Fig. 1. Process of searching code word for coded exposure and recovering blurred image

Fig. 2. Schematics diagram of camera shutter switch in time and frequency domain. (a) Traditional camera shutter switch in time domain; (b) encodin camera shutter switch in time domain; (c) frequency spectrum of Fig.1(a); (d) frequency spectrum of Fig.2(b)

Fig. 3. Flow chart of the intelligent optimization algorithm

Fig. 4. Performance comparison curve of different code word acquisition methods

Fig. 5. Recovery results of flower with 32-bit codeword sequence. (a) Blurred image of code word exposure of reference [9] method; (b) blurred image of code word exposure of reference [4] method; (c) blurred image of code word exposure of proposed method; (d)‒(f) recovery results of image corresponding to Fig.5 (a)‒(c) respectively; (g)‒(i) local amplification maps corresponding to Fig.5 (d)‒(f) respectively

Fig. 6. Recovery results of figure with 32-bit codeword sequence. (a)‒(c) Exposure image with codeword of reference [9] and its recovery results; (d)‒(f) exposure image with codeword of reference [4] and their recovery results; (g)‒(i) exposure image with codeword of proposed method and recovery results

Fig. 7. Comparison results of different blurred images of shell exposed by different codeword sequences and the restoration images. (a) blurred image with the codeword of reference [9]; (b) blurred image with the codeword of reference [4]; (c) blurred image with the codeword of the proposed method; (d)‒(f) recovery results of image corresponding to Fig.7 (a)‒(c) respectively; (g)‒(i) local amplification maps corresponding to Fig.7 (d)‒(f) respectively