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     Vol. 30, issue 1 January - April 2024   Creative Commons License

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     Vol. 30, issue 1 January - April 2024  

 
  

CIE L*a*b* polygon for quantifying scab (Sphaceloma perseae) in avocado fruit images

Polígono CIE L*a*b* para cuantificar roña (Sphaceloma perseae) en imágenes de frutos de aguacate

Erik Acuayte-Valdes; Alejandro Facundo Barrientos-Priego; Elisa Duran-Peralta; Mercedes Cabrera-Morales; Graciano Javier Aguado-Rodríguez

Keywords: Persea americana, colorimetric parameters, digital image processing

10.5154/r.rchsh.2023.06.004

Received: 2023-05-30
Accepted: 2023-10-23
Available online: 2023-12-01
Pages:3-15

Avocado scab causes great economic losses in Mexico and the world. This study aimed to provide an automatic method of quantifying this symptom. The proposed method uses polygonal regions from the a-b plane of the CIE L*a*b* color format to identify a color (even with variations) and different avocado fruit shades. The polygons were used to determine the scab percentage in 70 Hass avocado fruit images. The scab percentage was estimated with a diagrammatic scale, and the regression equation y = 0.5848x, with an r 2 = 0.80, was found when comparing these results with scab percentages obtained from digitized images (observed). With the method presented in this study, the equation y = 0.9923x was found, with an r2 = 0.8672, so the proposed automatic method performed better.

....

Avocado scab causes great economic losses in Mexico and the world. This study aimed to provide an automatic method of quantifying this symptom. The proposed method uses polygonal regions from the a-b plane of the CIE L*a*b* color format to identify a color (even with variations) and different avocado fruit shades. The polygons were used to determine the scab percentage in 70 Hass avocado fruit images. The scab percentage was estimated with a diagrammatic scale, and the regression equation y = 0.5848x, with an r 2 = 0.80, was found when comparing these results with scab percentages obtained from digitized images (observed). With the method presented in this study, the equation y = 0.9923x was found, with an r2 = 0.8672, so the proposed automatic method performed better.

....
 

GENETIC PARAMETERS OF THE HUSK TOMATO (Physalis ixocarpa Brot.) CHF1 CULTIVAR

Aureliano Peña-Lomelí;José D. Molina-Galán;Jaime Sahagún-Castellanos;J. Ortíz-Cereceres;F. Márquez-Sánchez;T. Cervantez-Santana;J.F. Santiaguillo-Hernández

10.5154/r.rchsh.2006.11.046

Received: 2006-11-08
Accepted: 2007-08-14
Available online: 2016-07-01

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ON-FARM GENETIC DIVERSITY AND CROPPING SYSTEM OF Phaseolus vulgaris AND Vigna unguiculata AT THE CHONTALPA REGION IN TABASCO, MÉXICO

Luz del C. Lagunes-Espinoza;F. Gallardo-López;H. Becerril-Hernández;E.D. Bolaños-Aguilar

10.5154/r.rchsh.2006.11.047

Received: 2006-11-08
Accepted: 2007-08-14
Available online: 2016-07-01

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PLANT PHENOLOGY, YIELD AND FRUIT CHARACTERISTICS OF PEACH (Prunus persica L. Batsch.) ANA CULTIVAR SELECTIONS AT AGUASCALIENTES

F. Gutierrez-Acosta;José Saúl Padilla Ramírez;Luís Reyes Muro

10.5154/r.rchsh.2007.05.026

Received: 2007-05-14
Accepted: 2007-08-06
Available online: 2016-07-01

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AGRICULTURAL UTILIZATION OF THE BIOSOLIDS AND INLFLUENCE IN THE TOMATO CROP (Lycopersicon esculentum MILL)

E. Utria-Borges;J.A. Cabrera-Rodriguez;I.M. Reynaldo-Escobar;D. Morales-Guevara;A.M. Fernández;E. Toledo-Toledo

10.5154/r.rchsh.2006.02.009

Received: 2006-02-04
Accepted: 2007-05-16
Available online: 2016-01-01

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CHARACTERIZATION OF SAPOTE MAMEY FRUITS (Pouteria sapota), IN THE SOUTHWEST REGION OF MORELOS

A. Gaona-García;Irán Alia-Tejacal;Víctor López-Martínez;María Andrade-Rodríguez;Ma. Teresa Colinas-León;Oscar Gabriel Villegas-Torres

10.5154/r.rchsh.2006.02.013

Received: 2006-02-14
Accepted: 2007-06-26
Available online: 2016-07-01

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WATER DEFICIT AND CROP LOAD EFFECTS ON YIELD AND FRUIT QUALITY OF APPLE

Rafael Parra-Quezada;T.L. Robinson;J. Osborne;L.B. Parra-Bujanda

10.5154/r.rchsh.2006.02.014

Received: 2006-02-14
Accepted: 2007-06-26
Available online: 2016-07-01

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NITRIC NUTRITION, AND IRRIGATION SYSTEMS EFFECTS ON STRAWBERRY (Fragaria x ananassa Duch.) FLAVOR

L.A. Ojeda-Real;R. Cárdenas-Navaro;Phillipe Lobbit;O. Grageda-Cabrera;E. Valencia-Cantero;L. Macías-Rodriguez

10.5154/r.rchsh.2006.02.015

Received: 2006-02-14
Accepted: 2007/08/30
Available online: 2016-07-01

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EFFECT OF ACETYL SALICYLIC ACID AND Bacillus subtilis ON Cucumber mosaic virus GOURD INFECTION

E. Maldonado-Cruz;Daniel Leobardo Ochoa-Martínez;Bertha Tlapal-Bolaños

10.5154/r.rchsh.2007.02.010

Received: 2007-02-12
Accepted: 2007-08-28
Available online: 2016-07-01

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RIPENING SEASON AND FRUIT QUALITY OF APPLE GENOTYPES AT CADEREYTA, QUERETARO

D. Mendoza-González;Ramón Álvar Martínez-Peniche;M.R. Fernández-Montes;Agustín Rumayor-Flores;E. Castillo-Castañeda

10.5154/r.rchsh.2007.02.011

Received: 2007-02-19
Accepted: 2007-09-11
Available online: 2016-07-01

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SYSTEMIC FUNGICIDES EVALUATION FOR DOWNY MILDEW CONTROL (Pseudoperonospora cubensis Berk. & Curt.) Rost. ON CANTALOUPE MELON (Cucumis melo L.)

E. Ruíz-Sánchez;J.M. Tún-Suárez;L.L. Pinzón-López;G. Valerio-Hernández;M.J. Zavala-León

10.5154/r.rchsh.2005.09.034

Received: 2005-09-07
Accepted: 2007-09-28
Available online: 2016-07-01

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HARVEST DELAY IN CACTUS PEAR cv. CRISTALINA

Jorge Alberto Zegbe-Dominguez;Jaime Mena-Covarrubias

10.5154/r.rchsh.2006.02.016

Received: 2006-02-14
Accepted: 2007-09-28
Available online: 2016-07-01

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‘AUTUMN BLISS’ RED RASPBERRY PHENOLOGY AT GUERRERO, CHIHUAHUA STATE, MEXICO

Rafael Parra-Quezada;M.R. Ramírez-Legarreta;Juan Luis Jacobo-Cuellar;Jesús Guadalupe Arreola-Ávila

10.5154/r.rchsh.2007.04.024

Received: 2007-04-23
Accepted: 2007-10-03
Available online: 2016-07-01

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