Physical behavior of materials is the function of phases present. In the image shown below, there are two phases present: Transformed Ledeburite (black phase) and Pearlite (white). Using a threshold method, the volume fraction of pearlite phase can be approximated. Here, seven different thresholds have been used with their corresponding fraction of pearlite phase. Please use the slider bar to find the correct estimate for the fraction of pearlite?

Optical Micrograph

Predicted Threshold Micrograph

Threshold pixel: 152

Vol. fraction of pearlite phase: 10.11%

Threshold pixel: 149

Vol. fraction of pearlite phase: 16.60%

Threshold pixel: 144

Vol. fraction of pearlite phase: 24.91%

Threshold pixel: 120

Vol. fraction of pearlite phase: 39.36%

Threshold pixel: 96

FracVol. fraction of pearlite phasetion: 48.96%

Threshold pixel: 62

Vol. fraction of pearlite phase: 64.51%

Threshold pixel: 41

Vol. fraction of pearlite phase: 78.88%