Fig. 1. Incoherent light propagation

Fig. 2. Experiment structure of non-line-of-sight imaging

Fig. 3. Structural diagram of URNet network

Fig. 4. Structures of bottleneck layer. (a) Classical structure of bottleneck layer. (b) improved structure of bottleneck layer

Fig. 5. Retrieving results of different bottleneck layer models. (a) Ground truths; (b) speckle images; (c) retrieving results of classical bottleneck layer model; (d) retrieving results of improved bottleneck layer model; (i)-(iv) represent different handwriting characters 3,4,5, and 8, respectively

Fig. 6. Retrieving results of handwriting English letters. (a) Ground truths; (b) speckle images; (c) retrieving results of URNet model; (i)-(iv) represent different handwriting English letters U, S, H, and C,respectively

Fig. 7. Retrieving results under external interference. (a) Results of occlusion of speckle signal; (b) retrieving results of URNet model. (i)-(vi) represent occlusion proportion of 0, 0.0625, 0.1250, 0.1875, 0.2500, and 0.3125, respectively

Fig. 8. Retrieving results of different models. (a) Ground truths; (b) retrieving results of URNet model; (c) retrieving results of speckle autocorrelation model; (i)-(iv) different handwriting characters 9, 2, 6, and 0, respectively