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当您需要稳定点进行图像匹配、运动跟踪、全景构建、对齐或视觉搜索时，特征检测非常有用。该工作流程不是对每个像素进行推理，而是突出显示独特的角点和点，这些角点和点在光照变化或视点移动时更有可能保持有用。
使用特征检测工具查找图像中的角点和关键点，以进行匹配、跟踪、配准、拼接和计算机视觉原型设计。
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Feature detection identifies distinctive points in images — corners, edges, and blobs. These keypoints are used for image matching, stitching, object recognition, and tracking.
Harris detects corners using eigenvalue analysis — reliable but slow. FAST is optimized for speed using pixel intensity comparisons. ORB combines FAST detection with BRIEF descriptors and is scale/rotation invariant.