Depth perception presented by Aakriti Joshi

common visual illusions related to depth perception

1. Depth perception Self assessment question and answer Presenter Aakriti Joshi

2. 3. What are some common visual illusions related to depth perception? Erroneous perception Visual illusions related to depth perceptions are:- Size illusion 2. Color and Brightness illusion a. Corridor illusion b. Moon illusion c. Müller- Lyer Illusion

3. Perception of Object Size with Distance Constant Perception: The apparent size of an object remains constant despite changes in retinal image size. Example: An automobile appears the same size whether it is near or far. Retinal Image: Nearby objects produce larger retinal images, but they are not perceived as larger.

4. Size illusion Size Constancy: Our visual system compensates for differences in retinal image size by considering the relative distance of an object. Failure of Size Constancy: When distance judgments are erroneous, such as when viewing a flat picture, size constancy can fail Size I llusion: This failure leads to size illusions, where objects appear larger or smaller than they actually are.

5. 1. Corridor illusion Monocular Depth Cues: Size constancy fails because these cues provide inaccurate information about relative distance. Two cylindrical shells are equidistant from our eyes Top one perceived farther away Top cylindrical shell appear larger Both have same dimensions

6. 2. Moon illusion Observation: The moon appears larger on the horizon than at its zenith. Angular Subtense: The moon's angular size remains the same in both positions. Cause: Interposing objects (trees, houses, fields) make the moon seem farther away on the horizon. Effect: This perceived increased distance causes the moon to appear larger.

7. 3. Müller- Lyer Illusion Understanding the Illusion: Consider vertical lines as corners of a room. Ingoing Corner: The line forming an ingoing corner appears longer. Equal Length Lines: Both lines produce equally sized retinal images. Perceived Distance: The line judged to be farther away is perceived as longer.

8. Color and brightness illusion A phenomenon that happens when two adjacent colors influence each other. C hanges our perception of the colors (more or less saturated, more or less bright). C an be observed both with different hues, or luminosities.