Gradient calculation (Sobel Operators) - to detect edges; Gradient Magnitude Thresholding - to get rid of spurious response to edge detection; Double threshold - to determine potential edges; Edge ...

Unlike blob analysis, the feature-based algorithms used in edge detection remain robust in less-than-ideal light conditions and can locate predefined shapes regardless of angle.

Kristopher Bedka, Jason Brunner, Richard Dworak, Wayne Feltz, Jason Otkin, Thomas Greenwald, Objective Satellite-Based Detection of Overshooting Tops Using Infrared Window Channel Brightness ...