Title: Remote Sensing
1Remote Sensing
2Remote Sensing HUMAN VISION
- All image data must pass through the eye to be
interpreted - Physically the eye has features in common with a
camera
3Remote Sensing HUMAN VISION
- Very wide field of view
- Stereoscopic vision
- Blind spot
4Remote Sensing HUMAN VISION
5Remote Sensing HUMAN VISION
- The eye carries out high level image processing -
cameras do not. - Artefacts can be created during interpretation
- Remember the canals of Mars
6Remote Sensing HUMAN VISION
- COLOUR VISION
- Two types of light sensors
- Rods
- Cones
7Remote Sensing HUMAN VISION
- COLOUR VISION
- RODS
- Only detect grey levels
- Operate at low light levels
- Evenly distributed in the eye
- Can detect 16 - 24 shades of grey
8Remote Sensing HUMAN VISION
- COLOUR VISION
- CONES
- Three separate versions - blue, green, red
- Responsible for colour vision
- Operate at high light levels
- Concentrated in the eye center
- Can detect at least 8 million colours
9Remote Sensing HUMAN VISION
10Remote Sensing HUMAN VISION
11Remote Sensing HUMAN VISION
- COLOUR BLINDNESS
- Most common - green, red
- Red and green cones are shifted too close
together - Can detect greyscale better
12Remote Sensing HUMAN VISION
- COLOUR VIEWING
- Additive viewing
- Subtractive viewing
13Remote Sensing HUMAN VISION
- ADDITIVE COLOUR
- Blue, green, red primaries
- Mimics the operation of the eye
- Used in photography and Computer display
14Remote Sensing HUMAN VISION
15Remote Sensing HUMAN VISION
- SUBTRACTIVE COLOUR
- Cyan, yellow, magenta primaries
- Used in printing and painting
16Remote Sensing HUMAN VISION
- COLOUR CO-ORDINATE THEORY
- Hue, saturation and intensity
- Munsell colour charts
17Remote Sensing HUMAN VISION
18Remote Sensing HUMAN VISION
19Remote Sensing HUMAN VISION
20Remote Sensing HUMAN VISION