Abstract
AbstractColor planning has become a significant issue in urban development, and an overall cognition of the urban color identities will help to design a better urban environment. However, the previous measurement and analysis methods for the facade color in the urban street are limited to manual collection, which is challenging to carry out on a city scale. Recent emerging dataset street view image and deep learning have revealed the possibility to overcome the previous limits, thus bringing forward a research paradigm shift. In the experimental part, we disassemble the goal into three steps: firstly, capturing the street view images with coordinate information through the API provided by the street view service; then extracting facade images and cleaning up invalid data by using the deep-learning segmentation method; finally, calculating the dominant color based on the data on the Munsell Color System. Results can show whether the color status satisfies the requirements of its urban plan for façade color in the street. This method can help to realize the refined measurement of façade color using open source data, and has good universality in practice.
Highlights
Most proportions of the historic style area, the dominant color is low saturation (Colors with a saturation of less than 20% accounted for 73% of the total.), like Fig. 6(b) show
In the historic conservation area, the lightness of dominant color of façade usually higher than 60%, and such strict control are mainly distributed in The Confucius Temple, The East Zhonghua Gate Historical Block, Sipailou Campus, and other historic districts, like Fig. 6(c) show
This study proposed a framework for measurement and analysis of façade color in the urban street, including using open platforms to collect data and quantitatively analysis
Summary
Color is people’s first visual impression of the city, which can influence spatial perception in the human-made environment through different color compositions. The city managers attached great importance to the planning of urban color and issued a series of rules. In the 1960s, Paris identified beige as the dominant color of the city. One of the most important cities on eastern China, organize experts to discuss the urban color guidelines and identified light green as the dominant color of the city in 2004 [4]. Most of these urban color plans and regulations regard building color controlling as the most critical implementation program, because buildings are larger and more complex than the products created by human beings
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