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Watermarking Attacks and Tools
Published in Frank Y. Shih, Digital Watermarking and Steganography: Fundamentals and Techniques, 2017
Image warping performs a pixel-by-pixel remapping (or warp) of an input image to an output image. It requires an integer-sampled remapping image that is the same size as the output image. This remapping image consists of x and y channels. For each pixel in the output image, the corresponding point in the remapping image is checked to determine which pixel from the input image it will be copied to. The image grid is first warped into three dimensions and then projected back onto two dimensions. An example of a warping attack with a factor of 3 is shown in Figure 5.14.
Watermarking Attacks and Tools
Published in Frank Y. Shin, Digital Watermarking and Steganography, 2017
Image warping performs a pixel-by-pixel remapping (or “warp”) of an input image to an output image. It requires an integer-sampled “remapping image” that is the same size as the output image. This remapping image consists of x- and y-channels. For each pixel in the output image, the corresponding point in the remapping image is checked to determine which pixel from the input image will be copied. The image grid is first warped into three dimensions and then projected back onto two dimensions. An example of the warping attack with a factor of 3 is shown in Figure 5.14.
Increase of Frame Rate in Virtual Environments by Using 2D Digital Image Warping
Published in Krzysztof Gałkowski, Jeff David Wood, Multidimensional Signals, Circuits and Systems, 2001
Digital image warping is a class of image processing techniques (hat deal with the geometrie transformation of digital images (Wolbcrg 1990). Geometric transformations describe the spatial relationship between two corresponding points in two images. Wc present an interpolation method that uses an image warping technique which is based on affine transformations and where the motion vectors of the triangle's vertices are linearly interpolated. The terms 'image warping' and 'affine transformation' are used as synonyms in this text.
Curve-based image editing for product styling
Published in Computer-Aided Design and Applications, 2018
Bo Wang, Bao-Jun Li, Franca Giannini, Marina Monti, Ping Hu, Ji-Cai Liang
In image processing, image warping typically is applied to remove distortions from an image, but it is also used for artistic purposes and special effects in interactive paint programs. Additionally it could offer a valid support for design activities in fast outlining potential design solutions if suitable editing capabilities are provided. In fact, in early design activities, stylists are used to take inspiration from already existing products or elements present in nature. Therefore it would be useful if the large amount of digital images available on the web or easily obtainable by personal camera, could be directly used for the specification and visualization of new shapes. Image warping is the act of distorting a source image into a destination image according to a mapping between the source space and the destination space . The forward mapping is usually specified by the functions and, but potential gap problems exist. Better results can be obtained applying the inverse mapping to find the corresponding location in the original image for every pixel in the destination image.