Depth Perception- Natalie Rhodes Pd 3

Monocular Cues- Depth cues such as interposition, relative size, and linear perspective available to each eye alone.

• Relative Size- If we assume two objects are similar in size we perceive the one that casts the smaller retinal image as farther away.

     Ex.- Relative size is used in paintings to add depth. Certain objects are depicted smaller than others to make them seem further away. Such as in the image below.

http://psych.hanover.edu/Krantz/art/scolls.jpg

• Relative Height- Objects higher in our field of vision are perceived as farther away; causes the illusion that taller objects are longer than shorter objects.

      Ex.- If you look at a landscape picture the objects in the foreground (such a a tree in this case), may seem to be the same size or even bigger than objects that are further away such as mountains. However, we know that mountains are much larger.

http://www.hdwallpaperscool.com/wp-content/uploads/2013/11/nature-landscape-beautiful-photos-best-desktop-landscape-hd-wallpapers-widescreen.jpg

• Relative Motion- As we move, objects that are stationary appear to move; the closer the object, the faster it appears to move.

      Ex.- If you go running you may think you are going fairly fast because objects near you are whizzing by, however if you look into the distance, objects that are further from you will not seem to be moving as fast.

http://www.daviddarling.info/images2/ship_moving_relative_to_jetty_1.jpg

• Interposition-If one object partially blocks the view of another, we perceive it as closer.

      Ex.- Placing one card on another (as shown below), and one card will seem further behind the other.

http://wps.prenhall.com/wps/media/objects/1029/1054447/images/3_31.gif

• Linear Perspective- Parallel lines seem to converge with distance; the greater the convergence, the greater the distance perceived.

      Ex.- Railroad tracks

http://azfoo.net/places/yucca/trip/13_Tracks.jpg

Binocular Cues- Visual information taken in by two eyes that enable us a sense of depth perception. 

• Retinal Disparity-The way that your left eye and your right eye view slightly different images. 

      Ex.- If you place your finger over an object fairly far away and close each ye one at a time the picture will be slightly different.

http://study.com/cimages/multimages/16/retinal_disparity.gif

• Convergence- The extent to which the eyes converge inward when looking at an object; the greater the inward strain, the closer the object.

      Ex.- When at the doctor's you may have been told to follow  pencil with your eyes. As you look at the tip of the pencil your eyes converge.

http://tonks.disted.camosun.bc.ca/courses/psyc110/percep/converg.gif