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US 2018/0122035 A1Published application
Full-color visibility model using csf which varies spatially with local luminance
AssigneeDigimarc Corporation
InventorsAlastair M. Reed, Kristyn R. Falkenstern, David Berfanger, Yang Bai
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Abstract
The present disclosure relate generally to image signal processing, color science and signal encoding. Signal encoding can be applied to color image data through use of a luminance contrast sensitivity function and a chrominance contrast sensitive function. Of course, other features, combinations and claims are disclosed as well.
Claims27
An apparatus comprising:
- memory storing:
- i) a luminance contrast sensitivity function (CSF1), ii) a chrominance contrast sensitivity function (CSF2), and iii) data representing color imagery;
- and
- means for estimating degradation of image areas associated with an application of signal encoding in the data representing color imagery by applying the CSF1 and the CSF2 to the data representing color imagery, in which the CSF1 varies depending on luminance values associated with local regions of the data representing color imagery, and in which the CSF1 is used for processing luminance data and the CSF2 is used for processing chrominance data;
- means for changing the data representing color imagery with signal encoding, in which the signal encoding is guided based on results obtained from said means for estimating including predicted degradation of image areas.
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A method comprising:
- obtaining color image data;
- changing the color image data with signal encoding, the signal encoding comprising a payload, said changing yielding encoded color image data;
- comparing the encoded color image data to the color image data to determine a visibility map, the visibility map comprising a luminance contrast sensitivity function (CSF1) and a chrominance contrast sensitivity function (CSF2);
- weighting the signal encoding per the visibility map so that local image areas within the color image data are weighted differently, said weighting yielding weighted signal encoding;
- encoding the color image data with the weighted signal encoding to yield locally varied encoded color image data.
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A non-transitory computer readable medium comprising instructions, which when executed configure one or more processors to:
- access color image data;
- change the color image data with signal encoding, the signal encoding comprising a payload, said changing yielding encoded color image data;
- compare the encoded color image data to the color image data to determine a visibility map, the visibility map comprising a luminance contrast sensitivity function (CSF1) and a chrominance contrast sensitivity function (CSF2);
- weight the signal encoding per the visibility map so that local image areas within the color image data are weighted differently to yield weighted signal encoding;
- encode the color image data with the weighted signal encoding to yield locally varied encoded color image data.
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Dependencies are inferred from the claim text.