下面仅讨论常用的几种边缘检测器（边缘算法），一阶边缘算子有罗伯特交叉（Roberts cross） 算子，蒲瑞维特（Prewitt）和索贝尔（Sobel）算子。二阶边缘算子有拉普拉斯（Laplacian） 算子和二阶方向导数。
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以上来源于: WordNet
McVeigh opened the scoring when he side-footed the ball home at the far post following Iwan Roberts' excellent low cross from the right.
BBC: Reading 0-2 Norwich
When being cross-examined by counsel for Sally Roberts, the doctor was asked about alternative treatment and therapies.
BBC: Neon Roberts 'should have radiotherapy' for tumour
The impressive Jermaine Jones broke through the middle and fed Emerton, whose low cross was converted from close range by Roberts.
BBC: West Ham 1-1 Blackburn
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