Title:
IMAGE ENCODING METHOD AND IMAGE ENCODING DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/105621
Kind Code:
A1
Abstract:
The present invention, which reduces buffer delay while minimizing image-quality degradation, performs low-delay video encoding. This image encoding method is provided with the following steps: a quantization step in which inputted information is quantized on the basis of the value of a quantization parameter, thereby reducing the size of said information; an entropy-encoding step in which the output of the quantization step is subjected to an entropy-encoding process and the resulting encoded information is outputted along with information on the size of said encoded information; and a rate-control step in which the value of the quantization parameter is determined on the basis of the size of the aforementioned encoded information. In the rate-control step, for each block, said blocks being smaller than frames, the value of the quantization parameter is increased if the bit allocation within said block is predicted to exceed a prescribed value but decreased if the bit allocation within said block is predicted to be less than said prescribed value.
Inventors:
MIZOSOE HIROKI (JP)
KOMI HIRONORI (JP)
OKADA MITSUHIRO (JP)
SASAMOTO MANABU (JP)
KOMI HIRONORI (JP)
OKADA MITSUHIRO (JP)
SASAMOTO MANABU (JP)
Application Number:
PCT/JP2013/050354
Publication Date:
July 18, 2013
Filing Date:
January 11, 2013
Export Citation:
Assignee:
HITACHI CONSUMER ELECTRONICS (JP)
International Classes:
H04N7/26
Foreign References:
| JPH104546A | 1998-01-06 | |||
| JP2000217114A | 2000-08-04 | |||
| JPH03263927A | 1991-11-25 |
Attorney, Agent or Firm:
INOUE, Manabu et al. (JP)
Manabu Inoue (JP)
Manabu Inoue (JP)
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Claims: