| 摘要 |
FIELD: physics. ^ SUBSTANCE: imitation of film grain inside a receiver takes place by obtaining at least one unit of pre-calculated modified coefficients first. The said unit of modified coefficients undergoes filtration, corresponding to a frequency range which characterises the desired film grain structure. In practice the frequency range lies within the limits of the set of cut-off frequencies fHL, fVL, fHH and fVH of the filter in two measurements, which characterises the desired film grain structure. After this the filtered set of coefficients undergoes inverse transformation to obtain the film grain structure. ^ EFFECT: easier imitation of film grain in an image. ^ 15 cl, 4 dwg |
