基于典型街景图像主观评价的街道视觉安全感知特征探析——以大连市为例

Analysis of Street Visual Safety Perception Characteristics Based on Subjective Evaluation of Typical Street View Pictures A Case Study of Dalian

街道作为承载居民日常活动的场所,其视觉安全感知对居民身心健康有重要影响。采用图像语义分割技术,依据街景图像客观环境要素构成特征,通过聚类分析和人工筛选获得典型街景图像;基于网络问卷收集街道环境视觉安全感知的主观评价。通过寻找视觉安全感知评价高和低的街景图像的共性特征总结出:交通空间、街道环境、空间界面3类要素对视觉安全感知具有明显作用,旨在为人本尺度街道设计提供参考。

Street as a place carrying on residents'daily activities,and its visual safety perception has an important impact on residents'physical and mental health.According to the characteristics of objective environment elements of street view images,the typical street view images were obtained by clustering analysis and manual screening using image semantic segmentation technology.Then the subjective evaluation of visual safety perception of street environment was collected through the network questionnaire.The results showed that street facilities-oriented streetscape had the best visual safety perception,street environmentoriented streetscape and traffic environment-oriented streetscape had the second-best visual safety perception,and spatial interface-oriented streetscape had the worst evaluation.By finding the common features of street images with high and low visual safety perception evaluation,it is concluded that traffic space,street environment and spatial interface have obvious effects on visual safety perception.Street scene image elements with high evaluation have a good composition proportion and combination form,and different groups have differences in visual safety perception evaluation of the street environment.Focuses on the visual safety perception characteristics of street environment,aiming to provide reference for the human oriented street design.