Browsing Procesamiento de Señales e Imágenes Digitales by Title
Now showing items 14-22 of 22
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Joint reconstruction techniques for ultrasonic attenuation imaging
(Pontificia Universidad Católica del PerúPE, 2024-05-08)El ultrasonido cuantitativo (QUS, por sus siglas en inglés) es una modalidad de imagen no invasiva que caracteriza numéricamente los tejidos para el diagnóstico médico. Los estimadores QUS se basan en parámetros acústicos ... -
Multi-scale image inpainting with label selection based on local statistics
(Pontificia Universidad Católica del PerúPE, 2014-09-09)We proposed a novel inpainting method where we use a multi-scale approach to speed up the well-known Markov Random Field (MRF) based inpainting method. MRF based inpainting methods are slow when compared with other ... -
Novel Edge-Preserving Filtering Model Based on the Quadratic Envelope of the l0 Gradient Regularization
(Pontificia Universidad Católica del PerúPE, 2023-01-26)In image processing, the l0 gradient regularization (l0-grad) is an inverse problem which penalizes the l0 norm of the reconstructed image’s gradient. Current state-of-the art algorithms for solving this problem are based ... -
Object detection in videos using principal component pursuit and convolutional neural networks
(Pontificia Universidad Católica del PerúPE, 2018-05-03)Object recognition in videos is one of the main challenges in computer vision. Several methods have been proposed to achieve this task, such as background subtraction, temporal differencing, optical flow, particle filtering ... -
Optimal vicinity 2D median filter for fixed-point or floating-point values
(Pontificia Universidad Católica del PerúPE, 2024-06-19)Los filtros medianos son una técnica digital no lineal normalmente usada para remover ruido blanco, ’sal y pimienta’ de imágenes digitales. Consiste en reemplazar el valor de cada pixel por la mediana de los valores ... -
Regularized spectral log difference technique for ultrasonic attenuation imaging
(Pontificia Universidad Católica del PerúPE, 2017-07-13)The attenuation coefficient slope (ACS) has the potential to be used for tissue characterization and as a diagnostic ultrasound tool, hence complementing B-mode images. The ACS can be valuable for estimation of other ... -
Robust Minimmun Variance Beamformer using Phase Aberration Correction Methods
(Pontificia Universidad Católica del PerúPE, 2017-04-28)The minimum variance (MV) beamformer is an adaptive beamforming method that has the potential to enhance the resolution and contrast of ultrasound images. Although the sensitivity of the MV beamformer to steering vector ... -
Separable dictionary learning for convolutional sparse coding via split updates
(Pontificia Universidad Católica del PerúPE, 2019-05-16)The increasing ubiquity of Convolutional Sparse Representation techniques for several image processing tasks (such as object recognition and classification, as well as image denoising) has recently sparked interest in ... -
Soft tissue characterization using different quantitative ultrasound modalities
(Pontificia Universidad Católica del PerúPE, 2019-10-24)Quantitative ultrasound has been used in several modalities for different experiments such as simulated phantom, physical phantoms, ex vivo and in vivo tissues. The potential of the ultrasound techniques could be useful ...