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	分水嶺セグメンテーション	ブロブ検出
分野	コンピュータビジョン	コンピュータビジョン
系統	Machine learning	Machine learning
提唱年	1979	1998
提唱者	Serge Beucher and Christian Lantuéjoul	Tony Lindeberg
種類	Morphological image segmentation	Multi-scale feature detection
原典	Meyer, F. (1994). Topographic distance and watershed lines. Signal Processing, 38(1), 113–125.	Lindeberg, T. (1998). Feature detection with automatic scale selection. International Journal of Computer Vision, 30(2), 79–116.
別名	Watershed transform, Water shedding segmentation	Connected component analysis, Region-based detection
関連	5	5
概要	Watershed segmentation is a morphological image processing technique that automatically segments an image into distinct regions by treating image intensity as a topographic landscape where each object corresponds to a valley. Introduced by Beucher and Lantuéjoul in 1979 and refined by Meyer, the watershed algorithm is particularly effective for separating touching or overlapping objects.	Blob detection is a technique for identifying regions of interest (blobs)—connected, homogeneous areas that differ from their surroundings—at multiple scales. Introduced by Lindeberg in the context of scale-space theory, blob detection automatically finds and characterizes circular or elliptical objects without requiring a priori knowledge of their size.