Aiming at simultaneous detection and segmentation (SD-S), we propose a proposal-free framework, which detect and segment object instances via mid-level patches. We design a unified trainable network on patches, which is followed by a fast and effective patch aggregation algorithm to infer object instances. Our method benefits from end-to-end training. Without object proposal generation, computation time can also be reduced. In experiments, our method yields results 62.1% and 61.8% in terms of

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... P r on VOC2012 segmentation val and VOC2012 SDS val, which are stateof-the-art at the time of submission. We also report results on Microsoft COCO test-std/test-dev dataset in this paper.