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Apparatus for removing noise of video signal

A technology of video signal, noise, applied in the field of broadcast receiver

Inactive Publication Date: 2006-08-02
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Thus, the present invention is directed to an apparatus for denoising a video signal, substantially overcoming one or more of the problems due to the limitations and disadvantages of the prior art

Method used

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  • Apparatus for removing noise of video signal
  • Apparatus for removing noise of video signal
  • Apparatus for removing noise of video signal

Examples

Experimental program
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Effect test

no. 1 example

[0043] FIG. 1 is a block diagram of an apparatus for removing noise from a video signal according to a first embodiment of the present invention.

[0044] With reference to Fig. 1, the device for removing video signal noise according to the first embodiment of the present invention includes: video signal delay unit 110, time noise level estimation unit 120, Kalman (Kalman) filter unit 130, and time filter unit 140 .

[0045]In the device with the above structure, the currently input video is sent to the video signal storage unit 110 , temporal noise level estimation unit 120 and temporal filtering unit 140 .

[0046] The video signal storage unit 110 delays the input video in frame units, and then outputs the delayed signal to the temporal noise level estimation unit 120 and the temporal filter unit 140 .

[0047] The temporal noise level estimation unit 120 includes: an operation unit 121 that finds the absolute value of the frame difference between the luminance values ​​of...

no. 2 example

[0101] FIG. 4 is a block diagram of an apparatus for removing noise from a video signal according to a second embodiment of the present invention.

[0102] Referring to FIG. 4 , the device for removing noise from a video signal according to the second embodiment of the present invention includes: a video signal storage unit 410 , a temporal noise level estimation unit 420 , a Kalman filter unit 430 and a temporal filter unit 440 .

[0103] The second embodiment of the present invention differs from the first embodiment of the present invention in the estimation process of the temporal noise level estimation unit 420 .

[0104] The temporal noise level estimating unit 420 receives the difference between two temporally continuous video signals, and calculates the variance of the noise by which, in the noise generated from the video motion between the two timing points, the The noise component is removed, and then the calculated variance is output.

[0105] That is, the video si...

no. 3 example

[0148] FIG. 5 is a block diagram of an apparatus for removing noise from a video signal according to a third embodiment of the present invention.

[0149] With reference to Fig. 5, the device for removing video signal noise according to the third embodiment of the present invention includes: video signal storage unit 510, spatial noise level estimation unit 520, temporal noise level estimation unit 530, global motion detection unit 540, Kalman filtering unit 550 and temporal filtering unit 560 .

[0150] The currently input video is supplied to the video signal storage unit 510 , the spatial noise level estimation unit 520 , the temporal noise level estimation unit 530 and the temporal filtering unit 560 .

[0151] The video signal storage unit 510 delays the input video in frame units, and then outputs the delayed signal to the spatial noise level estimating unit 520 , the temporal noise level estimating unit 530 , and the temporal filtering unit 560 .

[0152] The temporal ...

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Abstract

An apparatus for removing a noise of a video signal is disclosed, by which a noise level can be effectively estimated to enhance an image quality of the video signal, by which the noise can be removed in a manner of effectively estimating a noise level though motion adaptive filtering, and by which blurring is prevented in the process of removing the noises. The present invention includes a temporal noise level estimation unit estimating a level of a temporal noise included in the video signal using a difference between two temporally consecutive videos, a noise correction unit correcting a noise estimated by the temporal noise level estimation unit, and a noise removal unit removing the noise included in the video signal using a level of the corrected noise.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2005-0004498, filed January 18, 2005, and Korean Patent Application No. 10-2005-0091446, filed September 29, 200, hereby Combined references are made in their entirety. technical field [0002] The present invention relates to broadcast receivers, and more particularly to devices for removing noise from video signals. Although the invention is suitable for a wide range of applications, it is particularly suitable for noise reduction of video signals. Background technique [0003] Usually, in the TV video signal, there are always various noises, such as thermal noise of the camera, noise in the process of transmission and so on. Moreover, these noises are a major factor in the degradation of image quality. [0004] Therefore, the TV receiving unit or the like performs processing such as noise removal. In doing so, if the level of noise added to the video is unknown, the processing cannot provide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/21H04N5/213H04N5/217
CPCH04N5/21H04N23/81
Inventor 李广渊
Owner LG ELECTRONICS INC
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