摘要:
A method and system to generate a moiré-free to all-orders N-color screen-set by a lattice-based screen design the method including choosing a lattice in frequency space with basis vectors u1 and u2 such that (∥{right arrow over (u)}1∥,∥{right arrow over (u)}2∥,∥{right arrow over (u)}1±{right arrow over (u)}2∥)>f min, where f min is the minimum moiré invisible to the human eye, and choosing a set of N pairs of fundamental frequency vectors on the vertices of this lattice to be the screen vectors.
摘要:
A method for designing a screen set for color halftoning includes selecting a screen set that includes at least two screens. The screens are applied to a uniform color image so as to form a set of corresponding colorant halftones. The colorant halftones are superposed to form a color halftone. A spatial frequency spectrum of the color halftone is calculated. Maxima of the spatial frequency spectrum that occur at two effective frequencies are identified, the two effective frequencies being located in two adjacent quadrants of a complex spatial frequency space. A magnitude of each effective frequency is compared with a predetermined frequency magnitude. The screen set is accepted for future application for color halftoning only if both effective frequency magnitudes are greater than the predetermined frequency magnitude. Relating computer program product and data processing system are also disclosed.
摘要:
Access requests (12) that are to be scheduled to an information storage system (18) include realtime access requests and non-realtime access requests. The realtime access requests are associated with respective completion deadlines. Pending ones of the access requests (12) that are awaiting submission to the information storage system (18) are received. Outstanding ones of the access requests (12) that have been submitted to the information storage system (18) and are awaiting completion by the information storage system (18) are tracked. The pending access requests are submitted to the information storage system (18) based on rules that prioritize the submission of pending access requests such that realtime ones of the pending access requests and realtime ones of the outstanding access requests will be serviced by the information storage system (18) by their associated completion deadlines.
摘要:
Processing of at least one digital image includes performing first and second separable block transforms in first and second directions; modifying results of the second block transforms; and performing first and second separable inverse block transforms in the first and second directions on the modified results. Transform coefficients are re-used while performing at least one the transforms. The processing can be performed on 2-D signals such as still images and 3-D signals such as video.
摘要:
A method for reducing blur from an image is described. The method includes accessing a blurred image, wherein the blurred image has a width and a length that can be different. The method further includes converting the blurred image into a frequency domain representation of the blurred image and determining an angle of blur from the frequency domain of the blurred image. The method further includes rotating the frequency domain representation of the blurred image by the angle of blur and determining a size of the blur from the rotated frequency domain representation of the blurred image. The method further includes determining a blur kernel associated with the blur, the blur kernel comprising the angle of blur and the size of said blur and de-convoluting the blurred image according to the blur kernel to reduce the blur.
摘要:
A project management system (10) and method (250) are included. The project management system (10) includes a production database (14) in memory (15) to store project data (20). The project data (20) can include workflow resource data (16) describing workflow resources (54, 56) and feedback data (17) obtained for each workflow step (52) of a plurality of projects (18) of a project type (152). The project management system (10) also includes a processor (27) to access the memory (15) and to execute computer readable instructions including a production learning module (26) to analyze the workflow resource data (16) and the feedback data (17) to generate predictive project data (12). The predictive project data (12) can describe a predicted workflow (154) for a given project (18) of the project type (152) based on the workflow resources (54, 56).
摘要:
An electronic image processor (200) for enhancing an artistic intent of an image comprises: an input (210) to receive digital image data of an image to be enhanced; a classifier (220) to identify and classify regions in an image, including assigning to each region one of plural predetermined classifications and a respective degree of confidence in the classification, on the basis of the context of the region within the image, each classification being associated with a perceived degree of saliency of the region to a human viewer of the image; and an enhancer (250) to enhance regions of the image by a degree of enhancement determined at least in part by the respective classification and by the degree of confidence in the classification.
摘要:
Disclosed is a computer implemented method of detecting a defect in a printed image, the method comprising the steps of: receiving a target image comprising digital image data representing a scan of the printed image; receiving a reference image comprising digital image data representing a reference of the printed image; calculating a structural dissimilarity measure, D, associated with a target pixel located in the target image and a reference pixel located in the reference image; and, determining on the basis of the structural dissimilarity measure whether a defect is present at the target pixel, wherein the structural dissimilarity measure is calculated using a structural measure, s, and a contrast measure, c; the structural measure calculated using a spatial cross-correlation associated with a target region, {right arrow over (x)}, containing the target pixel and a reference region, {right arrow over (y)}, containing the reference pixel, and the contrast measure calculated using a standard deviation associated with the target region, and a standard deviation associated with the reference region.
摘要:
A method for predicting an appearance of a rendering by a printer of a digital halftone representation of a continuous-tone image includes calculating a predicted absorptance value of a dot of a rendered halftone of the digital halftone representation. The dot corresponds to a pixel of the digital halftone representation. The predicted absorptance value is based on a configuration of pixel values of pixels in an immediate neighborhood of the pixel, and on a weighted contribution of a pixel value of each pixel in an outer neighborhood of the pixel. The method may be incorporated into a halftoning technique. Relating computer program product and data processing system are also disclosed.
摘要:
A method for generating a clustered halftone representation of a continuous-tone image for printing includes applying a search technique. In the search technique, evaluation of a similarity between an initial halftone and the continuous-tone image includes application of an initialization filter to an initial error image that represents a difference between the initial halftone and the continuous-tone image. Evaluation of a similarity between each updated halftone, formed by modifying a previously-evaluated halftone, and the continuous-tone image includes application of an update filter that is different from the initialization filter to an updated error image that represents a difference between the updated halftone and the continuous-tone image. Relating computer program product and data processing system are also disclosed.