Fig. 1. Schematic of CGI scheme

Fig. 2. Reconstruction results. (a) Original image; (b) reconstruction result of SGI; (c) reconstruction result using only sinusoidal speckle; (d) reconstruction result using only cosine speckle

Fig. 3. Principle of image generation by using orthogonal sinusoidal speckle. (a) 45° sinusoidal speckle; (b) 135° sinusoidal speckle; (c) speckle after superposition

Fig. 4. Reconstruction results of different gray targets obtained by proposed algorithm under different upper frequency limits. (a) Objects to be imaged; (b) 20 rad/rotation (1849 speckles); (c) 22 rad/rotation (2209 speckles); (d) 24 rad/rotation (2601 speckles); (e) 26 rad/rotation (3025 speckles); (f) 28 rad/rotation (3481 speckles); (g) 30 rad/rotation (4096 speckles)

Fig. 5. Performance parameter curves of different gray-scale target reconstruction results under different upper frequency limits. (a) PSNR; (b) SSIM

Fig. 6. Multi-slit diagonal stripe patterns with different widths between black and white grids and their reconstructed results. (a) 2 pixel; (b) 4 pixel; (c) 6 pixel; (d) 8 pixel; (e) 10 pixel; (f) 12 pixel

Fig. 7. PSNR curve of reconstructed image with different widths of multi-slit diagonal stripes

Fig. 8. Imaging results of various reconstruction methods. (a) Objects to be imaged; (b) TGI; (c) DGI; (d) HCGI; (e) proposed method

Fig. 9. Imaging results of SGI and proposed method

Table 1. Performance comparison of four imaging methods for “rice”

Table 2. Performance comparison of four imaging methods for “camera-man”

Table 3. Performance comparison of four imaging methods for “moon”