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02Imageformation

02Imageformation - January 2010 Image formation&...

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Unformatted text preview: January 2010 Image formation & processing Sunday, January 10, 2010 Image Formation • Geometry of image formation – (camera models and calibration) – where? • Radiometry of image formation – how bright? 2 Sunday, January 10, 2010 Digital images ‣ We’re interested in digital images, which may come from – An image originally recorded on film ♦ Digitized from negative or from print – Analog video camera ♦ Digitized by frame grabber – Digital still camera or video camera – Sonar, radar, ladar (laser radar) – Various kinds of spectral or multispectral sensors ♦ Infrared, X-ray, Landsat… ‣ Normally, we’ll assume a digital camera (or digitized analog camera) to be our source, and most generally a video camera (spatial and temporal sampling) 3 Sunday, January 10, 2010 What is a Camera? • A camera has many components – Optics: lens, filters, prisms, mirrors, aperture – Imager: array of sensing elements (1D or 2D) – Scanning electronics – Signal processing – ADC: sampling, quantizing, encoding, compression ♦ May be done by external frame grabber (“digitizer”) Sunday, January 10, 2010 What is a Camera? • A camera has many components – Optics: lens, filters, prisms, mirrors, aperture – Imager: array of sensing elements (1D or 2D) – Scanning electronics – Signal processing – ADC: sampling, quantizing, encoding, compression ♦ May be done by external frame grabber (“digitizer”) • And many descriptive features – Imager type: CCD or CMOS – Imager number – SNR – Lens mount – Color or B/W – Analog or digital (output) – Frame rate – Manual/automatic controls – Shutter speeds – Size, weight – Cost Sunday, January 10, 2010 Camera output: A raster image • Raster scan – A series of horizontal scan lines, top to bottom – Progressive scan – Line 1, then line 2, then line 3, … – Interlaced scan – Odd lines then even lines Sunday, January 10, 2010 Camera output: A raster image • Raster scan – A series of horizontal scan lines, top to bottom – Progressive scan – Line 1, then line 2, then line 3, … – Interlaced scan – Odd lines then even lines Raster pattern Progressive scan Sunday, January 10, 2010 Camera output: A raster image • Raster scan – A series of horizontal scan lines, top to bottom – Progressive scan – Line 1, then line 2, then line 3, … – Interlaced scan – Odd lines then even lines Raster pattern Progressive scan Interlaced scan Sunday, January 10, 2010 Camera output: A raster image • Raster scan – A series of horizontal scan lines, top to bottom – Progressive scan – Line 1, then line 2, then line 3, … – Interlaced scan – Odd lines then even lines Raster pattern Progressive scan Interlaced scan Sunday, January 10, 2010 Camera output: A raster image • Raster scan – A series of horizontal scan lines, top to bottom – Progressive scan – Line 1, then line 2, then line 3, … – Interlaced scan – Odd lines then even lines Raster pattern Progressive scan Interlaced scan Sunday, January 10, 2010 Camera output: A raster image...
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02Imageformation - January 2010 Image formation&...

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