Use of image restoration and enhancement to improve xhyphen;ray pinhole camera resolution

摘要

Numerical image processing techniques are applied to the restoration of xhyphen;ray pinhole photographs of solid targets irradiated by intense relativistic electron beams. The numerical and analytic bases for image restoration are briefly described. An experimentally determined pointhyphen;spread function for the pinhole camera is utilized to eliminate the effects of highhyphen;energy xhyphen;ray degradation of pinhole resolution. It is shown that penetration by hard x rays from filtered spectra through the pinhole edges can lead to apparent broadening of the electronhyphen;beam pinch on highhyphen;Ztargets. Elimination of xhyphen;ray shinehyphen;through also permits determination of photon intensity from highhyphen;Ztarget ablation products, and improves spatial resolution of the xhyphen;ray source.