Survey of supervised classification techniques for hyperspectral images

Sensor Review ◽  
2017 ◽  
Vol 37 (3) ◽  
pp. 371-382 ◽  
Author(s):  
Qingchen Qiu ◽  
Xuelian Wu ◽  
Zhi Liu ◽  
Bo Tang ◽  
Yuefeng Zhao ◽  
...  
Keyword(s):  
Design Methodology ◽  
Supervised Classification ◽  
Hyperspectral Image ◽  
State Of The Art ◽  
Hyperspectral Data ◽  
Hyperspectral Images ◽  
Content Type ◽  
The Core ◽  
Hyperspectral Classification ◽  
Development Tendency

Purpose This paper aims to provide a framework of the supervised hyperspectral classification, to study the traditional flowchart of hyperspectral image (HIS) analysis and processing. HSI technology has been proposed for many years, and the applications of this technology were promoted by technical advancements. Design/methodology/approach First, the properties and current situation of hyperspectral technology are summarized. Then, this paper introduces a series of common classification approaches. In addition, a comparison of different classification approaches on real hyperspectral data is conducted. Finally, this survey presents a discussion on the classification results and points out the classification development tendency. Findings The core of this survey is to review of the state of the art of the classification for hyperspectral images, to study the performance and efficiency of certain implementation measures and to point out the challenges still exist. Originality value The study categorized the supervised classification for hyperspectral images, demonstrated the comparisons among these methods and pointed out the challenges that still exist.

An effective hyperspectral image retrieval method using integrated spectral and textural features

Sensor Review ◽  
2015 ◽  
Vol 35 (3) ◽  
pp. 274-281 ◽  
Author(s):  
Zhenfeng Shao ◽  
Weixun Zhou ◽  
Qimin Cheng ◽  
Chunyuan Diao ◽  
Lei Zhang
Keyword(s):  
Design Methodology ◽  
Spatial Information ◽  
Hyperspectral Image ◽  
Hyperspectral Data ◽  
Textural Features ◽  
Washington Dc ◽  
Query Image ◽  
Retrieval Method ◽  
Content Type ◽  
Similar Images

Purpose – The purpose of this paper is to improve the retrieval results of hyperspectral image by integrating both spectral and textural features. For this purpose, an improved multiscale opponent representation for hyperspectral texture is proposed to represent the spatial information of the hyperspectral scene. Design/methodology/approach – In the presented approach, end-member signatures are extracted as spectral features by means of the widely used end-member induction algorithm N-FINDR, and the improved multiscale opponent representation is extracted from the first three principal components of the hyperspectral data based on Gabor filters. Then, the combination similarity between query image and other images in the database is calculated, and the first k more similar images are returned in descending order of the combination similarity. Findings – Some experiments are calculated using the airborne hyperspectral data of Washington DC Mall. According to the experimental results, the proposed method improves the retrieval results, especially for image categories that have regular textural structures. Originality/value – The paper presents an effective retrieval method for hyperspectral images.

scholarly journals Cluster-Wise Weighted NMF for Hyperspectral Images Unmixing with Imbalanced Data

2021 ◽  
Vol 13 (2) ◽  
pp. 268
Author(s):  
Xiaochen Lv ◽  
Wenhong Wang ◽  
Hongfu Liu
Keyword(s):  
Spatial Information ◽  
Hyperspectral Image ◽  
Imbalanced Data ◽  
Reconstruction Error ◽  
Hyperspectral Data ◽  
Weight Matrix ◽  
Hyperspectral Images ◽  
Mixed Data ◽  
Sparsity Constraints ◽  
Additional Constraints

Hyperspectral unmixing is an important technique for analyzing remote sensing images which aims to obtain a collection of endmembers and their corresponding abundances. In recent years, non-negative matrix factorization (NMF) has received extensive attention due to its good adaptability for mixed data with different degrees. The majority of existing NMF-based unmixing methods are developed by incorporating additional constraints into the standard NMF based on the spectral and spatial information of hyperspectral images. However, they neglect to exploit the nature of imbalanced pixels included in the data, which may cause the pixels mixed with imbalanced endmembers to be ignored, and thus the imbalanced endmembers generally cannot be accurately estimated due to the statistical property of NMF. To exploit the information of imbalanced samples in hyperspectral data during the unmixing procedure, in this paper, a cluster-wise weighted NMF (CW-NMF) method for the unmixing of hyperspectral images with imbalanced data is proposed. Specifically, based on the result of clustering conducted on the hyperspectral image, we construct a weight matrix and introduce it into the model of standard NMF. The proposed weight matrix can provide an appropriate weight value to the reconstruction error between each original pixel and the reconstructed pixel in the unmixing procedure. In this way, the adverse effect of imbalanced samples on the statistical accuracy of NMF is expected to be reduced by assigning larger weight values to the pixels concerning imbalanced endmembers and giving smaller weight values to the pixels mixed by majority endmembers. Besides, we extend the proposed CW-NMF by introducing the sparsity constraints of abundance and graph-based regularization, respectively. The experimental results on both synthetic and real hyperspectral data have been reported, and the effectiveness of our proposed methods has been demonstrated by comparing them with several state-of-the-art methods.

Information processing by elderly consumers: a five-decade review

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Gianluigi Guido ◽  
Marco Pichierri ◽  
Cristian Rizzo ◽  
Verdiana Chieffi ◽  
George Moschis
Keyword(s):  
Information Processing ◽  
Design Methodology ◽  
State Of The Art ◽  
Relevant Literature ◽  
Academic Research ◽  
The Elderly ◽  
Marketing Strategies ◽  
Content Type ◽  
Processing Activity ◽  
Elderly Consumers

Purpose The purpose of this study is to review scholarly research on elderly consumers’ information processing and suggest implications for services marketing. Design/methodology/approach The review encompasses a five-decade period (1970–2018) of academic research and presents relevant literature in four main areas related to information processing: sensation, attention, interpretation and memory. Findings The study illustrates how each of the aforementioned phases of the information processing activity may affect how elderly individuals buy and consume products and services, emphasizing the need for a better comprehension of the elderly to develop effectual marketing strategies. Originality/value The study provides readers with detailed state-of-the-art knowledge about older consumers’ information processing, offering a comprehensive review of academic research that companies can use to improve the effectiveness of their marketing efforts that target the elderly market.

Learning from criticisms of quality management

2015 ◽  
Vol 7 (2/3) ◽  
pp. 201-216 ◽  
Author(s):  
Gilles Barouch ◽  
Stéphane Kleinhans
Keyword(s):  
Quality Management ◽  
Literature Review ◽  
Design Methodology ◽  
State Of The Art ◽  
Senior Managers ◽  
Content Type ◽  
Adequate Response ◽  
Academic Results

Purpose – This paper aims at summing up the main criticisms concerning quality management (QM) in order to address them through objective arguments or extant research. Since its diffusion in the Occident in the 70s, QM gained as much approvals as criticisms. Therefore, with 40 years distance, it seems useful to sum up the main criticisms addressed to QM, to present a synthesis of the answers provided by researchers to these criticisms and to propose extant research when it appears that some criticisms have not received yet the adequate response. Design/methodology/approach – This paper is based on a literature review. Findings – This paper comes up with a list of the main criticisms addressed to QM. Then, main causes of criticisms are identified: ignorance of QM, confusion concerning QM definitions and theory and misuse of QM by senior managers. At last, QM organizational solutions are proposed which answer most expressed criticisms. Extant research tracks are considered for those relevant criticisms which have not been sufficiently addressed until now. Research limitations/implications – Further research will look into depicting a survey conducted among QM professionals concerning QM criticisms in their organization and confronting them to these academic results. Originality/value – This paper actualizes and completes Giroux and Landry’s (1998) article which dealt extensively with QM criticisms. Professionals will find in this paper answers to most criticisms against QM and a better understanding of the present limits of this discipline. Researchers will be provided with a state of the art concerning this sensitive topic, allowing them to go deeper in the fields that require special attention.

Who is a “Senior”? Looking for a definition in the healthcare system

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Monica Consolandi
Keyword(s):  
Quality Of Life ◽  
Health Care ◽  
Healthcare System ◽  
Health Care System ◽  
Design Methodology ◽  
Social Role ◽  
Content Type ◽  
The Core ◽  
Starting Point

Purpose Seniors are nowadays at the core of important reflections to understand both how to ensure them a proper quality of life and better recognize their social role, providing them services and proper health care to value them as persons and resources. This paper aims to find a through definition about who is a senior, in the author’s opinion the starting point to help them flourishing. Design/methodology/approach As an example of definitions, an online dictionary and two geriatric text-books are quoted, highlighting qualities and rights referred to seniors especially in the delicate context of the health-care system. Findings The lack of a commonly shared perspective on this delicate kind of patient entails the difficulty to reach a coherent and satisfying definition about who a senior is. Originality/value The lack of a commonly shared definition leads to inevitable misunderstandings and could explain the arduousness of considering seniors in all their aspects. Further investigations are suggested.

Outsourcing in startups

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Fernanda Kalil Steinbruch ◽  
Bernardo Soares Fernandes ◽  
Leandro da Silva Nascimento ◽  
Paulo Antônio Zawislak
Keyword(s):  
Design Methodology ◽  
Development Stage ◽  
Attractive Alternative ◽  
Content Type ◽  
Core Business ◽  
Secondary Sources ◽  
The Core ◽  
Management Literature ◽  
Structure Knowledge

Purpose The purpose of this paper is to identify the main activities that startups outsource and the elements involved in outsourcing decisions. Design/methodology/approach A multi-case study composed of Brazilian startups was conducted. Data through interviews and secondary sources were obtained. Two groups of startups were considered and analyzed comparatively: startups in the development stage and in the sales stage. Findings The findings show that even though the literature suggests that the core business should not be outsourced, some startups do have to outsource this kind of activity. That was the main difference found between startups in the sales stage and in the development stage: the former group has a solid structure, knowledge and resources, so they can keep the core business inside the firm; whereas the latter group has little experience, scarce knowledge and resources, making outsourcing a more attractive alternative. Originality/value Theoretically, this paper approaches a perspective underexplored in the innovation and management literature: outsourcing in startups. It highlights how outsourcing, as a decision between making and buying, can help startups to improve success potential. In practice, this paper discusses and demonstrates why and what can be outsourced by startups in the development and in the sales stages to overcome their limitations and, consequently, achieve better innovative results.

Corporate social responsibility practices developed by Mexican family and non-family businesses

2019 ◽  
Vol 9 (1) ◽  
pp. 40-53 ◽  
Author(s):  
José Luis Esparza Aguilar
Keyword(s):  
Design Methodology ◽  
State Of The Art ◽  
Family Businesses ◽  
University Education ◽  
Quintana Roo ◽  
Southern State ◽  
Content Type ◽  
Mexican Family ◽  
Corporate Social ◽  
Practical Implications

Purpose The purpose of this paper is to identify the CSR practices developed by Mexican family and non-family MSMEs. The study also aims to compare the CSR practices carried out by family and non-family businesses in a country with an emergent economy. Design/methodology/approach The paper opted for an exploratory study using a sample of 384 businesses was selected in the southern state of Quintana Roo, Mexico, distributed in 245 family and 139 non-family businesses and a questionnaire was applied directly to the managers/owners. Findings The results show that family MSMEs develop CSR practices to a higher extent than non-family ones, mainly on environment and societal dimensions. In addition, CSR practices in family-owned enterprises develop to a higher extent when the manager/owner has more years of experience in the business, has a higher university education and the size of the business is larger. Research limitations/implications The study was developed exclusively with a MSMEs sample with a scope only on the southern part of Quintana Roo, Mexico; the shortage of business databases and the stratification of businesses based exclusively on the number of employees. This work presents information that contributes to the state of the art, broadening the existing literature related to CSR in businesses of a country with an emergent economy and an environment where the tourism and commercial sectors predominate. Practical implications This paper provides information to government institutions for the establishment of public policies targeted for an increase of CSR activities by businesses in the area. Manager and/or owners can understand the importance of implementing CSR activities within the business as a competitive strategy. It is also important for universities, professors/researchers and for all interested parties. Originality/value This paper provides theoretical and empirical evidence about CSR practices carried out among family and non-family MSMEs in an emergent economy.

Website traffic measurement and rankings: competitive intelligence tools examination

2018 ◽  
Vol 14 (4) ◽  
pp. 423-437 ◽  
Author(s):  
David Prantl ◽  
Martin Prantl
Keyword(s):  
Design Methodology ◽  
State Of The Art ◽  
Competitive Intelligence ◽  
Data Sets ◽  
Traffic Data ◽  
Content Type ◽  
Traffic Measurement ◽  
Data Estimation ◽  
Research Studies

PurposeThe purpose of this paper is to examine and verify the competitive intelligence tools Alexa and SimilarWeb, which are broadly used for website traffic data estimation. Tested tools belong to the state of the art in this area.Design/methodology/approachThe authors use quantitative approach. Research was conducted on a sample of Czech websites for which there are accurate traffic data values, against which the other data sets (less accurate) provided by Alexa and SimilarWeb will be compared.FindingsThe results show that neither tool can accurately determine the ranking of websites on the internet. However, it is possible to approximately determine the significance of a particular website. These results are useful for another research studies which use data from Alexa or SimilarWeb. Moreover, the results show that it is still not possible to accurately estimate website traffic of any website in the world.Research limitations/implicationsThe limitation of the research lies in the fact that it was conducted solely in the Czech market.Originality/valueSignificant amount of research studies use data sets provided by Alexa and SimilarWeb. However, none of these research studies focus on the quality of the website traffic data acquired by Alexa or SimilarWeb, nor do any of them refer to other studies that would deal with this issue. Furthermore, authors describe approaches to measuring website traffic and based on the analysis, the possible usability of these methods is discussed.

scholarly journals Accountability reporting objectives of Māori organizations

2018 ◽  
Vol 30 (4) ◽  
pp. 433-443 ◽  
Author(s):  
Russell Craig ◽  
Rawiri Taonui ◽  
Susan Wild ◽  
Lũcia Lima Rodrigues
Keyword(s):  
New Zealand ◽  
Design Methodology ◽  
Indigenous Communities ◽  
Core Values ◽  
Annual Reports ◽  
Content Type ◽  
Cultural Activities ◽  
The Core ◽  
Regional Associations

Purpose This paper aims to highlight the accountability reporting objectives of four Māori-controlled organizations. The examples cited reflect the core values of the indigenous Māori people of New Zealand (Aotearoa) and help demonstrate how these values are manifest in the accountability reporting of Māori-controlled organizations. Design/methodology/approach Narrative sections of ten annual reports of two small and two large Maori organizations, drawn variously from their financial years ending in the calendar years 2009 to 2014, are read closely. These organizations represent diverse tribal and regional associations in terms of size, scope and structure; and in terms of the business, social and cultural activities they pursue. Findings Three core Māori values are identified: spirituality (wairuatanga); intergenerationalism and restoration (whakapapa); and governance, leadership and respect (mana and rangatiratanga). The commitment to these values and the way this commitment is reflected in accountability reports of Maori organizations, is presented. Originality/value The examples provided, and the associated discussion, should help inform reporting initiatives of organizations that are seeking better accountability in terms of their long-term engagement with indigenous communities, the environment and broader society.

scholarly journals Re-orienting the paradigm: path dependence in FDI theory and the emerging multinationals

2019 ◽  
Vol 14 (1) ◽  
pp. 51-69 ◽  
Author(s):  
Jan Knoerich
Keyword(s):  
Emerging Economies ◽  
Direct Investment ◽  
Design Methodology ◽  
Path Dependence ◽  
Theoretical Perspective ◽  
Multinational Enterprise ◽  
Content Type ◽  
The Core ◽  
Emerging Multinationals ◽  
Path Dependent

Purpose The purpose of this paper is to analyze how path dependence in the evolution of major theories of foreign direct investment (FDI) locked in a theoretical perspective of the multinational enterprise that focused on asset-exploitation. This perspective is challenged by recent contradicting observations of multinationals from China and other emerging economies. A decisive re-orientation of FDI theory is proposed as a way forward to resolve this tension. Design/methodology/approach Placing FDI theories into the context of FDI patterns prevailing at the time they were developed, Thomas Kuhn’s framework on the evolution of scientific knowledge is employed to track how the mainstream FDI theory emerged, went through a period of normal science and then approached a crisis of science in this field. Findings The evolution of FDI theory is strongly path-dependent, which made it difficult for theory to effectively incorporate new conceptual discoveries and empirical findings about the nature of FDI activity. Originality/value FDI theory would benefit from a full re-orientation to a demand-oriented perspective which places the pursuit of advantages, assets, resources, etc., at the core of the theory. Such a change is implicit in many recent theoretical advances and would assure theory is generalizable to all types of FDI.

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