| 摘要 |
PURPOSE: A method is provided to insert a visual element into an encoded bit stream with minimal decoding of the encoded bit stream. CONSTITUTION: A method comprises the steps of receiving an encoded bit stream containing a picture, partially decoding a copy of the bit stream, determining if a segment of the picture in the bit stream is affected by the insertion of the visual element, re-encoding the segment if the segment is affected by the insertion of the visual element, and outputting the re-encoded bit stream. The encoded and re-encoded bit streams are MPEG-encoded bit streams. The re-encoded bit stream is output using a bit rate control process that randomly selects an initial processing point within the re-encoded bit stream, re-quantizes the re-encoded bit stream using a modified quantization table, and/or utilizes a slice-level stopping criteria for selectively starting or ending bit rate control. |
