Spatial Attention-Guided Light Field Salient Object Detection Network with Implicit Neural Representation

Recently, many Light Field Salient Object Detection (LF SOD) methods have been proposed. However, guaranteeing the integrality and recovering more high-frequency details of the generated salient object map still remain challenging. To this end, we propose a spatial attention-guided LF SOD network with implicit neural representation to further improve LF SOD performance. We adopt an encoder-decoder structure for model construction. In order to ensure the completeness of the generated salient object map, a multi-modal and multi-scale feature fusion module is designed in the encoder part to refine the salient regions within all-in-focus image and aggregate the focal stack and all-in-focus image in spatial attention-guided manner. In order to recover more high-frequency details of the obtained salient object map, an implicit detail restoration module is proposed in the decoder part. In virtue of implicit neural representation, we convert the detail restoration problem into a functional mapping problem. By further integrating the self-attention mechanism, the derived saliency map can be depicted at a more refined level. Comprehensive experimental results demonstrate the superiority of the proposed method. Ablation studies and visual comparisons further validate that the proposed method can guarantee the integrality and recover more high-frequency detail information of the obtained saliency map. The code is publicly available at https://github.com/ldyorchid/LFSOD-Net.