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US09177364B2 Film grain simulation method based on pre-computed transform coefficients 有权
基于预先计算的变换系数的胶片颗粒模拟方法

Film grain simulation method based on pre-computed transform coefficients
Abstract:
Film grain simulation within a receiver occurs by first obtaining at least one block of pre-computed transformed coefficients. The block of pre-computed transformed coefficients undergoes filtering responsive to a frequency range that characterizes a desired pattern of the film grain. In practice, the frequency range lies within a set of cut frequencies fHL, fVL, fHH and fVH of a filter in two dimensions that characterizes a desired film grain pattern. Thereafter, the filtered set of coefficients undergoes an inverse transform to yield the film grain pattern.
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