Pub Date : 2001-11-01DOI: 10.17660/ACTAHORTIC.2001.562.9
J. Hofstee
In the framework of the EC-funded AIR-project Objective plant quality measurement by digital image processing taking images each three weeks during more than nine months follows the development of Ficus benjamina plants. From these images a large number of features is extracted and a relation is laid between these features and the external quality by using neural networks. A segmentation procedure for classifying the pixels into object pixel (plant) and non-object pixels (background) has to be used before feature extraction. Segmentation procedures based on thresholding depend on the specific threshold that is used, especially when the transition between object and background follows a ramp instead of a step andlor the intensity of the object andlor background is not constant for the whole image. Improved versions of MAX-MIN filters for edge enhancement are less noise sensitive than other filters for edge enhancement as for example a Laplace operator. The same feature extraction procedures are applied to images with different illumination levels and that have or have not been enhanced by improved MAX-MIN filtering. The influence of image enhancement by improved MAX-MIN-filtering on the segmentation of images and consequently on the feature values will be discussed.
{"title":"Thresholding of images in combination with 'improved MAX-MIN filters'","authors":"J. Hofstee","doi":"10.17660/ACTAHORTIC.2001.562.9","DOIUrl":"https://doi.org/10.17660/ACTAHORTIC.2001.562.9","url":null,"abstract":"In the framework of the EC-funded AIR-project Objective plant quality measurement by digital image processing taking images each three weeks during more than nine months follows the development of Ficus benjamina plants. From these images a large number of features is extracted and a relation is laid between these features and the external quality by using neural networks. A segmentation procedure for classifying the pixels into object pixel (plant) and non-object pixels (background) has to be used before feature extraction. Segmentation procedures based on thresholding depend on the specific threshold that is used, especially when the transition between object and background follows a ramp instead of a step andlor the intensity of the object andlor background is not constant for the whole image. Improved versions of MAX-MIN filters for edge enhancement are less noise sensitive than other filters for edge enhancement as for example a Laplace operator. The same feature extraction procedures are applied to images with different illumination levels and that have or have not been enhanced by improved MAX-MIN filtering. The influence of image enhancement by improved MAX-MIN-filtering on the segmentation of images and consequently on the feature values will be discussed.","PeriodicalId":197107,"journal":{"name":"World Animal Review","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124741200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A method was investigated for determining the extent to which aerodynamic properties of fertilizer particles can be explained by a combination of turbulent airflow theory and a response surface involving geometric shape and mass of particles for a sample of specific fertilizer material. Fall tests were conducted, where particles were dropped and fall times were described by a mathematical model using turbulent airflow theory. Secondly, a measure of particle shape was determined to explain the difference between theoretical and measured fall times. Various dimensions of particles were measured using digital image processing. Absolute radius deviations from a preassumed best-fit circular shape were recorded and combined from two perpendicular particle images and designated “shape factor”. For a sample of calcium ammonium nitrate (CAN) particles, the shape factor ranged from 11.8 to 73.0 (perfect spheres are zero). Over that range, the difference between theoretical and measured fall times was satisfactorily explained (R2 = 0.82 ) by a function of shape factor and particle mass. A new approach to characterize a bulk of fertilizer material and its spreading properties was proposed.
{"title":"Determining Effects of Fertilizer Particle Shape on Aerodynamic Properties","authors":"J. Walker, T. Grift, J. Hofstee","doi":"10.13031/2013.21239","DOIUrl":"https://doi.org/10.13031/2013.21239","url":null,"abstract":"A method was investigated for determining the extent to which aerodynamic properties of fertilizer particles \u0000can be explained by a combination of turbulent airflow theory and a response surface involving geometric shape and \u0000mass of particles for a sample of specific fertilizer material. Fall tests were conducted, where particles were dropped and \u0000fall times were described by a mathematical model using turbulent airflow theory. Secondly, a measure of particle shape \u0000was determined to explain the difference between theoretical and measured fall times. Various dimensions of particles \u0000were measured using digital image processing. Absolute radius deviations from a preassumed best-fit circular shape were \u0000recorded and combined from two perpendicular particle images and designated “shape factor”. For a sample of calcium \u0000ammonium nitrate (CAN) particles, the shape factor ranged from 11.8 to 73.0 (perfect spheres are zero). Over that range, \u0000the difference between theoretical and measured fall times was satisfactorily explained (R2 = 0.82 ) by a function of shape \u0000factor and particle mass. A new approach to characterize a bulk of fertilizer material and its spreading properties was \u0000proposed.","PeriodicalId":197107,"journal":{"name":"World Animal Review","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133460618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1007/978-94-015-8782-2_5
M. Korthals
{"title":"Reconstruction and explanation of foundational development","authors":"M. Korthals","doi":"10.1007/978-94-015-8782-2_5","DOIUrl":"https://doi.org/10.1007/978-94-015-8782-2_5","url":null,"abstract":"","PeriodicalId":197107,"journal":{"name":"World Animal Review","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129937440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1007/978-94-015-8782-2_7
M. Korthals
{"title":"Dimensions of individual and collective development in various domains","authors":"M. Korthals","doi":"10.1007/978-94-015-8782-2_7","DOIUrl":"https://doi.org/10.1007/978-94-015-8782-2_7","url":null,"abstract":"","PeriodicalId":197107,"journal":{"name":"World Animal Review","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129219720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1007/978-1-4615-6273-3_8
J. Steenkamp
{"title":"Dynamics in consumer behavior with respect to agricultural and food products","authors":"J. Steenkamp","doi":"10.1007/978-1-4615-6273-3_8","DOIUrl":"https://doi.org/10.1007/978-1-4615-6273-3_8","url":null,"abstract":"","PeriodicalId":197107,"journal":{"name":"World Animal Review","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127431316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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