1_3_digitalimaging

1_3_digitalimaging - Introduction to digital imaging FROM...

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Introduction to digital imaging FROM LIGHT TO PIXELS… Stephen Johnson The Digital Path
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FOUNDATIONS OF DIGITAL IMAGING From Light to Pixels From Pixels to Image Capturing digital images
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FROM LIGHT TO PIXELS Digital imaging* – The process of acquiring an electronic snapshot of a scene or document (i.e. photographs, printed texts, paintings, etc.) The digital file, using binary code, is made up of pixels, or picture elements, that are assigned a tonal value of black, white, varying shades of gray, or color. – These type of images are known as bitmaps. • Characteristics: Dimension, Bit Depth, Color Model
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FROM LIGHT TO PIXELS Why Digital Imaging?* – Immediacy – Connection to the moment – Control over results – Versatility – Accuracy
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FROM LIGHT TO PIXELS The Digital Path* – Scene – Camera Lens – Silicon Sensor – Pixels – Analog to Digital Converter – Binary Data
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FROM LIGHT TO PIXELS Digital Path From Stephen Johnson’s On Digital Photography
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FROM LIGHT TO PIXELS Sensors* – Light-sensitive silicon sensor – The electronic “film” of the camera – In a digital camera, the resolution is defined by the number of sensing sites on the sensor – Two main types: • Charged Coupled Device (CCD) • Complimentary Metal Oxide Semiconductor (CMOS)
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FROM LIGHT TO PIXELS Sensors Film-based cameras record on silver-salt coated material. Digital devices capture light through electronic light sensors. Both use Red, Green, Blue filters to record color information.
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Sensor types* – Charged Coupled Device (CCD)* • Solid-state light sensor with photographic capabilities- convert light photons to electrical currents using light-detecting silicon • Invented by Bell Labs scientists, 1969 • Passive pixel sensor- separate image sensor and processor (slower image processing) • Technology used in many professional digital cameras and scanners
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1_3_digitalimaging - Introduction to digital imaging FROM...

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