Image Filter dan Edge Detection. PERMUKAAN IMAGE IMAGE PLANE X Y Graylevel I(x,y)

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Presentation transcript:

Image Filter dan Edge Detection

PERMUKAAN IMAGE IMAGE PLANE X Y Graylevel I(x,y)

STEP EDGE Gray_1 Gray_2 Sideview

DETEKSI EDGE ORDE PERTAMA Prewitt Templates Sobel Templates

Isotropic Good Localization Good Signal-To-Noise Characteristics Accurate Determination of Edge Orientation EDGE DETEKTOR YG BAIK BILA:

ISOTROPIC EDGE DETECTION

SIGNAL-TO-NOISE RATIO AND LOCALIZATION Noise Added to Image Edge Image Smoothed Image Edge Image

Contoh pattern berbagai frekuensi

TURUNAN DARI STEP-EDGE

EDGE OPERATOR ORDE 2 MARR-HILDRETH OPERATOR Dikombinasikan dengan Gaussian smoothing

FUNGSI GAUSSIAN 1-D DAN 2-D

MEXICAN HAT FILTER

EDGE OPERATOR ORDE 2 CANNY OPERATOR: Take second derivative in direction of gradient (Ix,Iy). Look for ‘Zero-Crossing’ of second derivative in this direction. Can also threshold with respect to first order edge strength. Direction of first order gradient (Ix,Iy) gives edge orientation. Proved to have optimal localization properties.

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