scholarly journals Single Day Outdoor Photometric Stereo

2020 ◽  
pp. 1-1 ◽  
Author(s):  
Yannick Hold-Geoffroy ◽  
Paulo Gotardo ◽  
Jean-Francois Lalonde
Keyword(s):  
Photometric Stereo

A fast LED calibration method under near field lighting based on photometric stereo

2021 ◽  
Vol 147 ◽  
pp. 106749
Author(s):  
Long Ma ◽  
Yuzhe Liu ◽  
Jirui Liu ◽  
Shengwei Guo ◽  
Xin Pei ◽  
...  
Keyword(s):  
Near Field ◽  
Calibration Method ◽  
Photometric Stereo

scholarly journals Photometric stereo-based high-speed inline battery electrode inspection

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Christian Kapeller ◽  
Ernst Bodenstorfer
Keyword(s):  
Quality Control ◽  
System Architecture ◽  
High Speed ◽  
Shape From Shading ◽  
Production Quality ◽  
Photometric Stereo ◽  
Inspection System ◽  
Coating Materials ◽  
Production Quality Control ◽  
Reconstruction Performance

Abstract Battery technology is a key component in current electric vehicle applications and an important building block for upcoming smart grid technologies. The performance of batteries depends largely on quality control during their production process. Defects introduced in the production of electrodes can lead to degraded performance and, more importantly, to short circuits in final cells, which is highly safety-critical. In this paper, we propose an inspection system architecture that can detect defects, such as missing coating, agglomerates, and pinholes on coated electrodes. Our system is able to acquire valuable production quality control metrics, like surface roughness. By employing photometric stereo techniques, a shape from shading algorithm, our system surmounts difficulties that arise while optically inspecting the black to dark gray battery coating materials. We present in detail the acquisition concept of the proposed system architecture, and analyze its acquisition-, as well as, its surface reconstruction performance in experiments. We carry these out utilizing two different implementations that can operate at a production speed of up to 2000 mm/s at a resolution of 50 µm per pixel. In this work we aim to provide a system architecture that can provide a reliable contribution to ensuring optimal performance of produced battery cells.

Uncalibrated photometric stereo refined by polarization angle

2021 ◽  
Vol 28 (1) ◽  
pp. 119-133
Author(s):  
Daisuke Miyazaki ◽  
Shuhei Hashimoto
Keyword(s):  
Photometric Stereo ◽  
Polarization Angle

Image segmentation through graph-based clustering from surface normals estimated by photometric stereo

2010 ◽  
Vol 46 (2) ◽  
pp. 134 ◽  
Author(s):  
C. Julià ◽  
R. Moreno ◽  
D. Puig ◽  
M.A. Garcia
Keyword(s):  
Image Segmentation ◽  
Photometric Stereo ◽  
Graph Based Clustering
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