Noise insertion

Given a scene $G$, the random vector $W = \left(w_i\right)_{1 \leq i \leq n}$ is embedded into $G$ by

1. wrapping each atomic $w_i$ by a graphical object: let denote it $\omega_i$, then we obtain a vector of objects $\Omega = \left(\omega_i\right)_{1 \leq i \leq n}$.

2. inserting $\Omega$ into $G$ so that every $\omega_i$ contributes to the rendered image, namely they distort this image. The distortion is kept to be lower than the human perception of light [10], [11].