Image classification apparatus, image classification method, and computer-readable, non-transitory recording medium storing image classification program

An image classification method adapted to classify an input image, comprising:

• calculating, by using an image classification model, a prediction vector predicting a class into which the input image is classified;
• calculating a probability vector and a confidence level of classification, based on the prediction vector for the input image;
• converting the input image to generate a converted image when the confidence level is less than a first threshold value;
• calculating an integrated prediction vector derived from adding up the prediction vector for the input image and a prediction vector for the converted image calculated based on the image classification model, and calculating an integrated probability vector from the integrated prediction vector;
• and
• determining a class of the input image based on the probability vector or the integrated probability vector.

A computer-readable non-transitory recording medium storing an image classification program adapted to classify an input image, comprising computer-implemented modules including:

• a module that calculates, by using an image classification model, a prediction vector predicting a class into which the input image is classified;
• a module that calculates a probability vector and a confidence level of classification, based on the prediction vector for the input image;
• a module that converts the input image to generate a converted image when the confidence level is less than a first threshold value;
• a module that calculates an integrated prediction vector derived from adding up the prediction vector for the input image and a prediction vector for the converted image calculated based on the image classification model and calculates an integrated probability vector from the integrated prediction vector;
• and
• a module that determines a class of the input image based on the probability vector or the integrated probability vector.