Tag Archives: Share Academy

3D Scanning moves into its final phase

Over the last fortnight we have been undertaking the latest stages of scanning of our 3D philatelic objects as part of our Share Academy funded project – from vault to view.

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Scanning the flintlock pistol.

We took a number of dies, including the Old Original die of the Penny Black, and the Silver Wyon Medal, over to UCL to be photographed in a PTM dome. The dome is opaque and is fitted with 84 flash lights arranged in rings around the hemisphere. Each flash is activated one at a time and a photograph taken. Once all 84 flashes have been triggered the resulting 84 photographs are processed together into one image so that all the lighting conditions can be observed via a special viewing computer program. The observer can manipulate the lighting condition to reveal hidden features – the engraving, the scratches on a die, etc

The activity described above is part of a series of techniques for a process known as Reflective Transformation Imaging (RTI). You can find out more here – http://culturalheritageimaging.org/Technologies/RTI/

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Scanning at UCL

The results of this test are still being processed, but the images we’ve seen so far are impressive and we’re very excited by them.

Last week UCL’s 3D specialist, Mona Hess, visited the BPMA bringing a portable 3D laser scanner with her. This was to be the last set of trials with laser scanning and we wanted to try the same set of objects which were digitised by the PTM dome. This time around, the results were more mixed as the laser had difficulty with the shiny surfaces of the dies and medal. We also tried scanning the flintlock pistol we had scanned previously with the large laser scanner at UCL and the results were slightly better. The scanner rendered the wooden parts of the handle and stock, but struggled to render the metallic parts, such as the barrel and the firing mechanism.

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Latest tests at the BPMA

The preliminary findings of the tests show that the PTM dome renders the most useful images of metallic objects from the stamp printing process. We have one day of scanning left to complete in this fascinating project and we will then make the results of the whole project publicly available.

Stamp printing plates, dies and rollers: from vault to view

Over the next year, our Philatelic and Digital teams will be working with UCL’s Mona Hess, Research Associate and PhD candidate at UCL, to digitise objects from our collections, including printing dies, rollers and plates. These objects are difficult to photograph and not available for consultation by the public. This project, funded by Share Academy, will provide access to these important objects through a combination of a number of technologies. The final output will be set of 3D digital objects for use by philatelic enthusiasts, researchers and the general public. This blog will regularly update you on what is happening along the way.

Mona discusses various imaging techniques and engagement outputs for the 3D objects. A stamp plate sits at the centre of the table.

Mona discusses various imaging techniques and engagement outputs for the 3D objects. A stamp plate sits at the centre of the table.

Last Friday (24 January), we held a kick-off meeting for our Philatelic 3D digitisation project, a Share Academy project partnership with UCL. Because of the highly-reflective surfaces of these objects, a combination of technologies will be trialled to see which works best.  Some of the objects can be captured at the BPMA’s premises using techniques such as photogrammetry. Others, however, may need to be transported to UCL to be digitised with their large-format 3D scanning device.

Original Heath die of Penny Black with various other dies. (POST 118/1733)

Original Heath die of Penny Black (centre) with various other dies. (POST 118/1733). The reflective and finely-engraved surface makes them difficult to photograph.

Another highlight of the meeting was the demonstration of a possible output for the 3D objects: a mobile/tablet application. The Petrie Museum engages visitors using an application that explores the history of the Nile Valley with 3D digitised objects that can be manipulated by users.

Over the next month, our Philatelic team will be selecting various objects to be captured in the trials (due to take place from March), as well as planning any transportation of objects, where necessary, to UCL.

Are there any particular objects in the Philatelic collection that you want to see as 3D objects? 

-Rachel Kasbohm, Digital Media Manager