Such embedded computing units are called PEIDs (product embedded information devices).
The original coefficient is assigned to the corresponding number by using the embedded information.
The embedded information is hidden and linked inseparably with the source data structure.
When the value of is very large, the embedded information causes great image distortion.
Various matrix permutation algorithms and clustering methods with validation indices are implemented for extracting embedded information.
Paid photographic contributors take the panoramic photos, "scapes", that serve as the canvasses for embedded information contributed by users.
The considered approach allows also retrieving the embedded information from a tone-mapped LDR version of the watermarked HDR image.
We have also investigated the possibility of extracting the embedded information from tone-mapped versions of the attacked HDR images.
Therefore, when the image gets distorted, it is definitely feasible to determine the feature regions with embedded information.
Nevertheless, tampering effect on the original image would be highly intense, if there are more regions with embedded information.
Figure 4 b depicts the variation in the embedded information, when the image is rotated by 50°.
