"Ground truth"是什么意思？

最新推荐文章于 2025-06-01 00:00:00 发布

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最新推荐文章于 2025-06-01 00:00:00 发布

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Ground truth是指在测试系统中比测量值更精确的一组真实数据。例如，在测试立体视觉系统时，激光测距仪提供的3D位置作为参照。在边缘检测中，由于涉及主观选择，Ground truth的概念不那么明确，可能包括高质量边缘检测器的输出或专家手动绘制的边缘。确定Ground truth的目标应基于你的最终需求。

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"Ground truth" means a set of measurements that is known to be much more accurate than measurements from the system you are testing.

For example, suppose you are testing a stereo vision system to see how well it can estimate 3D positions. The "ground truth" might be the positions given by a laser rangefinder which is known to be much more accurate than the camera system.

Sometimes synthetic data are generated from a model, to test a system whose goal is to estimate parameters of the model. In such cases the "ground truth" is the known parameters of the model. Again stereo vision provides a good example: computer graphics can generate synthetic images from a 3D model, and then a stereo vision system can try to reconstruct the model. The original model is the "ground truth".

In the case of edge detection, it's much less clear what "ground truth" means, and in fact I don't think it's well defined, as edge detection generally involves making some (more or less) a