| 摘要 |
A the picture-encoding apparatus provided by the present invention includes a wavelet transformation unit for carrying out wavelet transformation on an input picture to generate wavelet-transformation coefficients, a bit-plane encoding-pass-generating unit for spreading the wavelet-transformation coefficients over bit-planes, an arithmetic encoding unit for carrying out an arithmetic encoding process in an encoding pass, a rate control unit for controlling an encoded-data quantity of the generated arithmetic code so as to achieve a target encoded-data quantity, a header-generating unit for generating a header, a packet-generating unit for generating a packet by addition of the header to the arithmetic code experiencing control of the encoded-data quantity executed by the rate control unit, and an encoded-code-stream-truncating means for truncating an encoded-code stream completing processing through all the encoding passes by discarding a rear portion of the stream so as to make an encoded-data quantity of the stream equal to a target encoded-data quantity.
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