Data transforming apparatus and control method thereof

Details Data transforming apparatus and control method thereof Data transforming apparatus and control method thereof

2011-03-29

2011-03-29

Tabatabai, Abolfazl (Department: 2624)

Image analysis

Image compression or coding

Lossless compression

C375S240180, C708S400000

Reexamination Certificate

active

07916962

ABSTRACT:
This invention implements a fast lossless transform almost free from a delay with a small calculation amount. The lossless transform can be used to perform lossless coding and lossy coding quickly. A first calculation unit multiplies data D0, D1, D2, and D3input to the input terminals by respective weighting coefficients {a0, a1, a2, a3} of {½, −½, −½, −½}, and summates the products. A rounding unit in the first calculation unit rounds the sum into an integer and outputs the integer value E. A second calculation unit multiplies the value E by weighting coefficients {b0, b1, b2, b3} of {−1, 1, 1, 1} set for the respective input data, and adds the products to the respective input data. This invention sets, for the relationship between the first and second weighting coefficients, a condition that a0*b0+a1*b1+a2*b2+a3*b3=−2 or 0.

REFERENCES:
patent: 7127115 (2006-10-01), Osawa et al.
patent: 7188132 (2007-03-01), Nakayama
patent: 7194140 (2007-03-01), Ito et al.
patent: 7257264 (2007-08-01), Nakayama et al.
patent: 2003-258645 (2003-09-01), None
Fukuma, Shinji et al. “Lossless 8-point fast discrete cosine transform using lossless hadamard transform”, IEICE Technical Report, IE99-65, pp. 37-44, Oct. 1999.; English abstract provided.

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