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WHAT IS AN OPTICAL ILLUSION ?

WHAT IS AN OPTICAL ILLUSION ?. illusions that deceive the human visual system into perceiving something that is not present or incorrectly perceiving what is present. Two ways they can happen.

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WHAT IS AN OPTICAL ILLUSION ?

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  1. WHAT IS AN OPTICAL ILLUSION ? • illusions that deceive the human visual system into perceiving something that is not present or incorrectly perceiving what is present.

  2. Two ways they can happen • Physiological - is the what happens to the eyes as a result of prolonged stimulation. i.e. after image effect • Cognitive Visual illusion - Exploits the predictive cues of early visual processing. Misdirects in-built assumptions or knowledge while processing.

  3. Four Types of Visual Illusions • Ambiguous Illusions - Ambiguous figures are 'two pictures in one' - looked at one way, you see one thing (e.g. a vase), but looked at another, you see something else (e.g. two faces in profile). • Distorting Illusions - are characterized by distortions of size, length, or curvature • Paradox illusions - are generated by objects that are paradoxical or impossible • Motion illusions – type of optical illusion in which a static image appears to be moving due to the cognitive effects of interacting color contrasts and shape position.

  4. OPTICAL ILLUSIONS WORK BY EXPLOITING VISUAL CUES SOME MONOCULAR CUES • Texture Gradient • Relative Motion Parallax • Linear Perspective • Light and Shadow • Relative Size

  5. OPTICAL ILLUSIONS WORK BY EXPLOITING VISUAL CUES Some Binocular Cues • Binocular Disparity • Convergence • Accommodation

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