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Method and apparatus for concealing errors in a transmitted video signal
| Details |
Inventors: Kim, Jin-Hun;
Assignee: Daewoo Electronics Co., Ltd. (Seoul, KR)
Primary Examiner: Chin; Tommy P.
Assistant Examiner: Lee; Y.
Attorney, Agent or Firm: Anderson, Kill & Olick, P.C.
For concealing channel errors in an image signal divided into a multiplicity of blocks of M.times.N pixels, M and N being positive integers, a lost region is detected, wherein the lost region is of a polygonal form having a plurality of sides and includes one or more connected lost blocks, each lost block containing a channel error. And then, a reference region of pixels including a plurality of groups of first and second pixels, each group of first pixels being adjacent to a side of the lost region and each group of second pixels being adjacent to a first group of pixels is found. Thereafter, edge pixels having non-zero valued edge magnitudes, an edge magnitude for a pixel representing differences between pixels residing adjacent to the pixel among pixels within the reference region are determined. And each edge point representing an edge pixel having a largest edge magnitude among the edge pixels included in groups of first and second pixels for a side of the lost region is detected. Thereafter, the channel errors of the lost region are rectified by compensating pixels within the lost region based on the edge points and the pixels of the reference region. |
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DETAILED DESCRIPTION It is, therefore, a primary object of the invention to provide an improved method and apparatus for rectifying channel errors in a transmitted video signal utilizing edge information included therein.
In accordance with the present invention, there is provided a method for concealing channel errors in an image signal, wherein the image signal is divided into a multiplicity of blocks of M.
times.
N pixels, M and N being positive integers, respectively, the method comprising the steps of: (a) detecting a lost region, wherein the lost region is of a polygonal form having a plurality of sides and includes one or more connected lost blocks, each lost block containing a channel error; (b) finding a reference region of pixels, wherein the reference region includes a plurality of groups of first pixels and a corresponding number of groups of second pixels, each group of first pixels being adjacent to a side of the lost region and each group of second pixels being adjacent to a group of first pixels, each group of first pixels being placed between a group of second pixels and the lost region; (c) determining edge pixels among the pixels within the reference region, each edge pixel having a non-zero valued edge magnitude, the edge magnitude for an edge pixel representing differences between pixels residing adjacent to the edge pixel; (d) detecting edge points, each of the edge points representing an edge pixel having a largest edge magnitude among edge pixels included in a group of first pixels and a group of second pixels for a side of the lost region; and (e) rectifying the channel errors of the lost region by compensating all pixels within the lost region based on the edge points and the pixels of the reference region.
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Image Analysis 
