Unlock instant, AI-driven research and patent intelligence for your innovation.

Quantization matrix adjusting method avoiding data quantity shortage

A technology of input buffer and quantization matrix, which is applied to components of color TV, components of TV system, and transmission of pulse-modulated TV signals, etc., can solve problems such as image quality reduction, reduce quantization scale factor and improve image quality. Effect

Inactive Publication Date: 2006-08-23
SILICON INTEGRATED SYSTEMS
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can avoid insufficient VBV capacity, it seriously reduces the image quality

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Quantization matrix adjusting method avoiding data quantity shortage
  • Quantization matrix adjusting method avoiding data quantity shortage
  • Quantization matrix adjusting method avoiding data quantity shortage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0052] The following describes in detail the quantization matrix adjustment method of the present invention to avoid insufficient input buffer capacity of the decoder with reference to the accompanying drawings.

[0053] The lack of VBV data occurs when the current image is encoded with the default quantization matrix W[v][u] and the largest quantization scale factor Q. Since the quantization scale factor Q is specified from 1 to 31 and cannot be changed, the present invention enlarges the preset quantization matrix W[v][u] to reduce the quantized DCT coefficient QF[v][u] (reference formula (1)).

[0054] In the MPEG-1 and MPEG-2 specifications, a sequence header data must be configured at the beginning of each coded bit stream, and the header can be added to the subsequent bit stream. Once the decoder receives the header data, the quantization matrix W[v][u] will be set to the default value. In MPEG-1, the customized quantization matrix W[v][u] can only be set in the header, and ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention is a quantification matrix adjusting method for avoiding deficiency of data, which includes: updates used bit unit value and even quantification ratio factor; designates estimated value to current image; calculates estimation quantification ratio factor; according to the bit unit value, even quantification ratio factor and estimation quantification ratio factor, it judges if enters the emergency mode, when one estimation quantification ratio factor is bigger than a threshold of one quantification ratio factor, it sets a emergency mode, otherwise it maintains the normal mode, the preset quantification matrix is amplified; and coding, when the coder enters emergency mode, it carries on code according to the quantification matrix. The invention amplifies the preset quantification matrix when in emergency, reduces the quantification ratio factor effectively, and avoids the deficiency of data in video buffer, and the image quality after being coded can be upgraded.

Description

Technical field [0001] The invention relates to a quantization matrix adjustment method for avoiding insufficient capacity of the input buffer of a decoder. Background technique [0002] In order to reduce the video capacity, the video is generally compressed, such as video coding in MPEG format. The basic unit of video coding is a macro-block. If the sampling is in the 4:2:0 format, each macroblock has 6 blocks, which are 4 Y blocks, 1 Cb block, and 1 Cr block. Each block must first undergo a discrete cosine transform (DCT), and then quantize the DCT coefficients into integers. A zigzag scan or other alternative scan method is used to arrange a two-dimension array of quantized coefficients into one-dimension data. Finally, the so-called variable-length coding (VLC) is used for entropy coding. [0003] Generally, the quantization of DCT coefficient F[v][u] can be expressed as: [0004] QF[v][u]=16*F[v][u] / (Q*W[v][u]) ... (1) [0005] Among them, v and u are the indexes of the two...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/24H04N7/26H04N5/917H04N19/124
Inventor 张永清
Owner SILICON INTEGRATED SYSTEMS
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com