Method of and system for enhancing distorted graphical information
AssigneeAT&T Corp.
InventorsNuggehally S. Jayant, Tsann-Shyong Liu
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Abstract
A system for and method of enhancing image/video signals to be decoded is disclosed. The system for and method of post-filtering uses, preferably, a temporal filter and a spatial filter, both of which are adaptive but neither is required to be adaptive. However, the system for and method of post-filtering may also be used with only an adaptive spatial post-filter. In this case, the performance is upper-bounded by the performance of systems using both the adaptive temporal and adaptive spatial post-filter.
Claims7
A method of enhancing a distorted video signal, the distorted video signal comprising a set of image matrices adapted to be transmitted over a transmission medium of a digital communications setup, the digital communications setup comprising a coder, a decoder, and the transmission medium, the method comprising the steps of:
- (a) filtering the set of image matrices with a first post-filter to generate a set of image intensity matrices;
- and
- (b) filtering the set of image intensity matrices with a second post-filter to generate a set of enhanced image signals, the filtering comprising:
- (1) classifying an image intensity matrix in the set of image intensity matrices into a set of edge pixels and a set of non-edge pixels;
- (2) filtering the set of edge pixels with a first sub-filter of the second filter to generate a first portion of an enhanced image matrix in the set of enhanced image signals;
- (3) classifying the non-edge pixels into a set of smooth pixels and non-smooth pixels;
- (4) filtering the smooth pixels with a second sub-filter of the second filter to generate a second portion of the enhanced image matrix;
- (5) classifying the non-smooth pixels into a set of moving pixels and a set of non-moving pixels, the set of non-moving pixels comprising a third portion of the enhanced image matrix;
- (6) filtering the set of moving pixels with a third sub-filter of the second filter to generate a fourth portion of the enhanced image matrix;
- (7) combining the first portion, the second portion, the third portion, and the fourth portion to form the enhanced image matrix;
- and
- (8) repeating steps (b)(1) through (b)(7) for other enhanced image matrices in the set of enhanced image signals.
Dependencies are inferred from the claim text.