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Monocular and Binocular cues. Depth perception refers to our ability to judge distances Depth perception refers to our ability to judge distances If we.

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Presentation on theme: "Monocular and Binocular cues. Depth perception refers to our ability to judge distances Depth perception refers to our ability to judge distances If we."— Presentation transcript:

1 Monocular and Binocular cues

2 Depth perception refers to our ability to judge distances Depth perception refers to our ability to judge distances If we did not have depth perception what problems would we have? If we did not have depth perception what problems would we have? How do we see the world in 3D when the image displayed on our retina is 2D? How do we see the world in 3D when the image displayed on our retina is 2D?

3 Provide the information that lets us translate 2D information into 3D Provide the information that lets us translate 2D information into 3D Depth cues are sources of information from within our body (internal or primary depth cues) or from the environment (external secondary depth cues) that help us to perceive how far away objects are and therefore to perceive depth. Depth cues are sources of information from within our body (internal or primary depth cues) or from the environment (external secondary depth cues) that help us to perceive how far away objects are and therefore to perceive depth.

4 Binocular – requires the use of both eye to distinguish depth. Binocular – requires the use of both eye to distinguish depth. Used for close objects and used greatly to focus one these things Used for close objects and used greatly to focus one these things Both binocular cues are primary internal cues Both binocular cues are primary internal cues Monocular – requires the use of only one eye to perceive depth, but also operates with both eyes Monocular – requires the use of only one eye to perceive depth, but also operates with both eyes Used for pictorial cues and over longer distances Used for pictorial cues and over longer distances Some monocular cues are primary some are secondary Some monocular cues are primary some are secondary

5 Convergence Convergence Inward turning of the eyes to focus an image on the retina Inward turning of the eyes to focus an image on the retina The brain interprets greater tension in the eye muscles as an object gets closer and less tension as an object gets further away. The brain interprets greater tension in the eye muscles as an object gets closer and less tension as an object gets further away. Works within about 6m Works within about 6m

6 Retinal Disparity Retinal Disparity Our eyes are about 6-7 cm apart so each retina receives a slightly different image. Our eyes are about 6-7 cm apart so each retina receives a slightly different image. The difference in image decreases as the object gets further away. The difference in image decreases as the object gets further away. Work for objects up to 10m away. Work for objects up to 10m away. Images are compared in the brain and any difference give information about distance. Images are compared in the brain and any difference give information about distance.

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8 Accomodation Accomodation Accommodation involves the automatic adjustment of the shape of the lens to focus an object in response to changes in how far away the object is. Accommodation involves the automatic adjustment of the shape of the lens to focus an object in response to changes in how far away the object is. The flexibility of the lens enables it to bulge to fit (‘accommodate’) close objects on the retina The flexibility of the lens enables it to bulge to fit (‘accommodate’) close objects on the retina and to elongate (flatten) when looking at objects that are further away.and to elongate (flatten) when looking at objects that are further away.

9 Pictorial Cues Pictorial Cues Artist use them to create depth and distance on 2D sufaces. Artist use them to create depth and distance on 2D sufaces. Linear Perspactive Linear Perspactive Interposition Interposition Texture Gradient Texture Gradient Relative Size Relative Size Height in the Visual field Height in the Visual field

10 Linear Perspective Linear Perspective the apparent convergence of parallel lines as they recede (‘go back’) into the distance. the apparent convergence of parallel lines as they recede (‘go back’) into the distance.

11 Interposition Interposition occurs when one object partially blocks or occurs when one object partially blocks or covers another, and the partially blocked covers another, and the partially blocked object is perceived as further away than the object is perceived as further away than the object that obscures it (and vice versa). object that obscures it (and vice versa).

12 Texture gradient Texture gradient the gradual reduction of detail the gradual reduction of detail that occurs in a surface as it recedes into the distance, compared with a surface that is close and perceived in fine detail.

13 Relative Size Relative Size the tendency to visually perceive the object that produces the largest image on the retina as being closer, and the object that produces the smallest image on the retina as being further away. the tendency to visually perceive the object that produces the largest image on the retina as being closer, and the object that produces the smallest image on the retina as being further away. objects being perceived must be expected to be about the same size in real life. objects being perceived must be expected to be about the same size in real life.

14 Height in Visual Field Height in Visual Field objects that are located closer to the objects that are located closer to the horizon are perceived as being more distant than objects located further from the horizon.

15 All the Pictorial Cues in one picture of the Taj Mahal


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