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Sensor Technologies Camera (CCD and CMOS) 11/04/2018 1 Dennis Christie - Universitas Gunadarma

Transcript of Sensor Technologiesmujahidin.staff.gunadarma.ac.id/Downloads/files/65742/materi_5.pdf · Sensor...

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Sensor TechnologiesCamera (CCD and CMOS)

11/04/2018

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Apa itu Melihat?Bagian 1

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Warna Dasar

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Merah + Hijau = Kuning?

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Merah + Hijau = Kuning?

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Mata | Komposisi Mata

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Mata | Light Sensitive Cones

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Mata | Cones Bereaksi Pada Gelombang Cahaya

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Mata | Cones Bereaksi Pada Gelombang Cahaya

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Percobaan RGB

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Mata | Cones Bereaksi Pada Gelombang Cahaya

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Mengapa Muncul Biru?

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Hijau + Biru?

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Merah + Biru?

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?

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Merah + Biru?

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Otak kita memiliki ide untuk menciptakanwarna yang membawa ke ujung spektrum warna, sedemikian sehingga terlihat masuk akal untuk kita.

Sangat luar biasa, bukan?

Sebagian besar waktu, otak kita merata-ratakan

panjang gelombang cahaya yang kita

lihat untuk menghasilkan warna.

Contoh:Merah + Hijau =

Kuning

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Merah + Hijau + Biru?

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Bagaimana Manusia Melihat

Bagian 2

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Camera Obscura

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Pinhole Camera Model

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Pinhole Camera Model

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Pinhole Camera Model

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Pinhole Camera Model

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Pinhole Camera with Lens

• Dengan lensa kita bisa mengatur fokus, sedemikian sehingga cahaya yang masuk dapat terfokus "hole" yang ada dalam pinhole camera

• Itulah mengapa kalian harus belajar fisika optik!

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Pinhole Camera Model Sederhana

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Bagaimana Komputer ‘Melihat’

Bagian 3

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‘Mata’ Komputer

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Webcam Camera DSLR Camera

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DSLR sebagai Webcam

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Struktur DSLR

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Cara Kerja DSLR | Keseluruhan

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Cara Kerja DSLR | Aperture

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Cara Kerja DSLR | Large Opening

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Cara Kerja DSLR | Small Opening

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Cara Kerja DSLR | Mirror

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Cara Kerja DSLR | Shutter

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Charge-coupled Device (CCD)

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CCD Layer | Micro Lenses

• Layer terluar.

• Menangkap cahaya dan memfokuskannya menuju area light-sensitive.

• Agar tidak ada cahaya yang terbuang.

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CCD Layer | Micro Lenses

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CCD Layer | Hot Mirror

• Hanya memperbolehkan cahaya tampak saja yang dapat masuk.

• Tergantung dari tipe kamera, jika kamera dikhususkan untuk menerima UV light atau infrared maka layer ini dihilangkan.

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CCD Layer | Bayer Filter

• Memisahkan cahaya masuk berdasarkan frekuensi tertentu.

• Merah, Hijau, Biru.

• Bayes Pattern. Dapat berbeda-beda tergantung tipe kamera, tapi memiliki tujuan yang sama

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CCD Layer | Bayer Filter

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CCD Layer | Photodiodes

• Energi cahaya dikonversikan menjadi charge, per masing-masing cell.

• CCD sebenarnya buta warna, yang disimpan hanya intensitas cahaya masing-masing cell.

• Pengelompokkan berdasarkan bayer filter memungkinkan untuk merepresenasikan warna

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CCD Layer | Depletion Layer

• Layer dimana charge dikumpulkan dan di transfer menuju processor

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CCD Layer | Depletion Layer

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CCD vs CMOS

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Complementary Metal-oxide Semiconductor (CMOS)

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CMOS | Rolling Shutter

• CMOS memiliki efek rolling shutter

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CMOS | Rolling Shutter

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