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Learning RoI Transformer for Oriented ... - CVF Open Access

Learning RoI Transformer for Oriented Object Detection in Aerial ImagesJian Ding, Nan Xue, Yang Long, Gui-Song Xia , Qikai LuLIESMARS-CAPTAIN, Wuhan University, Wuhan, 430079, China{ , xuenan, longyang, , detection in aerial images is an active yet chal-lenging task in computer vision because of the bird s-eyeview perspective, the highly complex backgrounds, and thevariant appearances of objects. Especially when detectingdensely packed objects in aerial images, methods relying onhorizontal proposals for common object detection often in-troduce mismatches between the Region of Interests (RoIs)and objects. This leads to the common misalignment be-tween the final object classification confidence and local-ization accuracy. In this paper, we propose aRoI Trans-formerto address these problems.}

high recalls at the phase of RRoI generation, a large num-ber of anchors are required with different angles, scales and aspect ratios. These methods have demonstrated promis-ing potentials on detecting sparsely distributed objects [26, 43, 27, 30]. However, due to the highly diverse directions

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