Image-Based Framework for Concrete Surface Crack Monitoring and Quantification

Figure 5

Definition of crack width: the distance from (𝑥₁,𝑦₁) to (𝑥₂,𝑦₂) is the shortest compared with others, for example, from (𝑥₁,𝑦₁) to (𝑥^′₂,𝑦^′₂); the former defines the crack width 𝑤 at (𝑥₁,𝑦₁).