Abstract
A new method is proposed to improve the signal-to-noise ratio (SNR) of regions of interest (ROIs) in a ghost imaging (GI) system with uneven speckle illumination. The imaging results in a GI system can be distorted when there is an uneven distribution of light. In this study, three thin-film polarizers are used to create illumination patterns in uneven light intensity distribution. In particular, the polarizer set is loaded on the object arm only, that is, the original uniformly distributed light field is still acquired by the reference arm. This small change in the light path eliminates the distortion caused by uneven illumination while increasing the SNR of the ROI. This strategy has been confirmed in principle and through simulation and experiments.
Highlights
Ghost imaging (GI) [1,2,3,4,5,6], known as correlated imaging, can recover the information of an object utilizing a detector without spatial resolution. e classic GI system typically consists of two arms; one directly collects the spatial distribution of the light source with an area array detector, and the other collects the intensity information of the object through a bucket detector. is information, acquired synchronously on the two arms, can recover the image of the target through a correlation operation
With the rotation of the frosted glass, the thermal light can be seen as a set of time-varied illumination patterns of Gaussian distribution. e illumination mode is, closely related to the imaging quality [12, 21,22,23], and uneven distribution of light intensity in the illumination modes will redistribute the signal-to-noise ratio (SNR) [24] in addition to the distortion of the image
Three thin-film polarizers were used to create illumination patterns of the uneven light intensity distribution. e polarizer set was loaded on the object arm only, that is, the original uniformly distributed light field was still acquired by the reference arm. is small change in the light path contributed to the elimination of the distortion caused by uneven illumination while increasing the SNR of the region of interest (ROI). is strategy has been confirmed in principle and through simulation and experiments
Summary
Ghost imaging (GI) [1,2,3,4,5,6], known as correlated imaging, can recover the information of an object utilizing a detector without spatial resolution. e classic GI system typically consists of two arms; one (the reference arm) directly collects the spatial distribution of the light source with an area array detector, and the other (the object arm) collects the intensity information of the object through a bucket detector. is information, acquired synchronously on the two arms, can recover the image of the target through a correlation operation. Ghost imaging (GI) [1,2,3,4,5,6], known as correlated imaging, can recover the information of an object utilizing a detector without spatial resolution. With the rotation of the frosted glass, the thermal light can be seen as a set of time-varied illumination patterns of Gaussian distribution. E illumination mode is, closely related to the imaging quality [12, 21,22,23], and uneven distribution of light intensity in the illumination modes will redistribute the signal-to-noise ratio (SNR) [24] in addition to the distortion of the image. Actively generated uneven light fields can improve the SNR of local ROIs. In this study, three thin-film polarizers were used to create illumination patterns of the uneven light intensity distribution. Three thin-film polarizers were used to create illumination patterns of the uneven light intensity distribution. e polarizer set was loaded on the object arm only, that is, the original uniformly distributed light field was still acquired by the reference arm. is small change in the light path contributed to the elimination of the distortion caused by uneven illumination (no additional postdigital processing was required) while increasing the SNR of the region of interest (ROI). is strategy has been confirmed in principle and through simulation and experiments
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