【Report】The 48th AJI Frontier Seminar was held! Mr. Daimon AOI gave his presentation about transparent stereoscopic visualizations of laser-scanned 3D point clouds.

On Tuesday, October 11, the 48th AJI Frontier Seminar took place online. Mr. Daimon AOI (Doctoral student, Graduate School of Information Science and Engineering, Ritsumeikan University) made an informative presentation titled “Edge Highlighting as a Visual Guide in Transparent Stereoscopic Visualizations of Laser-Scanned 3D Point Clouds”.

Computer graphics (CG) are used in various fields of society today such as medicine, science, and entertainment. In his research, Mr. Aoi is using this technology to visualize the invisible internal structure of cultural buildings. He gave us an interesting presentation on overcoming the technical problem of approximating the depth of the internal structure reproduced by using only three-dimensional data of the real object. Mr. Aoi used the example of the Yamahoko float in the Kyoto Gion Festival, which he especially focuses on in his research. His method is to visualize the internal structure of this historical float in transparent form like an X-ray image and then reproduce the actual three-dimensional structure using CG. However, while the technology for the transparent stereoscopic visualization has the advantage of providing a clear view of the internal structure of a certain object using three-dimensional data, researchers have found that depths are underestimated and appear shallower than they actually are. To tackle this problem, Mr. Aoi demonstrated with concrete evidence that the three-dimensional effect of the data can be visually enhanced by adding red highlighted lines to the edges of an object thus enabling the perceived depth to be closer to the actual depth.

Furthermore, he emphasized the need for researchers in his field to get the most accurate figures possible by adding more ingenuity to the edge highlighting to enhance the back side of 3D structures that are currently difficult to see.

Mr. Aoi’s audience included scientists from a wide range of fields, but his interesting presentation aroused the curiosity of researchers outside his speciality, because he provided us with many examples of CG images and showed us the social significance of visualizing the internal structure of cultural buildings using CG technology.

In the Q&A session, the attendees could share in meaningful discussions on topics such as the possibility of replicating the entire image of a lost historical heritage from fragmentary information, the significance of enhancing the depth of the image as Mr. Aoi had explained in his presentation, the possibility that the three-dimensional figure of an object will be distorted by the angle of the viewer, and a philosophical question that the 3D dimensionality of CG images depends on human visual sense, and its impact on Mr. Aoi’s research.

Mr. Aoi delivering his presentation