A digital image noise reduction method and device

A digital image and noise reduction technology, which is applied in the field of digital TV image noise reduction, can solve the problems of missed judgment and moving image misjudgment, and achieves the effect of reducing misjudgment and missed judgment, and improving the visual effect.

Inactive Publication Date: 2008-02-13
POWERLAYER MICROSYST HLDG
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Problems solved by technology

However, the existing inter-frame noise reduction methods still have the problem of misjudgment and missed judgment of moving images.

Method used

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  • A digital image noise reduction method and device
  • A digital image noise reduction method and device
  • A digital image noise reduction method and device

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Embodiment Construction

[0024] The present invention will be further described below with reference to the accompanying drawings and in conjunction with the embodiments.

[0025] As shown in Figure 1, the basic principle of the noise reduction method of the present invention is, at first noise analysis is carried out to the input image, calculates the difference frame / field image between input image frames or between two fields separated by one field; Frame / field noise analysis, giving control information such as frame / field noise flag, noise type and field noise power, used to adaptively select frame / intra-field or / and frame / field inter-noise reduction; finally output after noise reduction Image.

[0026] Fig. 2 is a flowchart of the noise reduction step in the method of the present invention. The noise reduction process is as follows:

[0027] 1) Start the system work;

[0028] 2) Input a frame / field image by progressive scanning or interlaced scanning;

[0029] 3) Perform noise analysis (1) to...

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Abstract

The invention discloses a digital image noise reduction method and device. The noise reduction method includes: performing noise analysis on an input image, calculating the difference frame/field image between input image frames or between two fields separated by one field, and based on the difference frame Image analysis of the frame/field noise statistical characteristics; perform noise analysis, calculate noise power, determine noise signs and determine noise classification; adaptively select frame/intra-field noise reduction or/and frame/inter-field noise reduction methods. The device for digital image noise reduction includes: frame memory, noise analysis unit and frame/field noise reduction unit. Since the present invention selects and adopts frame/intra-field and/or frame/inter-field noise reduction methods by analyzing the noise characteristics of difference frame/field images, and selects appropriate weights according to the characteristics of noise and image information, the noise reduction Finally, images with better visual effects are obtained.

Description

technical field [0001] The invention relates to image processing technology, in particular to a method and device for digital television image noise reduction. Background technique [0002] In the process of image acquisition, transmission and storage, it is always unavoidable to be interfered by various noise sources. When the interference comes from outside the system, such as external noise caused by external electromagnetic waves entering the system through the power supply; there are also internal interferences from the system, such as internal noise such as thermal noise of the camera or jitter noise generated by mechanical movement of electrical appliances. Typical noises in images are white noise and impulse noise, and noise reduction is crucial to improving the quality of TV pictures. [0003] In the prior art, noise reduction can be done in the image transform domain or the spatial domain. The method of denoising in the image transform domain is: first perform so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/21
Inventor 闫建新邓宇董旭柳崎峰
Owner POWERLAYER MICROSYST HLDG
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