Spectral Filter Array For Multispectral Imaging
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| Author | : Chuan Ni |
| Publisher | : |
| Total Pages | : 94 |
| Release | : 2017 |
| Genre | : Light |
| ISBN | : |
Conventional multispectral imaging (MSI) is achieved by utilizing a spectral filter array--a set of predetermined narrowband spectral filters spatially multiplexed over an array of pixel sensors, which necessitates different filters to be designed for each application. In this dissertation, we propose a fundamentally different approach to multispectral imaging known as the Fourier Multispectral Imaging (Fourier MSI). The proposed method utilizes broadband multichroic filters with sinusoidally varying transmittance as a function of wavenumber. Unlike narrowband measurements, these sinusoidal filter measurements largely avoid aliasing that contaminates the spectra while undersampling with narrowband filters. Because of this, Fourier MSI provides a better recovery from discrete filter measurements and preserves the spectra features over the entire detecting wavelength range. We designed and fabricated these sinusoidal filters in both bulk and pixel formats, built up multispectral imaging system with the manufactured filters and made spectral imaging measurements with numerous targets like multispectral LED array, color checker, etc. The measurements show that spectral features such as reflection and absorption peaks are well preserved with this technique. Compared to multispectral systems based on narrowband filters, the Fourier MSI system generalizes well to applications where we lack a priori knowledge of the expected spectral content, which makes it a versatile technique for a wide range of multispectral imaging applications.
| Author | : Xin He |
| Publisher | : Springer Nature |
| Total Pages | : 122 |
| Release | : 2021-12-03 |
| Genre | : Science |
| ISBN | : 9811675155 |
This book presents how metasurfaces are exploited to develop new low-cost single sensor based multispectral cameras. Multispectral cameras extend the concept of conventional colour cameras to capture images with multiple color bands and with narrow spectral passbands. Images from a multispectral camera can extract significant amount of additional information that the human eye or a normal camera fails to capture and thus have important applications in precision agriculture, forestry, medicine, object identifications, and classifications. Conventional multispectral cameras are made up of multiple image sensors each externally fitted with a narrow passband wavelength filters, optics and multiple electronics. The need for multiple sensors for each band results in a number of problems such as being bulky, power hungry and suffering from image co-registration problems which in turn limits their wide usage. The above problems can be eliminated if a multispectral camera is developed using one single image sensor.
| Author | : |
| Publisher | : National Academies Press |
| Total Pages | : 254 |
| Release | : 2005-01-01 |
| Genre | : Technology & Engineering |
| ISBN | : 0309096251 |
Examines the application of scientific methods to the study and conservation of art and cultural properties. This work addresses scientific topics of broad interest, cutting across the boundaries of traditional disciplines and attracting up to 250 leadingresearchers in the field.
| Author | : Jie Jia |
| Publisher | : |
| Total Pages | : 72 |
| Release | : 2017 |
| Genre | : Fourier transform spectroscopy |
| ISBN | : |
There are many limitations to existing multispectral imaging modalities, such as speed, cost, range, spatial resolution, and application-specific system designs that lade generality. In this dissertation thesis, we propose a novel general-purpose multispectral imaging (MSI) modality. Central to this MSI design is a new type of spectral filters based not on the notion of narrowband filters, but instead using Fourier transform spectroscopy. Firstly, we verified the performance of our MSI system by simulation. Then, two initial prototypes based on this new idea are built and tested with real data capture. The results show that spectral features such as transmission and absorption peaks are preserved with this technique, proving that it is a more versatile technique compared to the narrowband filters for a wide range of multispectral imaging applications. We demonstrated single-shot multispectral imaging capability with a spectral filter array (SFA) pattern prototype designed to minimize the risk of spatial aliasing.
| Author | : Puneet Sharma |
| Publisher | : Springer |
| Total Pages | : 496 |
| Release | : 2017-05-22 |
| Genre | : Computers |
| ISBN | : 3319591290 |
The two-volume set LNCS 10269 and 10270 constitutes the refereed proceedings of the 20th Scandinavian Conference on Image Analysis, SCIA 2017, held in Tromsø, Norway, in June 2017. The 87 revised papers presented were carefully reviewed and selected from 133 submissions. The contributions are structured in topical sections on history of SCIA; motion analysis and 3D vision; pattern detection and recognition; machine learning; image processing and applications; feature extraction and segmentation; remote sensing; medical and biomedical image analysis; faces, gestures and multispectral analysis.
| Author | : Simone Bianco |
| Publisher | : Springer |
| Total Pages | : 284 |
| Release | : 2017-03-28 |
| Genre | : Computers |
| ISBN | : 3319560107 |
This book constitutes the refereed proceedings of the 6th Computational Color Imaging Workshop, CCIW 2017, held in Milano, Italy, in March 2017. The 23 full papers, including 4 tutorials and 3 invited papers, accepted were carefully reviewed and selected from 25 submissions. The papers are organized in topical sections on color image processing; color image quality; color in digital cultural heritage; spectral imaging; color characterization; color image analysis.
| Author | : Janis Spigulis |
| Publisher | : CRC Press |
| Total Pages | : 108 |
| Release | : 2024-09-18 |
| Genre | : Science |
| ISBN | : 104011508X |
This book provides insight into an unconventional modality of imaging where several spectral images are captured by a single snapshot under multi-laser illumination, ensuring high-speed imaging within extremely narrow spectral bands. This method has three distinct advantages, if compared to common commercial multispectral imaging systems - considerably improved spectral selectivity (or colour sensitivity) of imaging, avoided motion artefacts in the spectral image sets, and simpler/faster image processing as integrals over the spectral bands of imaging are replaced by numbers of the fixed working wavelengths. The basic principles and progress in this field are reviewed, focusing on applications for human skin diagnostics and printed forgery detection. The designs of ten different lab-developed prototypes that implement this method are described, along with results of their laboratory, clinical and/or forensic tests. This research leads to the development of new equipment and protocols for better skin diagnostics and the advanced detection of money, document, and artwork forgeries. Chapter 1 explains the basics of spectral imaging, including the main principles of multispectral and hyperspectral imaging. Chapter 2 introduces the snapshot multi-spectral-line imaging (SMSLI) method, focusing on lasers as multi-wavelength illumination sources. Chapter 3 describes multi-laser illumination designs while Chapter 4 presents main specifications of the lab-assembled prototype devices implementing such designs. Results of the test measurements confirming applicability of the developed solutions for analysis/mapping of colour pigments in clinical diagnostics and forgery detection are discussed in Chapters 5 and 6, respectively. This will be a valuable reference for laser and imaging professionals, photonics researchers and engineers, clinicians (dermatologists, plastic surgeons, oncologists), forensic experts, and students of physics, chemistry, biology, medicine, and engineering. Key Features: · Reviews techniques and applications of narrowband spectral imaging using multi-laser illumination. · Presents ten different prototypes for implementing the multi-spectral-line imaging method. · Discusses applications of spectral line imaging for human skin diagnostics and forgery detection.
| Author | : Anna Siri Luthman |
| Publisher | : Springer |
| Total Pages | : 153 |
| Release | : 2018-08-09 |
| Genre | : Science |
| ISBN | : 3319982559 |
This book describes the design, development, characterisation and application of two novel fluorescence imaging instruments based on spectrally resolved detector arrays (SRDAs). The simplest SRDA is the standard colour camera, which integrates a Bayer filter array of red, green and blue colour filters to replicate the colour sensing capability of the human eye. The SRDAs used in this book contain many more colours, ranging from 16 to over 100 colour channels. Using these compact, robust and low-cost detectors for biomedical applications opens new avenues of exploration that were not possible before, in particular, the use of spectral imaging in endoscopy. The work presented shows for the first time that not only can this new type of camera be used for fluorescence imaging, but also that it is able to resolve signals from up to 7 different dyes – a level of multiplexing not previously achieved in tissue with such compact and robust equipment. Furthermore, it reports the application of a bimodal endoscope performing both reflectance and fluorescence imaging using these cameras in an ex vivo pig oesophagus model.
| Author | : Ronian Siew |
| Publisher | : Independently Published |
| Total Pages | : 94 |
| Release | : 2018-07-08 |
| Genre | : |
| ISBN | : 9781717700469 |
Inopticalsolutions Notebooks are concise technical books that offer Ronian Siew's insights into specific topics in optics and optical systems. Wide-angle lenses possess a characteristic that off-axis ray bundles tend to "de-cluster" in front of the first element of the lens system, which enables an array of bandpass filters to be mounted there. This allows subareas across a wide field to be imaged through different spectral bands simultaneously, and through a shared aperture (i.e., the system's aperture stop). Ronian calls this "Multiple-Field Multispectral" (MFMS) imaging. One of the advantages of this approach to spectral imaging is that there is minimal spectral shift of the bandpass through each filter, as the central ray within ray bundles from each field is at normal incidence to the filter. This also results in minimal astigmatism introduced by the filter. This book discusses the optical design of MFMS imaging systems and suggests practical applications. Want a "feel" for the book's content? CUT AND PASTE the following link to preview first pages (note that the content in the printed book is in BLACK & WHITE): https: //drive.google.com/open?id=1399byNt5VANHuLWe-LDA_8CqfCDrKNg8
| Author | : Ayush Bhandari |
| Publisher | : MIT Press |
| Total Pages | : 482 |
| Release | : 2022-10-25 |
| Genre | : Technology & Engineering |
| ISBN | : 0262368374 |
A comprehensive and up-to-date textbook and reference for computational imaging, which combines vision, graphics, signal processing, and optics. Computational imaging involves the joint design of imaging hardware and computer algorithms to create novel imaging systems with unprecedented capabilities. In recent years such capabilities include cameras that operate at a trillion frames per second, microscopes that can see small viruses long thought to be optically irresolvable, and telescopes that capture images of black holes. This text offers a comprehensive and up-to-date introduction to this rapidly growing field, a convergence of vision, graphics, signal processing, and optics. It can be used as an instructional resource for computer imaging courses and as a reference for professionals. It covers the fundamentals of the field, current research and applications, and light transport techniques. The text first presents an imaging toolkit, including optics, image sensors, and illumination, and a computational toolkit, introducing modeling, mathematical tools, model-based inversion, data-driven inversion techniques, and hybrid inversion techniques. It then examines different modalities of light, focusing on the plenoptic function, which describes degrees of freedom of a light ray. Finally, the text outlines light transport techniques, describing imaging systems that obtain micron-scale 3D shape or optimize for noise-free imaging, optical computing, and non-line-of-sight imaging. Throughout, it discusses the use of computational imaging methods in a range of application areas, including smart phone photography, autonomous driving, and medical imaging. End-of-chapter exercises help put the material in context.
