8x8 transform and quantization

A technology of inverse quantization and quantization step size, which is applied in the fields of instrumentation, computing, and electrical digital data processing, and can solve problems such as high computational complexity.

Inactive Publication Date: 2006-11-01
TEXAS INSTR INC
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  • Abstract
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Problems solved by technology

[0162] However, even the 32-bit AVS method has high computational complexity

Method used

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  • 8x8 transform and quantization

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Embodiment Construction

[0168] 1 Overview

[0169] The preferred embodiment low-complexity method provides both an 8×8 block transform / inverse transform and quantization / inverse quantization; the quantization has a range of quantization steps and the inverse quantization uses a shift. The quantization / inverse quantization provides high performance with low complexity 16-bit arithmetic operations and small table size. The method is suitable for video compression, which operates on 8x8 pixel blocks (motion compensated) by DCT transform and quantization of DCT coefficients and where the quantization can vary widely. As shown in Figure 2, full-scale feedback from the bitstream buffer can determine a quantization factor that typically ranges from 1 to 200-500.

[0170] The preferred embodiment system uses a digital signal processor (DSP) or a general-purpose programmable processor or an application-specific circuit or a system-on-a-chip (SOC) (for example, both the DSP and the RISC processor are on the ...

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Abstract

Low complexity video compression has 8x8 block with transforms using 8x8 integer matrices and quantization with look up table scalar plus constant right shift for all quantization steps. Inverse quantization also a look up table scalar plus right shift dependent upon the quantization step and inverse transform using the 8x8 integer matrices.

Description

[0001] Related Application Cross Reference [0002] This application claims priority to Provisional Application Serial No. 60 / 505,575, filed September 24,2003. Related subject matter is disclosed in the following commonly assigned pending patent application: Provisional Application No. 60 / 524,831 filed November 25,2003. technical field [0003] The present invention relates to digital image and video signal processing, and more particularly to block transform and / or quantization plus inverse quantization and / or inverse transform. Background technique [0004] Various applications exist for digital video communication and storage, and corresponding international standards have been developed and continue to be developed. Low bit rate communications such as video telephony and conferencing coupled with the compression of large video files such as movies has led to various video compression standards: H.261, H.263, MPEG-1, MPEG-2, AVS, etc. These compression methods rely on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/12H04N
CPCG06F17/147H04N19/42H04N19/61H04N19/124H04N19/60
Inventor 周民华
Owner TEXAS INSTR INC
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