Distribution of coded files is increasingly growing. Signal processing after coding increases with the growth of distribution, and is becoming a significant burden in the media environment. New signal processing methods of addition, multiplication, and exchanging of coded regions are becoming important for suppressing delay, reducing the amount of calculation, and maintaining picture quality. Some of these processings had been tried as manipulating compressed images. In this paper, we consider signal processing in the coded region. They are logo insertion and non-linear editing. The logo insertion replaces parts of a coded file by other coded logo data. The problem of moving frame is analyzed. Dissolve is one of typical non-linear editing operations in the coded region. Replacing B-pictures by pre-coded deta, a new dissolve effect is realized. The proposed system does not degrade picture quality from the pre-coded level and does reduce file size.
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