John O'Callaghan

3.8k total citations · 1 hit paper
26 papers, 2.8k citations indexed

About

John O'Callaghan is a scholar working on Computer Vision and Pattern Recognition, Philosophy and Computer Graphics and Computer-Aided Design. According to data from OpenAlex, John O'Callaghan has authored 26 papers receiving a total of 2.8k indexed citations (citations by other indexed papers that have themselves been cited), including 6 papers in Computer Vision and Pattern Recognition, 4 papers in Philosophy and 4 papers in Computer Graphics and Computer-Aided Design. Recurrent topics in John O'Callaghan's work include Medieval Philosophy and Theology (3 papers), Visual perception and processing mechanisms (3 papers) and Hydrology and Watershed Management Studies (3 papers). John O'Callaghan is often cited by papers focused on Medieval Philosophy and Theology (3 papers), Visual perception and processing mechanisms (3 papers) and Hydrology and Watershed Management Studies (3 papers). John O'Callaghan collaborates with scholars based in Australia, United Kingdom and United States. John O'Callaghan's co-authors include David Mark, Philip K. Robertson, Cedric Taylor, J. S. Loveday, Ralph McInerny, R. H. Groves, Valerie J. Hull and M. B. Dale and has published in prestigious journals such as New Phytologist, IEEE Transactions on Geoscience and Remote Sensing and ACM Transactions on Graphics.

In The Last Decade

John O'Callaghan

22 papers receiving 2.5k citations

Hit Papers

The extraction of drainage networks from digital elevatio... 1984 2026 1998 2012 1984 500 1000 1.5k 2.0k
What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

  1. The extraction of drainage networks from digital elevation data
    1984 2.1k citations John O'Callaghan, David Mark Computer Vision Graphics and Image Processing profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
John O'Callaghan Australia 12 1.4k 945 757 670 650 26 2.8k
John Gallant Australia 20 755 0.5× 845 0.9× 1.2k 1.6× 836 1.2× 867 1.3× 58 2.9k
Mark A. Fonstad United States 21 548 0.4× 796 0.8× 1.1k 1.5× 1.4k 2.1× 656 1.0× 42 2.7k
Guoan Tang China 29 729 0.5× 765 0.8× 1.1k 1.4× 692 1.0× 1.3k 2.0× 275 3.3k
David C. Mason United Kingdom 34 1.1k 0.8× 2.1k 2.2× 1.1k 1.5× 1.1k 1.6× 242 0.4× 77 3.9k
Paola Passalacqua United States 30 1.0k 0.7× 1.4k 1.4× 666 0.9× 1.8k 2.6× 678 1.0× 104 3.3k
Garnett P. Williams United States 17 1.4k 1.0× 725 0.8× 217 0.3× 2.4k 3.6× 1.7k 2.6× 25 3.7k
Jaroslav Hofierka Slovakia 17 491 0.3× 592 0.6× 927 1.2× 452 0.7× 681 1.0× 44 2.4k
Frank Canters Belgium 31 306 0.2× 1.6k 1.7× 974 1.3× 644 1.0× 261 0.4× 144 3.1k
Hyongki Lee United States 33 1.2k 0.8× 1.7k 1.8× 717 0.9× 456 0.7× 163 0.3× 105 3.2k
A. Ramachandra Rao United States 19 1.5k 1.0× 3.0k 3.2× 821 1.1× 415 0.6× 185 0.3× 71 4.2k

Countries citing papers authored by John O'Callaghan

Since Specialization
Citations

This map shows the geographic impact of John O'Callaghan's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by John O'Callaghan with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites John O'Callaghan more than expected).

Fields of papers citing papers by John O'Callaghan

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John O'Callaghan. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by John O'Callaghan. The network helps show where John O'Callaghan may publish in the future.

Co-authorship network of co-authors of John O'Callaghan

This figure shows the co-authorship network connecting the top 25 collaborators of John O'Callaghan. A scholar is included among the top collaborators of John O'Callaghan based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with John O'Callaghan. John O'Callaghan is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
O'Callaghan, John. (2015). The Immaterial Soul and Its Discontents. 24(1). 43–66. 1 indexed citations
2.
O'Callaghan, John, et al.. (2012). Narratives of the occluded Irish diaspora : subversive voices. Peter Lang eBooks. 1 indexed citations
3.
O'Callaghan, John. (2008). The Plurality of Forms: Now and Then. ˜The œreview of metaphysics. 62(1). 3. 2 indexed citations
4.
O'Callaghan, John. (2004). Thomas Aquinas on Human Nature: A Philosophical Study of Summa Theologiae Ia, 75-89 (review). Journal of the history of philosophy. 42(1). 99–100. 1 indexed citations
5.
O'Callaghan, John. (2001). The Threefold Cord: Mind, Body, and World. ˜The œreview of metaphysics. 54(3). 129 indexed citations
6.
Robertson, Philip K. & John O'Callaghan. (1988). The application of perceptual color spaces to the display of remotely sensed imagery. IEEE Transactions on Geoscience and Remote Sensing. 26(1). 49–59. 31 indexed citations
7.
Robertson, Philip K. & John O'Callaghan. (1987). Colour graphics and three-dimensional scene synthesis in image display. Computers & Graphics. 11(4). 469–473. 3 indexed citations
8.
Robertson, Philip K. & John O'Callaghan. (1986). The Generation of Color Sequences for Univariate and Bivariate Mapping. IEEE Computer Graphics and Applications. 6(2). 24–32. 86 indexed citations
9.
O'Callaghan, John & David Mark. (1984). The extraction of drainage networks from digital elevation data. Computer Vision Graphics and Image Processing. 28(3). 323–344. 2136 indexed citations breakdown →
10.
O'Callaghan, John. (1984). The extraction of drainage networks from digital elevation data : Computer Vision. Medical Entomology and Zoology. 28. 29 indexed citations
11.
O'Callaghan, John, et al.. (1980). Formal description of computational structure in aids. 127(2). 55–63. 2 indexed citations
12.
O'Callaghan, John, et al.. (1980). Formal description of computational structure in aids. IEE Proceedings E Computers and Digital Techniques. 127(2). 55–55. 2 indexed citations
13.
O'Callaghan, John. (1976). A Method for Representing Point Data by Regions.. Australian Computer Journal. 8. 7–12. 1 indexed citations
14.
O'Callaghan, John. (1974). Human Perception of Homogeneous Dot Patterns. Perception. 3(1). 33–45. 14 indexed citations
15.
O'Callaghan, John & J. S. Loveday. (1973). Quantitative measurement of soil cracking patterns. Pattern Recognition. 5(2). 83–98. 25 indexed citations
16.
Taylor, Cedric & John O'Callaghan. (1972). A Numerical Solution of the Elastohydrodynamic Lubrication Problem Using Finite Elements. Journal of Mechanical Engineering Science. 14(4). 229–237. 42 indexed citations
17.
O'Callaghan, John. (1971). Graphical Communication in Interactive Computer Graphics.. Australian Computer Journal. 3(3). 12–19. 1 indexed citations
18.
Dale, M. B., R. H. Groves, Valerie J. Hull, & John O'Callaghan. (1971). A NEW METHOD FOR DESCRIBING LEAF SHAPE. New Phytologist. 70(2). 437–442. 5 indexed citations
19.
O'Callaghan, John. (1970). An interactive system for leaf shape measurement. International Journal of Man-Machine Studies. 2(1). 29–39. 2 indexed citations
20.
O'Callaghan, John. (1970). A coding approach to pattern recognition. Pattern Recognition. 2(3). 199–214. 4 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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