3. The processing system according to claim 1 , wherein, when the annotation is being coded into the real-time transmission of the presentation, the encoder utilizes the second copy of the raw images as annotated raw images.
3. The processing system according to claim 1 , wherein, when the annotation is being coded into the real-time transmission of the presentation, the encoder utilizes the second copy of the raw images as annotated raw images. 4. The processing system according to claim 3 , wherein: the memory buffer includes logically or physically separated first, second and third buffers; the first buffer stores the raw images of the presentation in the uncoded state; and the second and third buffers respectively store the first and second copies of the raw images.