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Deinterlacing method based on movement detection

A motion detection and de-interlacing technology, applied in the direction of standard conversion, etc., can solve the problems of large noise influence, affecting de-interlacing effect, and inability to use time domain information, so as to simplify calculation, avoid adverse effects, and avoid inaccurate information between frames Effect

Inactive Publication Date: 2011-04-20
SICHUAN PANOVASIC TECH
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AI Technical Summary

Problems solved by technology

The motion adaptive algorithm can eliminate motion aliasing and improve the vertical definition of the image, but it needs point-by-point motion detection, which is greatly affected by noise, and interpolation in the motion state cannot use time domain information, and weighting will also cause inaccurate interpolation results, which will affect image quality. interlaced effect
[0005] The motion compensation algorithm calculates the motion displacement vector by performing motion estimation on the image (such as block matching, optical flow method, etc.), and performs interpolation on the motion trajectory. The image restored by this method can well maintain the vertical clarity of the image degree, but he requires that the estimated motion vector must be accurate and reliable, resulting in a large amount of calculation, large consumption of hardware resources, and high complexity of hardware implementation

Method used

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Embodiment Construction

[0031] 1. Find the maximum correlation in the frame, assuming that the selection range is j±2, use the points on the left and right of the correlation point to denoise, and each direction corresponds to the sum of the absolute differences of the pixel values ​​in the field:

[0032] I0=|P(i-1, j)-P(i+1, j)|+|P(i+1, j-1)-P(i-1, j-1)|+|P(i -1,j+1)-P(i+1,j+1)|;

[0033] I1=|P(i-1, j-1)-P(i+1, j+1)|+|P(i-1, j-2)-P(i+1, j)|+|P (i-1,j)-P(i+1,j+2)|;

[0034] I2=|P(i-1, j-2)-P(i+1, j+2)|+|P(i-1, j-3)-P(i+1, j+1)|+ |P(i-1, j-1)-P(i+1, j+3)|;

[0035]The sum of absolute differences of pixel values ​​in the field corresponding to the maximum directional correlation=min(I1, I2, I0);

[0036] If min(I1, I2, I0)=I0, then the two points with the largest intra-field directional correlation are Xup and Xdown:

[0037] Xup=P(i-1,j);

[0038] Xdown=P(i+1,j);

[0039] The mean value X of the pixel values ​​of two points adjacent to the point to be interpolated on the corresponding directio...

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Abstract

The invention relates to a time-space domain multi-field related de-interlacing technology, which is convenient to realize by hardware. The invention provides a de-interlacing method with time-space domain information based on a movement adaptive algorithm. Different from moving state directed by an ordinary movement adaptive algorithm, that is field-in interpolation, the invention still searchesfor related points in a small scale of adjacent fields when it judges that it is in the moving state. It further determines specific interpolation method of next step by comparison with a predetermined value. The predetermined value ensures inter-field direction correlation of current field enough, which makes inter-field pixel points with large direction correlation participate interpolation calculation. It consumes less hardware resources compared with various search algorithms of movement compensation and is added with time domain information compared with movement adaptation, which makes the interpolation result in movement condition have time continuity. It uses peripheral point information to calculate, which overcomes effect of noise to mono-point operation and improves movement interpolation accuracy.

Description

technical field [0001] The invention belongs to the technical field of digital image processing and video display, and in particular relates to a time-space domain multi-field correlation deinterlacing method which is convenient for hardware realization. technical background [0002] Video image de-interlacing technology is one of the indispensable important technologies of image processing in the field of TV application at the present stage. [0003] The most commonly used broadcast television systems include NTSC 525-line 60Hz field frequency system (mainly used in North America and Japan) and 625-line 50Hz field frequency PAL system (mainly used in Europe and China). Flicker and line creep and other shortcomings, so it is inevitable to perform interlaced to progressive conversion, that is, de-interlacing technology. The essence of the de-interlacing algorithm is to restore the odd (even) lines of the actual thing by interpolating the existing interlaced signal. Restores...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/01
Inventor 徐慧博刘强
Owner SICHUAN PANOVASIC TECH
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