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AI2024年9月5日7 min read

ニューラルネットワークによる画像分類:初心者向けガイド

この記事は英語で利用可能です。インターフェースは日本語に翻訳されています。

Image classification is the task of assigning a label to an entire image. It's one of the foundational tasks in deep learning.

How Image Classification Works

1. Input: An image is represented as a grid of pixel values

2. Feature extraction: Convolutional layers detect patterns (edges, textures, shapes)

3. Classification: Fully connected layers map features to class probabilities

4. Output: The class with highest probability is the prediction

Vision Transformers (ViT)

Modern classifiers use Vision Transformers instead of CNNs:

  • Split the image into patches (16×16 pixels)
  • Treat each patch as a "token" (like words in NLP)
  • Use self-attention to understand relationships between patches
  • Classify based on global understanding of the image
  • Accuracy and Limitations

  • Top-5 accuracy on ImageNet exceeds 99%
  • Struggles with unusual angles, contexts, or rare objects
  • Confidence scores indicate reliability
  • Multiple valid labels may exist for one image
  • Classify any image with our Image Classifier using the ViT model running entirely in your browser.

    Once you know what is in the image, use our Image Captioner to generate a natural-language description of the scene.

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