Smartphone Camera Technology
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- 1.Rough History of Photography Digital Sensors, Lenses, Zoom, Stabilization, Compression Best Practices for Shooting Video Week 4, University of Calgary Drama 571 Lecture prepared and presented by Dr. David Bunnell Smartphone Camera Technology Pelican Imaging's 16-lens camera module is designed for next-gen mobile devices coming in 2014. 1.
2. Rough History of Photography Mid 1800s Silver nitrate glass plates Early 1900s B&W silent movies Mid 1900s Colour talkies B&W TVs Late 1900s LCD TVs Digital photography Cellular phones Internet Early 2000s Digital movie making Smartphone cameras 2. 3. About Photographic Film Plastic coated with photosensitive emulsion. When light strikes the chemical it causes a reaction. Different formulas have different sensitivities to light. Film has a resolution of ~20 Megapixels. Film speed is a measure of how much light is required to cause the photochemical reaction. Slower, less reactive, film has finer grain (resolution) and better color fidelity. The camera shutter speed and aperture needs to be set within narrow range for successful photography. 3. 4. Digital Sensors Electronics control exposure time (shutter sound is artificial) Photons (light) energize electrons in CMOS (Complementary Metal Oxide Semiconductor) which can be collected by picture elements (pixels). There are colour filters on each pixel to allow only Red, Blue, or Green (RGB) light to pass to the semiconductor element. Smaller sensor chips have physically smaller pixels = more light is required to form an image. 4. 5. CMOS Sensor Chip Sony Image Sensor 5. 6. Apertures and Pixels Small aperture/lens = limited light, large depth of field Large aperture/lens = large amount light, small depth of field Small Sensor (slow film) needs more light Many pixels on small sensor = light spillage 6. 7. Basic Optics Object, aperture, Lens, shutter, sensor/film Small aperture gives greater depth of field 7. 8. Format Sensor size Pixel Pitch Camera 1/2.5 5.76x4.29mm