Correction of ultraviolet single photon counting image distortion

Single photon counting imaging technology has been widely used in space environment detection,astronomy observation,nuclear physics,and ultraweak bioluminescenee.However,the distortion of the single photon counting image will badly affect the measurement results.Therefore,the correction of distortion for single photon counting image is very significant.Ultraviolet single photon imaging system with wedge and strip anode is introduced and the infhlence factor leading to image distortion is analyzed.To correct original distorted image,three different image correction methods,namely,the physical correction,the global correction,and the local correction,are applied.In addition,two parameters,i.e.,the position index and the linearity index,are defined to evaluate the performance of the three methods.The results suggest that the correction methods can improve the quality of the initial image without losing gray information of each counting light spot.And the local correction can provide the best visual inspections and performance evaluation among the three methods.