Improving semantic image segmentation with a probabilistic superpixel-based fully connected CRF

Liang Zhang, Huan Li, Guangming Zhu, Peiyi Shen, Syed Afaq Shah, Mohammed Bennamoun

Research output: Contribution to journalConference article

Abstract

Deep convolutional neural networks (DCNNs) have been driving significant advances in image semantic segmentation tasks due to their power-ful feature representation for recognition. However, their performance in pre-serving object boundaries is still not satisfactory. Visual mechanism theory in-dicates that image segmentation tasks require not only recognition, like DCNNs, but also local visual attention capability. Considering that superpixel is good at grasping detailed local structure, we proposed a Probabilistic Superpix-el-based fully connected CRF model (PSP-CRF) to refine label assignments as a post-processing optimization method. Firstly, we employ the SLIC segmented algorithm to obtain superpixels and employ the well-known DCNNs to produce coarse prediction probabilistic maps at each pixel. We present an effective strategy based on entropy to convert the pixel-level color, position and texture features to the normalized probabilistic superpixels. Secondly, we construct a fully connected CRF model with the probabilistic superpixels as vertexes in-stead of pixels. Thirdly, We optimize the PSP-CRF model to obtain the final la-bel assignment results by employing a highly efficient mean field inference al-gorithm. The experimental results on the PASCAL VOC segmentation dataset demonstrate that the proposed method can improve the segmentation perfor-mance to 82% mIoU while increasing the computational efficiency.
Original languageEnglish
Pages (from-to)15297 - 15310
JournalIEEE Access
Volume6
Publication statusPublished - 12 Mar 2018
EventSecond CCF Chinese Conference - Tianjin, China
Duration: 11 Oct 201414 Oct 2017
Conference number: 2

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