One-dimensional signal adaptive filter for reducing blocking eff

Details One-dimensional signal adaptive filter for reducing blocking eff One-dimensional signal adaptive filter for reducing blocking eff

1998-03-10

2000-12-26

Rogers, Scott

Image analysis

Image enhancement or restoration

Image filter

382268, 382199, 382205, G06K 940, G06K 946, G06K 956, G06T 500

Patent

active

061671649

ABSTRACT:
A one-dimensional signal adaptive filtering method and a one-dimensional signal adaptive filter. The one-dimensional signal adaptive filtering method capable of reducing a blocking effect of image data when a frame is composed of blocks of a predetermined size includes the steps of: (a) applying a one-dimensional window of a predetermined size along the boundaries of the blocks to perform a predetermined gradient operation on each pixel within the one-dimensional window; (b) calculating threshold values (T) for each pixel within the one-dimensional window, which is determined by a predetermined function of a quantization step (Q); (c) comparing the results of the gradient operation on each pixel within the one-dimensional window with the corresponding calculated threshold value to generate a comparison result as a binary edge map; (d) applying a one-dimensional filter window of a predetermined size on the generated binary edge map to generate weighted values using the binary value belonging to the one-dimensional filter window; and (e) performing filtering using the generated weighted values to generate new pixel values. The effect of the method is to eliminate blocking noise from a restored block-based image, thereby enhancing an image restored from compression.

REFERENCES:
patent: 5121447 (1992-06-01), Tanioka et al.
patent: 5220616 (1993-06-01), Downing et al.
patent: 5818964 (1998-10-01), Itoh
patent: 5883983 (1999-03-01), Lee et al.

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