Fig. 1. Schematic diagram of a typical setup for computational ghost imaging with an SLM.

Fig. 2. Histogram to show the phase distribution. For the left one, the amplitude of the sinusoidal function is A=π, and for the right one A=1.87π.

Fig. 3. Ghost imaging results of a binary object, with the phase modulation loaded on the SLM set to be (a) coprime-frequencied sinusoidal, (b) random modulation signal, and (c) sinusoidal signals of the non-coprime different frequencies.

Fig. 4. Comparison between coprime-frequencied modulation and random modulation by the MSE varying with the number of frames, which does not show much difference.

Fig. 5. Image quality measured with the MSE varying with the number of frames, with the modulation frequencies chosen to be 100 prime numbers within the interval of (a) [103, 701], (b) [2, 701], (c) [4003, 5003], and (d) [2, 5003].