Title:
【発明の名称】適応型ダイナミックレンジ符号化装置
Document Type and Number:
Japanese Patent JP3106749
Kind Code:
B2
Abstract:
An adaptive dynamic range encoding method and device is disclosed, in which evaluation data mainly centered about the amount of the change in the spatial direction of picture data in a block is detected, and re-quantization is performed which will give a minimum value of the evaluation data. The re-quantization is performed at an optimum quantization step conforming to the picture in the block in such a manner that picture portion shaving the same level may remain at the same level after re-quantization. This renders it possible to eliminate quantization distortions form being produced in the reproduced picture.
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Inventors:
Tetsujiro Kondo
Kunio Kawaguchi
Kunio Kawaguchi
Application Number:
JP33059392A
Publication Date:
November 06, 2000
Filing Date:
December 10, 1992
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H03M7/50; G06T9/00; H04N1/41; H04N1/415; H04N19/00; H04N19/124; H04N19/134; H04N19/136; H04N19/154; H04N19/176; H04N19/186; H04N19/192; H04N19/196; H04N19/423; H04N19/85; H04N19/98; (IPC1-7): H03M7/50; H04N1/41; H04N1/415; H04N7/24
Domestic Patent References:
| JP61144989A | ||||
| JP461580A | ||||
| JP6169257A |
Attorney, Agent or Firm:
Akira Koike (2 outside)
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