Fig. 1. Schematic for imaging via speckle illumination

Fig. 2. Relationship between the transverse coherence length of speckle on object plane and the imaging resolution with D=4 mm. (a) Result of traditional incoherent imaging and coherent imaging;(b) result of first order autocorrelation imaging

Fig. 3. Numerical Simulation results in the transverse coherence length of speckle on object plane on the imaging resolution with D=4mm. (a1) Original object; (a2) result of traditional incoherent imaging; (a3) result of traditional coherent imaging; (b1)-(b5) results of first order autocorrelation imaging with different transverse coherence lengths (frame number N is 2000 and lc is 10, 30, 50, 80, 300 μm, respectively); (c1) comparison of cross-sectional view of a1, a2 and b1; (c2) comparison of cross-

Fig. 4. Relationship between the numerical aperture of the imaging system and the imaging resolution with lc=33 μm. (a) Result of traditional incoherent imaging; (b) result of traditional coherent imaging (c) result of first order autocorrelation imaging; (d) result of second-order autocorrelation imaging of intensity fluctuation

Fig. 5. Numerical simulation results of the numerical aperture of the imaging system on the imaging resolution with lc=33 μm. (a1)-(a4) Results of traditional incoherent imaging; (b1)-(b4) results of first order autocorrelation imaging;(c1)-(c4) results of second-order autocorrelation imaging of intensity fluctuation (D is 4.0, 3.4, 3.1, 2.9 mm, respectively);(d1)-(d4) comparison of the cross-sectional view of three different imaging methods with different D values