| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To decrease a process load for arithmetic coding and perform an effective rate control by suppressing degradation in image quality. <P>SOLUTION: In an image encoding apparatus 1, a code amount adding section 18 accumulates code amounts of arithmetic codes D17 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 D19 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 arithmetic code D20 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 quantization coefficient D15 for each bit place, by covering all code blocks from a bit plane having the highest bit position to a bit plane having the lowest bit position, in the order. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
