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

本研究旨在开发一套以个人电脑、电视监视器、火焰缓冲器、影像扫描仪为输入设备，以全彩打印机和/或录像机为输出设备的计算机辅助视频模拟系统(LANDSCAD：Landscape CAD)，作为园林绿化、街道改造等基础设施规划的辅助决策工具。它还包括磁光盘，用于存储和检索大量的景观图像数据。本系统使用MS-C(部分QUICK-BASIC)编程语言，通过在监视器屏幕上显示现有场景的视觉图像来处理景观图像的合成，并对叠加元素的部分图像进行移动、缩小或旋转操作。最后，对规划后的景观图像进行降噪处理，将处理后的地物图像保存在磁光盘中。我们还开发了一个图片库系统，管理大量的树木、铺路材料等局部图像，用户可以从其中快速检索和选择合适的元素。为了考察LANDSCAD的有效性，我们在东京郊区的一个居民区进行了案例研究，那里的居民正在试图制定一个自己社区的交通疏导方案。我们为居民提供了用LANDSCAD制作的视频监视器上显示的设计方案，并观察其在决策过程中的有效性，通过配对对比检验和对LANDSCAD对居民设计理念偏好的调查，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.