Spectrum pre-shaping in video
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United States of America Patent
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May 29, 2018
Issued Date -
N/A
app pub date -
Mar 28, 2016
filing date -
Mar 28, 2016
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Abstract
Information bits may be superimposed onto a transmitted image while reducing or minimizing the effects of the superimposed information bits on the transmitted image signal's frequency spectrum or image quality. A placement of superimposed information bits onto pixels of an image signal to be transmitted may be determined by testing a placement functions to determine whether the spectrum and/or image quality of the image signal with the superimposed information bits placed according to a placement function meets system criteria. Successive placement functions may be tested until an acceptable placement function is found. The information bits may be superimposed onto complete pixels or the information bits may be superimposed onto one or more least significant bits (LSBs) of each of the selected pixels. A transmitter may transmit superimposition information associated with a transmitted image to a receiver. A receiver may use the superimposition information to extract the information bits.
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