Luminance evaluation
AssigneeThomson Licensing
InventorsShan He, Jeffrey Adam Bloom, Dekun Zou
Life of this patent
Estimating the term…
Abstract
A method comprises providing a change to apply to video; dividing video into blocks; creating propagation map which captures only specific changes to blocks that would be changed by the application of the change; evaluating the change based on a luminance criterion as being a perceptible change or an imperceptible change; for propagation maps of an imperceptible change, storing the propagation map to a list, wherein the propagation map is the principle data structure to be applied to the video. The propagation map can be created by using motion vector changes associated with the change.
Claims32
A method comprising the steps of:
- selecting a watermark that can be embedded in an encoded video image having a given luminance, wherein the video image comprises blocks;
- estimating a quantitative value of change in the given luminance of the video image if the watermark were embedded in the encoded video image, wherein the estimated change in luminance is a function of the prediction of the blocks;
- accepting or rejecting the watermark responsive to the quantitative value comprising:
- using the estimated luminance change as a fidelity criterion;
- evaluating the watermark based on said fidelity criterion as being a perceptible change or an imperceptible change;
- accepting watermarks which result in imperceptible changes;
- adding accepted ones of the watermarks to a list, wherein the watermarks added to the list are acceptable watermarks for embedding.
An apparatus comprising a processor configured to perform the steps of:
- selecting a watermark that can be embedded in an encoded video image having a given luminance, wherein the video image comprises blocks;
- estimating a quantitative value of change in the given luminance of the video image if the watermark were embedded in the encoded video image, wherein the estimated change in luminance is a function of the prediction of the blocks;
- accepting or rejecting the watermark responsive to the quantitative value comprising:
- using the estimated luminance change as a fidelity criterion;
- evaluating the watermark based on said fidelity criterion as being a perceptible change or an imperceptible change;
- accepting watermarks which result in imperceptible changes;
- and
- rejecting watermarks which result in perceptible changes;
- and,
- adding accepted ones of the watermarks to a list, wherein the watermarks added to the list are acceptable watermarks for embedding.
Dependencies are inferred from the claim text.