STEREOSCOPIC VIEWING DEPTH PERCEPTION

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Sabrina Tyler
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1 STEREOSCOPIC VIEWING Center or Photogrammetri Training Ferris State University RC DEPTH PERCEPTION inoular vision apable o viewing with both eyes simultaneously Stereosopi viewing pereption o depth when viewing through binoular vision Monoular vision viewing with only one eye Monosopi viewing judging depth with one eye Stereosopi Viewing 1

DEPTH PERCEPTION Distanes pereived monosipially by Relative sizes o objets Hidden objets Shadows Dierening in ousing HUMAN EYE Pupil irular opening where light

2 DEPTH PERCEPTION Distanes pereived monosipially by Relative sizes o objets Hidden objets Shadows Dierening in ousing HUMAN EYE Pupil irular opening where light passes Proteted by ornea Light passes through lens and brought to ous at Central ovea Iris diaphragm Opti nerve sends sense o vision to brain Stereosopi Viewing 2

3 MACULA LUTEA STEREOSCOPIC DEPTH PERCEPTION When eyes i on point, optial aes onverge on that point, intersetion at an angle alled parallati angle (φ) Nearer objet, greater parallati angle b e eye base About 2.6 (63-69 mm) Depth between objets A and is D D A Stereosopi Viewing 3

4 VIEWING PHOTOS STEREOSCOPICALLY As A moves to A, image marks (a 1 and a 2 ) on transparent medium move loser together Parallati angle inreases and objet pereived nearer At A, marks (a 1 and a 2 ) move apart Parallati angle dereases and objet pereived arther away VIEWING PHOTOS STEREOSCOPICALLY 2 eposures made at L 1 and L 2 uilding on both photos is air base distane between eposures H is lying height above ground Top and bottom imaged on let photo at a 1 and b 1 and on right photo at a 2 and b 2 Stereosopi Viewing 4

VIEWING PHOTOS STEREOSCOPICALLY Plaing photos laid

height o building rom dierenes in parallati angle

5 VIEWING PHOTOS STEREOSCOPICALLY Plaing photos laid on table so let eye sees let image and right eye the right image Stereosopi model (alled stereomodel) appears below table top rain judges height o building rom dierenes in parallati angle STEREOSCOPES Poket stereosope Mirror stereosope Stereosopi Viewing 5

USE OF STEREOSCOPES Aurate & omortable stereosopi viewing requires eye base, line between enters o stereosope lenses, and light line be parallel Conjugate prinipal point (orresponding prinipal point

6 USE OF STEREOSCOPES Aurate & omortable stereosopi viewing requires eye base, line between enters o stereosope lenses, and light line be parallel Conjugate prinipal point (orresponding prinipal point Y-PARALLAX Slight amounts auses eye strain & eessive amounts prevent stereosopi viewing Causes o y-paralla Photos improperly oriented Unequal lying height between photos Tilt in photography Stereosopi Viewing 6

Apparent sale disparity between horizontal and vertial sales Primary ause: lak o equivalene between photographi base-height ratio, /H, and stereoviewing baseheight ratio, b e /h Vertial

7 Apparent sale disparity between horizontal and vertial sales Primary ause: lak o equivalene between photographi base-height ratio, /H, and stereoviewing baseheight ratio, b e /h Vertial Eaggeration - Causes Stereosopi Causes Viewing distane Separation o photographs Eye base magniiation Photographi Causes Photographi sale Altitude above terrain Air base Terrain relie Stereosopi Viewing 7

8 L L 1 2 b e k i k a h a A' K A C Z K' d C' z D From aerial geometry a Z a Z Subtrating Z a 2 From stereosopi geometry ( ) Z Stereosopi Viewing 8

9 From similar triangles b a e i h z a b ei h z b e i h b ei h Subtrating yields a b ei 2 h z hz Equating the 2 equations or a Z z b i 2 e Z h 2 ( ) hz ut Z and z are onsiderably smaller than H and h, thus Z b eiz h i h 2 2 ( ) h b e z Z Stereosopi Viewing 9

10 From similar triangles in 2 diagrams D k D ( ) k d i h From whih k d D h i d h ( ) i k Substitute into equation or z/z z d h Z D b e I h/(h b e ) is 1, there is no vertial eaggeration. Thus, magnitude o vertial eaggeration, V, is given by h V b e Stereosopi Viewing 10

11 d G PE 100 G From the igure G G PE 100 G 1 PE 100 From whih G d 1 PE 100 d G d Stereosopi Viewing 11

12 Eample (7-1): What is the approimate vertial eaggeration or a vertial photo taken with a mm oal length amera having a 23-m square ormat i the photos were taken with 60% endlap? Solution: Assuming b e /h is V ( appro. ) Stereosopi Viewing 12

Stereoscopic Models and Plotting

Stereoscopic Models and Plotting Stereoscopic Viewing Stereoscopic viewing is the way the depth perception of the objects through BINOCULAR vision with much greater accuracy. رؤيه البعد الثالث و االحساس