As I write this article, a box full of 8mm film has just been delivered to our studio. On these tapes is local home footage featuring carnival celebrations from the 1960s, a visit by the UK’s Queen Elizabeth II, and an assorted series of family events recorded around the Maltese Islands. These films are valuable historical records opening a window onto the unfiltered and uncensored perspective of Maltese citizens. Magna Żmien is a Valletta 2018 project coordinated by artistic director Andrew Alamango and a collective of like-minded individuals. The purpose of the project is to collect and preserve historic Maltese content recorded on home sound, image, and video equipment over the past century. Left neglected, these personal documents containing evidence of Malta’s changing landscapes—physical, social, and political—might have been lost and forgotten. Instead, the team is reusing them, reinterpreting them through art.
Armchair Voyager Wistin (Jacob Piccinino)
The move to digitise and make available fading analogue memories is physically manifested through ‘The Magnificent Memory Machine’—the Kapsula Merill, designed and built by Matthew Pandolfino, Andre Vujicic and Late Interactive. In the driver’s seat is Armchair Voyager Wistin (Jacob Piccinino). Behind the scenes is the professional studio that makes it all happen, digitising open reel tapes, audio cassettes, vinyl, Super 8 and 8mm film, photographs, negatives, and slides at high resolution. Since February 2018, we have digitised over 2,000 items from 51 different donors, in addition to receiving a further 600 digital files from private collections.
An eager viewer going back in time!
The collected material has many stories to tell. Our performance events throughout 2018, including at Science and the City and Malta Café Scientifique, only scratch the surface when it comes to the sheer volume of material we have been allowed to copy by donors.
One thing we often encounter is the personal voice message—greetings between diasporic Maltese. Dating back to the 1950s, these appear most frequently on open reel and audio cassette tape, but also on special vinyl discs. One particular recording is by a man named Charlie who recorded his message in a Calibre booth on a platform at London Waterloo station. In the message, Charlie sends wishes to his family and regales them with tales of all the football matches he is attending, one of which he is particularly excited about: England vs East Germany. Some minor detective work has revealed that this recording was made on 24 November 1970 when England beat East Germany three goals to one.
Messages such as these may seem inconsequential, but of all the voice recordings we have heard, they are perhaps among the most honest. Recorded in a busy, alien environment under strict time constraints, the speakers didn’t have the luxury of retakes before their voices were forever fixed on vinyl.
Magna Żmien will continue to collect sounds, images, and videos like these, and present its research in innovative contexts beyond 2018. We want to continue engaging citizens in the technical and cultural components at the heart of our project. Agreements are also underway to establish a formal association between Magna Żmien and the National Archives, ensuring the longevity of this material as public documents are accessible to all. What we collect, after all, belongs to the Maltese people at home and abroad. The recordings contain an essence of our national identity that cannot and should not be lost.
For more, visit: www.magnazmien.com
Author: Andrew Pace for the Valletta 2018 Foundation
Comfortably sitting in seat 3F, John is watching one of his favourite operas. This close he can see all the details of the set, costumes, and the movements of the music director as he skilfully conducts the orchestra by careful gestures of his baton. He is immersed in the scene, capturing all the details. Then all of a sudden, the doorbell rings. Annoyed, John has to stop the video to see who it is. This could be the mainstream TV experience of the future.
This scene is called free-viewpoint technology that is part of my research at the University of Malta (UoM). Free-viewpoint television allows the user to select a view from which to watch the scene projected on a 3D television. The technology will allow the audience to change their viewpoint when they want, to where they want to be. By moving a slider or by a hand gesture, the user can change perspective, which is an experience currently used in games with their synthetically generated content — synthetically generated by a computer game’s graphics engine.
“For free-viewpoint to work, a scene needs to be captured using many cameras”
Today we are used to seeing a single viewpoint. If there are multiple perspectives we usually don’t have any control over them. Free-viewpoint technology will turn this idea on top of its head. The technology is expected to hit the market in the near future, with some companies and universities already experimenting with content and displays. New auto-stereoscopic displays do not need glasses (pictured next page), these displays ‘automatically’ generate a 3D image depending on which angle you view them. A clear example was the promise made by Japan to deliver 3D free-viewpoint coverage of all football games as part of their bid to host the FIFA World Cup in 2022. The bid was unsuccessful, which might delay the technology by a few years.
Locally, my research (and that of my team) deals with the transmission side of the story (pictured). For free-viewpoint to work, a scene needs to be captured using many cameras. The more cameras there are, the more freedom the user has to select the desired view. So many cameras create a lot of data. All the data captured by the cameras has to be transmitted to a 3D device into people’s homes, smartphones, laptops and so on. This transmission needs to pass over a channel, and whether it is fibre cable or wireless, it will always have a limited capacity. Data transmission also costs money. High costs would keep the technology out of our devices for decades.
My job is to make a large amount of data fit in smaller packages. To fit video in a channel we need to compress it. Current transmission of single view video also uses compression to save space on the channel so that more data can be transmitted and save on price. Note that, for example for high definition we have 24 bits per pixel and an image contains 1280 by 720 pixels (720p HD standard), that’s nearly 100,000 pixels for every frame. Since video is around 24-30 frames per second the amount of data being transmitted every minute starts escalating to unfeasible amounts.
Popupology – double 3d / 3d squared my first attempt at an anaglyph photo of a paper structure. you will need those red/blue glasses to view it properly.
Free-viewpoint technology would be another big leap in size. Each camera would be sending their own video, which is the same amount of data as we are now getting. If there are ten cameras, you would need to increase channel size by a factor of ten. This makes it highly expensive and unfeasible. For the example above, the network operator needs ten times more space on the network to get the service to your house, making it ten times more expensive than single view. Therefore, research is needed to drastically reduce the amount of data that needs to be transmitted while still keeping high quality images. These advances will make the technology feasible, cheaper, and available for all.
So the golden question is, how are we going to do that? Research, research, and more research. The first attempts by the video research community to solve this problem were to use its vast knowledge of single view transmission and extend it to the new paradigm. Basic single view algorithms (an algorithm is computer code that can perform a specific function, like Google’s search engine) compress video by searching through the picture and finding similarities in space and in time. Then the algorithms send the change, or the error vector, instead of the actual data. The error vector is a measure of imperfections and how it is used by computer scientists to compress data is explained below.
First let us look at the space component. When looking at a picture, it is quite clear that some areas are very similar. The similar areas can be linked and the data grouped together into one reference point. The reference point has to be transmitted with a mathematical representation (vector) that explains to the computer which areas are similar to each other. This reduces the amount of data that needs to be sent.
Secondly, let us analyse the time aspect. Video is a set of images placed one after another and run at 25 or 30 frames per second that gives the illusion of movement and action. To make a video flow seamlessly images that are right after each other are very similar. If we have two images the second one will be very similar to the first, with only a small movement of some parts of the image. Like we do for space, a mathematical relationship can be calculated for the similar areas from one image to the next. The first image can be used as a reference point and for the second we transmit only the vector that explains which pixels have moved and by how much. This greatly reduces the data that needs to be transmitted.
The above techniques are used in single view transmission, with free-viewpoint technology we have a new dimension. We also need to include the space between cameras shooting the same scene. Since the scene is the same there is a lot of similarity between the videos of each camera. The main difference is that of angle and the problem that some objects might be visible from one camera and not from another. Keeping this in mind, a mathematical equation can be constructed that explains which parts of the scene are the same and which are new. A single camera’s video is used as a reference point while its neighbouring cameras only transmit the ‘extra’ information. The other camera can compress their content drastically. In this way the current standard can be extended to free-viewpoint TV.
Compressing free-viewpoint transmissions is complex work. Its complexity is a drawback, mobile devices simply aren’t fast enough to run computer power intensive algorithms. Our research focuses on reducing the complexity of the algorithms. We modify them so that they are faster to run, need less computing power, and still keep the same quality of video, or with minimal losses.
“The road ahead is steep and a lot of work is needed to bring this technology to homes”
We have also explored new ways of reconstructing high quality 3D views in minimum time, using graphical processing units (GPUs). GPUs are commonly used by high-end video games. Video must be reconstructed with a speed of at least 25 pictures per second. This speed must be maintained if we want to build a smooth continuous video in between two real camera positions (picture). A single computer process cannot handle algrothims that can achieve this feat; instead parallel processing (multiple simultaneous computations) is essential. To remove the strain off a main processing unit in a computer processing can be offloaded to a GPU. Algorithms need to be built that use these alternative processing powers. Ours show that we can obtain the necessary speeds to process free-viewpoint 3D video even on mobile devices.
The autostereoscopic display techinique without glasses. Depending on the position of the viewer, the filter directs the left image to the left eye and the right image to the right eye.
Since free-viewpoint takes up a large bandwidth on networks, we researched whether these systems can feasibly handle so much data. We considered the use of next generation mobile telephony networks (4G). Naturally they offer more channel space, we wanted to see how many users they can handle at different screen resolutions. We showed that the technology can be used only using a limited number of cameras. The number of users is directly related to the resolution used, with a lower resolution needing less data and allowing more views or users. This research came up with design solutions for the network’s architecture and broadcasting techniques needed to minimise delays.
The road ahead is steep and a lot of work is needed to bring this technology to homes. My vision is that in the near future we will be consuming 3D content and free-viewpoint technology in a seamless and immersive way in our homes and mobile devices. So for now sit back and imagine what watching an opera or football match on TV would look like in a few years’ time.
