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Journal of Imaging, Volume 6, Issue 2

February 2020 - 3 articles

Cover Story: Block matching is a fundamental tool of searching for blocks (patches) similar to a given query. Generally, a full search (FS) algorithm that exhaustively compares all the pixel intensities of all candidates overlapping each other is the most accurate, but requires vast computation—especially in multichannel images. To address this problem, we propose a three-dimensional orthonormal tree-structured Haar transform assuring the same accuracy as the FS. Using a three-dimensional integral image, the proposed method saves time significantly. This huge saving in computation time can enable new applications of block matching in multichannel images, which were not previously feasible due to the prohibitive computational complexity. View this paper

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Article

61 Citations

11,673 Views

14 Pages

Lung Nodule Detection in CT Images Using Statistical and Shape-Based Features

Noor Khehrah,
Muhammad Shahid Farid,
Saira Bilal and
Muhammad Hassan Khan

J. Imaging2020, 6(2), 6;https://doi.org/10.3390/jimaging6020006

24 February 2020

The lung tumor is among the most detrimental kinds of malignancy. It has a high occurrence rate and a high death rate, as it is frequently diagnosed at the later stages. Computed Tomography (CT) scans are broadly used to distinguish the disease; comp...

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Article

2 Citations

8,390 Views

12 Pages

Unveiling the Secrets of Escher’s Lithographs

Primo Coltelli,
Laura Barsanti and
Paolo Gualtieri

J. Imaging2020, 6(2), 5;https://doi.org/10.3390/jimaging6020005

21 February 2020

An impossible structure gives us the impression of looking at a three-dimensional object, even though this object cannot exist, since it possesses parts that are spatially non-connectable, and are characterized by misleading geometrical properties no...

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Article

1 Citations

4,186 Views

16 Pages

Three-Dimensional Block Matching Using Orthonormal Tree-Structured Haar Transform for Multichannel Images

Izumi Ito and
Aleksandra Pižurica

J. Imaging2020, 6(2), 4;https://doi.org/10.3390/jimaging6020004

11 February 2020

Multichannel images, i.e., images of the same object or scene taken in different spectral bands or with different imaging modalities/settings, are common in many applications. For example, multispectral images contain several wavelength bands and hen...

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