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Atlas de IA

Classificação de imagens

Decidir a que categoria pertence a imagem inteira

Compreensão visualIniciante #11
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O texto completo é apresentado em inglês; o título e o resumo estão traduzidos.

O QUE ESTA CAPACIDADE SIGNIFICA

Takes an image and outputs a category label or a probability over classes. It judges the whole image and gives no location, which is what separates it from detection and segmentation. The class set is fixed at training time, ranging from the thousand-odd general classes to narrow sets for a species or a defect type.

Como é feita tecnicamente

Convolutional networks long dominated, and residual connections were the turning point that let them grow deep reliably. The image is resized to a fixed size, features are extracted layer by layer, and a classification head emits probabilities. Vision Transformers have since replaced convolution with patch embeddings and attention, matching it under large-scale pre-training, while self-supervised pre-training makes good results possible with little labelling.

Produtos representativos

4

Organizações relacionadas

Usos típicos

  • Automatic tagging of products and photos
  • Lesion screening in medical imaging
  • Defect judgement in industrial inspection
  • Content moderation and safety filtering

Como avaliar se funciona bem

Top-1 / Top-5 accuracy
Share where the top or top-five guesses contain the correct class
F1 and confusion matrix
Reveals which two classes are being confused
Expected calibration error
Whether predicted confidence matches actual accuracy

Limites e dificuldades

  • Long-tailed and rare classes are chronically missed for lack of examples
  • Out-of-distribution inputs and tiny adversarial perturbations swing the prediction
  • Fine-grained distinctions such as similar car models rely on texture cues and score far lower than coarse classes

Conceitos por trás