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Method and apparatus for lapped transform coding and decoding

A technique of lapped transform and inverse overlap, applied in the field of lapped transform coding, which can solve problems such as high overhead and lack of adaptation

Inactive Publication Date: 2008-06-11
NTT DOCOMO INC
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  • Abstract
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Problems solved by technology

This transform design lacks the adaptiveness required in its underlying functional structure (fixed or variable length) to capture and use statistical variation in the image data to which it is applied.
Furthermore, if local adaptive provision occurs, the resulting overhead is significant, which negatively impacts the overall performance of the process
Adapting the inverse lapped transform based only on the properties of the reconstructed data available at the decoder is another limiting factor

Method used

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  • Method and apparatus for lapped transform coding and decoding
  • Method and apparatus for lapped transform coding and decoding
  • Method and apparatus for lapped transform coding and decoding

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Embodiment Construction

[0025] A method, apparatus, and article of manufacture for deriving and using a nonlinear adjusted lapped transform (NALT). In one embodiment, the determination of the NALT is based on the adaptation of the basis functions of the transform in the encoder to the local statistics of the image and the estimation of the parameters of the inverse lapped transform at the decoder, while maintaining the low association overhead. In one embodiment, the lapped transform is adapted to local block statistics in the image leading to improved rate-distortion coding performance, and is structured to reduce (as much as possible minimize) the associated overhead information transmitted from the encoder to the decoder . In one embodiment, adaptation is done for forward and inverse lapped transforms.

[0026] In the following description, various details are set forth in order to provide a more detailed explanation of the present invention. It will be apparent, however, to one skilled in the ...

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Abstract

A method, apparatus, and article of manufacture for deriving and using non-linearly adapted lapped transforms (NALTs) In one embodiment, the method comprises receiving parameters of a statistical fit between local statistics of original and processed frame data, determining adaptation parameters for application of an inverse lapped transform to frame data, and filtering the frame data in response to filtering adaptation parameters.

Description

[0001] This patent application claims priority benefit to a corresponding Provisional Patent Application Serial No. 60 / 691,758, entitled "Method And Apparatus For Lapped Transform Coding and Decoding," filed June 17, 2005, which is incorporated by reference. technical field [0002] The present invention relates to the field of overlapping transform coding, and more particularly, the present invention relates to adaptive overlapping transform coding with reduced overhead. Background technique [0003] One of the elements of data transform coding is represented by the application of data transforms. Using block transforms to independently process data blocks in an image limits coding performance and can produce undesired blocking artifacts visible in reconstructed images. To reduce these artifacts, a certain amount of overlap in blocks can be taken into account during transform coding, thus leading to the use of lapped transforms for image or video coding and decoding. The d...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/30H04N19/117H04N19/157H04N19/176H04N19/196H04N19/463H04N19/61H04N19/82H04N19/86
Inventor 丹·莱列斯库
Owner NTT DOCOMO INC
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