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The concept of the “smart city” has emerged with the advancement of technology, but some facilities are not sufficiently intelligent, such as parking lots. Hence, this paper proposes an inexpensive and plug-to-play camera-based smart parking system for airports. The system utilizes inverse perspective mapping (IPM) to provide an aerial view image of the parking lot, which is then processed to extract parking space information. The system also includes a guidance system to assist drivers in finding available parking spaces. The system is simulated on a 3D scene based on the parking lot of Macao International Airport. In the experiment, our system achieved an accuracy rate of 97.03% and a mean distance error of 8.59 pixels. This research study shows the potential of enhancing parking lots using only cameras as data collectors, and the results show that the system is capable of providing accurate and useful information. It performs well in parking lots with open space, in particular. Moreover, it is an economical solution for implementing a smart parking lot.

Background: Massive herniation of the bladder presents a rare diagnostic challenge. Rarely, bladder herniation is complicated by the development of bladder calculi. We present a therapeutic approach for this situation. Case presentation: A 90-year-old presented with recurrent urinary tract infections secondary to bladder calculi in the setting of inguinoscrotal bladder herniation. He subsequently underwent successful trans-scrotal percutaneous cystolitholapaxy as a creative approach to an unusual presentation. Conclusion: Massive inguinoscrotal herniation of the bladder is a rare clinical entity with significant morbidity and mortality. Intervention requires a balance of patient health status and anatomy, lending to creative approaches as necessary.