Calibration of a polarization image sensor and investigation of influencing factors

Lane, Connor; Rode, David; Rösgen, Thomas

doi:10.1364/ao.437391

Cited by 40 publications

(31 citation statements)

References 31 publications

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“…Particularly, the lens has been correctly focused at the light source, and the f -number has been set higher than 2.8 for all the experiments. Finally, we have acquired several images with the camera in total darkness and verified that, with a 12-bit pixel count and an exposure time of 1s, the dark current can effectively be neglected as reported in [17].…”

Section: Methodssupporting

confidence: 56%

“…in a dark room to reduce the influence of the environment. Furthermore, the recommendations given in [17] have been followed. Particularly, the lens has been correctly focused at the light source, and the f -number has been set higher than 2.8 for all the experiments.…”

Section: Methodsmentioning

confidence: 99%

“…Additionally, both lenses have been correctly focused on the light source used, and their F-number have been set to 3, which is higher than 2.8. This configuration has been chosen to comply with the recommendations given by [17].…”

Section: Demonstrationmentioning

confidence: 99%

See 2 more Smart Citations

A Practical Calibration Method for RGB Micro-Grid Polarimetric Cameras

Rodriguez

Voon

Martins

et al. 2022

IEEE Robot. Autom. Lett.

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Polarimetric imaging has been applied in a growing number of applications in robotic vision (ex. underwater navigation, glare removal, de-hazing, object classification, and depth estimation). One can find on the market RGB Polarization cameras that can capture both color and polarimetric state of the light in a single snapshot. Due to the sensor's characteristic dispersion, and the use of lenses, it is crucial to calibrate these types of cameras so as to obtain correct polarization measurements. The calibration methods that have been developed so far are either not adapted to this type of cameras, or they require complex equipment and time consuming experiments in strict setups. In this paper, we propose a new method to overcome the need for complex optical systems to efficiently calibrate these cameras. We show that the proposed calibration method has several advantages such as that any user can easily calibrate the camera using a uniform, linearly polarized light source without any a priori knowledge of its polarization state, and with a limited number of acquisitions. We will make our calibration code publicly available.

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Section: Methodssupporting

confidence: 56%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

A Practical Calibration Method for RGB Micro-Grid Polarimetric Cameras

Rodriguez

Voon

Martins

et al. 2022

IEEE Robot. Autom. Lett.

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“…The default gain setting was used, and the exposure time was set to ensure a dynamic range of about 70%. The camera was not calibrated, as measurement errors are estimated to remain below 4% for this setting (Lane et al 2022).…”

Section: Methodsmentioning

confidence: 99%

Birefringent properties of aqueous cellulose nanocrystal suspensions

2022

Self Cite

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Birefringence measurements of aqueous cellulose nanocrystal (CNC) suspensions are reported. Seven suspensions with concentrations between 0.7 and 1.3% per weight are sheared in a Taylor-Couette type setting and characterized using a birefringent measurement technique based on linear polarized light and acquisition with a polarization camera. Steady state measurements with shear rates up to 31 1/s show extinction angles of 23°–40° and birefringence in the order of 1e–5. The findings demonstrate the utility of CNC suspensions for flow birefringence studies.

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“…It is difficult to fabricate an adjustable attenuation microarray mask with conventional optical coating processes. But the adjustable attenuation rate can be achieved indirectly by micro-polarization array mask [20] . The principle of an imaging system with adjustable dynamic range is shown in Figure 1 [21] .…”

Section: Theory and Methodsmentioning

confidence: 99%

Snapshot High Dynamic Range Imaging Based on Adjustable Attenuation Microarray Mask

Wenwenjing¹,

Cao²,

Zhao³

et al. 2023

Preprint

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High Dynamic Range Imaging Based on Attenuation Microarray Mask has broad application prospects due to its good real-time performance and small size. But at the current level of craftsmanship, it is hard to fabricate a micro-attenuation array mask whose attenuation rate is adjustable. This leads to the fact that the imaging dynamic range cannot adapt to changes in scene brightness in most cases. To this end, this paper proposes a novel imaging system where the dynamic range can be adaptively changed according to the brightness of the scene. The core components are the micro polarization array mask mounted on the CMOS surface and the on-sensor rotatable linear polarizer in front of the lens. By controlling the rotation angle of the polarizer placed before the lens, the CMOS pixel exposure can be precisely controlled. Therefore, the imaging system dynamic range can be adjusted adaptively according to the scene brightness. The experimental results show that the imaging performance remains consistently good even when the dynamic range of the scene is large. By rotating the polarizer in front of the lens to a specific angle, the high dynamic imaging of the scene can be significantly improved.

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Calibration of a polarization image sensor and investigation of influencing factors

Cited by 40 publications

References 31 publications

A Practical Calibration Method for RGB Micro-Grid Polarimetric Cameras

A Practical Calibration Method for RGB Micro-Grid Polarimetric Cameras

Birefringent properties of aqueous cellulose nanocrystal suspensions

Snapshot High Dynamic Range Imaging Based on Adjustable Attenuation Microarray Mask

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