Fig. 1. Experimental setup for computational ghost imaging

Fig. 2. Speckle movement. (a) Speckle movement method; (b) original image of the 40th speckle image,corresponding to K₀; (c)‒(j) the 40th speckle images after movement

Fig. 3. The processing results of binary character “cust” and image “lena”.(a) Binary character “cust” image;（b）“cust” simulation image based on DCT speckle and Sobel operator；（c）“cust"simulation image based on DCT speckle and improved template Sobel operator；（d）“cust” simulation image based on DCT speckle and Scharr operator；（e）“cust” simulation image based on DCT speckle and improved template Scharr operator；（f）“lena” image；（g）“lena” simulation image based on DCT speckle and Sobel operator；（h）“lena” simulation image based on DCT speckle and improved template Sobel operator；（i）“lena” simulation image based on DCT speckle and Scharr operator；（j）“lena” simulation image based on DCT peckle and improved template Scharr operator

Fig. 4. Normalized intensity distribution results of the “lena” image using Sobel and Scharr operators. (a) “lena” image; (b) “lena” image normalized using the improved template Sobel operators for intensity distribution results of edge detection line 5; (c) “lena” image normalized using the improved template Scharr operators for intensity distribution results of edge detection line 5

Fig. 5. The processing results of “cust” and “GI” at different sampling numbers. (a) Original image of “cust”; (b) simulation diagram of 1024 undersampling edge extraction results for “cust”; (c) simulation diagram of 2048 undersampling edge extraction results for “cust”; (d) simulation diagram of 3072 undersampling edge extraction results for “cust”; (e) simulation diagram of 4096 full sampling edge extraction results for “cust”; (f) original image of “GI”; (g) simulation diagram of 1024 undersampling edge extraction results for “GI”; (h) simulation diagram of 2048 undersampling edge extraction results for “GI”; (i) simulation diagram of 3072 undersampling edge extraction results for “GI”; (j) simulation diagram of 4096 full sampling edge extraction results for “GI”

Fig. 6. Computational ghost imaging experiment. (a) Experimental setup diagram; (b) the metal aluminum plate used in the experiment,with a hollow “C” carved in the center; (c) the result graph of speckle movement using the Scharr operator without improved template; (d) the result graph of speckle movement using the improved template Scharr operator; (e) the result graph of speckle movement using Sobel operator with improved template