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Abstract: The disclosure relates to a method including: capturing a sequence of images of a scene with a camera at different focus positions according to a predetermined focus schedule that specifies a chronological sequence of focus positions of the camera, extracting image features of captured images, after having extracted and stored image features from said captured images, processing a captured image whose image features have not yet been extracted, said processing comprising extracting image features from the currently processed image and storing the extracted image features, said processing further comprising aligning image features stored from the previously captured images with the image features of the currently processed image, and generating a multi-dimensional tensor representing the image features of the processed images aligned to the image features of the currently processed image, and generating a two-dimensional depth map using the focus positions in the predetermined focus schedule and the generated.
Filed: May 16, 2022
Publication date: December 1, 2022
Inventors: Sabato Ceruso, Ricardo Oliva-García & José M. Rodríguez-Ramos
Abstract: The invention relates to a computer-implemented method for detecting barcodes in a digital image represented as a two-dimensional digital image array comprising: applying a filter to the image array, computing a discrete Radon transformation of the filtered image array, wherein the discrete Radon Transformation is computed for a plurality of discrete lines across the filtered image array, wherein for each given discrete line with a given slope the discrete Radon transformation is computed for a number of different displacements of the given discrete line, wherein said number of displacements is less than two times a dimension of the image array, detecting in the output of the discrete Radon transformation of the filtered image array the vertex points of a pattern, and converting the detected vertex points back to discrete lines in the image array for constraining the location of a barcode present in the digital image.
Filed: May 9, 2019
Publication date: March 25, 2021
Inventors: Óscar Gómez-Cárdenes & José M. Rodríguez-Ramos.
Abstract: A system consisting of a phase camera with microlenses placed in the focal point of a converging lens, wherein the camera data, processed using a combined Fourier “Slice” and fast Fourier transform edge detection technique, provide both a three-dimensional wavefront map and a real scene depth map within a broad range of volumes. The invention is suitable for use in any field where wavefronts need to be known such as earth-based astronomical observation, ophthalmology, etc., as well as in fields requiring metrology, e.g. real scenes, CCD polishing, automobile mechanics, etc. The invention is applied to the particular case of atmospheric tomography using ELTs (large-diameter telescopes: 50 or 100 meters).
Filed: January 18, 2007
Publication date: April 15, 2010
Applicant: UNIVERSIDAD DE LA LAGUNA
Inventors: José M. Rodríguez-Ramos, Fernando Rosa-González & José G. Marichal-Hernández.
Abstract: The invention relates to a method for calculating the focal stack associated with an object space from the plenoptic function thereof, using a sum transform along the length of constrained planes in discrete hypercubes, which allows the computing time to be considerably reduced. The invention also relates to a method for increasing the resolution of the focal stack obtained. In addition, the invention relates to two methods for the real-time recovery of the depths and moduli and phases of the complex amplitude of the wavefront respectively in each position of the surfaces of a three-dimensional scene and to a system adapted for carrying out the aforementioned methods.
Filed: January 15, 2009
Publication date: February 10, 2011
Applicant: UNIVERSIDAD DE LA LAGUNA
Inventors: José M. Rodríguez-Ramos, José G. Marichal-Hernández, Fernando Rosa-González & Fernando Pérez-Nava
Abstract: A method for determining the complex amplitude of the electromagnetic field associated with a scene, comprising a) capturing a plurality of images of the scene by means of a photographic camera, the images being focused in planes of focus arranged at different distances, wherein the camera comprises a lens of focal length F and a sensor arranged at a certain distance from the lens in its image space, taking at least one image pair from the plurality of images and determining the accumulated wavefront to the conjugate plane in the object space corresponding to the intermediate plane with respect to the planes of focus of the two images of the pair.
Abstract: The present invention relates to a system and method for reconstruction of temporal wavefront changes for use in an optical system comprising: measuring the distribution function of the light intensity, e.g. the two-dimensional distribution function of the light intensity, in at least two different images taken at different times, wherein said images are taken in at least one optical plane, e.g. the same optical plane, of the optical system.
Filed: October 30, 2019
Publication date: January 20, 2022
Inventors: Sergio Bonaque-González, Juan M. Trujillo-Sevilla & José M. Rodríguez-Ramos.