07221761 is referenced by 21 patents and cites 23 patents.

A method and an apparatus for error resilient, digital image scrambling are disclosed. Error resilience scrambling is produced by shuffling transform coefficients between arrays of coefficients arranged along an axis substantially orthogonal to the axis along which packetization of the coefficients proceeds. Scrambling transform coefficients requires a reasonable level of processing resources and has minimal impact on the efficiency of the compression process. Shuffling can be performed in a number of ways to provide good access security and a variety of security. Scrambling the image data in a direction substantially orthogonal to the direction of packetization of the transform coefficients distributes any transmission error in the image reducing the effects of data error or loss on the displayed image.

Title
Error resilient digital video scrambling
Application Number
9/665215
Publication Number
7221761 (B1)
Application Date
September 18, 2000
Publication Date
May 22, 2007
Inventor
Wenjun Zeng
Vancouver
WA, US
Sachin Deshpande
Vancouver
WA, US
Agent
Chernoff Vilhauer McClung & Stenzel
Assignee
Sharp Laboratories of America
WA, US
IPC
G06K 9/36
H04N 7/167
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