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"Drawing Catalogs"
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Louis David, son école et son temps
Extrait: Celui qui, maître d'une idée et soutenu par ses talents, a exercé pendant plus d'un demi-siècle en France et en Europe une influence directe, forte et constante sur les arts qui dépendent de l'imagination, du goût et même de l'industrie, cet homme appartient de droit à l'histoire...\"À PROPOS DES ÉDITIONS LIGARANLes éditions LIGARAN proposent des versions numériques de qualité de grands livres de la littérature classique mais également des livres rares en partenariat avec la BNF. Beaucoup de soins sont apportés à ces versions ebook pour éviter les fautes que l'on trouve trop souvent dans des versions numériques de ces textes. LIGARAN propose des grands classiques dans les domaines suivants: • Livres rares
• Livres libertins
• Livres d'Histoire
• Poésies
• Première guerre mondiale
• Jeunesse
• Policier
eBook
Le Corbusier. La Villa Savoye
Par son architecture d'une netteté absolue, la Villa Savoye achevée par Le Corbusier en 1931 est un emblème de l'architecture du XXe siècle reconnaissable entre mille. Elle réalise de manière subtile la fusion des « cinq points de la nouvelle architecture » : plan libre, fenêtre bandeau, façade libre, pilotis et toit-terrasse. Tout en intégrant manifestement des éléments de l'architecture classique, elle fait partie des œuvres pionnières de l'architecture moderne. André Malraux la classa d'ailleurs monument historique en 1965. Avec des documents d'époque et des photographies récentes à l'appui, ce guide présente les nombreuses facettes de cette villa aussi bien au visiteur qu'au lecteur amateur d'architecture.
eBook
Walter Pfeiffer : Bildrausch macht sich bescheiden breit : drawings 1966-2018
Walter Pfeiffer is now a world-renowned photographer. Although he began his artistic career as a draftsman, Pfeiffer's drawings are known to precious few. So this book is an overdue overview of his graphic work, continually engaged in a fertile dialogue with his photographic work. In the early 1970s Pfeiffer produced large-scale hyper-realistic pencil drawings that served as points of departure and even working models for his photographs. This style gave rise to personal works as well as Pfeiffer's legendary posters for the Zèurich Filmpodium, magazine illustrations and commissioned portraits. Beginning in the 1980s and especially in the '90s, Pfeiffer gave up photography for a time to focus on drawings in China ink, colored pencils and watercolors, in which the elegant free play of lines and colors moves into the foreground: intimate portraits of beautiful boys and the artist's close women friends, still lifes and flowers. These pictures are characterized by a cheerful, wakeful sensuality, sure lines and alternation between graphic reduction and a taste for rich ornamentation. This publication is not a conventional retrospective, but a stand-alone artist's book in which to discover the vivacity of his drawings and a new Walter Pfeiffer.
Book
On-line Tools for Solar Data Compiled at the Debrecen Observatory and Their Extensions with the Greenwich Sunspot Data
The primary task of the Debrecen Heliophysical Observatory (DHO) has been the most detailed, reliable, and precise documentation of the solar photospheric activity since 1958. This long-term effort resulted in various solar catalogs based on ground-based and space-borne observations. A series of sunspot databases and on-line tools were compiled at DHO: the Debrecen Photoheliographic Data (DPD, 1974 –), the dataset based on the
Michelson Doppler Imager
(MDI) of the
Solar and Heliospheric Observatory
(SOHO) called SOHO/MDI-Debrecen Data (SDD, 1996 – 2010), and the dataset based on the
Helioseismic and Magnetic Imager
(HMI) of the
Solar Dynamics Observatory
(SDO) called SDO/HMI–Debrecen Data (HMIDD, 2010 – ). User-friendly web-presentations and on-line tools were developed to visualize and search data. As a last step of the compilation, the revised version of Greenwich Photoheliographic Results (GPR, 1874 – 1976) catalog was converted to DPD format, and a homogeneous sunspot database covering more than 140 years was created. The database of images for the GPR era was completed with the full-disc drawings of the Hungarian historical observatories Ógyalla and Kalocsa (1872 – 1919) and with the polarity drawings of Mount Wilson Observatory. We describe the main characteristics of the available data and on-line tools.
Journal Article
Sunspot extraction and hemispheric statistics of YNAO sunspot drawings using deep learning
Sunspot drawings around the globe provide long historical records for understanding the long-term trends in the solar activity cycle. Yunnan Astronomical Observatory (YNAO) in China contributes to the relatively continuous sunspot drawings from 1957 to 2015. This paper proposes a new deep learning method named SPR-mask to extract pores, spots, umbrae and penumbrae in the YNAO sunspot drawings. SPR-mask consists of three parts: backbone, shared head and mask branch. It especially adopts a scale-aware attention network (SAAN) and a PointRend module in the mask branch to improve the accuracy of target edge segmentation. Besides that, each sunspot belonging to the northern or southern (N-S) hemisphere is determined by transforming its cartesian coordinates to spherical coordinates after extracting P, B0 and L0 handwritten in sunspot drawings using a revised Lenet-5 deep learning method. The precision, recall and AP of SPR-mask are 0.92, 0.93, and 0.92, respectively. The test results show the SPR-mask method has a good performance. The numbers and areas of pores, spots, umbrae and penumbrae for the N-S hemisphere are presented and analyzed separately. The YNAO data are also compared with Royal Greenwich Observatory (RGO), Kanzelhöhe Observatory (KSO) and Purple Mountain Astronomical Observatory (PMO) data. The results show similar trends, high correlations, and N-S asymmetries. All data of YNAO are publicly shared at https://github.com/yzs64/YNAO_sd/, which are abundant and complementary to the other sunspot catalogs in the world.
Journal Article