Deinking evaluation using near infrared narrow band digital image analysis

TAPPI Journal ◽  
2016 ◽  
Vol 15 (8) ◽  
pp. 533-538
Author(s):  
ROLAND GONG ◽  
PAUL D. FLEMING ◽  
JOHN CAMERON ◽  
JAN PEKAROVIC
Keyword(s):  
Image Analysis ◽  
Optical Properties ◽  
Digital Image Analysis ◽  
Near Infrared ◽  
Visual Image ◽  
Infrared Light ◽  
Poor Correlation ◽  
Imaging Device ◽  
Digital Devices ◽  
Positive Results

The current deinking evaluation methods include visual image analysis (manual and digital) and optical reflectance (using the Kubelka-Munk equation). The mechanism of image analysis is simple: dark ink (mostly black) is isolated from the light background (fiber) and then captured visually or by digital devices. The image analysis methods have inherent limits, such as poor correlation with paper optical properties, and have large variances from sample to sample and side to side. In this paper, an innovative approach that employs a band of near infrared light and a digital imaging device was applied to address these limitations. This approach has advantages for isolating specks from backgrounds, obtaining high quality raw data, and significantly reducing the variances among the handsheets and their sides. By using the ink elimination equation derived from image analysis, reliable ink elimination rates were obtained that were well correlated with paper optical properties. This system was also applied to newspaper deinking evaluation with positive results.

Anisotropic optical properties of oriented silver nanorice and nanocarrots in stretched polymer films

Nanoscale ◽  
2015 ◽  
Vol 7 (19) ◽  
pp. 8858-8863 ◽  
Author(s):  
Xia Tong ◽  
Hongyan Liang ◽  
Yanlong Liu ◽  
Long Tan ◽  
Dongling Ma ◽  
...  
Keyword(s):  
Optical Properties ◽  
Polymer Films ◽  
Spectral Region ◽  
Near Infrared ◽  
Infrared Light ◽  
Near Infrared Light

Oriented arrays of silver nanorice or nanocarrots in stretched polymer films show polarization-dependent transmission of near-infrared light over a wide spectral region.

scholarly journals Biomedical optical properties of color light and near-infrared fluorescence separated-merged imager

2019 ◽  
Vol 12 (06) ◽  
pp. 1940001
Author(s):  
Rui Zhang ◽  
Ya-Zhou Xue ◽  
Xiao-Feng Yang
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Perioperative Period ◽  
Infrared Light ◽  
Agarose Gel ◽  
Near Infrared Fluorescence ◽  
Imaging Characteristics ◽  
Reflected Light ◽  
Wide Range

Objective: We study the biomedical optical properties of the color light and near-infrared fluorescence separated-merged imager. Materials and Methods: The color light and near-infrared fluorescence separated-merged imager can illuminate the visible light and the near-infrared light of [Formula: see text][Formula: see text]nm, receiving the reflected light and [Formula: see text][Formula: see text]nm near-infrared fluorescence, and display the color, fluorescence and merge image. ICG solution of different concentration, including standing time, was allocated to study the best imaging condition in vitro, and the depth of fluorescence penetration was studied with 5% agarose gel; the imaging characteristics of the imager was studied using SD rat; and then the SLNs tracing in 4 cases of penile carcinoma was performed. Results: When the concentration of ICG is 13.11[Formula: see text][Formula: see text]mol/L, the fluorescence intensity and the merge image are the best. The maximum depth of fluorescence imaging is 9[Formula: see text]mm in 5% agarose gel, while the bone has the greatest influence on it. The SLNs tracing shows that the imager can locate the SLNs in vitro, to achieve perioperative navigation during biopsy. Conclusion: There are many factors that affect the imaging effect, but the imaging effect of the imager meets the requirement of vision in a wide range, and can effectively trace the SLNs in perioperative period.

scholarly journals First Principles Study on the Electronic Structure and Optical Properties of La Doped YB6 Crystals

2021 ◽  
pp. X
Author(s):  
Hongbo TANG ◽  
Qiuyue LI ◽  
Jian ZHOU ◽  
Lihua XIAO ◽  
Ping PENG
Keyword(s):  
Density Functional Theory ◽  
Optical Properties ◽  
Electronic Structure ◽  
First Principles ◽  
Density Functional ◽  
Near Infrared ◽  
Infrared Light ◽  
First Principles Calculations ◽  
Functional Theory ◽  
La Doped

Received 03 January 2020; accepted 17 June 2020 We have investigated the optical properties of La (0, 0.125, 0.250) doped YB6 by means of first-principles calculations within the framework of density functional theory. It was found that electronic and optical properties of YB6 crystals varied remarkably when Y atoms were replaced with La atoms. Furthermore, with increasing content of La in YB6 crystals from 12.5 % to 25 % reflectivity and absorption coefficient of near infrared light decreased obviously, while the transmittance was enhanced.

Near-infrared tissue oximetry and digital image analysis: quantification of renal ischaemia in real time during partial nephrectomy

2011 ◽  
Vol 109 (2) ◽  
pp. 311-315 ◽  
Author(s):  
Arthur A. Caire ◽  
Xavier Alvarez ◽  
Sarah Conley ◽  
Alton Sartor ◽  
Benjamin R. Lee
Keyword(s):  
Image Analysis ◽  
Real Time ◽  
Partial Nephrectomy ◽  
Digital Image ◽  
Digital Image Analysis ◽  
Near Infrared ◽  
Renal Ischaemia ◽  
Tissue Oximetry

The Observation of the Vein Distribution of a Partial Toe-Transfer Flaps with a Short Vascular Pedicle

2018 ◽  
Vol 23 (02) ◽  
pp. 227-231 ◽  
Author(s):  
Koichi Kobayashi ◽  
Katsuyasu Fukasawa ◽  
Naoko Masuyama
Keyword(s):  
Near Infrared ◽  
Light Transmission ◽  
Infrared Light ◽  
Vascular Pedicle ◽  
Imaging Device ◽  
Dorsal Vein ◽  
The Mean ◽  
Web Space ◽  
High Consistency ◽  
Toe Transfer

Background: When performing partial toe-transfer flaps with a short vascular pedicle, as the flap becomes smaller, the likelihood of securing veins in the flap decreases. The purpose of this study was to clarify how frequently the partial toe-transfer flap with a short pedicle (free vascularized half-big toenail flap) contains veins and elucidate how frequently we can secure the veins with an artery via the first web space approach alone, using the Genial Viewer (a near-infrared light transmission imaging device). Methods: We observed the dorsal vein images of the bilateral big toes of 250 volunteers (male, n = 125; female, n = 125) using the device. We counted the total number of dorsal veins in the big toe, the veins that crossed the margin of the region equivalent to the half-big toenail flap, and the veins that branched off from the fibular side of the flap area. An unpaired Student’s t-test was used for the statistical analyses. Results: All of the dorsal big toes contained veins. The mean number of the veins was 2.3 (range, 1–4). Branched-off veins were observed in the area equivalent to the half-big toenail flap in 496 (99.2%) of the big toes, and the mean number of veins was 1.9 (range, 0–4). In four cases, the region contained no veins (unilaterally). Branched-off veins were observed in the first web space in 440 (88.0%) of the big toes, and the mean number of veins was 0.9 (range, 0–2). Conclusions: The present study indicated high consistency of the veins in partial toe-transfer flaps with a short vascular pedicle and the high possibility of harvesting a flap with only exposing the first web space. In addition, in most cases, the flap will include one or, at most, two veins in the first web space.

scholarly journals Tunable Transparency and NIR-Shielding Properties of Nanocrystalline Sodium Tungsten Bronzes

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 731
Author(s):  
Luomeng Chao ◽  
Changwei Sun ◽  
Jianyong Dou ◽  
Jiaxin Li ◽  
Jia Liu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Visible Region ◽  
Theoretical Data ◽  
Optical Filters ◽  
Dipole Approximation ◽  
Infrared Light ◽  
Sodium Tungsten ◽  
Shielding Properties ◽  
Heat Shielding

The NaxWO3 nanoparticles with different x were synthesized by a solvothermal method and the absorption behavior in visible and near-infrared light (NIR) region was studied. Well-crystallized nanoparticles with sizes of several tens of nanometers were confirmed by XRD, SEM and TEM methods. The absorption valley in visible region shifted from 555 nm to 514 nm and the corresponding absorption peak in NIR region shifted from 1733 nm to 1498 nm with the increasing x. In addition, the extinction behavior of NaxWO3 nanoparticles with higher x values were simulated by discrete dipole approximation method and results showed that the changing behavior of optical properties was in good agreement with the experimental results. The experimental and theoretical data indicate that the transparency and NIR-shielding properties of NaxWO3 nanoparticles in the visible and NIR region can be continuously adjusted by x value in the whole range of 0 < x < 1. These tunable optical properties of nanocrystalline NaxWO3 will expand its application in the fields of transparent heat-shielding materials or optical filters.

scholarly journals Brown carbon absorption in the red and near infrared spectral region

2016 ◽  
Author(s):  
A. Hoffer ◽  
A. Tóth ◽  
M. Pósfai ◽  
C. E. Chung ◽  
A. Gelencsér
Keyword(s):  
Optical Properties ◽  
Absorption Coefficient ◽  
Biomass Burning ◽  
Near Infrared ◽  
Global Network ◽  
Infrared Light ◽  
Brown Carbon ◽  
Carbonaceous Particles ◽  
Tar Balls ◽  
Infrared Spectral

Abstract. Black carbon aerosols have been conventionally assumed to be the only light-absorbing carbonaceous particles in the red and near-infrared spectral regions of solar radiation in the atmosphere. Here we report that contrary to the conventional belief tar balls (a specific type of organic aerosol particles from biomass burning) do absorb red and near infrared radiation significantly. Tar balls were produced in a laboratory experiment and their chemical and optical properties were measured. The absorption of these particles in the range between 470 and 950 nm was measured with an aethalometer, which is widely used to measure aerosol absorption in the field. We find that the absorption coefficient of tar balls at 880 nm exceeds 10 % of that at 470 nm. This substantial absorption of red and infrared light is also evident from a relatively low Ångström coefficient (and a significant mass absorption coefficient) of tar balls between 470 and 950 nm. Retrievals of aerosol column optical properties from a global network of surface stations over vast tropical areas dominated by biomass burning suggest that tar balls are the predominant light-absorbing species of organic aerosols over acetone/methanol-soluble BrC or HULIS. Our results also infer that the role of BC (including Diesel soot) in global climate forcing has likely been overestimated at the expense of brown carbon (BrC) from biomass burning.

Sign in / Sign up

Export Citation Format

Share Document