1. Image Acquisition Photo sensors Video camera
Photo diodes and photo diode array
Photo transistor
Video camera
Image Processing

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

3. Vidicon
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
Image Processing

5. 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
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
Image Processing

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

8. Charge-Coupled Device (CCD)
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
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
Image Processing