Effect of the ratio of black speckle on computational ghost imaging

Abstract

The effect of the ratio of black speckles on computational ghost imaging has been investigated. However, the experimental results are inconsistent with the existing theoretical results. During the imaging process with strong background noise, the image quality is not optimal when the black speckle ratio is 50%. On the contrary, the experimental results indicate that increasing the black speckle ratio can enhance the contrast-to-noise ratio and reduce the correlation calculation time. This phenomenon occurs because, as the black speckle ratio increases, the higher probability of the number of white speckles passing through the object to be imaged deviates from the statistical average, leading to a decrease in the average photocurrent received by the bucket detector and an increase in the variability of the photocurrent. This change is beneficial for improving the imaging quality with background noise.