Method for eliminating blocking effect in compressed video signal
a video signal and blocking effect technology, applied in the field of eliminating blocking effects in compressed video signals, can solve the problems of video being visually unclear, increasing information loss, and affecting the quality of compressed video signals, so as to reduce prediction residuals, reduce compression efficiency, and reduce the effect of redundant smoothing of compressed video signals
Inactive Publication Date: 2017-05-09
LG ELECTRONICS INC
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Benefits of technology
This approach reduces prediction residual and eliminates blocking effects, enhancing compression efficiency and video quality by preventing excessive smoothing, allowing for real-time high-speed processing and improved video restoration.
Problems solved by technology
However, in case of compressing a moving picture using the hybrid motion compensation discrete cosine transform technique, a blocking effect and ring effect occur in the video signal reconstructed at an video decoding unit due to the loss of information generated in the quantization process.
However, because the loss of information is increased, a phenomenon that an video is visually unclear is occurred.
However, this method is inefficient because the loop filter is used only for an intra frame, the video signal restored after post-filtering is redundantly smoothed, and a prediction residual between the video signal of which the motion is compensated by the loop filter and the original video signal is increased.
However, the low pass filtering method has a problem that the quality of the restored video signal is redundantly smoothed according to the type and compression factor of the video signal, since the value of a filter tap or filter coefficient for eliminating a blocking effect is set according to an experimental value.
In the normalization restoration method, there is difficulty processing in real time, because calculation is performed on each video signal, and the equation for the calculation has a matrix form, thus requiring a large computational complexity.
In addition, when calculated normalized coefficients determine the degree of smoothness, the average value is applied irrespective of the degree of non-uniformity, thereby reducing adaptability.
Method used
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[0033]The preferred embodiment of the present invention will now be described with reference to the accompanying drawings.
[0034]FIG. 2 is a block diagram illustrating a configuration in which a compressed video signal is restored according to the present invention. When a compressed video signal is transmitted from the outside, the transmitted signal is inputted to a decoding unit 300, the decoding unit 300 decoding the inputted video signal, thus outputting Y, U, and V video, a quantized variable, and a macroblock type. The outputted signal is inputted to a blocking elimination filter 400 to output an video from which a blocking effect and a ring effect remaining in the signal are removed.
[0035]The operation of the components of the present invention will be described in detail with reference to FIGS. 2 and 3 by taking H.26L algorithm by example.
[0036]First, a loop filter of an video decoding unit according to the conventional art reduces the prediction residual between a motion co...
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The present invention relates to a method for eliminating a blocking effect in a compressed video signal signal. The method of the invention includes: the encoding step of eliminating a blocking effect by compensating the motion of a signal compressed in block unit to be transmitted; the decoding step of restoring the motion compensated video signal to the original video signal by reducing the prediction residual between the motion compensated video signal and the original video signal and the blocking effect; and the post-filtering step of performing post-filtering in a blocking elimination filter in order to eliminate a blocking effect and ring effect remained in the compensated signal. The equation for obtaining the original pixel is made simple by eliminating the remaining blocking effect and ring effect using a loop / post filter. In addition, normalization parameters can be stored in the look-up table and can be detected according to the difference between pixels adjacent to the original pixel and the size of quantizaiton, whereby the equation for restoring the compressed moving video signal, resulting in excessive smoothing, becomes simpler, and filtering control is made possible by a simple equation, thus making a high speed real time video signal processing possible.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]More than one reissue application has been filed for the reissue ofThis application is a Reissue Application of U.S. Reissue Pat. No. Re. 43,709, reissued on Oct. 2, 2012, which is a reissue of U.S. Pat. No. 6,859,558, including reissue application Ser Nos. 11 / 709,212 (the present application), and 12 / 333,501, now abandoned, which is a divisional reissues of reissue application Ser. No. 11 / 709,212. The present application is a reissue application of U.S. patent application Ser. No. 09 / 730,745, filed Dec. 7, 2000, now U.S. Pat. No. 6,859,558,issued Feb. 22, 2005, which claims priority from Korean Application No. 1999-55678, filed on Dec. 8, 1999, each of which is hereby incorporated by reference as if fully set forth herein.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a method for eliminating a blocking effect in a compressed video signal, and more particularly, to a method for eliminatin...
Claims
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IPC IPC(8): G06K9/36H04N19/86G06K9/46H04N19/80H04N7/24G06T9/00H04N7/26
CPCH04N19/80H04N19/86
InventorHONG, MIN-CHEOL
OwnerLG ELECTRONICS INC