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