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

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Matrices and digital pictures l.jpg

Matrices and Digital Pictures

Part I - Matrix representation of digital pictures.


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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


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Digital vs. Analog

7:52

7:52:02


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19 x 25

475 pixels

256 colors


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16 times more pixels

75 x 100

7,500 pixels

256 colors


Slide6 l.jpg

16 times more pixels

300 x 400

120,000 pixels

256 colors

75 x 100

256 colors

19 x 25

256 colors


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16 times more pixels

1200 x 1600

1,920,000 pixels

millions of colors

(24 bit true color)


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+

_

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



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  • 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


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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


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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.


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Digital X-Ray

General Electric


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Represent data with colors, i.e. grades.

90-100

80-90

70-80

60-70

<60

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