Image-adaptive quantization for JPEG compression

Details Image-adaptive quantization for JPEG compression Image-adaptive quantization for JPEG compression

2004-12-20

2009-08-25

Ahmed, Samie A. (Department: 2624)

Image analysis

Image compression or coding

C382S250000, C382S251000, C382S262000, C375S240120

Reexamination Certificate

active

07580579

ABSTRACT:
In a method of digital image compression, the spatial frequency content of a digital image is characterized using a relatively sparse sampling of data blocks from the image, and a quantization table is constructed based on the characterization of the spatial frequency content.

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patent: 2005/0053281 (2005-03-01), Frazer
Rosenholtz, Ruth, “Perceptual Adaptive JPEG Coding”, IEEE International Conference on Image Processing, Lausanne, Switzerland, vol. 2, pp. 901-904 (1996).

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