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Greenways are an important component of the ecological network of urban green spaces and contribute to ensuring a complete and continuous ecosystem. Once a city’s greenways have been built, their future success relies heavily on visitors’ intuitive feelings and satisfaction. Therefore, it is necessary to evaluate visitor satisfaction with greenways. Using Greenway No. 1 in Shanghai’s Minhang District as an example, we in this article constructed an index system to evaluate visitor satisfaction with the greenway based on a fuzzy comprehensive evaluation method. The visitors’ demographic and behavioral characteristics and their comprehensive reviews of Greenway No. 1 were analyzed. The results showed that the gender ratio among visitors to Greenway No. 1 was relatively balanced. Most visitors were retired and elderly, and most were from nearby areas. The visitors used the greenway frequently, and the travel time for most was less than ten minutes. The overall visitor satisfaction with the greenway reached the “satisfied” level, and most indices reached the basic level of satisfaction. However, certain basic service facilities were found to be inadequate. The results provide suggestions and references for the construction of greenways in Shanghai and surrounding provinces and cities.

In order to improve Grab Cut implementation effect for real images, we propose a novel improvement which extends the Grab Cut in three aspects: 1) a series of edge-preserved components are generated via the TV smoothing model; 2) the number of sub-regions is estimated by histogram shape analysis to remove the negative effects on the unreasonable number of the sub-regions; 3) a segmentation termination condition is constructed by integrating the multi-scale components. The experiment result indicates that this method performs well compared to other methods based on graph cut and is insensitive to sub-regions.