| 摘要 |
A transcoder has been disclosed, which does not produce extra high frequency components or lower the compression rate even when the size of a decoded image is changed and the boundaries of macro blocks at the time of decoding and the boundaries of macro blocks at the time of re-encoding do not match each other. The transcoder comprises: a decoder that decodes image data encoded in a first format and outputs a decoded image; and an encoder that re-encodes the decoded image data into a second format, and further comprising: a scaler that changes the size of the decoded image; and a filter that carries out filtering processing for reducing high frequency components for pixels in the vicinity of the boundaries of macro blocks of the decoder in the decoded image, which do not match the boundaries of macro blocks of the encoder before or after the size is changed.
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