Abstract: A method for taking partially overlapping images of a ground surface from a camera arranged in an aircraft or a spacecraft, the method including: while the aircraft or the spacecraft is moving, acquiring images at different instants in time, separated by time intervals; detecting, during the moving, position information representative of a position and orientation information representative of an orientation of the aircraft of the spacecraft; using the position information, the orientation information, and the camera's viewing angle to determine maximal values of time intervals for which images with a predetermined amount of spatial overlap can be obtained; and adjusting the intervals towards the maximal values so as to minimize the number of the acquired images while maintaining the predetermined amount of spatial overlap.

Abstract: A method for taking partially overlapping images of a ground surface from a camera arranged in an aircraft or a spacecraft, the method including: while the aircraft or the spacecraft is moving, acquiring images at different instants in time, separated by time intervals; detecting, during the moving, position information representative of a position and orientation information representative of an orientation of the aircraft of the spacecraft; using the position information, the orientation information, and the camera's viewing angle to determine maximal values of time intervals for which images with a predetermined amount of spatial overlap can be obtained; and adjusting the intervals towards the maximal values so as to minimize the number of the acquired images while maintaining the predetermined amount of spatial overlap.

Abstract: A method for geometric referencing of multi-spectral data in a sequence of images, the images containing distinct regions representing imaged radiation in respective distinct wavelengths. The method includes selecting a subset from the sequence of images, the subset containing a plurality of images, each image of which represents a field of view that overlaps with a field of view of at least one other image in the same subset; generating a 3D model by performing photogrammetric 3D reconstruction on the images in the subset; estimating a displacement and a yaw between pairs of successive images of the sequence of images; and using the 3D model and the estimated displacement and yaw to calculate photogrammetric parameters for images of the sequence of images that are not in the selected subset. Additionally, a corresponding system and a corresponding computer program product.

Abstract: A method for performing photogrammetric 3D reconstruction of objects imaged in a sequence of images, the images containing distinct regions representing imaged radiation in respective distinct wavelengths, the method having the steps: selecting a plurality of subsets from the sequence of images, each one of the plurality of subset containing a plurality of images, each image of which represents a field of view that overlaps with a field of view of at least one other image in the same subset; generating a set of intermediate 3D models by performing photogrammetric 3D reconstruction on the images in respective ones of the subsets; and recombining the intermediate 3D models from the set of 3D models into a combined 3D model.

Abstract: A method for geometric referencing of multi-spectral data in a sequence of images, the images containing distinct regions representing imaged radiation in respective distinct wavelengths. The method includes selecting a subset from the sequence of images, the subset containing a plurality of images, each image of which represents a field of view that overlaps with a field of view of at least one other image in the same subset; generating a 3D model by performing photogrammetric 3D reconstruction on the images in the subset; estimating a displacement and a yaw between pairs of successive images of the sequence of images; and using the 3D model and the estimated displacement and yaw to calculate photogrammetric parameters for images of the sequence of images that are not in the selected subset. Additionally, a corresponding system and a corresponding computer program product.

Abstract: A method for estimating an input spectrum from sensor data acquired by an optical sensor assembly, having an aperture, a Fabry-Perot interferometer, and an optical sensor element, the method including: obtaining first calibration data representative of a spectral response function of the optical sensor assembly for a first setting of the aperture; computing second calibration data from the first calibration data, the second calibration data being representative of a spectral response function of the optical sensor assembly for a second setting of the aperture, where the second setting corresponds to a setting applied during the acquiring of the sensor data; and estimating the input spectrum as a function of the second calibration data and the sensor data. Additionally, a corresponding system for estimating an input spectrum.

Abstract: A sensing device for obtaining geometric referenced multi-spectral image data of a RoI in relative movement with respect to the device, the sensing device having: a first and second 2D sensor element, the device obtaining subsequent multi-spectral images during the relative motion of the Rol thus providing distinct spectral information for parts of a Rol using the first element; and providing, using the second element, an image of the Rol for generating geometric referencing information to be coupled to the distinct spectral information; each element capturing a sequence of frames at a respective frame rate. The first frame rate is higher than the second frame rate. The device generates intermediate geometric referencing information to be coupled to frames of the first sequence of frames for which no synchronous frame from the second sequence of frames is available, derived from temporally similar frames from the second sequence of frames.

Abstract: A method for transforming a set of spectral images, the method including: dividing the images in the set in identically arranged areas; for each of the areas, calculating a predetermined characteristic across the set of images; and, for each of the images, normalizing intensity values in each of the areas in function of the predetermined characteristic of the area. Additionally, a corresponding computer program product and a corresponding image processing system.

Abstract: A method for taking partially overlapping images of a ground surface from a camera arranged in an aircraft or a spacecraft, the method including: while the aircraft or the spacecraft is moving, acquiring images at different instants in time, separated by time intervals; detecting, during the moving, position information representative of a position and orientation information representative of an orientation of the aircraft of the spacecraft; using the position information, the orientation information, and the camera's viewing angle to determine maximal values of time intervals for which images with a predetermined amount of spatial overlap can be obtained; and adjusting the intervals towards the maximal values so as to minimize the number of the acquired images while maintaining the predetermined amount of spatial overlap.

Abstract: A method for estimating an input spectrum from sensor data acquired by an optical sensor assembly, having an aperture, a Fabry-Perot interferometer, and an optical sensor element, the method including: obtaining first calibration data representative of a spectral response function of the optical sensor assembly for a first setting of the aperture; computing second calibration data from the first calibration data, the second calibration data being representative of a spectral response function of the optical sensor assembly for a second setting of the aperture, where the second setting corresponds to a setting applied during the acquiring of the sensor data; and estimating the input spectrum as a function of the second calibration data and the sensor data.

Abstract: A sensing device for obtaining geometric referenced multi-spectral image data of a Rol in relative movement with respect to the device, the sensing device having: a first and second 2D sensor element, the device obtaining subsequent multi-spectral images during the relative motion of the Rol thus providing distinct spectral information for parts of a Rol using the first element; and providing, using the second element, an image of the Rol for generating geometric referencing information to be coupled to the distinct spectral information; each element capturing a sequence of frames at a respective frame rate. The first frame rate is higher than the second frame rate. The device generates intermediate geometric referencing information to be coupled to frames of the first sequence of frames for which no synchronous frame from the second sequence of frames is available, derived from temporally similar frames from the second sequence of frames.

Abstract: The invention deals with a method for replacing the colorant values of a raster image by a new set of colorant values that is for example optimized for a standardized printing process. According to the invention, a forward look up table is identified that transforms the colorant values in the raster image into color values. The color values in this look up table are separated into new colorant values to obtain a colorant to colorant interpolation look up table. This is done by using an inverse transformation that is based on the forward look up table using appropriate separation parameters for the standardized printing process. The method has the advantage that it enables to map pure colorant values in the original image back onto pure colorant values in the transformed image.

Abstract: The invention deals with a method for replacing the colorant values of a raster image by a new set of colorant values that is for example optimized for a standardized printing process. According to the invention, a forward look up table is identified that transforms the colorant values in the raster image into color values. The color values in this look up table are separated into new colorant values to obtain a colorant to colorant interpolation look up table. This is done by using an inverse transformation that is based on the forward look up table using appropriate separation parameters for the standardized printing process. The method has the advantage that it enables to map pure colorant values in the original image back onto pure colorant values in the transformed image.

Abstract: A method and a system for determining a characteristic of a printing system, the printing system including a printing device and a receiving substrate. Data from a pattern printed on the receiving substrate by the printing device are analyzed. Based on the analysis, an artifact characteristic of the printing system is determined automatically.

Abstract: A method and an apparatus for proofing an image on a proofing device having a set of ColB colorants at a proofing resolution ResB, wherein the image is to be output on an output device having a set of ColA colorants at a resolution ResA different from ResB, the method including (a) providing the image in a first representation having the set of ColA colorants and the resolution ResA; (b) converting the image to a second, intermediate representation having the resolution ResA and an intermediate color set that is different from the set of ColA colorants and different from the set of ColB colorants; (c) converting the image from the second, intermediate representation to a third, intermediate representation having the intermediate color set and the resolution ResB; (d) converting the image from the third, intermediate representation to a fourth representation having the set of ColB colorants and the resolution ResB.

Abstract: A system and a method for calibrating a printing device having a first light ink and a first heavy ink of a first colorant and a second light ink and a second heavy ink of a second colorant, different from the first colorant, the method including (a) defining a colorant space for the printing device, wherein the colorant space has a first colorant axis corresponding to the first light ink, a second colorant axis corresponding to the second light ink, and a set of at least one other axis, wherein each axis of the set corresponds to a colorant different from the first colorant and different from the second colorant; (b) mapping a first point for starting applying the first heavy ink when printing a color vignette (20) to a first set of colorant values in the colorant space, wherein a first starting point (11) on a path (15) in a color space (10) corresponds to the first set of colorant values, the path (15) corresponding to the color vignette (20); (c) mapping a second point for starting applying the second hea

Abstract: A method and a system are described for managing the color quality of a calibrated output device. Measurement data from a strip output by the output device are analyzed. Based on the analysis, either it is indicated that the output device matches a reference output device, or a probable cause is indicated why the output device does not match the reference output device.

Abstract: A method and a system for determining a characteristic of a printing system, the printing system including a printing device and a receiving substrate. Data from a pattern printed on the receiving substrate by the printing device are analyzed. Based on the analysis, an artifact characteristic of the printing system is determined automatically.