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AssigneeThe United States of America as represented by the Secretary of the Navy
InventorJames J. Meany
Estimating the term…
Techniques are provided for compressing and decompressing image data which may reduce the distortion that may otherwise be created by the compression of data values representative of null posts, overlays or other features that differ from the underlying image. In compression, at least one coefficient generated by a forward wavelet transform may be replaced with respective replacement coefficients. The transformed image data is then subjected to an inverse wavelet transform to generate modified image data in which the data values which differ from the underlying image have been replaced by interpolated or extrapolated values. The modified image data may be compressed in accordance with wavelet-based image compression. Alternatively, wavelet image compression may be applied directly to the coefficients resulting from the modified forward wavelet transform. In decompression, the compressed image data may be decompressed and data values representative of null posts or other features may be replaced with their original values.
A method of preparing image data comprising a plurality of data values for compression, the method comprising:
A computer program product for preparing image data comprising a plurality of data values to be compressed, the computer program product comprising at least one non-transitory computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising:
A method of subjecting image data comprising a plurality of data values to a modified forward wavelet transform, the method comprising:
Dependencies are inferred from the claim text.