Measuring AnglesMeasuring AnglesIn Digital ImagesIn Digital Images

Presented by Presented by Stephen SchneiderStephen Schneider

Angles in Nature

leaf branching angles

Eratosthenes: The Size of the

Earth

Eratosthenes realized: Distance/Circumference = Angle / 360

(from Cairo) Circumference = 700 km × 360 / Angle = …

Circumference = 700 km × 360 / 6.5° = 38769.2308 km

Circumference = 700 km × 360 / 6.5° = 38769.2308 km ≈ 40,000 km

Circumference = 700 km × 360 / 6.5°

Eratosthenes: The Size of the

Earth (cont)

Eratosthenes realized: Distance/Circumference

= Angle / 360

Human Family Tree

Facial Slope

Try to line up teeth (near and far) so they make a straight line —unlike this image

Facial Recognition

What other angles do you think might be diagnostic?