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Dynamic noise filtering device and Sigma filtering method

A filtering device and dynamic noise technology, applied in the field of noise filtering, can solve problems such as unstable image output quality

Inactive Publication Date: 2010-08-04
SILICON INTEGRATED SYSTEMS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As can be seen from the above example, because Figure 5B In the relationship between slope2=∞, when the pixel value of the block has a little noise, it may cause the target pixel output of the sigma filter to produce six grayscale changes, resulting in unstable image output quality

Method used

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  • Dynamic noise filtering device and Sigma filtering method
  • Dynamic noise filtering device and Sigma filtering method
  • Dynamic noise filtering device and Sigma filtering method

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Embodiment Construction

[0063] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention. In order to make the above and other objects, features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

[0064] The dynamic noise filtering device of the present invention can utilize one of hardware, software, firmware (firmware), or any combination of the first three to implement, for example: the example of pure hardware implementation is a field programmable logic gate array (field programmable logic gate array) gate array (FPGA) design, or an application specific integrated circuit (ASIC) design, and an example of a combination of hardware and firmware is a digital signal processor (DSP) and its built-in components. combination.

[0065] Figure 6A It is a schematic structural diagram of an embodiment of...

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Abstract

The invention provides a dynamic noise filtering device and a Sigma filtering method, wherein the dynamic noise filtering device comprises a noise estimating circuit, a TNR (Time-domain Noise Rejection) filter, an SNP (Space-domain Noise Rejection) filter, a mixing circuit and a mobile estimating circuit. In the invention, by carrying out noise estimation on each image to reach the best image quality, the strength of the SNR filter and the TNR filter is dynamically regulated and the mixing ratio of the output of the SNR filter and the input of the TNR filter is also dynamically regulated, thereby achieving optimal image quality.

Description

technical field [0001] The present invention relates to noise filtering, in particular to a noise filter device (noise filter) with a dynamic adjustment function and a sigma filtering method. Background technique [0002] Figure 1A is a characteristic curve of a known temporal noise reduction (temporal noise reduction, TNR) filter. Figure 1B Displays a graph of the relationship between successive fields on the time axis. [0003] Averaging possible correlated (correlated) pixel groups is a common way to achieve image noise suppression (noisereduction), refer to Figure 1A and Figure 1B For example, the TNR filter is to compare the pixel (cur , i, j)) and the luminance value of the same coordinate pixel pixel (pre2, i, j) in the previous two image fields (hereinafter referred to as pre2 image field), if the absolute difference between the luminance of the pixel If the value (diff=abs(pixel(cur, i, j)-pixel(pre2, i, j))) is less than th1, the pixel will be regarded as st...

Claims

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Application Information

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IPC IPC(8): H04N5/21
Inventor 徐正运
Owner SILICON INTEGRATED SYSTEMS
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