Generation of Maze-Like Scratch Images Using Anisotropic Shock Filter

Chang Jian; Kohei Inoue; Kiichi Urahama

doi:10.3169/itej.61.1463

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

International Journal of Image and Graphics ◽

10.1142/s0219467821500236 ◽

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.

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

Biological Chemistry ◽

10.1515/hsz-2020-0178 ◽

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.

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