Exploiting redundancy in color-polarization filter array images for dynamic range enhancement

2020 ◽  
Vol 45 (19) ◽  
pp. 5530
Author(s):  
Pierre-Jean Lapray
Keyword(s):  
Dynamic Range ◽  
Polarization Filter ◽  
Filter Array

scholarly journals Calibration algorithms for polarization filter array camera: survey and evaluation

2020 ◽  
Vol 29 (04) ◽  
pp. 1 ◽  
Author(s):  
Yilbert Giménez ◽  
Pierre-Jean Lapray ◽  
Alban Foulonneau ◽  
Laurent Bigué
Keyword(s):  
Polarization Filter ◽  
Filter Array ◽  
Survey And Evaluation ◽  
Array Camera

scholarly journals Survey of Demosaicking Methods for Polarization Filter Array Images

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3688 ◽  
Author(s):  
Sofiane Mihoubi ◽  
Pierre-Jean Lapray ◽  
Laurent Bigué
Keyword(s):  
Strongly Correlated ◽  
Polarization Filter ◽  
Channel Correlation ◽  
Polarization Imaging ◽  
Subjective Analysis ◽  
Filter Array ◽  
Total Polarization ◽  
Polarization States ◽  
Field Oscillation ◽  
Image Difference

Snapshot polarization imaging has gained interest in the last few decades. Recent research and technology achievements defined the polarization Filter Array (PFA). It is dedicated to division-of-focal plane polarimeters, which permits to analyze the direction of light electric field oscillation. Its filters form a mosaicked pattern, in which each pixel only senses a fraction of the total polarization states, so the other missing polarization states have to be interpolated. As for Color or Spectral Filter Arrays (CFA or SFA), several dedicated demosaicking methods exist in the PFA literature. Such methods are mainly based on spatial correlation disregarding inter-channel correlation. We show that polarization channels are strongly correlated in images. We therefore propose to extend some demosaicking methods from CFA/SFA to PFA, and compare them with those that are PFA-oriented. Objective and subjective analysis show that the pseudo panchromatic image difference method provides the best results and can be used as benchmark for PFA demosaicking.

scholarly journals High Dynamic Range Spectral Imaging Pipeline For Multispectral Filter Array Cameras

Sensors ◽  
2017 ◽  
Vol 17 (6) ◽  
pp. 1281 ◽  
Author(s):  
Pierre-Jean Lapray ◽  
Jean-Baptiste Thomas ◽  
Pierre Gouton
Keyword(s):  
Dynamic Range ◽  
Spectral Imaging ◽  
High Dynamic Range ◽  
Filter Array ◽  
High Dynamic ◽  
Multispectral Filter Array

Slow-Scan CCD Observation of Backscattering Patterns in SEM

1992 ◽  
Vol 50 (2) ◽  
pp. 1308-1309
Author(s):  
F. Ouyang ◽  
D. A. Ray ◽  
O. L. Krivanek
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Lens System ◽  
Wide Dynamic Range ◽  
Peltier Cooler ◽  
Diffraction Patterns ◽  
Scanning Electron

Electron backscattering Kikuchi diffraction patterns (BKDP) reveal useful information about the structure and orientation of crystals under study. With the well focused electron beam in a scanning electron microscope (SEM), one can use BKDP as a microanalysis tool. BKDPs have been recorded in SEMs using a phosphor screen coupled to an intensified TV camera through a lens system, and by photographic negatives. With the development of fiber-optically coupled slow scan CCD (SSC) cameras for electron beam imaging, one can take advantage of their high sensitivity and wide dynamic range for observing BKDP in SEM.We have used the Gatan 690 SSC camera to observe backscattering patterns in a JEOL JSM-840A SEM. The CCD sensor has an active area of 13.25 mm × 8.83 mm and 576 × 384 pixels. The camera head, which consists of a single crystal YAG scintillator fiber optically coupled to the CCD chip, is located inside the SEM specimen chamber. The whole camera head is cooled to about -30°C by a Peltier cooler, which permits long integration times (up to 100 seconds).

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