Method and apparatus for controlling a quantity of codes represe

Details Method and apparatus for controlling a quantity of codes represe Method and apparatus for controlling a quantity of codes represe

1997-08-06

1999-06-08

Boudreau, Leo H.

Image analysis

Image compression or coding

382239, 382248, 348403, 348404, G06K 936

Patent

active

059110066

ABSTRACT:
A method and an apparatus for controlling the quantity of codes representative of image data are disclosed. Image data representative of a single scene are thinned and then subjected to orthogonal transform in order to generate transform coefficients. The transform coefficients are normalized in accordance with the initial value of a normalization factor and then coded by compression. The quantity of the resulting codes is compared with a first target value. A value of the normalization factor corresponding to the first target value is calculated on the basis of the result of the above comparison in accordance with a relation between the normalization factor and the quantity of codes. Subsequently, the entire image data representative of a single scene are subjected to orthogonal transform, and the resulting transform coefficients are normalized by the above value of the normalization factor. The transform coefficients normalized by this normalization are coded by compression. The quantity of the resulting codes is compared with a second target value. A value of the normalization factor corresponding to the second target value is calculated on the basis of the result of the comparison using the second target value. The value corresponding to the second target value is used to repeat the normalization of the transform coefficients and coding. Such a procedure is repeated until the count of the compressed data satisfies the second target value within a preselected range.

REFERENCES:
patent: 5086488 (1992-02-01), Kato et al.
patent: 5732156 (1998-03-01), Watanabe et al.
W. Chen, "Scene Adaptive Coder", IEEE, Trans. on Comm. vol. Com-32, No. 3, pp. 225-232, (Mar. 1984).

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