Depth from spectrally-varying blurring detected by a snapshot narrow band multispectral imaging sensor

Autor: Wei Jiang, Dingrong Yi, Linghua Kong
Jazyk: angličtina
Rok vydání: 2019
Předmět:
optical images
image restoration
cameras
focal planes
image colour analysis
infrared imaging
aberrations
optical filters
image resolution
image sensors
lenses
commercial colour camera
depth measurement accuracy
cross-talk
narrow-band spectral images
snapshot multispectral imaging sensor
visible longitudinal chromatic aberration
snapshot narrow-band msi sensor
spectrally-varying-focal-depth
different narrow bands
apparently different planes
spectrally-varying depth
snm-msi sensor
depth ambiguity
focal plane
blurred image
cross talks
different spectral channels
focused spectral band shifts
increasing depth
longitudinal chromatic aberration optical lens
snapshot narrow band multispectral imaging sensor
estimating depth
spectrally-varying-amount-of-defocus
single image
Engineering (General). Civil engineering (General)
TA1-2040
Zdroj: The Journal of Engineering (2019)
Druh dokumentu: article
ISSN: 2051-3305
DOI: 10.1049/joe.2018.9062
Popis: There exists few reports in the literature aimed at estimating depth from the spectrally-varying-amount-of-defocus contained in a single image generally captured by a commercial colour camera. However, the colour camera can adversely affect the depth measurement accuracy, due to the cross-talk between its wide and overlapping red/green/blue channels. In this study, the authors propose an improved method to estimate depth from non-overlapping and narrow-band spectral images captured by a snapshot narrow-band multispectral imaging (SNB-MSI) sensor. An optical lens with visible longitudinal chromatic aberration is placed in front of the SNB-MSI sensor to enlarge the spectrally-varying-focal-depth so that spectral images corresponding to different narrow bands are focused on apparently different planes. This setting not only differentiates depth ambiguity on both sides of the focal plane, that is caused by two different depths lead to the same blurred image, but also prevents cross talks between different spectral channels. Preliminary experimental data show that the central wavelength of best focused spectral band shifts with increasing depth of the target. This suggests that it is feasible to dynamically measure the depth of the scene using the combination of a longitudinal chromatic aberration optical lens with a SNB-MSI sensor.
Databáze: Directory of Open Access Journals
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