摘要:
A method and apparatus for generating a multicolor image using halftone screens employs a dot structure dot growth pattern for one or more of the colors and a line structure dot growth pattern for at least two or more of the other colors.
摘要:
A method and apparatus is provided for processing halftone images by generating a first dot pattern corresponding to a first colour and a second dot pattern corresponding to a second colour for a video signal having at least two colours. The method includes generating the first dot pattern by halftone processing the video signal using a first screen (52), and generating the second dot pattern by halftone processing the video signal using a second screen (54), which has a complementary relationship relative to the first screen (52).
摘要:
The present invention provides an image processing method and device which can both quickly and easily execute a pseudo halftone process with a large number of output gray levels and which can always execute the pseudo halftone process in the same manner regardless of the number of output gray scales. The present invention provides an image processing device that executes a pseudo halftone process on multivalued image data comprising a plurality of planes, the device including a component (11) executing quantization and outputting for each of the plurality of density components, a component (20) determining a correction value on the basis of a sign of a quantization error in each plane and a comparison of a sum of the quantization errors with a predetermined threshold, and a component (3) correcting a value of the quantization output using the correction value and diffusing the quantization value.
摘要:
Embodiments include a method for halftoning a source image. The halftoning includes error diffusion processing of a first separation of plural color separations of a pre-rendered image after error diffusion processing a second separation of the plural color separations of the pre-rendered image. The error diffusion processing of the first separation including, for respective pixel values corresponding to the first separation, choosing respective magnitudes of the respective pixel values as a function of the error diffusion processing of the second separation. A rendered image is output which comprises the same plural color separations. The output rendered image is populated with, for the first separation, pixel information based on the respective magnitudes.
摘要:
Disclosed herein is a Moiré-free color halftone configuration for clustered dots. Unlike conventional methods, the disclosed method produces periodic hexagon rosettes of identical shapes. These exemplary hexagon rosettes have three fundamental spatial frequencies exactly equal to half of the fundamental frequency of the three halftone screens. The resultant halftone outputs are truly Moiré free, as all the fundamentals and harmonic frequencies are multiples of and thus higher in frequency than the rosette fundamental frequency. The halftone outputs resulting from the employment of the exemplary rosette design methodology provided herein, are also robust to the typical misregistration among color separations commonly found in color systems.
摘要:
A print device comprising a dither processing unit for converting multi-value data of C(cyan), M (magenta) and Y (yellow) into binary CMY data, and a black generation processing unit for generating a gray plane by a logical product of C, M and Y of the binary CMY data, and generating K (black) in a gray pixel position as part of a gray pixels with a probability according to the density of gray pixels in the gray plane but not generating K in the remaining gray pixel positions.
摘要:
A macro-pixel used in an image rendering process for forming an image using a matrix of macro-pixels. The macro-pixel comprises a plurality of rectilinear parallel rows. All rows extend across the matrix in the same direction and each one of the rows is capable of at least partially adopting at least one of a color state and an off state. The on state includes the presence of color while the off state includes the absence of color. The on state comprises non-key and/or key colors. The non-key colors can be cyan, magenta, yellow, and/or any other color while the key color is normally black. The macro-pixel also includes columns formed by micro-pixels which may be turned on in a predetermined order. The predetermined order permits maximum distance between rows used for key colors and rows used for non-key colors.
摘要:
La présente invention concerne un procédé d'établissement de signaux de trame (1) par décision (3) de niveau de saturation chromatique et diffusion (60) d'erreur, caractérisé en ce qu'il comporte :
une étape de représentation (15) des signaux représentatifs des pixels en vecteurs dans un espace (2) pluridimensionnel dont au moins certaines dimensions correspondent à des composantes chromatiques et/ou de luminance et ne comportant pas plusieurs dimensions pour représenter une même couleur à des niveaux de saturation chromatique différents ; une étape de décision (3) des niveaux de saturation chromatique correspondant aux coordonnées des vecteurs dans les différentes dimensions (21, 22) représentatives des différentes composantes chromatiques des pixels successifs, l'étape de représentation dans un espace (2) pluridimensionnel étant distincte de l'étape de décision (3) des niveaux de saturation chromatique.