Abstract: A system and method for characterizing color separation misregistration of a multi-color printing system utilizing a broadband multi-channel scanning module, such as an RGB scanner, are provided. The system and method include generating a spectral reflectance data structure corresponding to a broadband multi-channel scanning module. The spectral reflectance data structure includes at least one parameter. The at least one parameter may correspond to the broadband multi-channel scanning module and/or a printing module. The system and method further provide for calibrating a spectral-based analysis module by utilizing the spectral reflectance data structure. The system and method also include characterizing color separation misregistration utilizing the calibrated spectral-based analysis module by examining at least one plurality-separation patch.

Abstract: Images within an image repository related to a selected image may be located despite cropping, rotating, and/or the application of a variety of other distortions to either the selected image and/or images in the image repository. Described exemplary approaches may use image digests produced using a multi-step process. In a first step, a discrete Fourier transform may be applied to produce an M×N frequency-based image matrix from an M×N image matrix containing elements that represent spatial image pixel values. In subsequent steps, matrix approximations may be applied to reduce the M×N frequency-based image matrix and to produce an image digest that reflects the content of the image. Further, an approach is described for generating a search threshold value that may be used to determine whether images digests associated with images in a repository are sufficiently similar to a search digest to be returned in a search result.

Abstract: A device calibration method based on two-dimensional calibration transform that allows complete control of two-dimensional planes in the three-dimensional CMY (Cyan, Magenta, and Yellow) cube. Two-dimensional planes can be identified in the three-dimensional CMY cube as a primary plane and projected onto two-dimensional calibration lookup tables (LUTs) for C, M, and Y. The LUTs are filled with CMY colorant values that will maintain a fixed color (e.g. CIELAB) response within the chosen primary planes. There are three possible realizations depending upon which primary diagonal CMY plane is chosen. This technique can be used to calibrate an engine over time and to bring two or more engines to the same desired state.

Abstract: Disclosed are systems and methods for color calibration incorporating gray-component replacement, and more particularly, controlling gray component replacement in a color output device by applying a pre-defined transformation to a plurality of non-black channels to obtain at least one intermediate variable, and determining at least one output black (K) value from both the black channel input value and the intermediate variable, in order to provide control of gray component replacement in the color output device.

Abstract: A method for compensating for color drift in a printer includes determining a first true tone response curve for a color channel when said printer is in a first state. A first estimated tone response curve for the color channel is also determined when said printer is in the first state. A second estimated tone response curve for the color channel is determined when the printer is in a second, color-drifted state relative to the first state. A second true tone response curve for the color channel is mathematically predicted using the first true tone response curve, the first estimated tone response curve, and the second estimated tone response curve. The first and second estimated tone response curves are estimated using a 2×2 printer model. A printing apparatus includes an image processing unit for implementing the color-drift correction process.

Abstract: Digital fingerprinting using synchronization marks and watermarks. At a watermark embedder, an input host signal is divided into regions, and a subset of the regions is selected to receive synchronization marks. Respective synchronization marks are then embedded into the selected regions. At a receiver, an input signal is divided into regions, and a subset of the regions is synchronized with additional regions, which were defined by the embedder when producing the signal that is input to the receiver. Also, the receiver can model any geometric distortion undergone by the input signal between the embedder and the receiver.

Abstract: Described herein is one or more implementations that produce a new representation of a digital good (such as an image) in a new defined representation domain. In particular, the representations in this new domain are based upon matrix invariants. More particularly still, the specific matrix invariants described herein include non-negative matrix factorizations (NMF).