| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce a processing load of arithmetic encoding and to effectively perform a rate control by suppressing an image quality deterioration. <P>SOLUTION: In an image encoding device 1, an encoding amount adding portion 18 accumulates an encoding amount of an arithmetic code D17 per bit plane encoded by an EBCOT portion 17, and an accumulated value is supplied to a control portion 19. The control portion 19 compares the accumulated value with a target encoding amount, and when the accumulated value does not reach the target encoding amount, a control signal D19 is transmitted to the EBCOT portion 17 for encoding a subsequent bit plane. The encoding amount adding portion 18 supplies an arithmetic code D20 after completing an encoding amount control to a header generating portion 20 and a packet generating portion 21 when the accumulated value reaches the target encoding amount. At this time, the EBCOT portion 17 encodes an quantization coefficient D15 per bit plane in an order from a bit plane whose bit position is the highest to a bit plane whose bit position is the lowest, crossing all of encoding blocks. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
