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Method and apparatus for digital data compression
| Details |
Inventors: Persiantsev, Michael I.; Gubbi, Rajugopal R.; Harwood, Joseph D.;
Assignee: Sharewave, Inc. (El Dorado Hills, CA)
Primary Examiner: Couso; Jose L.
Assistant Examiner:
Attorney, Agent or Firm: Blakely Sokoloff Taylor & Zafman LLP
The quality of digital images recovered from compressed data in an inter-frame redundancy-removing scheme is enhanced using a self-adaptive feedback scheme in an image compression/decompression system so as to include means for the compensation of the distortion component from prior frame compression in subsequent difference frame compression. Each transmitted frame is stored after a full compress/decompress cycle, and difference data (which includes the inverse of the distortion component from compression of the transmitted frame) representing the difference between the stored frame and the incoming new frame is transmitted. Consequently, the quality of static regions in the recovered images may be improved with each subsequent iteration by taking the distortion component in the prior frame into consideration along with the inter-frame motion information. The feedback loop thus forms a self-adaptive iterative cycle. |
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DETAILED DESCRIPTION In one embodiment, a method for enhancing the quality of digital images recovered from compressed data in an inter-frame redundancy-removing scheme is provided.
Briefly, a self-adaptive feedback scheme is deployed in an image compression/decompression system so as to include means for the compensation of the distortion component from prior frame compression in subsequent difference frame compression.
This may be implemented by storing each transmitted frame after a full compress/decompress cycle, and transmitting the difference data (which includes the inverse, or negative, of the distortion component from compression of the transmitted frame) representing the difference between the stored frame and the incoming new frame.
Consequently, the quality of static regions in the recovered images may be improved with each subsequent iteration by taking the distortion component in the prior frame into consideration along with the inter-frame motion information.
The feedback loop thus forms a self-adaptive iterative cycle.
In a further embodiment, wavelet analysis is deployed to enhance the efficiency of a data compression scheme that employs adaptive feedback.
Each incoming image frame represented in the spatial domain is transformed into the wavelet domain before being compressed and transmitted (e.
g.
, to a remote receiver).
The compressed data may be fed back and stored in an accumulation buffer without wavelet synthesis.
Then, difference data to be transmitted in the next frame is obtained by comparing the incoming frame and the stored frame, which are both in wavelet representation.
In another embodiment, data quantization may be carried out using a number of bit allocation planes for each of a number of Mallat blocks to be transmitted and/or retained for storage, so as to meet transmission bandwidth limitations and/or data storage space limitations in a data compression scheme.
The number of bit planes allocated to a given Mallat block is determined in accordance with required accuracy or resolution for a frequency range represented by that block
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Image Analysis 
