data are combined and matched with each other to make a complete 3D image. An image is completed by dotting three or more identical points in the duplicated section when combining data.

image 3-point combination
image Completion of 3D forms

3. Survey of Data

Before restoring images, using 2D photos and X-ray and CT images, not only the target relic's surface but also its interior should be observed, and various evidential historical data should be surveyed as reference data.

image Observation of a connected area and a sketch of a restored form
image CT images - connection of central members and their characteristics

4. Dismantling by Member

The majority of relics are either damaged and lost or transformed in some way. As such, a part that is close to a prototype should be selected, and the relic should be dismantled by member before modeling each one.

image Dismantling by member
image Modeling of open-work decorative design

5. Correction of Transformed Forms

Based on modeled members, the transformed form is corrected.

image Difference between the corrected body and the existing member’s location
image Correction of detached band decoration- Attachment to the body

6. Completion

Compare and examine the scanned data and the restored data and confirm the revised details before conducting the final examination

image Comparison with original data
image Final completion

7. Videos
Gilt-bronze Cap from the Andong Ancient Tomb to Goheung
Memorial Monument of the Cemetery of the Seven Hundred Righteous Warriors

CT

Computer tomography (CT) is an inspection method by which the same x-ray equipment principle is used, radiation is injected from a high-pressure x-ray tube into the target relic, a 3D image isreconstructed, and its internal form, defects, and so on are analyzed.

View data

Non-Destructive Survey of Cultural Heritages Using CT
  • Model: SEC X-EYE PCT
  • Tube voltage: Max. 225kV
  • Tube current: Max. 3mA
  • Max. power: 300W
image
CT Image Diagram

presision 3D scanning

Photographing of Images
Set the shooting conditions
begin ro scan projected images with X-ray equipment
Re-composition of images
Transmit the projected Images to the CT workstation, and, based on the recomposed image
Calculate the detector offset
Then recompose the whole image based on the calculated detector offset
Analysis of images
Transmit the Recomposed images to the Software Program
Analysis with software program
Completion of mimetic diagram

Characteristics of CT
  • CT is conducted by shooting, recomposing, and analyzing images in that order.
  • Shooting images: While the relic rotates by 360°, certain X-rays continue to be released to scan the images.
  • Recomposing images: Transmit the scanned image files to the CT workstation to recompose them.
  • Analyzing images: Use the CT-eye3D software and transform the recomposed images into 3D images to analyze information.
image Internal CT structure
image Principle of shooting

Examples of Non-destructive Survey Using CT

Goheung Gilt-bronze Decorative Shoes of Andong

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Decorative shoes from the Andong ancient tomb in Goheung (Left: X-ray, center: photo, right: CT image)


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Diverse CT images of decorative shoes from the Ancient Andong Tomb


Bamboo tobacco pipe unearthed from Sungnyemun (Bronze)

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Diverse CT images of the bamboo tobacco pipe unearthed from Sungnyemun


Fabrics collected from a sarira reliquary bronze bowl, Mireuksa Temple Site (Fabric)

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Diverse CT images of fabrics from a bronze bowl, Mireuksa Temple Site


Treasure No. 326, Jade Furnace, Hyenchungsa Temple

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Multiangle Filimg of the Jade Furnace, Hyeonchungsa Temple


Video

Gilt-bronze shoes of Andong in Goheung
Door lock for Gyeongbokgung Palace

Banner

Asia Cooperation Program on Conservation Science Cultural Heritage Administration of Korea National Palace Museum of Korea Korea National Commission for UNESCO