Fig. 1. Schematic of spiral ZPCI. (a) Encoding process; (b) decoding process

Fig. 2. (a) Intensity distribution of particle source; (b) structure of spiral zone plate with p=3; (c) coded image after encoding

Fig. 3. Edge-enhancement image of particle source obtained by optical simulation method

Fig. 4. Decoded image of particle source obtained by Fresnel ZPCI method

Fig. 5. Layout of visible light demonstrative experiment

Fig. 6. (a) Coded image after spiral zone plate encoding; (b) decoded image obtained by optical simulation method

Fig. 7. (a) Coded image after Fresnel zone plate encoding; (b) decoded image obtained by optical simulation method