Function Contrast in illumination help detect object edges whether is it day

Function contrast in illumination help detect object

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Function: Contrast in illumination help detect object edges, whether is it day time/ night time, whether indoors/ outdoors etc.
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§ Cornea: Transparent tissue which allows light rays to enter the eye and focus on objects. Iris/Pupil: Coloured part of the eye, consists of muscular diaphragm which regulated light entering the eye by expanding and contracting the pupil (centre of the iris). Lens: Crystalline lens inside the eye that enables the changing of focus. Fovea: Small pit that contains the highest concentration of colour sensitive light receptors – has the highest visual acuity in the retina. o VISUAL CORTEX Receptive fields of individual neurons in V1: Orientation selectivity: Hubel and Wiesel 1958 Receptive fields of striate cortex are not circular (like the RGC fields) but elongated. Simple cells: Neuron fires vigorously when the line is orientated in particular angle, but reduces when not. Complex cells: Fire most when lines are in certain motion. o VISUAL PATHWAYS Processing after visual cortex. What stream Ventral stream → Temporal lobe Object recognition Where stream Dorsal → Parietal lobe Location of objects in space o VISION PERCEPTION: Gestalt Principles Gestalt is a psychological term that means “unified whole”. Refers to theories of visual perception developed by German psychologists in the 1920s Gestalt psychology describes how people tend to organise visual elements into whole entities. Gestalt psychologists believe we are born with specific predisposed ways of organizing information so that it has utility. Six Gestalt Principles Principle of Figure-Ground: The eye differentiates an object form its surrounding area. A form, silhouette, or shape is naturally perceived as figure (object), while the surrounding area is perceived as ground (background).
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Principle of Proximity: Occurs when elements are placed close together. They tend to be perceived as a group. Principle of Similarity: Occurs when objects look similar to one another. People often perceive them as a group pattern.
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