["Transactions in GIS, Volume 30, Issue 5, August 2026. ", "\nABSTRACT\nUnderstanding urban perception from street‐view imagery has become a central topic in urban analytics and human‐centered urban design. However, most existing studies treat urban scenes as static and largely ignore the role of dynamic elements such as pedestrians and vehicles, raising concerns about potential bias in perception‐based urban analysis. To address this issue, we propose a controlled framework that isolates the perceptual effects of dynamic elements by constructing paired street‐view images with and without pedestrians and vehicles using semantic segmentation and generative inpainting powered by large vision models. Based on 720 paired images from Dongguan, China, a perception experiment was conducted in which participants evaluated original and edited scenes (removal of pedestrians and vehicles) across six perceptual dimensions, including wealth, safety, vibrancy, beauty, boredom, and depression. The results indicate that removing dynamic elements leads to a consistent decrease in perceived vibrancy (30.97%), whereas changes in other dimensions are more moderate and heterogeneous. To further explore the underlying mechanisms, we trained 11 machine‐learning models using multimodal visual features. Feature‐importance analysis identifies lighting conditions, human presence, and depth variation as key factors driving perceptual change. At the individual level, 65% of participants exhibited significant vibrancy changes, compared with 35%–50% for other dimensions, revealing notable inter‐individual sensitivity; gender further showed a marginal moderating effect on safety perception. Beyond controlled experiments, the trained model was extended to a city‐scale dataset covering 47,963 locations (191,852 images) to predict vibrancy changes after the removal of dynamic elements. The city‐level results reveal that such perceptual changes are widespread and spatially structured, affecting 73.7% of locations and 32.1% of images, suggesting that urban perception assessments based solely on static imagery may substantially underestimate urban liveliness. Overall, this study highlights the critical role of dynamic elements in shaping urban perception and underscores the importance of accounting for transient urban features in large‐scale perception‐driven urban studies.\n"]