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Method and device of vedio noise reduction

A video noise reduction and video signal technology, applied in the field of noise reduction, can solve the problem of poor noise reduction effect and achieve the effect of avoiding tailing

Inactive Publication Date: 2009-04-15
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The embodiment of the present invention provides a method and device for video noise reduction, which can solve the problem of poor noise reduction effect in the prior art

Method used

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  • Method and device of vedio noise reduction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 2 As shown, this embodiment describes a video noise reduction processing method when video signals are received interlaced.

[0036] Step 21. Receive a video signal and perform low-pass filtering on the video signal. The method of receiving the video signal is interlaced reception.

[0037] Step 22. Obtain the absolute difference in the horizontal direction according to the method of receiving video signals interlaced.

[0038] The methods for obtaining the absolute difference in the horizontal direction specifically include:

[0039] Obtain the absolute difference between the current point and the point before the current point in the current field;

[0040] In the previous field, the absolute difference between the corresponding point of the current column of the previous line of the current line and the horizontal adjacent point of the corresponding point is obtained; for the convenience of description, in this application document, the previous lin...

Embodiment 2

[0070] Such as Figure 4 As shown, this embodiment describes a video noise reduction processing method when video signals are received line by line.

[0071] Step 41. Receive a video signal, and perform low-pass filtering on the video signal. The method of receiving the video signal is progressive reception.

[0072] Step 42. Obtain the absolute difference in the horizontal direction according to the method of receiving the video signal line by line.

[0073] The method of obtaining the absolute difference in the horizontal direction is as follows:

[0074] Obtain the absolute difference between the current point and the point before the current point in the current field;

[0075] Obtain the absolute difference between the corresponding point of the current row and the current column and the horizontal adjacent point of the corresponding point in the previous field;

[0076] A maximum absolute difference is determined from the above absolute differences, and the determined...

Embodiment 3

[0090] Such as Figure 5 As shown, the embodiment of the present invention also discloses a video noise reduction device. The video noise reduction device includes: a video signal receiving unit (not shown), a field storage unit 1, a low-pass operation unit 2, a boundary determination unit 3, A noise figure evaluation unit 4 and an iterative operation unit 5 . For the convenience of description, the video noise reduction device according to the embodiment of the present invention will be described below by taking interlaced video data reception as an example.

[0091] The video signal receiving unit is used for receiving video signals.

[0092] The field storage unit 1 is used to store the luminance data of the previous field and the previous two fields. When other units (boundary determination unit 3, noise figure evaluation unit 4 and iterative operation unit 5) send requests to the field storage unit 1, they can obtain The data of the previous row and the next row of the ...

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Abstract

This invention provides a method and device for video noise reduction including: receiving video signals and carrying out low pass filtration to the signals, determining if the current points of the signals are flat region or static region points, when they the flat ones, the values of the current points are the result of low pass filtration, when they are static region points, they are processed evenly in multiple images. This invention also discloses a video noise-reduction device including a field storage unit, a low pass operation unit, an edge determining unit, a noise system evaluation unit and an iteration operation unit.

Description

technical field [0001] The invention relates to a noise reduction technology, in particular to a video noise reduction method and device. Background technique [0002] In the process of video signal transmission, white noise is introduced, and the frequency of the white noise is distributed on the whole frequency spectrum, and the energy is very small. White noise appears as flickering "noise" in the picture, so white noise will reduce the display effect of the picture. Screen display effect is an important factor that consumers consider when purchasing products. Therefore, providing the function of reducing noise in the image to improve image display effect is one of the issues that every display manufacturer must consider when producing display screens. [0003] There are many causes of white noise, so it is difficult to eliminate it from the source. Existing methods for eliminating white noise include low-pass filtering and multi-image averaging. The following briefly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/21H04N5/46
Inventor 黄喆
Owner HUAWEI TECH CO LTD