noun
level set
In computing and mathematics, a set of points where a function takes a constant value; also used in image processing and optimization.
レベルセット法は画像の輪郭抽出に使われる。
The level set method is used for contour extraction in images.
関数 f(x,y)=c を満たす点の集合をレベルセットと呼ぶ。
The set of points satisfying f(x,y)=c is called a level set.