Signal rich art is an alternative paradigm for watermarking, in which we embed a signal in an image or software application such as a website or app as a visible artistic pattern. In this paper we present a new algorithm for generating signal carrying patterns from a dictionary of objects which we call object placement. In an alternative approach, called object position modulation, we locally perturb the positions of objects in a given pattern to embed the signal. We also present advances in previous techniques.
This paper presents the design and implementation of an encoder and decoder of a colored barcode with high data density and storage capacity and freedom in shape. The approximately three times higher data density compared to conventional 2D matrix codes such as DataMatrix, QR or Aztec code is achieved by the use of eight colors and enables new applications, especially in the endconsumer market as well as in IT security. The challenges associated with the use of the color channel in printing with conventional office printers and recording by smartdevices under typical scenarios are addressed. The flexibility in the barcode shape is achieved by combining a primary and several secondary symbols according to a given scheme and give the necessary freedom for various applications. The presented code stores colors redundantly in a color palette as a reference in order to provide high robustness. JAB code, Just Another Barcode, has been specified, implemented, tested and is avaiable in github and www.jabcode.org under the license LGPL 2.1. JAB code is currently in the standardization process at the International Organization for Standardization ISO.