Apparatus for compressing and restoring image data using wavelet

Details Apparatus for compressing and restoring image data using wavelet Apparatus for compressing and restoring image data using wavelet

1997-03-20

2000-10-31

Mehta, Bhavesh

Image analysis

Image compression or coding

Pyramid, hierarchy, or tree structure

382233, 382250, G06K 946

Patent

active

061414522

ABSTRACT:
An apparatus for transforming image data using a Wavelet transform, including an image compressing apparatus having a Wavelet transforming unit for compressing digitized image data and an image restoring apparatus having an inverse Wavelet transforming unit for restoring image data compressed by the image compressing apparatus. The Wavelet transforming unit in the image compressing apparatus includes a unit for extending image data area to make the number of data of the object of transform in horizontal and vertical directions, with every one octave of resolution lowered when a Wavelet transform is conducted hierarchically based on multiple resolution analysis, thereby conducting a Wavelet transform on data of the interpolated image data area. The inverse Wavelet transforming unit in the image restoring apparatus includes a unit for reducing redundant portion generated by extension of image data area in the image data compression, with every one octave of resolution increased. Based on the above structure, it is possible to minimize zero area to reduce the computing time and capacity of memory used. It is also possible to estimate signal-to-noise ratio when data is reduced.

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patent: 5841890 (1998-11-01), Kraske

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