Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Yoshiki Hori Last modified date:2023.11.22

Professor / Environmental Engineering, Planning and Design Section / Department of Architecture and Urban Design / Faculty of Human-Environment Studies

1. OGAWA,T., HORI,Y., Applying RANSAC Algorism to Analyse Archaeological and Architectural Materials from Ostia Antica., 2021.09, [URL], There are not the same shapes in ancient Roman artifacts strictly, and they usually confuse a geometry shape and free-form surfaces in themselves. It’ s difficult to precisely measure objects because of these shapes which were made by hand labour regardless of object’ s type and scale.
For example, “ mensa ponderariae ” , standard measurement gauges were used for cubic and dry measure in ancient Roman period, and these shapes of cavities chiselled in a marble brock are different from each other region.
In this poster presentation, we have two main aims.
1) To extract a geometrical shape (a sphere in this case) from a cavity of the mensa ponderaria in Ostia
2) To reconstruct the chiselling cavity process
To accomplish the first aim, mensa ponderariae were accurately measured by OPT scanner keeping a side length of each triangle of mesh data
within 3mm, and point cloud data were made from vertexes of these mesh data. Then, RANSAC algorism, the process which excludes “gross error” from point cloud were applied, and it enables us to exclude shapes of free-form surfaces, which could be made by hand labour in the Roman empire. A sphere was extracted from a point cloud, which is remaining through this process, by least square method.
For the second aim, these extracted spheres were used as the criterion of analysing shapes of free-form surfaces excluded in RANSAC algorism process. Then, the chiselling cavity process will be reconstructed based upon scientific evidences.
Five mensa ponderariae in Ostia were measured by Kyushu University in 2015..
2. OGAWA,T.,HORI,Y.,AYATSUKA,I., Measurement Conversion in Pompeii and Herculaneum, 2021.09, [URL], The measuring gauge, the ‘ mensa ponderaria ’ , which was reported first by Mancini in the late 19th century, was discovered in the room of the western pilaster of the temple of Apolo facing to the Forum in Pompeii. The mensa ponderaria has five main cavities and four sub cavities for volume measurement. It is considered that it would have been used in Samnites period and converted to Roman measure by expanding the existing cavities. Measurement values of each volume of cavities in the previous studies are slightly different due to accuracy, and each volume does not exactly match Roman measure. In this poster presentation, accuracy in measurement was improved by using OPT scanner, and gained values of each volume compared with these of well-preserved water containers in Herculaneum..
3. Y. B. Lim, T. Ogawa, Y. Hori, DETECTION OF RESTORATION WORK BY APPLYING THE RANSAC ALGORITHM TO THE POINT CLOUD DATA FROM LASER SCANNING: CASE STUDY AT OSTIA, Remote Sensing and Spatial Information Sciences,, XLVI-2, W1, 315-321, 2022.02, In Ostia, the huge range of excavation carried out by Guido Calza under Mussolini (1938-1942), the zone of contiguous city blocks unearthed in those massive campaigns. From 2012, new survey by a Japanese team of standing remains using laser scanners formed the basis for an analysis of building history, and for a reconstruction of the original building. There is a considerable amount of undocumented reconstruction work in the upper part of the structure which has been identified from analysis of the surface of the walls. The seam and the absence of coursing between the original walls and the later restored works sometimes including in the Roman phase, and sometimes modern using original part of the walls, make difficult to identify which part of walls were original and which were restorations or re-use 80 years later from the excavation. In this paper, the case that the seams are invisible, but its existence is known from the photographic record of the progress of the excavations. The detection by applying the RANSAC algorithm to the point cloud data from laser scanning relies on several cases of invisible seams running on the surfaces. Additionally, this method allows us without any special knowledge and experience to find detailed characteristics on the surface of the walls, such as slight unevenness or weathering parts, to extrapolate the building history..
4. Ogawa,T., and Hori,Y., Comparison with Accuracy of Terrestrial Laser Scanner by Using Point Cloud Aligned with Shape Matching and best Fitting Methods, Remote Sensing and Spatial Information Sciences,, XLII-2, W9, 535-541, 2019.02, Recently operation systems of laser scanning have been obviously improved; for instance shape matching has been equipped with software on a post processing stage so measurement without any targets is a prerequisite condition of field surveying with laser scanners. Moreover a shape matching method enables us to easily register a pair of point clouds with some errors even if those data are scanned by several type scanners. Those slightly errors can influence accuracy of alignments if the object is large to require a lot of scans. Laser scanning data has random errors and accuracy of alignments can be improved by matching error distributions of pairs of point clouds to natural distributions. This method is called “best fitting” in contrast “shape matching” in a software, PolyWorks |Inspector. In this paper, accuracy of alignments between shape matching and best fitting is discussed. The scan data of three phaseshift laser scanners (FARO Focus 3D MS120, FARO Focus 3D X330 and Z+F Imager 5016) and two time-of-flight scanners (Leica BLK 360 and Leica Scan station C5) are used for analyses. Accuracy of alignments by using shape matching and best fitting methods is demonstrated by showing points of scan data with histograms of error distributions..
Research on Urbanisation of Pompeii IV.
6. Topographical survey of Republican ground surface and Imperial street surface in Osita Antica
Research on Roman urbanism in Ostia III.
8. Yoshiki hori, Osamu Ajioka, APPLICATION OF SFM AND LASER SCANNING TECHNOLOGY TO THE DESCRIPTION OF MOSAICS PIECE BY PIECE , SPRS Technical Commission, SPRS Technical Commission, V, 23-25, 2014.06, Mosaic floors of surviving buildings in Ostia have been mainly recorded in photographs. From 2008, Japanese research group carries out a project of 3d measuring of the whole structure of ancient Roman city Ostia using laser scanners, including its landscape, city blocks, streets, buildings, wall paintings and mosaics. The laser scanner allows for a more detailed analysis and a greater potential for recording mosaics. We can record the data of mosaics, which are described piece by piece. However it is hard to acquire enough high dense point cloud and the internal camera of the laser scanner produce low quality images. We introduce a possible technology of 3D recording of mosaics with high-quality colour information; SFM. The use of this technique permits us to create 3D models from images provided from a CCD camera without heavy and large laser scanners. We applied SFM system to different three types of the mosaics laid down on the floors of “the House of the Dioscuroi”, “the Insula of the Muse” and “the House of Jove and Ganymede”, and created high resolution orthographic images. Then we examined to compare these orthographic images with that are created from the point cloud data. As a result, we confirmed that SFM system has sufficient practical utility for the mosaic research. And we present how much of density of point cloud or ground resolution are required for the documentation of mosaics accurately..
9. Yoshiki hori, Revising the General Map and Applying Laser-Scanning Technology in Ostia, From 2008 to 2010, the investigation in Ostia, applying the laser-scanning technology, has been carried out by Japan Research Group that provided important new evidence for its city fabrics, topographical features, and process of mosaic production.
We introduce two results; revising the general map of Ostia in high raised buildings and identifying errors of a mosaic describing Venuses in the House of Dioscuri, and finally suggest the possibility of laser-scanning technology in heirtage management. Firstly, one of our main purposes in our work of re-measuring the streets and buildings in Calza’s map, which is still general but unreliable in detail, and in Manucci’s photos, which is incomplete below tall and wide trees covering the structures, is providing a basic and complete map of site. Secondary, we created an orthographic photo, which gives the description of that mosaic piece by piece. Furthermore, by confining the detailed analysis, we at least found nine errors on figures. Consequently, those errors reveal the process of mosaic production. We established how laser scanning has given reliability to the work in Ostia, which could be described by 3D and RGB data and essential to a definition of a heritage of the whole city.
10. 堀 賀貴, Osamu AJOKA, Revising the General Map and Applying Laser-Scanning Technology in Ostia, EAA 2012 Annual Meeting, 2012.08.
11. Yoshiki HORI, Osamu AJIOKA, Measuring urban structures in Ancient Roman Period in Pompeii and Ostia, EAA 2011 Annual Meeting, USB版, 2011.09, ポンペイとオスティアの都市計画について,レーザースキャニングの結果から考察したもの.
12. O.Ajioka, Y.Hori , LASER SCANNING OF A MONOLITHIC COLUMN DURING PROCESSING IN MIDDLE EGYPT, 4th International Workshop 3D-ARCH 2011, USB版, 2011.03.
13. Yoshiki HORI, Drainage System of the Rainwater and the Excess Water Discharged on the Streets of Pompeii, EAA 2010 Annual Meeting, USB版, 2010.09.
16. Yoshiki HORI, Asami HANGHAI, Laser Scanning in Ostia. A Comparative Study of of the Drawings in 1950s and field survey on tall structures., 3D-Arch’ 2009 3D Virtual Reconstruction and Visualization of Complex Architectures, 2009.02.
17. Yoshiki HORI, Ancient Quarry Techniques in the Ptolemaic and Roman Periods in the Middle Egypt, 17th Internatiional Congress of Classical Archaeology, Bollettino di Archeologia Online (BAO), 2009.01.
18. Yoshiki HORI,Osamu Ajioka, Asami Hanghai, Laser Scanning in Pompeian City wall A comparative study of accuracy of the drawings from 1930s to 1940s, 3D-Arch’2007 3D Virtual Reconstruction and Visualization of Complex Architectures, 2007.07.
19. Yoshiki HORI, Formality of Design represented in Finishing of Stone walls in Hagi city of the Edo Period and Stone Processing in 'ying-zao-fa-shi', Proceedings of International Conference on East Asian Architectural Culture Kyoto 2006, pp.345-352, 2006.11.
20. Oda Town House and Oda Archives in Yanai, Yamaguchi, The Building Story and the Development of the Roof Structure.