Neuro-fuzzy model based on digital images for the monitoring of coffee bean color during roasting in a spouted bed

•Coffee color during roasting in a spouted bed was assessed by an ANFIS model.•The input variables were color parameters obtained from digital images.•For monitoring in the process line, we constructed an image-capture device.•The model's goodness of fit was assessed by R2, RMSE and SRIC.•The m...

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Published inExpert systems with applications Vol. 54; pp. 162 - 169
Main Authors Virgen-Navarro, Luis, Herrera-López, Enrique J., Corona-González, Rosa I., Arriola-Guevara, Enrique, Guatemala-Morales, Guadalupe M.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.07.2016
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ISSN0957-4174
1873-6793
DOI10.1016/j.eswa.2016.01.027

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Abstract •Coffee color during roasting in a spouted bed was assessed by an ANFIS model.•The input variables were color parameters obtained from digital images.•For monitoring in the process line, we constructed an image-capture device.•The model's goodness of fit was assessed by R2, RMSE and SRIC.•The model is proper for monitoring in the process line. An adaptive-network-based fuzzy inference system based on color image analysis was used to estimate coffee bean moisture content during roasting in a spouted bed. The neuro-fuzzy model described the grain moisture changes as a function of brightness (L*), browning index (BI) and the distance to a defined standard (ΔE). An image-capture device was designed to monitor color variations in the L*a*b* space for high temperatures samples taken from the reactor. The proposed model was composed of three Gaussian-type fuzzy sets based on the scatter partition method. The neuro-fuzzy model was trained with the Back-propagation algorithm using experimental measurements at three air temperature levels (400, 450 and 500°C). The performance of the neuro-fuzzy model resulted better compared to conventional methods obtaining a coefficient of determination > 0.98, a root mean square error <0.002 and a modified Schwarz–Rissanen information criterion <0. The simplicity of the model and its robustness against changes in the input variables make it suitable for monitoring on-line the roasting process.
AbstractList An adaptive-network-based fuzzy inference system based on color image analysis was used to estimate coffee bean moisture content during roasting in a spouted bed. The neuro-fuzzy model described the grain moisture changes as a function of brightness (L super(*)), browning index (BI) and the distance to a defined standard ( Delta E). An image-capture device was designed to monitor color variations in the L super(*)a super(*)b super(*) space for high temperatures samples taken from the reactor. The proposed model was composed of three Gaussian-type fuzzy sets based on the scatter partition method. The neuro-fuzzy model was trained with the Back-propagation algorithm using experimental measurements at three air temperature levels (400, 450 and 500 degree C). The performance of the neuro-fuzzy model resulted better compared to conventional methods obtaining a coefficient of determination > 0.98, a root mean square error < 0.002 and a modified Schwarz-Rissanen information criterion < 0. The simplicity of the model and its robustness against changes in the input variables make it suitable for monitoring on-line the roasting process.
•Coffee color during roasting in a spouted bed was assessed by an ANFIS model.•The input variables were color parameters obtained from digital images.•For monitoring in the process line, we constructed an image-capture device.•The model's goodness of fit was assessed by R2, RMSE and SRIC.•The model is proper for monitoring in the process line. An adaptive-network-based fuzzy inference system based on color image analysis was used to estimate coffee bean moisture content during roasting in a spouted bed. The neuro-fuzzy model described the grain moisture changes as a function of brightness (L*), browning index (BI) and the distance to a defined standard (ΔE). An image-capture device was designed to monitor color variations in the L*a*b* space for high temperatures samples taken from the reactor. The proposed model was composed of three Gaussian-type fuzzy sets based on the scatter partition method. The neuro-fuzzy model was trained with the Back-propagation algorithm using experimental measurements at three air temperature levels (400, 450 and 500°C). The performance of the neuro-fuzzy model resulted better compared to conventional methods obtaining a coefficient of determination > 0.98, a root mean square error <0.002 and a modified Schwarz–Rissanen information criterion <0. The simplicity of the model and its robustness against changes in the input variables make it suitable for monitoring on-line the roasting process.
Author Arriola-Guevara, Enrique
Guatemala-Morales, Guadalupe M.
Virgen-Navarro, Luis
Corona-González, Rosa I.
Herrera-López, Enrique J.
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  givenname: Rosa I.
  surname: Corona-González
  fullname: Corona-González, Rosa I.
  email: rcoronagonzalez1@gmail.com
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  givenname: Enrique
  surname: Arriola-Guevara
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  givenname: Guadalupe M.
  orcidid: 0000-0003-1452-7738
  surname: Guatemala-Morales
  fullname: Guatemala-Morales, Guadalupe M.
  email: guadisga@msn.com
  organization: Unidad de Tecnología Alimentaria, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco (CIATEJ), Av. Normalistas No. 800, Guadalajara, Jalisco 44270, Mexico
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Keywords Coffee roasting
Neuro-fuzzy model
Digital image
Spouted bed
Moisture content
Color
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Snippet •Coffee color during roasting in a spouted bed was assessed by an ANFIS model.•The input variables were color parameters obtained from digital images.•For...
An adaptive-network-based fuzzy inference system based on color image analysis was used to estimate coffee bean moisture content during roasting in a spouted...
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elsevier
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StartPage 162
SubjectTerms Artificial neural networks
Beans
Coffee
Coffee roasting
Color
Digital image
Fuzzy logic
Fuzzy set theory
Mathematical models
Moisture content
Monitoring
Neuro-fuzzy model
Roasting
Spouted bed
Title Neuro-fuzzy model based on digital images for the monitoring of coffee bean color during roasting in a spouted bed
URI https://dx.doi.org/10.1016/j.eswa.2016.01.027
https://www.proquest.com/docview/1825467149
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