| 摘要 |
It is aimed at decreasing process load for arithmetic coding and effectively providing rate control by suppressing image quality degradation. In an image encoding apparatus 1 , a code amount adding section 18 accumulates code amounts of arithmetic codes D 17 for each bit plane encoded in an EBCOT section 17 and supplies an accumulated value to a control section 19 . The control section 19 compares this accumulated value with a targeted code amount. When the accumulated value does not reach the targeted code amount, the control section 19 transmits a control signal D 19 to the EBCOT section 17 to encode the next bit plane. When the accumulated value reaches the targeted code amount, the code amount adding section 18 supplies an encoded code stream D 20 after completion of the code amount control to a header generation section 20 and a packet generation section 21 . At this time, the EBCOT section 17 encodes a quantization coefficient D 15 for each bit plane by traversing all code blocks from a bit plane having the highest bit position to a bit plane having the lowest bit position in order.
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