A Study on Decision-Aid Device for Infrastructure Planning using Computer-Aided Video Siumulation System (LANDSCAD)

本研究旨在开发一个计算机辅助视频模拟系统（LANDScape: LANDScape CAD），作为景观美化、街道重新设计等基础设施规划的决策辅助工具。该系统主要由个人电脑、电视监视器、火焰缓冲器、作为输入设备的图像扫描仪和作为输出设备的全彩打印机和/或VTR组成。它还包括磁光盘存储和检索大量的景观图像数据。本系统使用的编程语言是MS-C（部分为QUICK-BASIC）。景观图像的合成是通过在监视器屏幕上显示现有场景的视觉图像，并对重叠元素的部分图像进行移动、减少或旋转的操作来处理的。最后，通过降噪处理对方案景观处理后的图像质量进行细化，并将完成的方案图像保存在磁光盘中。我们还开发了一个图像数据库系统，管理大量的局部图像，如树木和铺路材料，用户可以从中快速检索和选择合适的元素。为了调查景观设计的有效性，我们在东京郊区的一个住宅区进行了一个案例研究，那里的居民正试图在他们自己的社区建立一个平静交通的计划。我们为居民提供了由landscape制作的视频监视器显示的设计方案，并观察其在决策过程中的有效性。通过配对对比测试和使用景观设计对居民对设计概念偏好的调查，阐明了该支持系统的有效性。

This study aims to develop a computer-aided video simulation system (LANDSCAD : LANDScape CAD) as a means of decision-aid device for infrastructure planning such as landscaping, street re-designing, and so on.This system consists mainly of a personal-computer, a TV monitor, a flame buffer, an image scanner as an input device, and a full-color printer and/or a VTR as output device (s). It also includes magneto-optical disk to storage and retrieve a lot of landscape image data. The programming language we used in this system is MS-C (Partly QUICK-BASIC).The composition of landscape image is processed by means of visual image of an existing scene displayed on a monitor screen, with operations of moving, reducing or rotating partial images of superimposed elements. In the end, the quality of processed image of the landscape of proposed plan is refined by noise reduction process, and the completed images of porposals are saved in magneto-optical disk.We also developed a picture-data base system managing a lot of partial images such as trees and paving materials, from which users can quickly retrieve and choose suitable elements.To investigate the effectiveness of LANDSCAD, we carried out a case study in a residential district in a suburban city of Tokyo, where residents are trying to set up a plan for calming traffic in their own neighborhood.We provided the residents with design alternatives shown on a video monitor prepared by means of LANDSCAD, and observed its effectiveness on the process of decision making.Through the paired comparison test and the investigations into the usage of LANDSCAD on the residents' preference about the design concepts, the effectiveness of this support system has been elucidated.