Matrices and Digital Pictures

# Matrices and Digital Pictures

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## Matrices and Digital Pictures

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1. Matrices and Digital Pictures Part I - Matrix representation of digital pictures.

2. 1 2 3 4 5 6 7 8 4 2 2 2 4 2 8 4 2 4 8 4 4 3 2 3 4 2 2 2 3 3 2 2 2 2 2 3 2 2 3 3 3 3 3 3 Picture Matrix Color map

3. Digital vs. Analog 7:52 7:52:02

4. 19 x 25 475 pixels 256 colors

5. 16 times more pixels 75 x 100 7,500 pixels 256 colors

6. 16 times more pixels 300 x 400 120,000 pixels 256 colors 75 x 100 256 colors 19 x 25 256 colors

7. 16 times more pixels 1200 x 1600 1,920,000 pixels millions of colors (24 bit true color)

8. + _ Photon Charge-Coupled Device (CCD) Howstuffworks.com Photons strike the CCD. The CCD produces a charge equivalent to the number of photons. A chip measures the charge and stores the information as a number

9. Lawrence Berkeley Laboratory

10. CCDs can only measure intensity • Filters are needed to measure the intensity of a single color. • Color pictures require 3 matrices • red • green • blue • Therefore 3 CCDs

11. A single CCD is preferred Pixels with different color filters are alternated. The intensity of each color at each pixel is determined by either the pixel itself or the average of the neighboring pixels Howstuffworks.com

12. FLIR Systems Infrared Sensing: Everything above absolute zero emits infrared electromagnetic waves. The intensity of these waves is proportional to the temperature of the object.

13. Digital X-Ray General Electric

14. Represent data with colors, i.e. grades. 90-100 80-90 70-80 60-70 <60 Your Class Another Class