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PERTEMUAN KE 6 – EDGE DETECTION

PENGOLAHAN CITRA

PROGRAM STUDI INFORMATIKA

UNIVERSITAS GUNADARMA

PROGRAM STUDI INFORMATIKA

UNIVERSITAS GUNADARMA

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DEFINISI EDGE DETECTION

METODE EDGE DETECTION

PROGRAM STUDI INFORMATIKA

UNIVERSITAS GUNADARMA

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DEFINISI EDGE DETECTION

PROGRAM STUDI INFORMATIKA

UNIVERSITAS GUNADARMA

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20NN

DEFINISI

Edge /tepi

adalah batas antara dua daerah dengan nilai gray-level yang relatif berbeda

Dengan kata lain edge merupakan tempat yang memiliki perubahan intensitas yang

besar dalam jarak yang pendek

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20NN

Edge detection (deteksi tepi) adalah proses menemukan batas/tepi atau peralihan intensitas yang signifikan dalam sebuah citra, yang biasanya menunjukkan batas objek atau perubahan struktur penting.

Tujuan utamanya adalah mengekstrak fitur tepi sehingga citra lebih mudah dianalisis untuk keperluan seperti segmentasi, pengenalan objek, dan analisis bentuk.

DEFINISI

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20NN

Aplikasi Edge Detection

Segmentasi objek (misalnya dalam medis: mendeteksi organ atau tumor)
Pengukuran dan analisis bentuk
Navigasi robot (deteksi rintangan)
Pengolahan teks/citra dokumen (deteksi kontur huruf)
Kompresi citra berbasis fitur

DEFINISI

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20NN

Konsep Dasar :

Tepi muncul pada citra ketika ada:
Perubahan intensitas terang ke gelap (atau sebaliknya) yang tajam,
Perubahan warna atau tekstur,
Pergeseran geometri pada objek.
Dalam bentuk matematis, tepi dapat dianggap sebagai lokasi dengan turunan pertama atau kedua intensitas yang tinggi.

DEFINISI

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20NN

Pada deret citra seperti pada gambar di samping,

Kemungkinan besar tepi Adalah antara 12 dan 50,

Karena disitulah letak perbedaan yang kontras (gradiennya tinggi)

DEFINISI

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UNIVERSITAS GUNADARMA

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20NN

Jenis Tepi

Tepi Curam (Step Edge)
Tepi Landai (Ramp Edge)
Tepi Garis (Line Edge)
Tepi Atap (Roof Edge)

DEFINISI – JENIS TEPI

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20NN

DEFINISI – JENIS TEPI

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20NN

DEFINISI – JENIS TEPI

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METOD EDGE DETECTION

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20NN

METODE EDGE DETECTION

Pendeteksian tepi dapat dipahami dengan pendekatan kaklulus diferensial

Sebab,

perubahan intensitas yang besar dalam jarak yang singkat

dipandang sebagai fungsi yang memiliki kemiringan yang besar.

Kemiringan fungsi dapat dihitung dengan

turunan pertama (gradient), turunan kedua (laplace),dll

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20NN

TURUNAN PERTAMA

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20NN

Turunan Pertama,

Dapat ditulis dalam fungsi :

METODE EDGE DETECTION

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20NN

METODE EDGE DETECTION

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UNIVERSITAS GUNADARMA

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20NN

METODE EDGE DETECTION

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UNIVERSITAS GUNADARMA

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20NN

METODE EDGE DETECTION

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20NN

METODE EDGE DETECTION - ROBERT

Oleh Robert, �masking ini kemudian dimodifikasi menjadi sebagai berikut :

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20NN

METODE EDGE DETECTION

PROGRAM STUDI INFORMATIKA

UNIVERSITAS GUNADARMA

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20NN

METODE EDGE DETECTION

PROGRAM STUDI INFORMATIKA

UNIVERSITAS GUNADARMA

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20NN

METODE EDGE DETECTION - SOBEL

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UNIVERSITAS GUNADARMA

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20NN

METODE EDGE DETECTION - SOBEL

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UNIVERSITAS GUNADARMA

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20NN

METODE EDGE DETECTION - SOBEL

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UNIVERSITAS GUNADARMA

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20NN

METODE EDGE DETECTION - SOBEL

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20NN

METODE EDGE DETECTION - PREWITT

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20NN

METODE EDGE DETECTION - PREWITT

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UNIVERSITAS GUNADARMA

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20NN

METODE EDGE DETECTION

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20NN

TURUNAN KEDUA

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20NN

METODE EDGE DETECTION

PROGRAM STUDI INFORMATIKA

UNIVERSITAS GUNADARMA

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20NN

METODE EDGE DETECTION

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20NN

METODE EDGE DETECTION

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20NN

METODE EDGE DETECTION

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UNIVERSITAS GUNADARMA

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20NN

METODE EDGE DETECTION

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UNIVERSITAS GUNADARMA

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20NN

METODE EDGE DETECTION

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20NN

METODE EDGE DETECTION

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20NN

METODE EDGE DETECTION

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20NN

METODE EDGE DETECTION

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20NN

METODE EDGE DETECTION

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Tim Penyusun:

TERIMA

KASIH

PROGRAM STUDI INFORMATIKA

UNIVERSITAS GUNADARMA

PROGRAM STUDI INFORMATIKA

UNIVERSITAS GUNADARMA