摘要:
A method for characterising a colour device (401). A first transform (305) is calculated (304) from first input colours (302) and first output colours (303) measured (301) by an optical instrument (403). An intermediate set of output colour values (306) is obtained and transformed (307), using the transform (305), into a second set of input colour values (308), which are used to obtain (309) a second set of output colour values (310). The second sets of input and output colour values (308, 310) are used to calculate (311) a second transform (312). By a judicious choice of intermediate output colour values, e.g. in the Lab colour space, it is possible to obtain a transform that is extra accurate for colours for which the eye is especially sensible. Also provided are a system and a device.
摘要:
The method involves selecting a reference image from a set of images, and detecting an orientation of an image based on the orientation of the reference image. Sub-pictures of the image and the reference image are determined. The sub-pictures have the same size with respect to the image in which are positioned the sub-pictures. A visual distance between the image and the reference image is calculated. An independent claim is also included for a device of detecting orientation of an image in a set of images.
摘要:
The invention relates to a process for access to multimedia elements stored by means of digital data, an image (a, b, c, d, e, ..., m, n) being associated with each element so as to control access to the latter. In accordance with the invention, such a process is characterized in that, when one wishes to access one of these elements, a first group of images (b, c, e, f, g; a, j, e, f, g) associated with first elements is displayed, and means for displaying a second group of images (i, e, k, m, n; b, c, e, k, m) associated with second elements, which group is distinct from the first group of images, is associated with at least one of these displayed images (e).
摘要:
The invention concerns a device for generating mutual photometric effects. The invention concerns also a server for delivering photometric parameters for generating mutual photometric effects and a system including such a device and such a server. According to the invention the device (1) comprises - means for receiving and demultiplexing said visual data sets and photometric parameters respectively associated with said data sets, - means for defining said mutual photometric effects to be generated for these photometric parameters, - composition and rendering means for positioning said visual data sets in said common support space and applying said effects defined for said photometric parameters from at least one of said visual data sets to at least one other of said visual data sets so that at least one visual data set influences one other visual data set in said common support space.
摘要:
This determination comprises : defining key constant-hue leaves such as to partition the gamut mapping color space into angular hue sectors ; for each key constant hue leaf, defining a key hue leaf chroma mapping function ; for each angular hue sector, defining a continuous angular hue sector chroma mapping function such that, for any source color belonging to one of the two key constant-hue leaves delimiting this angular hue sector, this continuous chroma mapping function allows to map the chroma of said source color according to the key hue leaf chroma mapping function of the key constant-hue leaf to which said source color belongs. Preferably, this mapping functions are non linear polynomials.
摘要:
According to this method, the mapping color LUT has input colors that sample not only a source color gamut (included in an input encoding color space in which inputs colors of this LUT are encoded) but at least a portion of the input encoding color space which is not included in the source color gamut. Preferably, this color LUT further includes output colors located outside the target color gamut. Accuracy of the mapping is improved, notably for source colors located near the boundary of the source color gamut.
摘要:
This method is based on a linear combination of a first encoding of each color based on a first virtual display device notably defined by a first white and a first set of primaries corresponding to colors reflected from the scene under the illumination with the highest luminance, and of a second encoding based on a second virtual display device notably defined by a second white and a second set of primaries corresponding to colors reflected from the scene under the illumination with the lowest luminance, wherein the weight assigned to the first encoding is proportional to the luminance of said color.
摘要:
The spatial frequency analysis contained in the compressed image is used not only for decompression of images but also for the selection of an appropriate gamut mapping algorithm. Computation resources are then saved because no specific spatial frequency analysis is required for the selection of an appropriate gamut mapping algorithm.
摘要:
A method, apparatus and system for providing color grading or color correction for displays includes a plurality of virtual device models where each virtual device model has a virtual model specification (VMS) which controls a display feature. Each display includes a display specification including a display requirement or requirements. An apparatus of the present invention is configured to compare the display feature of at least one VMS against the display requirement of the display specification to determine a best match therebetween to select a virtual device model to control a display picture. Color correction is further provided in post production using the VMS to provide consistency across multiple display types.