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Emission theory or extramission theory (variants: extromission) or extromissionism is the proposal that visual perception is accomplished by eye beams emitted by the eyes. This theory has been replaced by intromission theory (or intromissionism ), which is that visual perception comes from something representative of the object (later ...
Because Optics contributed a new dimension to the study of vision, it influenced later scientists. In particular, Ptolemy used Euclid's mathematical treatment of vision and his idea of a visual cone in combination with physical theories in Ptolemy's Optics, which has been called "one of the most important works on optics written before Newton". [4]
Dice; Playing card; Game board (or simply board) – the (usually quadrilateral) surface on which one plays a board game; the namesake of the board game, gameboards would seem to be a necessary and sufficient condition of the genre, though card games that do not use a standard deck of cards (as well as games which use neither cards nor a game board) are often colloquially included.
His theory of vision follows Alhacen and he does not consider Bacon's concept of species, although passages in his work demonstrate that he was influenced by Bacon's ideas. Judging from the number of surviving manuscripts, his work was not as influential as those of Pecham and Bacon, yet his importance, and that of Pecham, grew with the ...
The theory of optical flow derives from concepts of active perception, and while optical flow is now typically considered a vector representation of motion captured by a vision sensor (camera), it was originally described in terms of active perception. The behavior of the agent (animal, robot, human) in the world generates a flow of data over ...
Ptolemy also presents a theory of vision. In his view, rays (or flux) are emitted from the eye. The rays are sensitive, and convey information back to the observer's intellect about the distance and orientation of surfaces. Size and shape were determined by the visual angle subtended at the eye combined with perceived distance and orientation.
Ibn al-Haytham was the first to correctly explain the theory of vision, [14] and to argue that vision occurs in the brain, pointing to observations that it is subjective and affected by personal experience. [15] He also stated the principle of least time for refraction which would later become Fermat's principle. [16]
Constant sum: A game is a constant sum game if the sum of the payoffs to every player are the same for every single set of strategies. In these games, one player gains if and only if another player loses. A constant sum game can be converted into a zero sum game by subtracting a fixed value from all payoffs, leaving their relative order unchanged.