Pengenalan DOCUMENT IMAGE UNDERSTANDING · PDF fileDokumen = Struktur + Isi • Struktur...
Transcript of Pengenalan DOCUMENT IMAGE UNDERSTANDING · PDF fileDokumen = Struktur + Isi • Struktur...
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DOCUMENT IMAGEUNDERSTANDING
Peb Ruswono Aryan
Pengenalan
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Ikhtisar
• Dokumen• Contoh Aplikasi• Akuisisi Citra• Rumusan Image Understanding• Tahapan• Penutup
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Dokumen
• Medium PemuatInformasi– Tulisan– Gambar
• Wujud– Fisik– Abstrak
• 2 Dimensi– Dinding– Tablet– Perkamen– Buku– Kertas
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Dokumen = Struktur + Isi• Struktur
– Peran secara logis• mis. Judul
– Informasi Geometri• Posisi• Skala• Orientasi
– Styling• Font• Arsiran
• Isi– Teks
• PengenalanHuruf
– Tabel– Diagram– Gambar
• Grafik• Natural Image
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Proses Pembuatan Dokumen
• Tangan– Tulisan– Ilustrasi / Tanda
• Mesin– Mekanik– Digital
• Tata Letak• Komposisi• Efek tambahan
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Akuisisi Citra
• Perangkat Akuisisi– Kamera
• Resolusi terbatas• Perspektif• Multispektrum
– Cahaya Tampak– Infra Merah– UV, X-Ray
– Pemindai (Scanner)• Flatbed• Automatic Document Feeder• Resolusi besar
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Otomasi Formulir• Scanner ADF• Formulir berdesain
khusus• Pemeriksaan Ujian• Entri Data
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Tes Pauli
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Pemilu 2009• Ekstraksi Informasi
Tulisan Tangan (angka)• Sensitivitas Kesalahan
Manusia– Isu Politis
• Mitigasi Risiko Kesalahan– Identifikasi Kesalahan– Pemanduan Proses
Verifikasi
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Target Scoring• Kamera, gelap (low-
light)• Real-time, video
processing• getaran, hentakan,
pencahayaan
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Citra Geologi .
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Document Image Understanding
• Kebalikan dari Document Authoring
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Rumusan Image Understanding• Identifikasi / Klasifikasi• Pengolahan
– Normalisasi• Distorsi, Orientasi, Pencahayaan
– Perbaikan• Analisis
– Ekstraksi Informasi• Tata Letak (Layout Analysis)
• Pemahaman– Pemetaan ke Struktur Logis (Judul, Nomor Halaman,
footnote)
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Normalisasi
• Terbalik (up-down)• Skew / Miring• Properti Global diestimasi dari elemen
penyusun (lokal)
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Normalisasi
• Terbalik (up-down)• Skew / Miring• Properti Global diestimasi dari elemen
penyusun (lokal)
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Analisis Layout
• Dekomposisi Citra jadi subarea (ROI)• Pendekatan
– Top-Down : mulai dari keseluruhan citra; partisi– Bottom-Up : mulai dari piksel lalu gabung– Hibrid
• Pengetahuan a priori– berbasis model : struktur dokumen sudah
diketahui– berbasis data : struktur diestimasi berdasarkan
data
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Pemetaan ke Struktur
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Ekstraksi Teks
• Pengenalan Karakter (Huruf / Angka /Simbol)– Machine Printed– Handwriting
• Persoalan Klasifikasi+ (disambiguasi)– k Nearest-Neighbor– ANN– SVM– ...
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Penutup
• Persoalan tampak sederhana• Teknologi Matang• Tahapan banyak• Titik berat pada Pengolahan & Domain
Knowledge• Perkembangan Teknologi• Ruang kontribusi untuk kondisi akuisisi yg
kurang terkendali