中文摘要：

热光鬼成像的图像质量在实际应用中具有重要作用．通过理论分析和数值模拟，发现光场的强度涨落程度会影响热光鬼成像的对比度，基于此，提出可以通过调节热光场的平均强度和强度波动的方差来提高成像对比度，并且研究了这一方法对成像信噪比的影响．将这种方法与另一种提高成像对比度的方法一高阶鬼成像进行了对比，所得结果将有助于提高对热光鬼成像的理解．

英文摘要：

The quality of the image in ghost imaging with thermal light is of great importance in practical applications. Through theoretical analysis and simulation, we find that the intensity fluctuations of the field can greatly influence the visibility of thermal ghost imaging. According to this, we suggest a new scheme to improve the visibility by appropriately scaling the intensity and variance of the incident thermal field. The influence of this method on the signal-to-noise ratio is also studied. In addition, comparison is made with the high- order correlation ghost imaging, another means adopted in recent years to increase the visibility. Our analysis should help promote our understanding of thermal ghost imaging.