Image insertion device for compressed video data

摘要

Input MPEG compressed data is input into a partial decoder and a logo insertion controller. A block DCT coefficients (a) output from the partial decoder is divided into a logo insertion region (c) and a non-logo insertion region (d) in a logo insertion region separator. Logo data (e) supplied from a logo information supply section is combined into the logo insertion region (c) with an arbitrary mixing ratio in a logo information insert section. In a logo region partial re-encoder, intra-frame coding of an image insertion region is executed when a starting frame for inserting an image is an intra-coded frame or a predictive coded frame, and, when the starting frame is a bidirectionally predictive-coded frame, inter-frame coding of the image insertion region is executed, and intra encoding of the image insertion region is executed in a frame to which the starting frame for inserting the image can refer.

主权项

1. An image insertion device for compressed video data, comprising:
a partial decoder for partially decoding of compressed video data which has been input; an image insertion region separator separating an image insertion region in the partially decoded video data; an image insertion unit for inserting an image into the image insertion region; a partial re-encoder for encoding and recompressing the image which has been inserted in the image insertion region; and a bit-amount control unit for controlling the bit amount of recompressed data with the partial re-encoder to a target bit amount, wherein the partial re-encoder determines an encoding mode of the image inserted in the image insertion region of a insertion starting frame for inserting the image, by which insertion of the image is started, according to a picture type of the insertion starting frame, wherein the partial re-encoder executes intra-frame coding of the image inserted in the image insertion region of the insertion starting frame when the insertion starting frame is an intra-coded frame, executes intra-frame coding of the image insertion region of the insertion starting frame when the insertion starting frame is a predictive-coded frame, andexecutes, when the insertion starting frame is bidirectionally predictive-coded frame, intra-frame coding of the image insertion region of a subsequent reference predictive-coded frame referred to by the insertion starting frame, and then executes unidirectionally inter-frame coding of the image insertion region of the insertion starting frame from the subsequent reference predictive-coded frame.