scholarly journals First Demonstration of Calibrated Color Imaging by the CAOS Camera

Photonics ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 538
Author(s):  
Nabeel A. Riza ◽  
Nazim Ashraf
Keyword(s):  
Dynamic Range ◽  
Color Image ◽  
Linear Range ◽  
Data Generation ◽  
Cmos Camera ◽  
Color Target ◽  
Color Imaging ◽  
Full Spectrum ◽  
Mean Values ◽  
Cmos Sensor

The Coded Access Optical Sensor (CAOS) camera is a novel, single unit, full spectrum (UV to short-wave IR bands), linear, high dynamic range (HDR) camera. In this paper, calibrated color target imaging using the CAOS camera and a comparison to a commercial HDR CMOS camera is demonstrated for the first time. The first experiment using a calibrated color check chart indicates that although the CMOS sensor-based camera has an 87 dB manufacturer-specified HDR range, unrestricted usage of this CMOS camera’s output range greatly fails quality color recovery. On the other hand, the intrinsically linear full dynamic range operation CAOS camera color image recovery generally matches the restricted linear-mode commercial CMOS sensor-based camera recovery for the presented 39.5 dB non-HDR target that also matches the near 40 dB linear camera response function (CRF) range of the CMOS camera. Specifically, compared to the color checker chart manufacturer provided XYZ values for the calibrated target, percentage XYZ mean errors of 8.3% and 10.9% are achieved for the restricted linear range CMOS camera and CAOS camera, respectively. An alternate color camera assessment gives CIE ΔE00 mean values of 4.59 and 5.7 for the restricted linear range CMOS camera and CAOS camera, respectively. Unlike the CMOS camera lens optics and its photo-detection electronics, no special linear response optics and photo-detector designs were used for the experimental CAOS camera, nevertheless, a good and equivalent color recovery was achieved. Given the limited HDR linear range capabilities of a CMOS camera and the intrinsically wide linear HDR capability of a CAOS camera, a combined CAOS-CMOS mode of the CAOS smart camera is prudent and can empower HDR color imaging. Applications for such a hybrid camera includes still photography imaging, especially for quantitative imaging of biological samples, valuable artworks and archaeological artefacts that require authentic color data generation for reliable medical decisions as well as forgery preventing verifications.

Solar Limb Darkening Color Imaging of the Sun with the Extreme Brightness Capability CAOS Camera

2020 ◽  
Vol 2020 (1) ◽  
pp. 69-73
Author(s):  
Nabeel A. Riza ◽  
Mohsin A. Mazhar ◽  
Nazim Ashraf
Keyword(s):  
Image Data ◽  
Solar Limb ◽  
Integration Time ◽  
The Sun ◽  
Cmos Camera ◽  
Full Spectrum ◽  
Optical Attenuation ◽  
Cmos Sensor ◽  
Small Factor ◽  
Limb Darkening

Experimentally demonstrated for the first time is Coded Access Optical Sensor (CAOS) camera-based imaging of the Sun. Only by using both the shortest 0.029 ms integration time of the scientific CMOS sensor and a very large factor of 10,000 optical attenuation at the entrance of the CMOS camera, one is able to produce the desired unsaturated image of the Sun. In sharp contrast, a small factor of 3.2 optical attenuation is required over a much smaller single photo-detector zone of the CAOS camera to capture the unsaturated Sun image, including color images obtained using red, green, and blue filters. Image data processing shows that both the CMOS camera and CAOS camera show similar Sun limb darkening measurements consistent with prior-art works. The CAOS camera empowers optically and operationally efficient full spectrum (e. g., 350 nm to 2700 nm) imaging of bright heavenly bodies in space, with the potential for creating impact for solar energy farms, space navigation, space exploration and astronomical science.

scholarly journals RESEARCH OF DIGITAL CAMERA DYNAMIC RANGE ON THE IMAGING PROCESSING BASIS

2017 ◽  
Vol 8 (3) ◽  
pp. 271-278
Author(s):  
M Sutkowski ◽  
Ya. N. Saukova
Keyword(s):  
Dynamic Range ◽  
Digital Camera ◽  
Measuring Channel ◽  
Blue Color ◽  
Lower And Upper Bounds ◽  
Color Target ◽  
Color Channel ◽  
Imaging Processing ◽  
Colorimetric Measurements ◽  
Target Sets

Digital images provide to determine photometric and colorimetric properties of objects subject to validation all elements of a measuring channel (digital camera, software, display) and solve the problem of their limited dynamic ranges. The aim of the study was to explore the dynamic range of a digital camera for use in photometric and colorimetric measurements.The Laboratory of Photonics at the Institute of Microelectronics and Optoelectronics (Warsaw Technical University, Poland) conducted a comparative experiment to determine the threshold of sensitivity, linearity and range of application the digital camera. Color target sets with certified brightness and chromaticity were created at the terminals and recorded with a digital camera with different exposure times. The authors propose a method to extend the dynamic range of a digital camera for red, green and blue color channel of intensities by pairing the calibration dependencies, and determine the true brightness and color of a point on the object by calculation.Calibration dependencies (triads) of digital camera for red, green and blue color channels intensities were constructed. These dependences allow determining lower and upper bounds of the dynamic range. Each triad has a form of the hysteresis loop. The experiment showed that the accuracy of this method is ± 3–5 %. 

scholarly journals Monolithic CMOS sensor platform featuring an array of 9’216 carbon-nanotube-sensor elements and low-noise, wide-bandwidth and wide-dynamic-range readout circuitry

2019 ◽  
Vol 279 ◽  
pp. 255-266 ◽  
Author(s):  
Alexandra Dudina ◽  
Florent Seichepine ◽  
Yihui Chen ◽  
Alexander Stettler ◽  
Andreas Hierlemann ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Dynamic Range ◽  
Low Noise ◽  
Wide Dynamic Range ◽  
Wide Bandwidth ◽  
Sensor Platform ◽  
Cmos Sensor

Narrow-Band k-Distribution Database for Atomic Radiation in Hypersonic Nonequilibrium Flows

2009 ◽  
Author(s):  
Ankit Bansal ◽  
Michael F. Modest ◽  
Deborah Levin
Keyword(s):  
Narrow Band ◽  
Distribution Data ◽  
Nonequilibrium Flow ◽  
Data Generation ◽  
Full Spectrum ◽  
Important Species ◽  
Radiative Fluxes ◽  
Cpu Time ◽  
Nonequilibrium Flows ◽  
The Cost

Full-spectrum k-distribution (FSK) and multi-group FSK approaches make it possible to evaluate radiative fluxes at a fraction of the cost needed for line-by-line calculations. However, the required k-distributions need to be assembled from accurate absorption coefficient data for each flow condition, which is computationally expensive. An accurate and compact narrow-band k-distribution database has been developed for the most important species encountered in hypersonic nonequilibrium flow. The database allows users to calculate desired full-spectrum k-distributions through look-up and interpolation. Strategies for k-distribution data generation are outlined. The accuracy of the database is tested by comparing narrow-band mean absorption coefficients and narrow-band emissivities with those obtained from line-by-line calculations. Application of the database to construct full-spectrum k-distributions accurately and efficiently is discussed, and results from a number of heat transfer calculations and cpu-time studies are presented.

scholarly journals Dosimetry and Calorimetry Performance of a Scientific CMOS Camera for Environmental Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5746
Author(s):  
Alexis Aguilar-Arevalo ◽  
Xavier Bertou ◽  
Carles Canet ◽  
Miguel Angel Cruz-Pérez ◽  
Alexander Deisting ◽  
...  
Keyword(s):  
Drinking Water ◽  
World Health ◽  
X Rays ◽  
Cmos Camera ◽  
Silicon Sensors ◽  
Cmos Sensor ◽  
Detectable Rate ◽  
Measured Efficiency ◽  
Γ Rays ◽  
Health Organization

This paper explores the prospect of CMOS devices to assay lead in drinking water, using calorimetry. Lead occurs together with traces of radioisotopes, e.g., 210Pb, producing γ-emissions with energies ranging from 10 keV to several 100 keV when they decay; this range is detectable in silicon sensors. In this paper we test a CMOS camera (Oxford Instruments Neo 5.5) for its general performance as a detector of X-rays and low energy γ-rays and assess its sensitivity relative to the World Health Organization upper limit on lead in drinking water. Energies from 6 keV to 60 keV are examined. The CMOS camera has a linear energy response over this range and its energy resolution is for the most part slightly better than 2%. The Neo sCMOS is not sensitive to X-rays with energies below ∼10 keV. The smallest detectable rate is 40±3mHz, corresponding to an incident activity on the chip of 7±4Bq. The estimation of the incident activity sensitivity from the detected activity relies on geometric acceptance and the measured efficiency vs. energy. We report the efficiency measurement, which is 0.08(2)% (0.0011(2)%) at 26.3keV (59.5keV). Taking calorimetric information into account we measure a minimal detectable rate of 4±1mHz (1.5±1mHz) for 26.3keV (59.5keV) γ-rays, which corresponds to an incident activity of 1.0±6Bq (57±33Bq). Toy Monte Carlo and Geant4 simulations agree with these results. These results show this CMOS sensor is well-suited as a γ- and X-ray detector with sensitivity at the few to 100 ppb level for 210Pb in a sample.

Influence of full-spectrum lighting on blood pressure, heart rate and visual comfort on young adults

2020 ◽  
pp. 1420326X1989529
Author(s):  
Luyao Tang ◽  
Shaofan Chen ◽  
Muqing Liu ◽  
Chengyue Su
Keyword(s):  
Heart Rate ◽  
Pearson Correlation ◽  
Full Range ◽  
Solar Spectrum ◽  
Control Group ◽  
Testing Time ◽  
Visual Comfort ◽  
Full Spectrum ◽  
Mean Values ◽  
Pearson Correlation Test

This study examined the effects of lighting with different spectra on humans, as measured by mean arterial pressure, heart rate and visual comfort. Twenty subjects were recruited and tested under 12 different lighting spectra, produced by self-made luminaires respectively. In order to evaluate the shape similarity between the measured spectrum and the solar spectrum, a full-spectrum index E (0–100) was proposed. The higher the value of E, the closer the spectrum is to the full range of daylight. Groups whose E value is above 90 are classified as full-spectrum lighting groups. Subjects were required to maintain a calm mood during the 3-h testing time, and data were recorded every 20 min. Pearson correlation test and independent samples t-test were performed on the mean values. Results showed that heart rate and visual comfort were likely to be influenced by the spectrum. The higher the E is, the lower the average heart rate is and the higher the visual comfort is. Full-spectrum lighting group has a significantly lower heart rate and higher visual comfort than the control group.

scholarly journals Genetically-Encoded Yellow Fluorescent cAMP Indicator with an Expanded Dynamic Range for Dual-Color Imaging

PLoS ONE ◽  
2014 ◽  
Vol 9 (6) ◽  
pp. e100252 ◽  
Author(s):  
Haruki Odaka ◽  
Satoshi Arai ◽  
Takafumi Inoue ◽  
Tetsuya Kitaguchi
Keyword(s):  
Dynamic Range ◽  
Color Imaging ◽  
Dual Color

scholarly journals 60-dB-dynamic-range short-pulse measurement from an 8-bit CMOS camera

2007 ◽  
Vol 15 (9) ◽  
pp. 5439 ◽  
Author(s):  
D. Javorková ◽  
V. Bagnoud
Keyword(s):  
Dynamic Range ◽  
Short Pulse ◽  
Cmos Camera ◽  
Pulse Measurement

Large Area, Full-Color Image Sensors Made with Organic Semiconductors

1999 ◽  
Vol 558 ◽  
Author(s):  
G. Yu ◽  
G. Srdanov ◽  
J. Wang ◽  
A.J. Heeger
Keyword(s):  
Dark Current ◽  
Dynamic Range ◽  
Color Image ◽  
Sensor Arrays ◽  
Blue Color ◽  
Two Dimensional ◽  
Large Area ◽  
Full Color ◽  
Sensing Applications ◽  
Photodiode Arrays

ABSTRACTLarge area polymer photodiode arrays were designed and fabricated for full-color imaging applications. These sensor arrays are of high photosensitivity, low dark current, large dynamic range and fast response time. The red, green and blue color primaries were achieved by coupling a set of color filters with the polymer sensor pixels with broad response covering entire visible spectrum. Image recovery process from the pixel photocurrent data was developed, which is suitable generally to image arrays with power-law light intensity dependence and with finite pixel dark current. Large sensing length photodiode arrays (2.5”5”) were fabricated with pixel densities from 40 to 100 dot-per-inch. They were used as the sensing elements in page size document scanners. Voltage switchable polymer photodetectors were developed. Their photosensitivity can be switched on and off with external bias. These devices can be used as the sensing elements in x-y addressable two-dimensional sensor matrices. The high on/off switching ratio and high photocurrent/dark-current ratio allow such two-dimensional, passive photosensor matrices be used for image sensing applications.

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