Image scaling in the compressed domain

Details Image scaling in the compressed domain Image scaling in the compressed domain

2006-05-23

2006-05-23

Do, Anh Hong (Department: 2627)

Image analysis

Image transformation or preprocessing

Changing the image coordinates

C382S232000, C382S240000, C382S250000, C382S251000

Reexamination Certificate

active

07050656

ABSTRACT:
An efficient compressed-domain-based algorithm that works by combining the IDCT and pixel-domain averaging into a single compressed domain operation, where a part of the cost of even this simplified operation can be absorbed into the de-quantization process. The original image need not be decompressed fully, only to the point of extracting the transform coefficients. Compressed-domain scaling for all scales k/8 for 1≦k≦8, including ⅜, ⅝, ¾, ⅞, is provided. By chaining multiple operations, any scale factors of the form k1k2. . . kl/8lfor integers ki's in the range [1,7] can be achieved.

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