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Phychography is an important technique in the quantitative phase imaging research domain, which employs the illuminating probes to scan the specimen in an overlapped requirement, and the reconstruction is conducted by using the ptychographic iterative engine. But the contradiction between the imaging efficiency and quality has become a bottleneck for its wide applications. In this paper, we start with the fundamental principle of the iterative algorithms for ptychographical imaging, and propose two parallel schemes based on CPU and GPU, besides the influences of the specimen size, the number of blocks and illuminating beams on the speedup of the two schemes are investigated via simulation experiment. The result shows that the complex amplitude of the specimen can be correctly reconstructed, meanwhile, the speed is significantly improved, which reduces the time consumed by one order of magnitude. This improvement solves the above contradiction, so that we can expect to achieve quasi-real-time imaging. The experimental data also indicate that 1) in optimal partition, parallel speedup is related to the size of the specimen, bigger size is corresponding to more obvious acceleration; 2) the same specimen under different partitions will speed up to different extents, which is closely related to the experimental hardware, however the number of illuminating beams has no significant effect on the speedup.
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Keywords:
- ptychography /
- phase retrieval /
- parallel computing
[1] Hoppe W 1969 Acta Cryst. A 25 495
[2] Hoppe W 1969 Acta Cryst. A 25 508
[3] Rodenburg J M, Faulkner H M L 2004 Appl. Phys. Lett. 85 4795
[4] Faulkner H M L, Rodenburg J M 2004 Phys. Rev. Lett. 93 023903
[5] Maiden A M, Rodenburg J M 2009 Ultramicroscopy. 109 1256
[6] HumphryMJ, Kraus B, Hurst A C, Maiden A M, Rodenburg J M 2012 Nature Commun. 3 730
[7] Wang Y L, Shi Y S, Li T, Gao Q K, Xiao J, Zhang S G 2013 Acta Phys. Sin. 62 064206 (in Chinese) [王雅丽, 史祎诗, 李拓, 高乾坤, 肖俊, 张三国 2013 62 064206]
[8] Shi Y S, Wang Y L, Zhang S G 2013 Chin. Phys. Lett. 30 054203
[9] Shi Y S, Li T, Wang Y L, Gao Q K, Zhang S G, Li H S 2013 Opt. Lett. 38 1425
[10] Shi Y S, Wang Y L, Li T, Gao Q K, Wan H, Zhang S G, Wu Z B 2013 Chin. Phys. Lett. 30 074203
[11] Cai J J, Li M S, Zheng F {2007 Computer Technology and Development 10 87 (in Chinese) [蔡佳佳, 李名世, 郑锋 2007 计算机技术与发展 10 87]
[12] Hu X Y, Cao X L, Guo H, Chen J {2012 Chin. J. Comput. Phys. 29 522 (in Chinese) [胡晓燕, 曹小林, 郭红, 陈军 2012 计算物理 29 522]
[13] Frigo M, Johnson S G 1998 Acoustics Speech and Signal Processing. Proceedings of the 1998 IEEE International Conference Seattle WA, May 12-15, 1998 p1381
[14] Dong L, Ge W C, Chen K L {2010 Information Technology 4 11 (in Chinese) [董荦, 葛万成, 陈康力 2010 信息技术 4 11]
[15] Yang X, Li X Y, Li J G, Ma J, Zhang L, Yang J, Du Q Ye {2014 Spectroscopy and Spectral Analysis 34 498 (in Chinese) [杨雪, 李学友, 李家国, 马骏, 张力, 杨健, 杜全叶 2014 光谱学与光谱分析 34 498]
[16] Li S, Wang J, Sun H 2008 Optics and Precision Engineering 16 2414 (in Chinese) [李仕, 王晶, 孙辉 2008 光学精密工程 16 2414]
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[1] Hoppe W 1969 Acta Cryst. A 25 495
[2] Hoppe W 1969 Acta Cryst. A 25 508
[3] Rodenburg J M, Faulkner H M L 2004 Appl. Phys. Lett. 85 4795
[4] Faulkner H M L, Rodenburg J M 2004 Phys. Rev. Lett. 93 023903
[5] Maiden A M, Rodenburg J M 2009 Ultramicroscopy. 109 1256
[6] HumphryMJ, Kraus B, Hurst A C, Maiden A M, Rodenburg J M 2012 Nature Commun. 3 730
[7] Wang Y L, Shi Y S, Li T, Gao Q K, Xiao J, Zhang S G 2013 Acta Phys. Sin. 62 064206 (in Chinese) [王雅丽, 史祎诗, 李拓, 高乾坤, 肖俊, 张三国 2013 62 064206]
[8] Shi Y S, Wang Y L, Zhang S G 2013 Chin. Phys. Lett. 30 054203
[9] Shi Y S, Li T, Wang Y L, Gao Q K, Zhang S G, Li H S 2013 Opt. Lett. 38 1425
[10] Shi Y S, Wang Y L, Li T, Gao Q K, Wan H, Zhang S G, Wu Z B 2013 Chin. Phys. Lett. 30 074203
[11] Cai J J, Li M S, Zheng F {2007 Computer Technology and Development 10 87 (in Chinese) [蔡佳佳, 李名世, 郑锋 2007 计算机技术与发展 10 87]
[12] Hu X Y, Cao X L, Guo H, Chen J {2012 Chin. J. Comput. Phys. 29 522 (in Chinese) [胡晓燕, 曹小林, 郭红, 陈军 2012 计算物理 29 522]
[13] Frigo M, Johnson S G 1998 Acoustics Speech and Signal Processing. Proceedings of the 1998 IEEE International Conference Seattle WA, May 12-15, 1998 p1381
[14] Dong L, Ge W C, Chen K L {2010 Information Technology 4 11 (in Chinese) [董荦, 葛万成, 陈康力 2010 信息技术 4 11]
[15] Yang X, Li X Y, Li J G, Ma J, Zhang L, Yang J, Du Q Ye {2014 Spectroscopy and Spectral Analysis 34 498 (in Chinese) [杨雪, 李学友, 李家国, 马骏, 张力, 杨健, 杜全叶 2014 光谱学与光谱分析 34 498]
[16] Li S, Wang J, Sun H 2008 Optics and Precision Engineering 16 2414 (in Chinese) [李仕, 王晶, 孙辉 2008 光学精密工程 16 2414]
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