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0914 Question

1. How Mouse Works

Pointing device detect two-dimensional motion

  1. Physical movement
  2. Optical sensor, omit light downward, next to a tiny camera
  3. Surface reflection, take pictures per second (often thousands)
  4. Signal Processing: compare consecutive images
  5. Translation to cursor movement

1.1. Camera?

Resolution: just 16x16 or 30x30, the reason to process fast

Surface imaging: works by looking for patterns and irregularities on the surface

1.2. Algorithm

Find the shift or displacement

Cross-correlation methods

2. How to Act Genuine

  • Specific
  • Timely
  • Quality over Quantity
  • Tone
  • Listen actively

3. How Eraser/Rubbers Works

  • Friction, cause the particles to be lifted
  • Stickiness
  • Crumbling: the shedding property is purposeful, so the eraser continually present a fresh surface

4. Why Nikon Lens Brand Nikkor

Since 1930, R from an earlier company name

  • Japan Optical
  • Nippon Kogaku

R? The suffix that was traditionally used in the naming of lenses

5. Macro? Micro?

From Ancient Greek