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Image Acquisition

Image Acquisition. Photo sensors Photo diodes and photo diode array Photo transistor Video camera. Primitive camera structure. Slotted board, rotating disc Photosensitive device Lens Illumination for object. Vidicon. Color Images.

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Image Acquisition

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  1. Image Acquisition • Photo sensors • Photo diodes and photo diode array • Photo transistor • Video camera 240-373 Image Processing

  2. Primitive camera structure • Slotted board, • rotating disc • Photosensitive device • Lens • Illumination for object 240-373 Image Processing

  3. Vidicon 240-373 Image Processing

  4. Color Images • involves the capture of 3 images simultaneously, r,g,b • placing filters over the lens of the camera is unsatisfactory • Use color stripes placed between lens and photo sensor 240-373 Image Processing

  5. Video Image Capture • use a device call --frame grabber-- r g --> 8-bit video A/D --> color converter--> mem --> color converter -->video DAC --> g b • ADC = 6 million conversion/sec, 160 ns per conversion 240-373 Image Processing

  6. Real-time capture • 25 frame/second minimum to avoid flickering • Must be done electronically • Example to grab image of 500x500 dot with 256 grey levels requires 6.25MB per sec. • Require lots of resources 240-373 Image Processing

  7. Image Scanner • Flat bed • Hand-held • for still images only • mechanical accuracy can be a problem 240-373 Image Processing

  8. Charge-Coupled Device (CCD) 240-373 Image Processing

  9. Image Display • Display monitors • CRT (Cathode-ray Tube) • based on R, G, B colors • Cannot display all colors that human can see • Black is not real black and white is not real white • LCD (Liquid Crystal Display) • Light weight • Low power consumption • Slow 240-373 Image Processing

  10. Image Display • Printers (mention dithering and patterning) • Dot matrix printers • Laser printers • Inkjet printers (use CMYK color model) • Thermal wax transfer printers • Dye sublimation printers 240-373 Image Processing

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