Visual cues and constancies

• Visual cues

  Features of the environment that give us information about movement, distance, etc.
• Visual Constancies

  Objects look the same despite seeing them from different angles and distances
• Binocular depth cues

  Uses both eyes
• Monocular depth cues

  Only needs to use 1 eye
• Binocular- Retinal disparity

  Each eye sees thongs differently as they about 6cm apart on the face

  The difference between the left and right eye's view is used to work out depth and distance
• Binocular- Convergence

  The eyes become closer together when objects are close to us

  Muscles in the eye work harder when objects are close, information is sent to the brain to give information about depth and distance
• Monocular- Height in plane

  Objects that are higher in the visual field appear further away
• Monocular- Relative size

  Smaller objects in the visual field appear further away
• Monocular- Occlusion

  Objects that are in front of objects appear closer to us whilst objects behind others seem further away
• Monocular- Linear perspective

  When parallel lines converge in the distance, the point at which they come together is perceived to be further away