Data error concealment
AssigneeSony United Kingdom Limited
InventorsRobert J. D. Lawlor, James H. Wilkinson
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Abstract
Error concealment apparatus for concealing corrupted data elements in frequency separated digital image data (such as sub-band coded image data) is described. Depending on the spatial frequency represented by a corrupted data element, one of a number of error concealment means is selected to conceal the error. In this way the error concealment used can be tailored to suit the different properties of the various spatial frequency components in the frequency separated image.
Claims27
Error concealment apparatus for concealing corrupted data elements in digital image data having a plurality of elements representing respective spatial frequency components of a frequency separated image in a two-dimensional spatial frequency domain, said error concealment apparatus comprising:
- (i) a plurality of error concealment means;
- and
- (ii) selecting means for selecting one of said error concealment means to conceal a corrupted data element according to said spatial frequency component represented by said corrupted data element.
A method of concealing a corrupted data element in digital image data having a plurality of elements representing respective spatial frequency components of a frequency separated image in a two-dimensional spatial frequency domain, said method comprising selecting one of a plurality of error concealment means to conceal said corrupted data element according to said spatial frequency component represented by said corrupted data element.
Error concealment apparatus for concealing corrupted data elements in digital image data comprising a plurality of elements representing respective sub-bands of a frequency separated image in a two-dimensional spatial frequency domain, each of said sub-bands representing a respective spatial frequency range, said error concealment apparatus comprising:
- a plurality of error concealment means;
- and
- selecting means for selecting one of said error concealment means to conceal one of said corrupted data elements according to said spatial frequency range of the sub-band containing the corrupted data element.
Error concealment apparatus for concealing corrupted data elements in digital image data comprising a plurality of elements representing respective spatial frequency components of a frequency separated image in a two-dimensional spatial frequency domain, said error concealment apparatus comprising:
- a plurality of error concealment means, in which one of said error concealment means comprises two-dimensional spatial concealment means for interpolating a replacement value for a corrupted data element from all of said elements adjacent in the two-dimensional spatial frequency domain to said corrupted data element in the frequency separated image data;
- and
- selecting means for selecting one of said error concealment means to conceal one of said corrupted data elements according to said spatial frequency component represented by said corrupted data element.
Error concealment apparatus for concealing corrupted data elements in digital image data comprising a plurality of elements representing respective spatial frequency components of a frequency separated image in a two-dimensional spatial frequency domain, said error concealment apparatus comprising:
- a plurality of error concealment means, in which one of said error concealment means comprises two-dimensional spatial concealment means for interpolating a replacement value for a corrupted data element from elements which are horizontally adjacent in the two-dimensional spatial frequency domain and elements which are vertically adjacent in the two-dimensional spatial frequency domain to said corrupted data element in the frequency separated image data;
- and
- selecting means for selecting one of said error concealment means to conceal one of said corrupted data elements according to said spatial frequency component represented by said corrupted data element.
Error concealment apparatus for concealing corrupted data elements in digital image data comprising a plurality of elements representing respective spatial frequency components of a frequency separated image in a two-dimensional spatial frequency domain, said error concealment apparatus comprising:
- a plurality of error concealment means, in which one of said error concealment means comprises vertical spatial concealment means for interpolating a replacement value for a corrupted data element from elements vertically adjacent in the two-dimensional spatial frequency domain to said corrupted data element in the frequency separated image data;
- and
- selecting means for selecting one of said error concealment means to conceal one of said corrupted data elements according to said spatial frequency component represented by said corrupted data element.
Error concealment apparatus for concealing corrupted data elements in digital image data comprising a plurality of elements representing respective spatial frequency components of a frequency separated image in a two-dimensional spatial frequency domain, said error concealment apparatus comprising:
- a plurality of error concealment means, in which one of said error concealment means comprises horizontal spatial concealment means for interpolating a replacement value for a corrupted data element from elements horizontally adjacent in the two-dimensional spatial frequency domain to said corrupted data element in the frequency separated image data;
- and
- selecting means for selecting one of said error concealment means to conceal one of said corrupted data elements according to said spatial frequency component represented by said corrupted data element.
Error concealment apparatus for concealing corrupted data elements in digital image data comprising a plurality of elements representing respective spatial frequency components of a frequency separated image in a two-dimensional spatial frequency domain, said error concealment apparatus comprising:
- a plurality of error concealment means, in which one of said error concealment means comprises spatial replacement means for replacing a corrupted data element by a value of a single other element adjacent in the two-dimensional spatial frequency domain to said corrupted data element in the frequency separated image data;
- and
- selecting means for selecting one of said error concealment means to conceal one of said corrupted data elements according to said spatial frequency component represented by said corrupted data element.
Error concealment apparatus for concealing corrupted data elements in digital image data comprising a plurality of elements representing respective spatial frequency components of a frequency separated image in a two-dimensional spatial frequency domain, said error concealment apparatus comprising:
- a plurality of error concealment means, in which one of said error concealment means comprises constant substitution means for replacing a corrupted data element by a predetermined constant value;
- and
- selecting means for selecting one of said error concealment means to conceal one of said corrupted data elements according to said spatial frequency component represented by said corrupted data element.
Dependencies are inferred from the claim text.