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Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Classification of Varying-Size Plankton Images with Convolutional Neural Network
 Bureš, Jaroslav ; Juránek, Roman (oponent) ; Zemčík, Pavel (vedoucí práce)
This work considers techniques of automatic image analysis based on convolutional neural networks (CNN) focused on plankton classification. There is a large variation in the shapes and sizes of plankton images. This makes the classification for CNN based methods challenging since CNNs typically require a fixed input size. Naive methods utilize scaling of the images to a common size. However, this operation leads to the loss of small details that are necessary for correct classification. The aim of this work was to design and implement a CNN-based classifier of plankton images and explore possible methods that can deal with a variety of image sizes. Multiple methods such as patch cropping, utilization of a spatial pyramid pooling layer, inclusion of metadata and construction of multi-stream model were evaluated on a challenging dataset of phytoplankton images. With these methods an improvement of 1.0 point was achieved for the InceptionV3 architecture resulting in an accuracy of 96.2 %. The main contribution of this thesis is an improvement of multiple CNN plankton classifiers by successfully applying these methods.
Úplný záznam
Classification of Varying-Size Plankton Images with Convolutional Neural Network
 Bureš, Jaroslav ; Juránek, Roman (oponent) ; Zemčík, Pavel (vedoucí práce)
This work considers techniques of automatic image analysis based on convolutional neural networks (CNN) focused on plankton classification. There is a large variation in the shapes and sizes of plankton images. This makes the classification for CNN based methods challenging since CNNs typically require a fixed input size. Naive methods utilize scaling of the images to a common size. However, this operation leads to the loss of small details that are necessary for correct classification. The aim of this work was to design and implement a CNN-based classifier of plankton images and explore possible methods that can deal with a variety of image sizes. Multiple methods such as patch cropping, utilization of a spatial pyramid pooling layer, inclusion of metadata and construction of multi-stream model were evaluated on a challenging dataset of phytoplankton images. With these methods an improvement of 1.0 point was achieved for the InceptionV3 architecture resulting in an accuracy of 96.2 %. The main contribution of this thesis is an improvement of multiple CNN plankton classifiers by successfully applying these methods.
Úplný záznam

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