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A Transform-Domain Coefficient Quantization Method Symmetrical with Values ​​in the Value Domain

A quantization method and transform domain technology, applied in the field of digital video recorders, can solve the problems of loss of quantization errors, large signals, etc., and achieve the effects of overcoming quantization errors, reducing hardware implementation, and reducing a large number of computing operations

Active Publication Date: 2018-07-17
厦门趣店科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, since the transform domain energy is not symmetrical about zero, this quantization method is likely to cause a large signal loss (quantization error)

Method used

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  • A Transform-Domain Coefficient Quantization Method Symmetrical with Values ​​in the Value Domain
  • A Transform-Domain Coefficient Quantization Method Symmetrical with Values ​​in the Value Domain
  • A Transform-Domain Coefficient Quantization Method Symmetrical with Values ​​in the Value Domain

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Embodiment Construction

[0024] An implementation of a transform domain coefficient quantization method symmetrical with the median value of the range, such as image 3 As shown, it includes a range endpoint and midpoint calculation module 1, a quantization interval length calculation module 2, and a quantization index calculation module 3. The value range endpoint and midpoint calculation module 1 calculates the value range endpoint value x after receiving the input data min and x max and the median value of the value range; the quantization interval length calculation module 2 receives the calculation results from the value range endpoint and the midpoint calculation module 1 and the input quantization level value, and thus calculates the left and right quantization interval length values; the quantization index calculation module 3 Calculate and output the quantization index according to the calculation result of the quantization interval length calculation module 2 and the input data.

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Abstract

The invention discloses a transform domain coefficient quantifying method with quantizing intervals symmetric about a value domain in a mid-value mode. The method includes a quantizing interval length calculating method and a quantizing index calculating method. According to the quantifying method, a transform domain coefficient is an unsigned number, hardware implementation is facilitated, and the calculation amount and power consumption are lowered.

Description

technical field [0001] The invention relates to a digital video recorder. Background technique [0002] Usually, digital video recorders have a link for data compression processing of video images, which is composed of video image time domain data → frequency domain data conversion, frequency domain (transform domain) coefficient quantization and encoding and other processing processes. Among them, the quantization process is a key step in determining data trade-offs to determine the data compression factor. [0003] It is generally believed that the transformation from the time domain to the frequency domain is conducive to concentrating energy in certain areas, so the transformation domain can be divided into several sub-intervals, and the partial value of the transformation domain (value domain) can be used to approximately replace the full range value. This is the basic principle of quantification. [0004] It can be seen that the division of the above sub-intervals (q...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/124H04N19/64
Inventor 张春兰
Owner 厦门趣店科技有限公司