1. In the name of God
Based on Image Processing for Detecting Tile Defects Adaptive Threshold ‌
Heydar Toossian Shandiz
Shahrood University of Technology
7Tir Square, P.O.Box
Shahrood
Iran

2. imperfect edges at the tile borders
Defects
small spots
Three Majors defects
thin strips
imperfect edges at the tile borders

3. Key Information
Defects have normally very light or very dark intensity in compare with normal texture on tile surface

4. Binary Image cracks, scratches, pin-holes, spots and chips dark nature
Gray level
defects such as water drops, color grade and blobs
Light nature

5. Putting M by N image pixels of tilt to array Y
First Step of 5
Putting M by N image pixels of tilt to array Y
Data set = {X , Y}
X is index of vector Y

6. Second step of 5
Changing Y image to binary image by Thershold T, Which is initially set to zerro

7. Regression line is calculated
Third step of 5
Regression line is calculated

8. Fourth step of 5
E=Abs ( Y-f )

9. Last step of 5
eMax( T ) = Max { E }

10. eMax Versus T

11. ∆T > Γ Then The tile is defected
Clasifier
∆T=T1 – T0
∆T > Γ Then The tile is defected

12. Calculating the Γ
Γ= μ p + α σ p

13. Sample Tiles

14. Key parameters for samples

15. Thanks all