Depth Perception.

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Presentation transcript:

Depth Perception

Depth perception, Size & Distance of objects Depth perception, size of objects, and distance are ascertained through: - Monocular and - Binocular cues.

Determination of the distance 3 methods for the determination of the distance of the objects from the eyes Size of image of known objects Phenomenon of moving parallax Phenomenon of stereopsis

Size of image of known objects Image of the far objects is smaller than the nearer objects Brain knows the size of the image of known object when they are near and change in size when the same objects is far away Brain automatically calculates the distance from this

Phenomenon of moving parallax Image of the nearer objects moves more across the retina, with the movement of the eye Very near objects are out of field of vision with small movement of eyes or head Far objects image remains on the retina even with tremendous movement of the eye or head From this phenomenon brain estimates the relative distances of the objects

Moving Parallex- Note:Distant objects moves slowly than Nearer Objects

Phenomenon of stereopsis Binocular vision Object very near to the eyes forms images on the temporal side of the retinae As the object moves away from the eyes the two images in the two eyes come more towards the nasal sides of the retinae Nearer objects have more un-fused points of the two images than the far objects From these two phenomenon of binocular vision brain can estimate the distance of the objects

Distance perception by size and stereopsis

Geometric Basis of Steropsis When a person stares at an object, the two eyes converge so that the object appears at the center of the retina (corresponding points) in both eyes. Other objects around the main object of interest appear shifted in relation to the main object