Fast correction method for the translation position error of ptychography

Abstract Translation position errors in ptychography can significantly reduce the reconstruction quality. It is crucial to obtain the accurate translation positions between the probe and the object. Current methods for correcting the translation position error are applied into the iterative process of ptychography that will increase the computation time of a single iteration, and take much time to correct the translation position error and obtain a high reconstruction quality. A sub-pixel block matching method is proposed to ultrafast correct the translation position errors and greatly reduce the correction time. This method is applied in the preprocessing stage before iterations that does not increase the computational burden of a single iteration in ptychography and can quickly correct the translation position error. Simulations and experiments demonstrate that our method can significantly improve computational efficiency with ensuring correction accuracy.