Importance

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Abstract

A matrix switcher selectively seizes plural compressed pictures and converts P-frames in a GOP into I-frames while modifying prediction data of B-frames in the GOP. A decoder expands the compressed pictures into original pictures. An input buffer memory converts the picture signals into component signals while converting the transfer rate. A picture processing unit performs various picture signal processing operations on the picture signals. An encoder encodes the processed picture signals for compression. An output buffer memory converts the transfer rate of sent-out data which are compressed processed signals. A controller controls processing operations by the matrix switcher, decoder, input buffer memory, picture processing unit, encoder and the output buffer memory. The compressed pictures processed by inter-frame compression can be switched smoothly. Moreover, picture processing can be performed on a wide gamut of pictures from still pictures to moving pictures, free-format pictures, pictures not dependent on transfer rate and on scalable-format pictures.

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First Claim