Chapter 5 feature extraction

Các phép biến đổi để tìm biên bằng các kỹ thuật khác nhau,xác định tâm của đối tượng trong ảnh

1 1/29 HanoiUniversityofScienceandTechnology SchoolofElectronicsandTelecommunications Chapter5.Featur eExtraction DigitalImagePro cessing 2/29 HanoiUniversityofScienceandTechnology SchoolofElectronicsandTelecommunications 3/29 HanoiUniversityofScienceandTechnology SchoolofElectronicsandTelecommunications d kEyxI <),( v(r)n(r) × <kEyxI ),( d < × < v(r)n(r)0 4/29 HanoiUniversityofScienceandTechnology SchoolofElectronicsandTelecommunications 5/29 HanoiUniversityofScienceandTechnology SchoolofElectronicsandTelecommunications 6/29 HanoiUniversityofScienceandTechnology SchoolofElectronicsandTelecommunications 7/29 HanoiUniversityofScienceandTechnology SchoolofElectronicsandTelecommunications 8/29 HanoiUniversityofScienceandTechnology SchoolofElectronicsandTelecommunications 9/29 HanoiUniversityofScienceandTechnology SchoolofElectronicsandTelecommunications 10/29 HanoiUniversityofScienceandTechnology SchoolofElectronicsandTelecommunications [...]... HanoiUniversityofScienceandTechnology 25/ 29 SchoolofElectronicsandTelecommunications HanoiUniversityofScienceandTechnology 26/29 SchoolofElectronicsandTelecommunications HanoiUniversityofScienceandTechnology 27/29 SchoolofElectronicsandTelecommunications HanoiUniversityofScienceandTechnology 28/29 SchoolofElectronicsandTelecommunications HanoiUniversityofScienceandTechnology 29/29 SchoolofElectronicsandTelecommunications 5. 8 Mt s... (Block variation of local correlation coefficients) k r ( )= l 1 ồ I(i, j)I(i+ D i(k),j+ D j(k))- m lm l+ D(k) W2 (i,j)ẻBlk s ls l+ D (k) D (k)=( i (k),D j(k))l D v trớ dch theo 4 hng 0 0 ( 90 ,00,- 45 , 45 ) - 0 Giỏ tr BVLC: } g k ( )= max [r k ( )]- min [r k ( )], O = {( ,k),( ,0 ( ,k),( ,- k) l l l 0 k ), k k 4 D (k) O ẻ 4 D (k) O ẻ 4 HanoiUniversityofScienceandTechnology 34/29 SchoolofElectronicsandTelecommunications... nghiờng trc chớnh (Direction angle of the 1st primary axis) ổ 2 11 ử np m 1 ữ q = tan-1 ỗ ỗ m - m ữ + 2 2 02 ứ ố 20 HanoiUniversityofScienceandTechnology 33/29 SchoolofElectronicsandTelecommunications 5. 9 c trng BDIP v BVLC trong vựng nh WxW - BDIP (Block Difference of Inverse Probability) bk ( )= l 1 ồ ộ max I(i, j)- I(i, j)ự ỳ W2 (i, j)ẻBlk ờ (i, j)ẻBlk ở ỷ max I( , j) i (i, j) Bk ẻ l BDIP = 1.33... HanoiUniversityofScienceandTechnology 13/29 SchoolofElectronicsandTelecommunications HanoiUniversityofScienceandTechnology 14/29 SchoolofElectronicsandTelecommunications HanoiUniversityofScienceandTechnology 15/ 29 SchoolofElectronicsandTelecommunications h(x y = ẹ 2[G x y * I(x y ] = ẹ 2[G x y ] I(x y , ) ( , ) , ) ( , ) * , ) HanoiUniversityofScienceandTechnology 16/29 SchoolofElectronicsandTelecommunications