The third step of the Region-based Convolutional Neural Network (R-CNN) model involves classifying the objects within the proposed regions. Taking the features extracted by the CNN and the labeled class of each region proposal as training examples, multiple Support Vector Machines (SVMs) are trained. Each individual SVM functions as a binary classifier to determine whether a region contains a specific object class.

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In the second step of the Region-based Convolutional Neural Network (R-CNN) model, a pretrained Convolutional Neural Network (CNN) is chosen and truncated prior to its output layer. Each region proposal extracted from the image is then resized to match the required input dimensions of this network. Finally, the CNN performs forward propagation on these resized regions to extract and output their features.

R-CNN Feature Extraction

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R-CNN Object Classification

In the fourth and final step of the Region-based Convolutional Neural Network (R-CNN) model, a linear regression model is trained to precisely predict the ground-truth bounding box of the object. This regression model utilizes the features extracted by the CNN alongside the labeled bounding box of each region proposal as its training examples.

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