Method and filter for reducing the blocking effect in image tran

Details Method and filter for reducing the blocking effect in image tran Method and filter for reducing the blocking effect in image tran

1997-11-28

1999-11-09

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

382268, H04N 712

Patent

active

059824425

ABSTRACT:
For image transmission, image data is compressed block by block, and the compressed data is transmitted and decompressed. Due to an information loss during transmission, discontinuities are visible in pictures thus restored, particularly at block boundaries ("blocking effect"). The higher the bit rate, the more visible the discontinuities will be. This is improved by refining the prior art filter. Information for reducing the error is derived from the boundaries of the block, and the filter size is enlarged to 2.times.n+1 pixels, with n=2, 3, 4 preferably limited to one half the number of pixels on one side making up the block. Besides the signal and noise activity of a block, the filter determines both the pixels inside the block and the pixels outside the block. The determination is made by means of the one-dimensional filter in the horizontal and vertical directions.

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"Reduction of Blocking Effects in Image Coding", H. Reeve III et al, Optical Engineering, Jan.-Feb. 1984, vol. 23, No. 1, pp. 34-37.
"Post-Filtering of Transform-Coded Images", K Tzou, SPIE Applications of Digital Image Processing XI, vol. 974 (1988), pp., 121-126.
"One Dimensional Processing for Adaptive Image Restoration", Chan et al., IEEE International Conference on Acoustics, Speech and Signal Processing, San Diego Mar. 19-21, 1984, pp. 37.3.1-37.3.4.

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