Speckle time evolution characterization by the co-occurrence matrix analysis

Arizaga, Ricardo; Trivi, Marcelo; Rabal, H.

doi:10.1016/s0030-3992(99)00033-x

Cited by 167 publications

(86 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…where: M ij -normalized value of the co-occurrence matrix at the coordinates i and j; and, MOC ij -actual value in the co-occurrence matrix in line i and column j (Arizaga et al, 1999).…”

Section: Methodsmentioning

confidence: 99%

Relationship between biospeckle laser technique and firmness of Acrocomia aculeata fruits

Costa

Pinto

Braga

et al. 2017

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

A B S T R A C TKnowing the maturation of the Acrocomia aculeata (macaw palm) fruit is decisive for harvest to be performed when the fruit has a higher content and quality of oil. There are different approaches to monitor maturation and they can be classified as destructive and non-destructive. Variables obtained by optical instruments have been used to determine maturation stage. The present study evaluated the relationship between the biological activity measured by the optical technique of biospeckle laser and firmness, measured in the Acrocomia aculeata fruit pulp between the 41 st and 61 st week after flowering. The biological activity was quantified by biospeckle images, while the fruit pulp firmness was determined by digital penetrometer. Correlations between variables were evaluated during maturation and in the senescence of fruits. According to the results, significant correlation between biological activity and firmness was found for both evaluated conditions, demonstrating that biospeckle laser can be an effective non-invasive indicator of Acrocomia aculeate fruit maturation assisting in the determination of the moment of harvest.Relação entre a técnica do biospeckle laser e a firmeza dos frutos de Acrocomia aculeata R E S U M O O conhecimento da maturação dos frutos de Acrocomia aculeata (macaúba) é determinante para que a colheita seja realizada no momento em que o fruto apresente maior quantidade e qualidade de óleo. Existem diversas abordagens para monitorar a maturação, classificadas como destrutivas e não destrutivas. Variáveis obtidas por instrumentos óticos vêm sendo utilizadas para determinar, de forma não destrutiva, o estádio de maturação. Neste trabalho foram avaliadas a relação entre a atividade biológica mensurada pela técnica ótica do biospeckle laser e a firmeza da polpa dos frutos de Acrocomia aculeata entre as 41ª e 61ª semanas de maturação, após a florada. A atividade biológica foi quantificada a partir das imagens do biospeckle enquanto a firmeza da polpa dos frutos foi determinada por um penetrômetro digital. Foram avaliadas as correlações entre as variáveis durante a maturação e na senescência dos frutos. A partir dos resultados foi constatada correlação significativa entre atividade biológica e firmeza para as duas condições avaliadas demonstrando que o biospeckle laser pode ser um indicador eficiente não invasivo da maturação dos frutos da Acrocomia aculeata auxiliando na determinação do momento de colheita.

show abstract

“…where: M ij -normalized value of the co-occurrence matrix at the coordinates i and j; and, MOC ij -actual value in the co-occurrence matrix in line i and column j (Arizaga et al, 1999).…”

Section: Methodsmentioning

confidence: 99%

Relationship between biospeckle laser technique and firmness of Acrocomia aculeata fruits

Costa

Pinto

Braga

et al. 2017

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

show abstract

“…The breakpoint in numerical approaches can be attributed to the creation of a time history represented by a line of points during sample illumination (Oulamara;Tribillon;Duvernoy, 1989). Time history of a line of points was defined as Space-Time Speckle (STS) (Xu;Joenathan;Khorana, 1995) and as Time History of Speckle Pattern (THSP) (Arizaga;Trivi;Rabal, 1999). Multiple indexes are obtained by THSP, and many reports can be found in the literature.…”

Section: Analysis Of Biospeckle Laser Applicationsmentioning

confidence: 99%

When noise became information: State-of-the-art in biospeckle laser

Braga

Alves²

2017

Ciênc. agrotec.

View full text Add to dashboard Cite

Laser was presented to science and industry in the 1960s and shortly became a useful tool in many areas, with applications based on its multiple characteristics such as coherence of light, which presents a phenomenon known as interference pattern, or speckle, when beam returns from an illuminated surface. Despite great application of speckle pattern, its residual presence, for example, in interferometric approaches was considered as a noise, demanding filtering. However, grains themselves became information as their dynamic changes in time started to be linked to biological sample activity. Dynamic laser speckle has been since then a phenomenon widely used to monitor biological activities in many areas from agriculture to medicine. It is known as biospeckle laser (BSL) when adopted in biological material, with high sensitivity to follow very tiny movements in biological tissues, linked to changes in speckle provided by scatterer activities inside and outside cells. Since the 1970s, biospeckle laser usage follows a crescent technologic spiral where technological developments opened room for new applications, while new demands regarding biological monitoring forced the development of new methodologies. Therefore, potential adoption of the phenomenon as a sensor, for instance, in agricultural and medical processes, as well as constant offer of new devices provided new turns in the BSL technologic spiral and opened room for technique improvement. In this study, I present a short history of biospeckle laser (BSL) with applications and development associated with challenges regarding its usage in portable and accessible devices or even in commercial equipment. And the history was packed in a temporal diagram identifying the breakpoints responsible for improvements in the use of the technique.Index terms: Optical metrology; biosystems; challenges. RESUMOO laser foi apresentado à ciência e à indústria em 1960, e rapidamente tornou-se uma ferramenta útil à muitas áreas do conhecimento, que fazem uso de suas múltiplas características, como é o caso da coerência da luz, que é responsável pelo fenômeno conhecido como padrão de interferência, ou speckle; este padrão de interferência ocorre quando a luz retorna do material iluminado formando uma figura de interferência para o observador. Apesar da grande aplicação, a presença residual do padrão de speckle em abordagens interferométricas apresentavase como um ruído que demanda filtragem. Apesar da dificuldade em alguns casos, os grãos de speckle tornaram-se fonte de informação em situações dinâmicas, quando suas mudanças começaram a ser relacionadas à atividade do material biológico iluminado. Speckle laser dinâmico tornou-se o termo usado para denominar o fenômeno que passou a ser usado para monitorar a atividade biológica e não biológica em aplicações desde a agricultura até aquelas relacionadas à medicina. Este fenômeno também é conhecido como biospeckle laser (BSL), quando aplicado em material biológico, e com grande sensibilidade para seguir os menores movimentos ...

show abstract

“…The co-occurrence matrix was presented by [13], and expresses the number of the transitions of each THSP pixel with respect to its immediate neighbor. Equation (1) describes mathematically the co-occurrence matrix.…”

Section: Co-occurrence Matrixmentioning

confidence: 99%

Comparison between Fourier and Wavelets Transforms in Biospeckle Signals

Mariano¹,

Braga²,

Sáfadi³

et al. 2013

View full text Add to dashboard Cite

The dynamic speckle is a non-destructive optical technique that has been used as a tool for the characterization of the biological activity and several studies are conducted to obtain for more information about the correspondence of the observed phenomena and their expressions in the interference images. Analysis in the frequency domain has been considered as powerful alternative, and although there are works using Fourier transform in the frequency analysis of the biospeckle signals, the majority presents the wavelet transform as tool for spectral analysis. In turn, there are still doubts if the Fourier transform is not enough for the analysis of the biospeckle, which would enable the reduction of processing time since an operation is computationally simpler. In this context, the present study aims to compare the constituents' parts of the speckle signal according to Fourier and wavelet transforms for numerical analysis. The comparative analysis based on the absolute values of the differences technique (AVD) was carried out for performance evaluation of the Fourier and wavelet transforms, in which the speckle signals were decomposed spectrally and subsequently reconstructed with the elimination of specific frequency bands. Results showed that the wavelet transform allowed more information about signals constituents of the dynamic speckle, emphasizing its use instead of the Fourier transform, which in turn was restricted the situations in which the only interest is to know the spectral content of the data.

show abstract

Speckle time evolution characterization by the co-occurrence matrix analysis

Cited by 167 publications

References 7 publications

Relationship between biospeckle laser technique and firmness of Acrocomia aculeata fruits

Relationship between biospeckle laser technique and firmness of Acrocomia aculeata fruits

When noise became information: State-of-the-art in biospeckle laser

Comparison between Fourier and Wavelets Transforms in Biospeckle Signals

Contact Info

Product

Resources

About