scholarly journals Rigorous Co-Registration of KOMPSAT-3 Multispectral and Panchromatic Images for Pan-Sharpening Image Fusion

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 2100
Author(s):  
Changno Lee ◽  
Jaehong Oh
Keyword(s):  
Image Fusion ◽  
Visual Inspection ◽  
Camera System ◽  
Charge Coupled Device ◽  
Physical Sensor ◽  
The Difference ◽  
Terrain Elevation ◽  
Imaging Sensor ◽  
Sensor Modeling ◽  
Geometric Discrepancy

KOMPSAT-3, a Korean earth observing satellite, provides the panchromatic (PAN) band and four multispectral (MS) bands. They can be fused to obtain a pan-sharpened image of higher resolution in both the spectral and spatial domain, which is more informative and interpretative for visual inspection. In KOMPSAT-3 Advanced Earth Imaging Sensor System (AEISS) uni-focal camera system, the precise sensor alignment is a prerequisite for the fusion of MS and PAN images because MS and PAN Charge-Coupled Device (CCD) sensors are installed with certain offsets. In addition, exterior effects associated with the ephemeris and terrain elevation lead to the geometric discrepancy between MS and PAN images. Therefore, we propose a rigorous co-registration of KOMPSAT-3 MS and PAN images based on physical sensor modeling. We evaluated the impacts of CCD line offsets, ephemeris, and terrain elevation on the difference in image coordinates. The analysis enables precise co-registration modeling between MS and PAN images. An experiment with KOMPSAT-3 images produced negligible geometric discrepancy between MS and PAN images.

Detailed Performance Analysis of a 10kW Dish∕Stirling System

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
W. Reinalter ◽  
S. Ulmer ◽  
P. Heller ◽  
T. Rauch ◽  
J.-M. Gineste ◽  
...  
Keyword(s):  
Electric Energy ◽  
Optical Quality ◽  
Stirling Engine ◽  
Thermodynamic Efficiency ◽  
Ambient Conditions ◽  
Camera System ◽  
Charge Coupled Device ◽  
Mapping System ◽  
Conversion Unit ◽  
A Charge

The CNRS-Promes dish∕Stirling system was erected in Jun. 2004 as the last of three country reference units built in the “Envirodish” project. It represents the latest development step of the EuroDish system with many improved components. With a measured peak of 11kW electrical output power, it is also the best performing system so far. The measurement campaign to determine the optical and thermodynamic efficiency of the system is presented. The optical quality of the concentrator and the energy input to the power conversion unit was measured with a classical flux-mapping system using a Lambertian target and a charge coupled device camera system. An efficiency of the concentrator including the intercept losses of 74.4% could be defined for this particular system. For the thermodynamic analysis all the data necessary for a complete energy balance around the Stirling engine were measured or approximated by calculations. For the given ambient conditions during the tests, a Stirling engine efficiency of 39.4% could be measured. The overall efficiency for the conversion of solar to electric energy was 22.5%.

Accuracy and precision in stock separation of north-east Arctic and Norwegian coastal cod by otoliths - comparing readings, image analyses and a genetic method

2005 ◽  
Vol 56 (5) ◽  
pp. 753 ◽  
Author(s):  
Erik Berg ◽  
Tuula H. Sarvas ◽  
Alf Harbitz ◽  
Svein Erik Fevolden ◽  
Arnt Børre Salberg
Keyword(s):  
Visual Inspection ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Complete Separation ◽  
Arctic Cod ◽  
Genetic Method ◽  
North East ◽  
Accuracy And Precision ◽  
Growth Zones ◽  
The Difference

The distinction between north-east Arctic cod and Norwegian coastal cod, two major groups of Atlantic cod (Gadus morhua L.), has for many years been based on different distance and shape similarities between the two first translucent growth zones in the otoliths, subjectively decided by visual inspection in a binocular. To analyse the certainty of this technique, four independent readers have classified 263 cod otoliths in total from five different geographical areas. For three of the readers, between 82% and 89% of the classification results coincided with independent results based on genetic analyses. Further, 38 cod otoliths, where the readers were certain of the classification (21 north-east Arctic cod and 17 coastal cod) were classified by several image analysis methods. A complete separation was obtained by using the ratio of the circumferences of the two zones, providing a typical ratio of approximately 2 for coastal and 1.5 for north-east Arctic cod. The otolith method for separating the two types of cod has been considered adequately accurate in assessing the two stocks of cod. However, the method is sensitive to subjective interpretation, and action needs to be taken to minimise the difference in interpretation among otolith readers.

A Window Fourier-Domain Infrared Search System

1989 ◽  
Vol 43 (8) ◽  
pp. 1311-1316 ◽  
Author(s):  
Jeffrey W. Sherman ◽  
James A. de Haseth ◽  
David G. Cameron
Keyword(s):  
Visual Inspection ◽  
Fourier Domain ◽  
Search System ◽  
Matching Algorithm ◽  
The Difference ◽  
Difficult Cases ◽  
Absorbance Spectra ◽  
Infrared Search System ◽  
Magnitude Improvement ◽  
Infrared Data

A search system is presented that utilizes Fourier-domain infrared data. This system removes or nulls features from infrared absorbance spectra that are found to be dominant and similar in the spectra of interest. This method enhances spectral differences. An example of one such region that is commonly nulled is the C-H stretch region of the spectra. These bands occur in organic compounds and, while generally being quite strong, contribute little to differentiation between spectra. More than one region may be nulled with this system, and the regions are chosen by visual inspection of the spectra of interest. The nulled spectra are then transformed into the Fourier domain, where data in the region that is 55–155 points displaced from the centerburst are extracted and normalized. Finally, a complete library search is performed on the normalized Fourier-domain data. The actual matching algorithm uses a simple dot product calculation, and excellent search results are obtained. This method can be used to distinguish similar compounds that are not easily distinguished by other infrared search methods. In the most difficult cases, a minimum of two-orders-of-magnitude improvement in the difference in dot products is observed when the results of full bandpass spectra are compared with the results of spectra that had one or more regions nulled.

scholarly journals Hyperspectral and Multispectral Remote Sensing Image Fusion Based on Endmember Spatial Information

2020 ◽  
Vol 12 (6) ◽  
pp. 1009
Author(s):  
Xiaoxiao Feng ◽  
Luxiao He ◽  
Qimin Cheng ◽  
Xiaoyi Long ◽  
Yuxin Yuan
Keyword(s):  
Image Fusion ◽  
Spatial Resolution ◽  
Spectral Resolution ◽  
Spatial Information ◽  
Spectral Unmixing ◽  
High Spectral Resolution ◽  
Remote Sensing Image Fusion ◽  
Fusion Methods ◽  
Invariant Regions ◽  
The Difference

Hyperspectral (HS) images usually have high spectral resolution and low spatial resolution (LSR). However, multispectral (MS) images have high spatial resolution (HSR) and low spectral resolution. HS–MS image fusion technology can combine both advantages, which is beneficial for accurate feature classification. Nevertheless, heterogeneous sensors always have temporal differences between LSR-HS and HSR-MS images in the real cases, which means that the classical fusion methods cannot get effective results. For this problem, we present a fusion method via spectral unmixing and image mask. Considering the difference between the two images, we firstly extracted the endmembers and their corresponding positions from the invariant regions of LSR-HS images. Then we can get the endmembers of HSR-MS images based on the theory that HSR-MS images and LSR-HS images are the spectral and spatial degradation from HSR-HS images, respectively. The fusion image is obtained by two result matrices. Series experimental results on simulated and real datasets substantiated the effectiveness of our method both quantitatively and visually.

scholarly journals Using Sensor Graphs for Monitoring the Effect on the Performance of the OTAGO Exercise Program in Older Adults

Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 493
Author(s):  
Björn Friedrich ◽  
Carolin Lübbe ◽  
Enno-Edzard Steen ◽  
Jürgen Martin Bauer ◽  
Andreas Hein
Keyword(s):  
Older Adults ◽  
Pilot Study ◽  
Exercise Program ◽  
Exercise Programme ◽  
Control Group ◽  
Motion Sensors ◽  
Surrogate Variable ◽  
Physical Sensor ◽  
The Difference ◽  
Positive Effect

The OTAGO exercise programme is effective in decreasing the risk for falls of older adults. This research investigated if there is an indication that the OTAGO exercise programme has a positive effect on the capacity and as well as on the performance in mobility. We used the data of the 10-months observational OTAGO pilot study with 15 (m = 1, f = 14) (pre-)frail participants aged 84.60 y (SD: 5.57 y). Motion sensors were installed in the flats of the participants and used to monitor their activity as a surrogate variable for performance. We derived a weighted directed multigraph from the physical sensor network, subtracted the weights of one day from a baseline, and used the difference in percent to quantify the change in performance. Least squares was used to compute the overall progress of the intervention (n = 9) and the control group (n = 6). In accordance with previous studies, we found indication for a positive effect of the OTAGO program on the capacity in both groups. Moreover, we found indication that the OTAGO program reduces the decline in performance of older adults in daily living. However, it is too early to conclude causalities from our findings because the data was collected during a pilot study.

OPERATING RANGE RESPONSIVENESS DEFINITION OF LUMINESCENT SMART COATING BY RESULTS OF IMPACT DAMAGES PARAMETERS ULTRASONIC MEASUREMENTS

2020 ◽  
pp. 26-33
Author(s):  
S. A. Smotrova ◽  
V. I. Ivanov ◽  
A. V. Smotrov ◽  
A. N. Kuskova ◽  
Yu. V. Mantrova
Keyword(s):  
Visual Inspection ◽  
Impact Damage ◽  
Operating Range ◽  
Permissible Range ◽  
Additional Equipment ◽  
Smart Coatings ◽  
Smart Coating ◽  
The Difference ◽  
Definition Of ◽  
Impact Damages

One of the characteristic aircraft damages is impact by foreign object. In subsequent operation, the presence of impact damages to airframes made of polymer composite materials (PCM) leads to a violation of their structures and integrities. To avoid accidents it is necessary to identify and measure the parameters of such damages. The paper analyzes literature data, impact tests results and ultrasonic control of PCM samples. PCM samples represent plates. Dependences of PCM samples defect size on impact energy are revealed. It is shown that at energy of effect in a range 10…45 J damages with the linear sizes 25…70 mm are formed. The difference of the damages sizes on facing and turnaround surfaces of PCM samples is noted. The largest number of procedures in aviation is visual inspection with the naked eye or using any additional equipment. Its main disadvantage in relation to composite products is the fundamental inability to detect barely visible impact damage and internal defects that do not extend to the surface. The technology of impact damage detection using special impact -sensitive luminescent smart coatings with optical properties allows to improve the visual inspection procedure qualitatively. The result of the research is to define the permissible range of coating sensitivity. The luminescent smart coating operating range is determined: 10…20 J. Luminescent smart coating is developed for detection of barely visible impact damage on composite airframes.

scholarly journals Multi-View Optical Image Fusion and Reconstruction for Defogging without a Prior In-Plane

Photonics ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 454
Author(s):  
Yuru Huang ◽  
Yikun Liu ◽  
Haishan Liu ◽  
Yuyang Shui ◽  
Guanwen Zhao ◽  
...  
Keyword(s):  
Image Fusion ◽  
Large Field ◽  
Synthetic Image ◽  
Camera System ◽  
Single View ◽  
Imaging Reconstruction ◽  
Visible Object ◽  
Mobile Cameras ◽  
Potential Applicability ◽  
Structure Similarity

Image fusion and reconstruction from muldti-images taken by distributed or mobile cameras need accurate calibration to avoid image mismatching. This calibration process becomes difficult in fog when no clear nearby reference is available. In this work, the fusion of multi-view images taken in fog by two cameras fixed on a moving platform is realized. The positions and aiming directions of the cameras are determined by taking a close visible object as a reference. One camera with a large field of view (FOV) is applied to acquire images of a short-distance object which is still visible in fog. This reference is then adopted to the calibration of the camera system to determine the positions and pointing directions at each viewpoint. The extrinsic parameter matrices are obtained with these data, which are applied for the image fusion of distant images captured by another camera beyond visibility. The experimental verification was carried out in a fog chamber and the technique is shown to be valid for imaging reconstruction in fog without a prior in-plane. The synthetic image, accumulated and averaged by ten-view images, is shown to perform potential applicability for fog removal. The enhanced structure similarity is discussed and compared in detail with conventional single-view defogging techniques.

scholarly journals Benefit of Watching a Live Visual Inspection of the Cervix With Acetic Acid and Lugol Iodine on Women’s Anxiety: Randomized Controlled Trial of an Educational Intervention Conducted in a Low-Resource Setting (Preprint)

2018 ◽  
Author(s):  
Roxane Camail ◽  
Bruno Kenfack ◽  
Phuong Lien Tran ◽  
Manuela Viviano ◽  
Pierre-Marie Tebeu ◽  
...  
Keyword(s):  
Cervical Cancer ◽  
Acetic Acid ◽  
Cancer Screening ◽  
Cervical Cancer Screening ◽  
Visual Inspection ◽  
Emotional State ◽  
Pelvic Examination ◽  
Before And After ◽  
The Mean ◽  
The Difference

BACKGROUND Women undergoing pelvic examination for cervical cancer screening can experience periprocedural anxiety. OBJECTIVE The aim of this study was to assess the anxiety level experienced by women undergoing a visual inspection with acetic acid and Lugol iodine (VIA and VILI) examination, with or without watching the procedure on a digital screen. METHODS This prospective randomized study took place in the district of Dschang, Cameroon. A previous cervical cancer screening campaign tested women aged between 30 and 49 years for human papillomavirus (HPV). HPV-positive women were invited for the 12-month follow-up control visit, including a VIA/VILI examination. During that visit, we recruited women to participate in this study. Before the examination, participants were randomized in a 1:1 ratio to a control group (CG) and an intervention group (IG). Women in both groups underwent a pelvic examination and were verbally informed about the steps undertaken during the gynecological examination. The IG could also watch it live on a tablet screen. Women’s anxiety was assessed before and immediately after the examination, using the Spielberger State-Trait Anxiety Inventory (STAI). A paired t test was used to compare the mean STAI score for each question before and after VIA/VILI while a nonpaired, 2-sided t test was used to compare the mean differences of the STAI score between the 2 study groups. RESULTS A total of 122 women were randomized in the study; 4 of them were excluded as they did not undergo the pelvic examination, did not answer to the second STAI questionnaire because of personal reasons, or the cervix could not be properly visualized. Thus, the final sample size consisted of 118 patients of whom 58 women were assigned to the CG and 60 to the IG. The mean age was 39.1 (SD 5.2) years. Before the examination, the mean (SD) STAI score was 33.6 (SD 10.9) in the CG and 36.4 (SD 11.8) in the IG (P=.17). The STAI score after pelvic examination was significantly reduced for both groups (CG: 29.3 [SD 11.2]; IG: 28.5 [SD 12.0]). Overall, the difference of the STAI scores before and after the pelvic examination was lower in the CG (4.2 [SD 9.0]) than in the IG (7.9 [SD 14.3]), although the difference was not significant (P=.10). However, the women’s emotional state, such as I feel secure and I feel strained, was improved in the IG as compared with the CG (CG: P=.01; IG: P=.007). CONCLUSIONS Watching the VIA/VILI procedure in real time improved the women’s emotional state but did not reduce the periprocedural anxiety measured by the STAI score. Furthermore, larger studies should assess women’s satisfaction with watching their pelvic examination in real time to determine whether this tool could be included in VIA/VILI routine practice. CLINICALTRIAL ClinicalTrials.gov NCT02945111; http://clinicaltrials.gov/ct2/show/NCT02945111

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