Systems evaluation for computer graphics rendering of the total appearance of paintings

One of the challenges when imaging paintings is recording total appearance, that is, the object\u27s color, surface microstructure (gloss), and surface macrostructure (topography). In this thesis, various systems were used to achieve this task, and a psychophysical paired comparison experiment was conducted to evaluate their performance. A pair of strobe lights arranged at 60° from the normal on either side of the painting captured color information where the strobes produced either directional or diffuse illumination geometry. By adding a third strobe, arranging them 120° apart annularly, and cross polarizing, diffuse color and surface normal maps were measured. A fourth strobe was added and the four lights were rearranged 90° apart annularly, capturing similar data. This system was augmented by two scanning linear light sources arranged perpendicularly, facilitating the measurement of spatially varying BRDF and specular maps. A laser scanner was used to capture surface macrostructure and was combined with the diffuse color maps from the four-light configuration. Finally, a dome illumination system was used with software developed by Conservation Heritage Imaging to produce color maps. In all, eight different configurations were achieved and used to image three small paintings with a range of appearance attributes. Twenty-five naive observers compared computer-graphic renderings to the actual painting and judged similarity in terms of total appearance, gloss/shininess, texture, and color. Although the rankings varied with painting, two general trends emerged. First, the four-light configuration with or without the independent laser scanning produced images visually equivalent to conventional strobe illumination. Second, diffuse illumination was always ranked lowest

Color Photographs

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Optical Transmissions

Artist Statement My art is deeply rooted in graphic design. Along the way I have experimented in block printing, screen printing, and painting. I use highly saturated colors and patterns to create optical illusions. One major influence on my work is the Op Art movement from the 1960s. From Op Art I take the ideas of how color and shape can work together to create visual effects. Music is another influence on my work. I try to create rhythms and the illusion of pulsating beats, visually. I want there to be a sensation of movement within the work where some parts of the artwork appear to advance and other parts to recede. My goal in art is to evoke a sense of visual excitement in the viewer through the use of color, shape, and pattern

The Life and Work of George Dombek

George Dombek is an accomplished artist who graduated from the University of Arkansas with degrees in Architecture and Painting. His career as both professor and painter has taken him around the world and produced a substantial body of work. This work seeks to examine his art in a larger art historical context and consider the development of the subjects and style of his paintings over the span of his career

Figure and Environment

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The world on a plate: the impact of photography on travel imagery and its dissemination in Britain, 1839-1888

This thesis explores how early photography contributed to the visual understanding of the world in the nineteenth century. It draws extensively on the collection of nineteenth-century photographic albums at the National Maritime Museum, London. These albums, compiled or purchased by officers in the Royal Navy, offer an extensive view of how the world was perceived by both the officers who collected photographs during overseas service and the photographers who competed to supply them. Chapter 1 considers two personal photographic albums compiled by naval officers Frederick North and Tynte F. Hammill. Through these it reveals the agency of the collector as a curator of their own world picture, and introduces wider currents visible across the archive. Chapter 2 explores the impact of photography on the visual representation of the Crimean War and the competitive market for travel imagery in Britain. Chapters 3 and 4 explore the work of photographer Felice Beato, the studio albums he created in Japan and Korea, and the role of the British navy and military in Asia – a significant early market for overseas photography. Chapter 3 looks at Beato’s Views and Costumes albums (c. 1868) and problematizes previous readings, arguing for a more nuanced and cross-cultural approach. This chapter also offers evidence to support a realignment (caused by previous misbinding) of the V&A Views album. Chapter 4 employs Beato’s Korean album (1871) as a case study and reveals pictorial slippage across albums previously believed to be homogenous. Chapter 5 explores the secondary use of overseas photographs as engravings in the British press and publications. The thesis concludes that nineteenth-century photographic albums compiled by naval officers while on overseas service offer visual evidence that vision underwent a profound shift during this time and that looking at the world became subjective, fragmentary and contingent

COMBINING STRUCTURE FROM MOTION TECHNIQUES WITH LOW COST EQUIPMENT FOR A COMPLETE 3D RECONSTRUCTION OF A 13TH CENTURY CHURCH: The case of transformation of the saviour church in Meskla, in Crete Island

[EN] The use of 3D digitization and modelling in documenting heritage sites has increased significantly over the past few years. This paper presents the process of a monument’s virtual 3D reconstruction using Structure from Motion techniques with common, user friendly, low cost equipment. The byzantine church of the Transformation of the Saviour in Meskla, Crete, aged back to the 13th c., has been photographed by two student groups and the two models were merged into one unified 3D scene.The detailed and high quality products of the 3D modelling can be used for educational and research purposes but also for the touristic promotion of the area through light, easy to use, 3D visualizations on the web.Parthenios, P.; Androulaki, T.; Gereoudaki, E.; Vidalis, G. (2016). COMBINING STRUCTURE FROM MOTION TECHNIQUES WITH LOW COST EQUIPMENT FOR A COMPLETE 3D RECONSTRUCTION OF A 13TH CENTURY CHURCH: The case of transformation of the saviour church in Meskla, in Crete Island. En 8th International congress on archaeology, computer graphics, cultural heritage and innovation. Editorial Universitat Politècnica de València. 476-479. https://doi.org/10.4995/arqueologica8.2015.4169OCS47647