Image compressing apparatus that achieves desired code amount

Details Image compressing apparatus that achieves desired code amount Image compressing apparatus that achieves desired code amount

2004-03-24

2008-10-21

Couso, Jose L (Department: 2624)

Image analysis

Image compression or coding

Adaptive coding

Reexamination Certificate

active

07440630

ABSTRACT:
An apparatus for compressing an image, comprising: a coding unit configured to generate code data by encoding data derived from image data; a memory unit which stores truncation data items identified by respective data sequence numbers, wherein a truncation data item specifies a way in which code data is removed from the generated code data, such that the larger the data sequence number, the higher a quality of a reproduced image obtained by decoding the generated code data after the removal of code data, or such that the larger the data sequence number, the lower the quality of the reproduced image; and a rate control unit configured to identify a data sequence number of a truncation data item that provides a code data parameter substantially equal to a desired value, said code data parameter being responsive to an amount of code data removal.

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“An overview of the JPEG 2000 still image compression standard”, Majid Rabbani et al., Signal Processing: Image Communication 17 (2002) 3-48.
Ikurou Ueno et al. “Ouline of New International Standard For Coding of Still Image (JPEG2000)”, Journal of the Institute of Image Information and Television Engineers, vol. 54, No. 2, pp. 164-171.

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