Watermark payload encryption for media including multiple watermarks

Abstract

A media signal is analyzed for an expected error rate. Data is steganographically encoded in the media signal using an amount of error robustness coding that is determined based in part on the expected error rate. To decode the data from the media signal, the media signal is analyzed to determine an expected error rate. The steganographically encoded data is decoded using an amount of error robustness coding that is determined based in part of the expected error rate.

1 . A method comprising:
 analyzing, using a processor, a media signal for an expected error rate; and   steganographically encoding data in the media signal using an amount of error robustness coding, wherein the error robustness coding is determined based at least in part on the expected error rate.   
     
     
         2 . The method of  claim 1 , further comprising:
 subdividing the media signal into blocks; and   measuring the expected error rate for each block.   
     
     
         3 . The method of  claim 2 , wherein the blocks are a fixed size. 
     
     
         4 . The method of  claim 2 , wherein the amount of error robustness coding varies between blocks. 
     
     
         5 . The method of  claim 1 , further comprising transmitting the media signal. 
     
     
         6 . The method of  claim 1 , wherein the amount of error robustness coding comprises selecting a number of times to repeat a message symbol. 
     
     
         7 . The method of  claim 1 , wherein the amount of error robustness coding comprises selecting an error correction code. 
     
     
         8 . The method of  claim 1 , wherein analyzing the media signal for the expected error rate uses a model of the media signal. 
     
     
         9 . The method of  claim 1 , wherein analyzing the media signal for the expected error rate comprises analyzing a channel of the media signal. 
     
     
         10 . A method comprising:
 analyzing, using a processor, a media signal for an expected error rate; and   decoding steganographically encoded code in the media signal using an amount of error robustness coding, wherein the error robustness coding is determined based at least in part on the expected error rate.   
     
     
         11 . The method of  claim 10 , further comprising receiving the media signal. 
     
     
         12 . A non-transitory computer readable medium comprising instructions stored therein, the instructions comprising:
 instructions to analyze a media signal for an expected error rate; and   instructions to steganographically encode data in the media signal using an amount of error robustness coding, wherein the error robustness coding is determined based at least in part on the expected error rate.   
     
     
         13 . The non-transitory computer-readable medium of  claim 12 , further comprising:
 instructions to subdivide the media signal into blocks; and   instructions to measure the expected error rate for each block.   
     
     
         14 . The non-transitory computer-readable medium of  claim 13 , wherein the blocks are a fixed size. 
     
     
         15 . The non-transitory computer-readable medium of  claim 13 , wherein the amount of error robustness coding varies between blocks. 
     
     
         16 . The non-transitory computer-readable medium of  claim 13 , further comprising instructions to transmit the media signal. 
     
     
         17 . The non-transitory computer-readable medium of  claim 12 , wherein the amount of error robustness coding comprises selecting a number of times to repeat a message symbol. 
     
     
         18 . The non-transitory computer-readable medium of  claim 12 , wherein the amount of error robustness coding comprises selecting an error correction code. 
     
     
         19 . The non-transitory computer-readable medium of  claim 12 , wherein instructions to analyze the media signal for the expected error rate uses a model of the media signal. 
     
     
         20 . The non-transitory computer-readable medium of  claim 12 , wherein instructions to analyze the media signal for the expected error rate comprises instructions to analyze a channel of the media signal.