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Method for reducing bit rate requirements for encoding multimedia data

A technology for encoding bit rate and multimedia data, which is applied in the field of compressed data systems, and can solve problems such as ineffective utilization

Active Publication Date: 2009-06-10
HONG KONG APPLIED SCI & TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, known compression algorithms may not be able to effectively exploit the redundancy present in multimedia data

Method used

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  • Method for reducing bit rate requirements for encoding multimedia data
  • Method for reducing bit rate requirements for encoding multimedia data
  • Method for reducing bit rate requirements for encoding multimedia data

Examples

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Embodiment Construction

[0011] In order to illustrate the compression of video frames according to an exemplary embodiment of the present invention, please refer to figure 1 . figure 1 The processing flow starts from step 101. In step 101, a set of non-overlapping pixel macroblocks is defined. A macroblock may be subdivided into sub-macroblocks of size 16x16, 16x8, 8x16, 8x8, 4x8, 4x4 and / or equal in size as disclosed for motion estimation of multiple block sizes. Different modes of sub-macroblock partitioning can be applied to each macroblock. Again, this subdivision can vary from frame to frame. Each macroblock may include more than one component or channel (eg, RGB, YIQ, YUV, YCbCr, etc.).

[0012] In step 102, for each block in the current frame, the best matching block is obtained. Each best matching block can be determined from blocks of the same size in the reference frame. Alternatively, the best matching block can be generated from larger blocks in a similar manner to overlapping motio...

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Abstract

Some representative embodiments are directed to systems and methods for compressing a data set. In one embodiment, a method comprises receiving a frame of data to be encoded, generating a residual frame that represents a difference between the received frame and one or several reference frames, performing a respective sum of absolute differences (SAD) calculation for each block within the residual frame, and applying a transform function to each data value within the residual frame, wherein the transform function is at least a function of a SAD value calculated for the block containing the respective data value.

Description

technical field [0001] The present invention generally relates to systems and methods for compressing data. Background technique [0002] Multimedia data (video, audio, text and combinations thereof) used in various applications has a large degree of complexity. In many applications, this complexity is primarily overcome through data compression for efficient processing, transfer, presentation and other important functions involving multimedia data. [0003] Data compression algorithms depend on the redundancy of data sets in order to obtain coding efficiency. Typically, data compression is achieved using a priori knowledge of the characteristics of a data set to select an encoding algorithm for that data set. For example, image compression algorithms depend on the spatial correlation of image data. Specifically, we know that the level of each pixel is closely related to the level of adjacent pixels. Similarly, the level of a pixel in each video frame is closely related ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/32
CPCH04N19/00151H04N19/00084H04N7/26101H04N19/00157H04N7/26127H04B1/66H04N7/26138H04N19/122H04N19/139H04N19/14
Inventor 火焰区子廉雷志斌
Owner HONG KONG APPLIED SCI & TECH RES INST
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