Sentence examples for visible watermarks from inspiring English sources
Images are cropped to excise visible watermarks or digitally scrubbed to get rid of metadata using readily available digital erasors.
Visible watermarks are important in recognition and support of possessing a digital image.
Digital contents embedded with visible watermarks will overlay recognizable but unobtrusive copyright patterns to identify its ownership.
Meng and Chang [7] proposed an efficient compressed-domain content-based algorithm which applied the stochastic approximation model for Braudaway's method in the discrete cosine transform (DCT) domain by adding visible watermarks in video sequences.
For example, in [7], multiple watermarks were independently inserted into the frequency and phase of an audio signal, and in [8], the robust and semifragile watermarks were respectively embedded into the approximation and residual components of an image, while in [9], the subsampling technique was applied to an host image for the insertion of both the invisible and visible watermarks.
All of the above instructions are intended to create visible watermarks.
On the other hand, Definition 4.2 states that a visible watermark appears on a watermarked image with a predefined degree of visibility, α, and thus strictly speaking for the visible watermarking, the watermarked image is not perceptually similar to the original image.
An invisible watermarking scheme usually differs from a visible watermarking scheme, not only in the visibility factor, but also in their embedding processes.
However, for an invisible watermarking scheme, the quantified perceptual difference between an original image and its watermarked version would naturally be much lower than that for a visible watermarking scheme.
A visible watermarking scheme deliberately inserts a watermark such that it appears noticeably on the watermarked image to show some necessary information such as company logo, icon, or courtesy.
Figure 1 The visible watermark embedding procedures.
