Method for simulating film grain by mosaicing pre-computed...

H - Electricity – 04 – N

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H04N 7/26 (2006.01)

Patent

CA 2538785

Film grain is simulated in an output image (19) using pre-established blocks of film grain (408) from a pool (408) of pre-established blocks. Successive film grain blocks are selected by matching the average intensity of a block from the pool to the average intensity of a successive one of a set of M x N pixels in an incoming image. Once all of the successive pixel blocks from the image are matched to selected film grain blocks, the selected film grain blocks are "mosaiced", that is composited into a larger image mapped to the incoming image.

On simule le grain du film dans une image de sortie (19) au moyen de blocs préétablis de grain de film (408) à partir d'un regroupement (408) de blocs préétablis. Des blocs de grain de film successifs sont sélectionnés par une mise en correspondance de l'intensité moyenne d'un bloc issu de ce regroupement avec l'intensité moyenne d'un bloc successif d'un ensemble de M x N pixels dans une image entrante. Une fois que ces blocs de pixels successifs d'une image sont mis en correspondance avec des blocs de grain de film sélectionnés, les blocs de grain de film sélectionnés sont assemblés <= mosaïque >=, c'est-à-dire composés en une image plus grande mise en correspondance avec l'image entrante.

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