KR0147549B1 - The compensation method of image blocking phenomenon - Google Patents
The compensation method of image blocking phenomenonInfo
- Publication number
- KR0147549B1 KR0147549B1 KR1019920003262A KR920003262A KR0147549B1 KR 0147549 B1 KR0147549 B1 KR 0147549B1 KR 1019920003262 A KR1019920003262 A KR 1019920003262A KR 920003262 A KR920003262 A KR 920003262A KR 0147549 B1 KR0147549 B1 KR 0147549B1
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- South Korea
- Prior art keywords
- image data
- block
- boundary
- image
- pixel value
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Compression Of Band Width Or Redundancy In Fax (AREA)
Abstract
DCT를 사용한 영상부호와 방식에서 블럭간 경계부분에 불연속적인 경계가 발생하는 블럭화 현상을 보정하는 방법에 관한 것으로서, 2차원 영상 데이타를 블럭분할하여 압축 부호화된 디지탈 영상 데이타를 수신하고 수신된 상기 디지탈 영상 데이타를 신장 복호화해서 원영상 데이타를 재현하는 디지탈 영상 수신 장치의 영상블럭화 현상 보상 방법에 있어서, 상기 신장 복호화된 영상데이타의 각 블럭의 경계부분을 평활 처리하는 것을 특징으로 한다.The present invention relates to a method of correcting a block phenomenon in which a discontinuous boundary occurs at a boundary between blocks in a video code and a method using a DCT. The present invention relates to a block division of two-dimensional image data to receive compressed coded digital image data, and to receive the received digital image data. An image blocking phenomenon compensation method of a digital image receiving apparatus which decodes and decodes image data to reproduce original image data, wherein the boundary portion of each block of the decoded image data is smoothed.
따라서 본 발명에서는 블럭분활되어 압축부호화된 영상데이타를 신장복호화함에 있어서 복원된 영상데이타의 각 블럭간 경계화소값들을 평활처리 함으로써 블럭화현상을 보상할 수 있으므로 화질을 개선시킬 수 있다.Accordingly, in the present invention, in decompression and decoding of block-segmented and compressed-coded image data, the block image phenomenon can be compensated by smoothing the boundary pixel values between blocks of the reconstructed image data, thereby improving image quality.
Description
제1도는 본 발명에 의한 디지탈 영사처리 장치의 블럭도.1 is a block diagram of a digital projection processing apparatus according to the present invention.
제2도는 본 발명에 의한 SFM(Smoothing Filter Mask)의 일실시예를 나타낸 도면.2 is a diagram illustrating an embodiment of a smoothing filter mask (SFM) according to the present invention.
제3도는 블럭간 경계화소를 나타낸 도면.3 shows inter-block boundary pixels.
본 발명은 영상블럭화 현상 보정방법에 관한 것으로, 특히 DCT를 사용한 영상부호화 방식에서 블러간 경계부분에 불연속적인 경계가 발생하는 블럭화 현상을 보정하는 방법에 관한 것이다.The present invention relates to a method of correcting an image blocking phenomenon, and more particularly, to a method of correcting a blocking phenomenon in which discrete boundaries are generated at boundaries between blurs in an image encoding method using DCT.
최근 디지탈 영상 데이타 압축에 있어서 DCT(Discrete Cosine Transform)를 사용한 영상부호화 방식에서는 영상전체를 한번에 변환하지 않고 영상을 8×8 또는 16×16 화소사이즈의 블럭으로 나누어 처리하고 있다.Recently, in video image compression using DCT (Discrete Cosine Transform) in digital image data compression, the image is divided into 8 × 8 or 16 × 16 pixel blocks without processing the whole image at once.
따라서, 고압축율로 영상을 부호화할 경우, 블럭간의 경계부분에 불연속적인 경계가 발생하는 블럭화현상이 발생한다. 이와 같은 블럭화현상은 각 블럭의 밝기를 결정하는 DCT계수와 저주파성분의 양자화 오차에 의해 영향을 많이 받는다.Therefore, when the image is encoded at a high compression rate, a block phenomenon occurs in which a discontinuous boundary occurs at the boundary between blocks. Such block formation is affected by the DCT coefficient which determines the brightness of each block and the quantization error of low frequency components.
즉 양자화 오차에 의해 블럭간에 불연속적인 밝기차가 발생할 경우 블럭화현상이 발생하게 된다. 이러한 블럭화현상ㅇ은 블럭내의 양자화 오차보다 시각적으로 더욱 심한 거부감을 준다.In other words, if a discontinuous brightness difference occurs between blocks due to quantization errors, blockization occurs. This blocking phenomenon gives a visually worse rejection than the quantization error in the block.
본 발명의 목적은 이와 같은 종래 기술의 문제점을 해결하기 위하여 압축부호화된 디지탈 영상 데이타를 신장 복호화한후 각 블럭의 경계 부분에 대해서 평활화처리를 수행함으로써 블럭화현상을 보정할 수 있는 방법을 제공하는데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a method of correcting a block phenomenon by performing a smoothing process on a boundary portion of each block after decompressing and decoding compressed coded digital image data in order to solve the problems of the prior art. .
상기 목적을 달성하기 위한 본 발명의 방법은 2차원 영상 데이타를 블럭분할하여 압축 부호와된 디지탈 영상 데이타를 수신하고 수신된 상기 디지탈 영상 데이타를 신장 복호화해서 원영상 데이타를 재현하는 디지탈 영상 수신 장치의 영상블럭화 현상보정 방법에 있어서, 상기 신장 복호화된 영상 데이타의 각 블럭의 경계부분을 평활 처리하는 것을 특징으로 한다.The method of the present invention for achieving the above object is to block-dividing two-dimensional image data to receive the compressed code and the digital image data, and to decode the received digital image data to reproduce the original image data of the digital image receiving apparatus In the image blocking phenomenon correction method, the boundary portion of each block of the decoded image data is smoothed.
이하 첨부한 도면을 참조하여 본 발명을 보다 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
본 발명의 블럭화 현상 보정방법은 블럭분할되어 압축부호화된 영상데이타의 신장 복호화후에 각 블럭경계의 경계화소값을 인정화소값에 따라 평활화 함으로써 달성된다. 평활화 처리는 경계화소에 대해서 좌우 또는 상하에 인정하는 적어도 하나 이상의 화소값들 사이에 임의의 화소값으로 대치한다. 특히 상기 임의의 화소값(P0)은 다음의 수식에 의해 결정될 수 있다.The block phenomenon correction method of the present invention is achieved by smoothing the boundary pixel values of each block boundary in accordance with the recognized pixel values after decompression of the block-divided and compressed coded image data. The smoothing process substitutes an arbitrary pixel value between at least one or more pixel values which are recognized on the left and right or top and bottom with respect to the boundary pixel. In particular, the arbitrary pixel value P 0 may be determined by the following equation.
여기서, Wi는 i 번째 가중치로서 0W1 이며이며 Pi는 i번째 화소값 n은 인접화소수이다.Here, Wi is 0W1 as the i th weight. Pi is the i-th pixel value n is the number of adjacent pixels.
물론, 상기 임의의 화소값(P0)을 인접화소들의 평균값으로 할 수도 있다.Of course, the pixel value P 0 may be set as an average value of adjacent pixels.
제1도는 본 발명에 의한 디지탈 영상 처리 장치의 블럭도 이다.1 is a block diagram of a digital image processing apparatus according to the present invention.
2차원 영상처리 데이타는 블럭분할기(10)에서 블럭분할되고 잘 알려진 DCT블럭기(20)에서 DVT계수로 변환되며 상기 DCT계수는 공지의 양자화기(30)에서 양자화되고 양자화계수는 부호화기(40)에서 압축부호화 되어 전송로 상에 공급된다. 수신된 압축부호화 데이타는 복호화기(50)에서 신장복호화되고 역양자화기(60)에서 DCT계수로 복원되고 복원된 DCT계수는 역DCT블럭(70)을 거쳐서 블럭단위로 영상복원된다. 복원된 영상데이타는 본 발명에 의한 평활화 처리를 수행하는 평활필터(80)를 거치면서 블럭화현상에 의한 잡음이 제거된다. 상기 평활화처리는 제2도에 도시된 평활화 마스크(a는 가로방향 마스크, b는 세로방향 마스크)에 의해 제3도에 도시한 블럭의 경계화소(P0)를 상기 수식(1)에 의해 구한다. 즉, 인접화소수 n=2 이므로The two-dimensional image processing data is block-divided by the block splitter 10 and converted into DVT coefficients by a well-known DCT block 20. The DCT coefficients are quantized by a known quantizer 30 and the quantization coefficients are encoded by the encoder 40. Is compressed and supplied on the transmission line. The received compressed coded data is decoded by the decoder 50, reconstructed into DCT coefficients by the inverse quantizer 60, and the decompressed DCT coefficients are image-restored in units of blocks through the inverse DCT block 70. The reconstructed image data passes through the smoothing filter 80 which performs the smoothing process according to the present invention, and the noise due to the block phenomenon is removed. In the smoothing process, the smoothing mask (a is a horizontal mask and b is a vertical mask) shown in FIG. 2 is used to obtain the boundary pixel P 0 of the block shown in FIG. . In other words, the number of adjacent pixels is n = 2
로 구할 수 있다. 세로방향의 경계화소에 대해서는 상기 세로방향 마스크(b)를 사용해서 가로방향과 동일한 방식으로 평활화 한다.Can be obtained as The border pixels in the vertical direction are smoothed in the same manner as in the horizontal direction by using the vertical mask (b).
이상과 같이 본 발명에서는 블럭분할되어 압축부호화된 영상데이타를 신장복호화함에 있어서 복원된 영상데이타의 각 블럭간 경계화소값들을 평활처리함으로써 블럭화현상을 보정할 수 있으므로 화질을 개선시킬 수 있다.As described above, in the present invention, in decompression and decoding of block-divided and compressed-encoded image data, the block image phenomenon can be corrected by smoothing the boundary pixel values between blocks of the restored image data, thereby improving image quality.
Claims (5)
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100557175B1 (en) * | 1999-07-08 | 2006-03-03 | 삼성전자주식회사 | Apparatus and method for smoothing edge of blocks in a video signal processing system |
KR100827822B1 (en) * | 2006-07-14 | 2008-05-07 | 엠텍비젼 주식회사 | Decoding revision method and decoding revision system which exclude blocking |
KR101259063B1 (en) * | 2006-06-05 | 2013-04-29 | 엘지디스플레이 주식회사 | A image processing device and blocking effect removal method of the same |
-
1992
- 1992-02-28 KR KR1019920003262A patent/KR0147549B1/en not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100557175B1 (en) * | 1999-07-08 | 2006-03-03 | 삼성전자주식회사 | Apparatus and method for smoothing edge of blocks in a video signal processing system |
KR101259063B1 (en) * | 2006-06-05 | 2013-04-29 | 엘지디스플레이 주식회사 | A image processing device and blocking effect removal method of the same |
KR100827822B1 (en) * | 2006-07-14 | 2008-05-07 | 엠텍비젼 주식회사 | Decoding revision method and decoding revision system which exclude blocking |
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KR930019021A (en) | 1993-09-22 |
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