Flow diagram depicting the training and testing phases of the computer algorithm.

A human expert establishes the “ground truth.” The computer then creates a prediction rule by modeling image characteristics and analyzing pixel neighborhoods. In the testing phase, the computer applies the prediction rule to a new set of images. The computer results are finally validated by the human expert. White and gray boxes refer to the human expert and computer actions, respectively.人类专家确立真值（ground truth）。随后，计算机通过对图像特征进行建模并分析像素邻域，生成预测规则。在测试阶段，计算机将该预测规则应用于全新的图像集合。最终由人类专家对计算机生成的结果进行校验。白色方框与灰色方框分别对应人类专家与计算机的操作流程。