Shock filter-based morphological scheme for texture enhancement

2019 ◽  
Vol 13 (4) ◽  
pp. 653-662
Author(s):  
Niladri Chakraborty ◽  
Priyambada Subudhi ◽  
Susanta Mukhopadhyay
Keyword(s):  
Shock Filter

Despeckling of Sar Images Using Shrinkage of Two-Dimensional Discrete Orthonormal S-Transform

2020 ◽  
pp. 2150023
Author(s):  
Priya R. Kamath ◽  
Kedarnath Senapati ◽  
P. Jidesh
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Relevant Information ◽  
Detection Algorithm ◽  
Two Dimensional ◽  
Sar Images ◽  
S Transform ◽  
Processing Step ◽  
Frequency Components ◽  
Shock Filter

Speckles are inherent to SAR. They hide and undermine several relevant information contained in the SAR images. In this paper, a despeckling algorithm using the shrinkage of two-dimensional discrete orthonormal S-transform (2D-DOST) coefficients in the transform domain along with shock filter is proposed. Also, an attempt has been made as a post-processing step to preserve the edges and other details while removing the speckle. The proposed strategy involves decomposing the SAR image into low and high-frequency components and processing them separately. A shock filter is used to smooth out the small variations in low-frequency components, and the high-frequency components are treated with a shrinkage of 2D-DOST coefficients. The edges, for enhancement, are detected using a ratio-based edge detection algorithm. The proposed method is tested, verified, and compared with some well-known models on C-band and X-band SAR images. A detailed experimental analysis is illustrated.

scholarly journals Detection of follicular regions in actin-stained whole slide images of the human lymph node by shock filter

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Patrick Wurzel ◽  
Jörg Ackermann ◽  
Hendrik Schäfer ◽  
Sonja Scharf ◽  
Martin-Leo Hansmann ◽  
...  
Keyword(s):  
Lymph Node ◽  
B Cells ◽  
Similarity Index ◽  
Morphological Differentiation ◽  
Development Stage ◽  
Immune Defense ◽  
Lymphoid Follicles ◽  
Shock Filter ◽  
Transition Points ◽  
Whole Slide Images

Abstract Human lymph nodes play a central part of immune defense against infection agents and tumor cells. Lymphoid follicles are compartments of the lymph node which are spherical, mainly filled with B cells. B cells are cellular components of the adaptive immune systems. In the course of a specific immune response, lymphoid follicles pass different morphological differentiation stages. The morphology and the spatial distribution of lymphoid follicles can be sometimes associated to a particular causative agent and development stage of a disease. We report our new approach for the automatic detection of follicular regions in histological whole slide images of tissue sections immuno-stained with actin. The method is divided in two phases: (1) shock filter-based detection of transition points and (2) segmentation of follicular regions. Follicular regions in 10 whole slide images were manually annotated by visual inspection, and sample surveys were conducted by an expert pathologist. The results of our method were validated by comparing with the manual annotation. On average, we could achieve a Zijbendos similarity index of 0.71, with a standard deviation of 0.07.

scholarly journals Generation of Maze-Like Scratch Images Using Anisotropic Shock Filter

2007 ◽  
Vol 61 (10) ◽  
pp. 1463-1466
Author(s):  
Chang Jian ◽  
Kohei Inoue ◽  
Kiichi Urahama
Keyword(s):  
Shock Filter

scholarly journals Morphological Sharpening and Denoising Using a Novel Shock Filter Model

2010 ◽  
pp. 19-27 ◽  
Author(s):  
Cosmin Ludusan ◽  
Olivier Lavialle ◽  
Romulus Terebes ◽  
Monica Borda
Keyword(s):  
Filter Model ◽  
Shock Filter

scholarly journals Shock filter coupled with a high-order PDE for additive noise removal and image quality enhancement

Array ◽  
2021 ◽  
pp. 100105
Author(s):  
Simo Thierry ◽  
Welba Colince ◽  
Ntsama Eloundou Pascal ◽  
Noura Alexendre
Keyword(s):  
Image Quality ◽  
Additive Noise ◽  
Noise Removal ◽  
High Order ◽  
Quality Enhancement ◽  
Image Quality Enhancement ◽  
Shock Filter
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