Master theses and semester projects

Bachelor Project (CS)

Cultural evolution can be modelled as an ensemble of ideas, and conventions, that spread from one mind to another. This is referred to as memes, elementary replicators of culture inspired by the concept of a gene. A meme can be a tune, a catch-phrase, or an architectural detail, for instance. If we take the example of maps, a meme can be expressed in the choice of a certain texture, a colour, or a symbol, to represent the environment. Thus, memes spread from one cartographer to another, through time and space, and can be used to study cultural evolution. With the help of computer vision, it is now possible to track those memes, by finding replicated visual elements through large datasets of digitised historical maps.

By extracting visual elements from tens of thousands of maps and embedding these elements in a feature space, it becomes possible to estimate which elements correspond to the same replicated visual idea, or meme. This opens up new ways to understand how ideas and technologies spread across time and space.

Despite the immense potential that such data holds for better understanding cultural evolution, it remains difficult to interpret, since it involves tens of thousands memes, corresponding to millions of visual elements. Somewhat like genomics research, it is now becoming essential to develop a microscope to observe memetic interactions more closely.

In this project, the student will tackle the challenge of designing and building a prototype interface for the exploration of the memes on the basis of replicated visual elements. The scientific challenge is to create a design that reflects the layered and interconnected nature of the data, composed of visual elements, maps, and larger sets. The student will develop its project by working with digital embeddings of replicated visual elements, and digitised images in IIIF framework. The interface will make use of the metadata to visualise how time, space, as well as the development of new technologies influence cartographic figuration, by filtering the visual elements. Finally, to reflect the multi-layered nature of the data, the design must be transparent and provide the ability to switch between visual elements and their original maps.

The project will draw on an exceptional dataset of tens of thousands of American, French, German, Dutch, and Swiss maps published between 1500 and 1950. Depending on the student’s interests, an interesting case study to demonstrate the benefits of the interface could be to investigate the impact of the invention of lithography, a revolutionary technology from the end of the 18th century, on the development of modern cartographic representations

Semester project (Master, CS)

From 1812 onwards, land mapping campaigns were launched throughout Europe on the model of the so-called “Napoleonic” and later “renovated” cadastre. These maps covered the largest part of Western Europe, from Spain to the Netherlands, including Italy, the Austro-Hungarian Empire and the Confederation of the Rhine (Germany). The Napoleonic cadastre is thus one of the main historical sources of the 19th century and the hundreds of thousands of sheets that compose it are largely digitized. Georeferencing, i.e. spatial recalibration of the cadastral sheets, would constitute a fantastic added value for urban planning and environmental sciences by allowing large-scale studies on two centuries of territorial evolution. Within the framework of this project, the student will develop automatic methods based on computer vision techniques and graph neural networks to automate the realignment of cadastral sheets.

Master thesis (Unil, DH)

The Polier notebooks are a set of handwritten documents written by Jean-Henri Polier de Vernand (1715-1791), lieutenant baillival of Lausanne, under the title Livre de Raison, soit Memorial Universel. These notebooks, which total nearly 26,300 pages written between 1754 and 1791, are a precise account of the daily life of the time and of the micro-history of Lausanne. They contain a great deal of information about the economic and social history and details of daily life, such as trade or meteorology. The project aims at automatically transcribing the Polier notebooks using state-of-the-art automatic handwriting recognition (HTR) methods in order to finally unravel the mysteries of these pages. In a second step, an investigation based on distant reading and natural language processing (NLP) technologies will allow to deepen a research question on the themes of environmental, social, or economic history.

Master thesis (DH) + Semester project (Bachelor, Maths)

The Bibliothèque Historique de la Ville de Paris digitised more than 700 maps covering in detail the evolution of the city from 1836 (plan Jacoubet) to 1900, including the famous Atlases. They are of a particular interest in the urban studies of Paris, which was at the time heavily transfigured by Haussmanian transformations. For administrative and political reasons, the City of Paris did not benefit from the large cadastration campaigns that occurred throughout Napoleonic Europe at the beginning of the 19th century. Therefore the Atlas’s sheets are the finest source of information available on the city over the 19th century. In order to make use of the great potential of this dataset, the information contained in the maps must be converted from its visual representation to an abstract, geometrical, form, on which to base quantitative studies. This conversion from an input raster to an output vector geometry is typically well-performed by combining Convolutional Neural Networks for pixelwise classification to standard computer vision techniques. In a second time, the student will develop quantitative techniques to investigate the transformation of the urban fabric.

Semester project (Master, CS)

At the end of the 19th century, a global will for administrative reform brought about the need to renovate the old cadastres dating from the Napoleonic era. Cadastral campaigns of cities and territories were launched by applying the best technologies of the time. The canton of Vaud took part in the movement and published in 1888 the renovated cadastre of Lausanne, a collection of more than 300 plates of high graphic quality and remarkable accuracy. It includes a complete legend that includes the use of each parcel (house, café, bakery, field, vineyard, etc.) and the owner. The automatic vectorization project aims to use state-of-the-art technologies developed in the framework of the Time Machine initiative to transform the historical images into vector maps using CNN-based semantic segmentation. For the legend, automatic document processing and handwritten text recognition (HTR) methods could also be deployed. This work would pave the way to a better understanding of a key period of Lausanne’s history that saw the birth of the city we know today. The vectorization of the document will also open new avenues of investigation for the student to explore the palimpsest of Lausanne’s history.

Semester project (Master, CS)

The Historical Museum of Lausanne has a collection of more than 38’500 digitized images, including numerous shots of Lausanne and photographs of buildings. These archives are the keystone of the historical reconstruction of the city because they constitute a direct trace of the light of the past. In this project, the student will develop automatic methods based on photogrammetry and neural networks to match the images and infer the angle and position of the photographic shot. This work will open the possibility of directly reprojecting historical photographs onto 4D models.