Image Acquisition Photo sensors Video camera

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Presentation transcript:

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

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

Vidicon 240-373 Image Processing

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

Video Image Capture use a device call --frame grabber-- 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

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

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

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

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

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