Adaptive generation of Q-table2 for improved image quality

Details Adaptive generation of Q-table2 for improved image quality Adaptive generation of Q-table2 for improved image quality

2006-10-10

2006-10-10

Dang, Duy M. (Department: 2624)

Image analysis

Image compression or coding

Adaptive coding

C382S251000

Reexamination Certificate

active

07120303

ABSTRACT:
Brightness correction and image enhancement are derived to compensate for changes in captured image data by hardware scanners and the like by statistically measuring the captured data and generating or selecting a compensation quantization table to be substituted in image data encoded for compression. Three techniques of compensation usable singly or in combination are provided which may be used in combination with techniques for dynamic range reduction for extreme compression. Thus, improved images which may be enhanced in any desired manner, for example, to conform to an established image standard, may be derived from data having sufficient compression to allow economically acceptable long-term storage in high-speed access storage media even though the data captured is degraded in dynamic range, brightness and the like.

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