Canny Edge Detection | 555Tools — Online Tools for FPGA & Algorithm Engineers

Image AlgorithmsTool Introduction

Canny edge detection is a multi-stage optimal edge detection algorithm: Gaussian smoothing for noise reduction, Sobel operator for gradient magnitude and direction, non-maximum suppression (NMS) to thin to single-pixel-width edges, and double threshold hysteresis for connected edges.

Key Formula / Principle

1. I_smooth = Gaussian(I, σ)
2. gx, gy = Sobel(I_smooth) → mag, dir
3. NMS: suppress non-maxima along dir
4. Double threshold hysteresis: mag > high → strong edge; mag > low and connected to strong → weak edge

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