Multi-scale object detection is a basic challenge in computer vision. Although many advanced methods based on convolutional neural networks have succeeded in natural images. the progress in aerial images has been relatively slow mainly due to the considerably huge scale variations of objects and many densely distributed small objects. In this paper. https://www.nacrack.com/great-pick-Refurbished-Sawgrass-Virtuoso-SG500-Complete-Sublijet-Sublimation-Printer-Kit-flash-buy/